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Folio changes for 5.18 

- Rewrite how munlock works to massively reduce the contention
    on i_mmap_rwsem (Hugh Dickins):
    https://lore.kernel.org/linux-mm/8e4356d-9622-a7f0-b2c-f116b5f2efea@google.com/
  - Sort out the page refcount mess for ZONE_DEVICE pages (Christoph Hellwig):
    https://lore.kernel.org/linux-mm/20220210072828.2930359-1-hch@lst.de/
  - Convert GUP to use folios and make pincount available for order-1
    pages. (Matthew Wilcox)
  - Convert a few more truncation functions to use folios (Matthew Wilcox)
  - Convert page_vma_mapped_walk to use PFNs instead of pages (Matthew Wilcox)
  - Convert rmap_walk to use folios (Matthew Wilcox)
  - Convert most of shrink_page_list() to use a folio (Matthew Wilcox)
  - Add support for creating large folios in readahead (Matthew Wilcox)
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Merge tag 'folio-5.18c' of git://git.infradead.org/users/willy/pagecache

Pull folio updates from Matthew Wilcox:

 - Rewrite how munlock works to massively reduce the contention on
   i_mmap_rwsem (Hugh Dickins):

     https://lore.kernel.org/linux-mm/8e4356d-9622-a7f0-b2c-f116b5f2efea@google.com/

 - Sort out the page refcount mess for ZONE_DEVICE pages (Christoph
   Hellwig):

     https://lore.kernel.org/linux-mm/20220210072828.2930359-1-hch@lst.de/

 - Convert GUP to use folios and make pincount available for order-1
   pages. (Matthew Wilcox)

 - Convert a few more truncation functions to use folios (Matthew
   Wilcox)

 - Convert page_vma_mapped_walk to use PFNs instead of pages (Matthew
   Wilcox)

 - Convert rmap_walk to use folios (Matthew Wilcox)

 - Convert most of shrink_page_list() to use a folio (Matthew Wilcox)

 - Add support for creating large folios in readahead (Matthew Wilcox)

* tag 'folio-5.18c' of git://git.infradead.org/users/willy/pagecache: (114 commits)
  mm/damon: minor cleanup for damon_pa_young
  selftests/vm/transhuge-stress: Support file-backed PMD folios
  mm/filemap: Support VM_HUGEPAGE for file mappings
  mm/readahead: Switch to page_cache_ra_order
  mm/readahead: Align file mappings for non-DAX
  mm/readahead: Add large folio readahead
  mm: Support arbitrary THP sizes
  mm: Make large folios depend on THP
  mm: Fix READ_ONLY_THP warning
  mm/filemap: Allow large folios to be added to the page cache
  mm: Turn can_split_huge_page() into can_split_folio()
  mm/vmscan: Convert pageout() to take a folio
  mm/vmscan: Turn page_check_references() into folio_check_references()
  mm/vmscan: Account large folios correctly
  mm/vmscan: Optimise shrink_page_list for non-PMD-sized folios
  mm/vmscan: Free non-shmem folios without splitting them
  mm/rmap: Constify the rmap_walk_control argument
  mm/rmap: Convert rmap_walk() to take a folio
  mm: Turn page_anon_vma() into folio_anon_vma()
  mm/rmap: Turn page_lock_anon_vma_read() into folio_lock_anon_vma_read()
  ...
This commit is contained in:
Linus Torvalds 2022-03-22 17:03:12 -07:00
parent 3bf03b9a08 2a3c4bce3e
commit 9030fb0bb9
100 changed files with 2924 additions and 3044 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
Documentation/core-api/pin_user_pages.rst
View File

@ -55,18 +55,18 @@ flags the caller provides. The caller is required to pass in a non-null struct
pages* array, and the function then pins pages by incrementing each by a special
value: GUP_PIN_COUNTING_BIAS.
For huge pages (and in fact, any compound page of more than 2 pages), the
GUP_PIN_COUNTING_BIAS scheme is not used. Instead, an exact form of pin counting
is achieved, by using the 3rd struct page in the compound page. A new struct
page field, hpage_pinned_refcount, has been added in order to support this.
For compound pages, the GUP_PIN_COUNTING_BIAS scheme is not used. Instead,
an exact form of pin counting is achieved, by using the 2nd struct page
in the compound page. A new struct page field, compound_pincount, has
been added in order to support this.
This approach for compound pages avoids the counting upper limit problems that
are discussed below. Those limitations would have been aggravated severely by
huge pages, because each tail page adds a refcount to the head page. And in
fact, testing revealed that, without a separate hpage_pinned_refcount field,
fact, testing revealed that, without a separate compound_pincount field,
page overflows were seen in some huge page stress tests.
This also means that huge pages and compound pages (of order > 1) do not suffer
This also means that huge pages and compound pages do not suffer
from the false positives problem that is mentioned below.::
Function
@ -264,9 +264,9 @@ place.)
Other diagnostics
=================
dump_page() has been enhanced slightly, to handle these new counting fields, and
to better report on compound pages in general. Specifically, for compound pages
with order > 1, the exact (hpage_pinned_refcount) pincount is reported.
dump_page() has been enhanced slightly, to handle these new counting
fields, and to better report on compound pages in general. Specifically,
for compound pages, the exact (compound_pincount) pincount is reported.
References
==========

1
arch/alpha/include/asm/pgtable.h
View File

@ -233,6 +233,7 @@ pmd_page_vaddr(pmd_t pmd)
return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET;
}
#define pmd_pfn(pmd) (pmd_val(pmd) >> 32)
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> 32))
#define pud_page(pud) (pfn_to_page(pud_val(pud) >> 32))

1
arch/arc/include/asm/hugepage.h
View File

@ -31,7 +31,6 @@ static inline pmd_t pte_pmd(pte_t pte)
#define pmd_write(pmd) pte_write(pmd_pte(pmd))
#define pmd_young(pmd) pte_young(pmd_pte(pmd))
#define pmd_pfn(pmd) pte_pfn(pmd_pte(pmd))
#define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
#define mk_pmd(page, prot) pte_pmd(mk_pte(page, prot))

1
arch/arc/include/asm/pgtable-levels.h
View File

@ -161,6 +161,7 @@
#define pmd_present(x) (pmd_val(x))
#define pmd_clear(xp) do { pmd_val(*(xp)) = 0; } while (0)
#define pmd_page_vaddr(pmd) (pmd_val(pmd) & PAGE_MASK)
#define pmd_pfn(pmd) ((pmd_val(pmd) & PAGE_MASK) >> PAGE_SHIFT)
#define pmd_page(pmd) virt_to_page(pmd_page_vaddr(pmd))
#define set_pmd(pmdp, pmd) (*(pmdp) = pmd)
#define pmd_pgtable(pmd) ((pgtable_t) pmd_page_vaddr(pmd))

2
arch/arm/include/asm/pgtable-2level.h
View File

@ -208,6 +208,8 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
}
#define pmd_offset pmd_offset
#define pmd_pfn(pmd) (__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
#define pmd_large(pmd) (pmd_val(pmd) & 2)
#define pmd_leaf(pmd) (pmd_val(pmd) & 2)
#define pmd_bad(pmd) (pmd_val(pmd) & 2)

1
arch/arm64/mm/mmu.c
View File

@ -17,6 +17,7 @@
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/memblock.h>
#include <linux/memremap.h>
#include <linux/memory.h>
#include <linux/fs.h>
#include <linux/io.h>

1
arch/csky/include/asm/pgtable.h
View File

@ -30,6 +30,7 @@
#define pgd_ERROR(e) \
pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
#define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#define pte_clear(mm, addr, ptep) set_pte((ptep), \
(((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))

5
arch/hexagon/include/asm/pgtable.h
View File

@ -235,6 +235,11 @@ static inline int pmd_bad(pmd_t pmd)
return 0;
}
/*
* pmd_pfn - converts a PMD entry to a page frame number
*/
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
/*
* pmd_page - converts a PMD entry to a page pointer
*/

1
arch/ia64/include/asm/pgtable.h
View File

@ -267,6 +267,7 @@ ia64_phys_addr_valid (unsigned long addr)
#define pmd_present(pmd) (pmd_val(pmd) != 0UL)
#define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0UL)
#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & _PFN_MASK))
#define pmd_pfn(pmd) ((pmd_val(pmd) & _PFN_MASK) >> PAGE_SHIFT)
#define pmd_page(pmd) virt_to_page((pmd_val(pmd) + PAGE_OFFSET))
#define pud_none(pud) (!pud_val(pud))

1
arch/m68k/include/asm/mcf_pgtable.h
View File

@ -322,6 +322,7 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) (__pte((x).val))
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))

1
arch/m68k/include/asm/motorola_pgtable.h
View File

@ -147,6 +147,7 @@ static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
#define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE)
#define pmd_clear(pmdp) ({ pmd_val(*pmdp) = 0; })
#define pmd_pfn(pmd) ((pmd_val(pmd) & _TABLE_MASK) >> PAGE_SHIFT)
/*
* m68k does not have huge pages (020/030 actually could), but generic code
* expects pmd_page() to exists, only to then DCE it all. Provide a dummy to

1
arch/m68k/include/asm/sun3_pgtable.h
View File

@ -130,6 +130,7 @@ static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *p
({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
#define pte_page(pte) virt_to_page(__pte_page(pte))
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) virt_to_page(pmd_page_vaddr(pmd))

3
arch/microblaze/include/asm/pgtable.h
View File

@ -399,6 +399,9 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
return ((unsigned long) (pmd_val(pmd) & PAGE_MASK));
}
/* returns pfn of the pmd entry*/
#define pmd_pfn(pmd) (__pa(pmd_val(pmd)) >> PAGE_SHIFT)
/* returns struct *page of the pmd entry*/
#define pmd_page(pmd) (pfn_to_page(__pa(pmd_val(pmd)) >> PAGE_SHIFT))

10
arch/mips/include/asm/pgtable.h
View File

@ -86,6 +86,11 @@ extern void paging_init(void);
*/
#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
static inline unsigned long pmd_pfn(pmd_t pmd)
{
return pmd_val(pmd) >> _PFN_SHIFT;
}
#ifndef CONFIG_MIPS_HUGE_TLB_SUPPORT
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
@ -422,11 +427,6 @@ static inline int pmd_write(pmd_t pmd)
return !!(pmd_val(pmd) & _PAGE_WRITE);
}
static inline unsigned long pmd_pfn(pmd_t pmd)
{
return pmd_val(pmd) >> _PFN_SHIFT;
}
static inline struct page *pmd_page(pmd_t pmd)
{
if (pmd_val(pmd) & _PAGE_HUGE)

1
arch/nds32/include/asm/pgtable.h
View File

@ -308,6 +308,7 @@ static inline pmd_t __mk_pmd(pte_t * ptep, unsigned long prot)
return pmd;
}
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) virt_to_page(__va(pmd_val(pmd)))
/*

1
arch/nios2/include/asm/pgtable.h
View File

@ -235,6 +235,7 @@ static inline void pte_clear(struct mm_struct *mm,
* and a page entry and page directory to the page they refer to.
*/
#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
#define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
static inline unsigned long pmd_page_vaddr(pmd_t pmd)

1
arch/openrisc/include/asm/pgtable.h
View File

@ -361,6 +361,7 @@ static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
pmd_val(*pmdp) = _KERNPG_TABLE | (unsigned long) ptep;
}
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
static inline unsigned long pmd_page_vaddr(pmd_t pmd)

1
arch/parisc/include/asm/pgtable.h
View File

@ -408,6 +408,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
return ((unsigned long) __va(pmd_address(pmd)));
}
#define pmd_pfn(pmd) (pmd_address(pmd) >> PAGE_SHIFT)
#define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd)))
#define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))

4
arch/powerpc/include/asm/book3s/32/pgtable.h
View File

@ -372,8 +372,8 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
#define __HAVE_ARCH_PTE_SAME
#define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0)
#define pmd_page(pmd) \
pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
/*
* Encode and decode a swap entry.

1
arch/powerpc/include/asm/mmu_context.h
View File

@ -21,7 +21,6 @@ extern void destroy_context(struct mm_struct *mm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
struct mm_iommu_table_group_mem_t;
extern int isolate_lru_page(struct page *page); /* from internal.h */
extern bool mm_iommu_preregistered(struct mm_struct *mm);
extern long mm_iommu_new(struct mm_struct *mm,
unsigned long ua, unsigned long entries,

7
arch/powerpc/include/asm/nohash/32/pgtable.h
View File

@ -349,15 +349,14 @@ static inline int pte_young(pte_t pte)
* of the pte page. -- paulus
*/
#ifndef CONFIG_BOOKE
#define pmd_page(pmd) \
pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#else
#define pmd_page_vaddr(pmd) \
((unsigned long)(pmd_val(pmd) & ~(PTE_TABLE_SIZE - 1)))
#define pmd_page(pmd) \
pfn_to_page((__pa(pmd_val(pmd)) >> PAGE_SHIFT))
#define pmd_pfn(pmd) (__pa(pmd_val(pmd)) >> PAGE_SHIFT)
#endif
#define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
/*
* Encode and decode a swap entry.
* Note that the bits we use in a PTE for representing a swap entry

1
arch/powerpc/include/asm/nohash/64/pgtable.h
View File

@ -142,6 +142,7 @@ static inline pte_t pmd_pte(pmd_t pmd)
#define pmd_present(pmd) (!pmd_none(pmd))
#define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
extern struct page *pmd_page(pmd_t pmd);
#define pmd_pfn(pmd) (page_to_pfn(pmd_page(pmd)))
static inline void pud_set(pud_t *pudp, unsigned long val)
{

2
arch/powerpc/kvm/book3s_hv_uvmem.c
View File

@ -91,6 +91,7 @@
#include <linux/kvm_host.h>
#include <linux/ksm.h>
#include <linux/of.h>
#include <linux/memremap.h>
#include <asm/ultravisor.h>
#include <asm/mman.h>
#include <asm/kvm_ppc.h>
@ -712,7 +713,6 @@ static struct page *kvmppc_uvmem_get_page(unsigned long gpa, struct kvm *kvm)
dpage = pfn_to_page(uvmem_pfn);
dpage->zone_device_data = pvt;
get_page(dpage);
lock_page(dpage);
return dpage;
out_clear:

1
arch/powerpc/mm/book3s64/pgtable.c
View File

@ -6,6 +6,7 @@
#include <linux/sched.h>
#include <linux/mm_types.h>
#include <linux/memblock.h>
#include <linux/memremap.h>
#include <linux/debugfs.h>
#include <misc/cxl-base.h>

1
arch/sh/include/asm/pgtable_32.h
View File

@ -406,6 +406,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
return (unsigned long)pmd_val(pmd);
}
#define pmd_pfn(pmd) (__pa(pmd_val(pmd)) >> PAGE_SHIFT)
#define pmd_page(pmd) (virt_to_page(pmd_val(pmd)))
#ifdef CONFIG_X2TLB

7
arch/sparc/include/asm/pgtable_32.h
View File

@ -127,11 +127,16 @@ static inline int srmmu_device_memory(unsigned long x)
return ((x & 0xF0000000) != 0);
}
static inline unsigned long pmd_pfn(pmd_t pmd)
{
return (pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4);
}
static inline struct page *pmd_page(pmd_t pmd)
{
if (srmmu_device_memory(pmd_val(pmd)))
BUG();
return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
return pfn_to_page(pmd_pfn(pmd));
}
static inline unsigned long __pmd_page(pmd_t pmd)

1
arch/um/include/asm/pgtable.h
View File

@ -109,6 +109,7 @@ extern unsigned long end_iomem;
#define p4d_newpage(x) (p4d_val(x) & _PAGE_NEWPAGE)
#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEWPAGE)
#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
#define pte_page(x) pfn_to_page(pte_pfn(x))

1
arch/xtensa/include/asm/pgtable.h
View File

@ -241,6 +241,7 @@ static inline void paging_init(void) { }
* The pmd contains the kernel virtual address of the pte page.
*/
#define pmd_page_vaddr(pmd) ((unsigned long)(pmd_val(pmd) & PAGE_MASK))
#define pmd_pfn(pmd) (__pa(pmd_val(pmd)) >> PAGE_SHIFT)
#define pmd_page(pmd) virt_to_page(pmd_val(pmd))
/*

1
drivers/block/xen-blkback/xenbus.c
View File

@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/pagemap.h>
#include <xen/events.h>
#include <xen/grant_table.h>
#include "common.h"

2
drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
View File

@ -24,6 +24,7 @@
#include <linux/hmm.h>
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
#include <linux/migrate.h>
#include "amdgpu_sync.h"
#include "amdgpu_object.h"
#include "amdgpu_vm.h"
@ -224,7 +225,6 @@ svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn)
page = pfn_to_page(pfn);
svm_range_bo_ref(prange->svm_bo);
page->zone_device_data = prange->svm_bo;
get_page(page);
lock_page(page);
}

1
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
View File

@ -25,6 +25,7 @@
#include <linux/hashtable.h>
#include <linux/mmu_notifier.h>
#include <linux/memremap.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/atomic.h>

2
drivers/gpu/drm/drm_cache.c
View File

@ -27,11 +27,11 @@
/*
* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
#include <linux/dma-buf-map.h>
#include <linux/export.h>
#include <linux/highmem.h>
#include <linux/cc_platform.h>
#include <linux/ioport.h>
#include <xen/xen.h>
#include <drm/drm_cache.h>

3
drivers/gpu/drm/nouveau/nouveau_dmem.c
View File

@ -39,6 +39,8 @@
#include <linux/sched/mm.h>
#include <linux/hmm.h>
#include <linux/memremap.h>
#include <linux/migrate.h>
/*
* FIXME: this is ugly right now we are using TTM to allocate vram and we pin
@ -324,7 +326,6 @@ nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm)
return NULL;
}
get_page(page);
lock_page(page);
return page;
}

1
drivers/gpu/drm/nouveau/nouveau_svm.c
View File

@ -35,6 +35,7 @@
#include <linux/sched/mm.h>
#include <linux/sort.h>
#include <linux/hmm.h>
#include <linux/memremap.h>
#include <linux/rmap.h>
struct nouveau_svm {

1
drivers/infiniband/core/rw.c
View File

@ -2,6 +2,7 @@
/*
* Copyright (c) 2016 HGST, a Western Digital Company.
*/
#include <linux/memremap.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/pci-p2pdma.h>

1
drivers/nvdimm/pmem.h
View File

@ -3,6 +3,7 @@
#define __NVDIMM_PMEM_H__
#include <linux/page-flags.h>
#include <linux/badblocks.h>
#include <linux/memremap.h>
#include <linux/types.h>
#include <linux/pfn_t.h>
#include <linux/fs.h>

1
drivers/nvme/host/pci.c
View File

@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/memremap.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex.h>

1
drivers/nvme/target/io-cmd-bdev.c
View File

@ -6,6 +6,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/blkdev.h>
#include <linux/blk-integrity.h>
#include <linux/memremap.h>
#include <linux/module.h>
#include "nvmet.h"

1
drivers/usb/gadget/function/f_mass_storage.c
View File

@ -179,6 +179,7 @@
#include <linux/kthread.h>
#include <linux/sched/signal.h>
#include <linux/limits.h>
#include <linux/pagemap.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

2
fs/Kconfig
View File

@ -48,7 +48,7 @@ config FS_DAX
bool "File system based Direct Access (DAX) support"
depends on MMU
depends on !(ARM || MIPS || SPARC)
select DEV_PAGEMAP_OPS if (ZONE_DEVICE && !FS_DAX_LIMITED)
depends on ZONE_DEVICE || FS_DAX_LIMITED
select FS_IOMAP
select DAX
help

1
fs/coda/file.c
View File

@ -14,6 +14,7 @@
#include <linux/time.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/cred.h>
#include <linux/errno.h>

1
fs/fuse/virtio_fs.c
View File

@ -8,6 +8,7 @@
#include <linux/dax.h>
#include <linux/pci.h>
#include <linux/pfn_t.h>
#include <linux/memremap.h>
#include <linux/module.h>
#include <linux/virtio.h>
#include <linux/virtio_fs.h>

1
fs/iomap/fiemap.c
View File

@ -7,6 +7,7 @@
#include <linux/fs.h>
#include <linux/iomap.h>
#include <linux/fiemap.h>
#include <linux/pagemap.h>
static int iomap_to_fiemap(struct fiemap_extent_info *fi,
const struct iomap *iomap, u32 flags)

1
fs/nfsd/filecache.c
View File

@ -7,6 +7,7 @@
#include <linux/hash.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/list_lru.h>
#include <linux/fsnotify_backend.h>

1
fs/nfsd/vfs.c
View File

@ -26,6 +26,7 @@
#include <linux/xattr.h>
#include <linux/jhash.h>
#include <linux/ima.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/exportfs.h>

1
fs/proc/page.c
View File

@ -10,6 +10,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
#include <linux/memremap.h>
#include <linux/memcontrol.h>
#include <linux/mmu_notifier.h>
#include <linux/page_idle.h>

24
fs/splice.c
View File

@ -46,45 +46,45 @@
static bool page_cache_pipe_buf_try_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
struct page *page = buf->page;
struct folio *folio = page_folio(buf->page);
struct address_space *mapping;
lock_page(page);
folio_lock(folio);
mapping = page_mapping(page);
mapping = folio_mapping(folio);
if (mapping) {
WARN_ON(!PageUptodate(page));
WARN_ON(!folio_test_uptodate(folio));
/*
* At least for ext2 with nobh option, we need to wait on
* writeback completing on this page, since we'll remove it
* writeback completing on this folio, since we'll remove it
* from the pagecache. Otherwise truncate wont wait on the
* page, allowing the disk blocks to be reused by someone else
* folio, allowing the disk blocks to be reused by someone else
* before we actually wrote our data to them. fs corruption
* ensues.
*/
wait_on_page_writeback(page);
folio_wait_writeback(folio);
if (page_has_private(page) &&
!try_to_release_page(page, GFP_KERNEL))
if (folio_has_private(folio) &&
!filemap_release_folio(folio, GFP_KERNEL))
goto out_unlock;
/*
* If we succeeded in removing the mapping, set LRU flag
* and return good.
*/
if (remove_mapping(mapping, page)) {
if (remove_mapping(mapping, folio)) {
buf->flags |= PIPE_BUF_FLAG_LRU;
return true;
}
}
/*
* Raced with truncate or failed to remove page from current
* Raced with truncate or failed to remove folio from current
* address space, unlock and return failure.
*/
out_unlock:
unlock_page(page);
folio_unlock(folio);
return false;
}

1
fs/vboxsf/utils.c
View File

@ -9,6 +9,7 @@
#include <linux/namei.h>
#include <linux/nls.h>
#include <linux/sizes.h>
#include <linux/pagemap.h>
#include <linux/vfs.h>
#include "vfsmod.h"

120
include/linux/fs.h
View File

@ -2753,54 +2753,6 @@ extern void init_special_inode(struct inode *, umode_t, dev_t);
extern void make_bad_inode(struct inode *);
extern bool is_bad_inode(struct inode *);
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end);
void invalidate_mapping_pagevec(struct address_space *mapping,
pgoff_t start, pgoff_t end,
unsigned long *nr_pagevec);
static inline void invalidate_remote_inode(struct inode *inode)
{
if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode))
invalidate_mapping_pages(inode->i_mapping, 0, -1);
}
extern int invalidate_inode_pages2(struct address_space *mapping);
extern int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
extern int filemap_fdatawait_keep_errors(struct address_space *mapping);
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
loff_t lend);
extern int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
loff_t start_byte, loff_t end_byte);
static inline int filemap_fdatawait(struct address_space *mapping)
{
return filemap_fdatawait_range(mapping, 0, LLONG_MAX);
}
extern bool filemap_range_has_page(struct address_space *, loff_t lstart,
loff_t lend);
extern int filemap_write_and_wait_range(struct address_space *mapping,
loff_t lstart, loff_t lend);
extern int __filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end, int sync_mode);
extern int filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end);
extern int filemap_check_errors(struct address_space *mapping);
extern void __filemap_set_wb_err(struct address_space *mapping, int err);
int filemap_fdatawrite_wbc(struct address_space *mapping,
struct writeback_control *wbc);
static inline int filemap_write_and_wait(struct address_space *mapping)
{
return filemap_write_and_wait_range(mapping, 0, LLONG_MAX);
}
extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
loff_t lend);
extern int __must_check file_check_and_advance_wb_err(struct file *file);
@ -2812,67 +2764,6 @@ static inline int file_write_and_wait(struct file *file)
return file_write_and_wait_range(file, 0, LLONG_MAX);
}
/**
* filemap_set_wb_err - set a writeback error on an address_space
* @mapping: mapping in which to set writeback error
* @err: error to be set in mapping
*
* When writeback fails in some way, we must record that error so that
* userspace can be informed when fsync and the like are called. We endeavor
* to report errors on any file that was open at the time of the error. Some
* internal callers also need to know when writeback errors have occurred.
*
* When a writeback error occurs, most filesystems will want to call
* filemap_set_wb_err to record the error in the mapping so that it will be
* automatically reported whenever fsync is called on the file.
*/
static inline void filemap_set_wb_err(struct address_space *mapping, int err)
{
/* Fastpath for common case of no error */
if (unlikely(err))
__filemap_set_wb_err(mapping, err);
}
/**
* filemap_check_wb_err - has an error occurred since the mark was sampled?
* @mapping: mapping to check for writeback errors
* @since: previously-sampled errseq_t
*
* Grab the errseq_t value from the mapping, and see if it has changed "since"
* the given value was sampled.
*
* If it has then report the latest error set, otherwise return 0.
*/
static inline int filemap_check_wb_err(struct address_space *mapping,
errseq_t since)
{
return errseq_check(&mapping->wb_err, since);
}
/**
* filemap_sample_wb_err - sample the current errseq_t to test for later errors
* @mapping: mapping to be sampled
*
* Writeback errors are always reported relative to a particular sample point
* in the past. This function provides those sample points.
*/
static inline errseq_t filemap_sample_wb_err(struct address_space *mapping)
{
return errseq_sample(&mapping->wb_err);
}
/**
* file_sample_sb_err - sample the current errseq_t to test for later errors
* @file: file pointer to be sampled
*
* Grab the most current superblock-level errseq_t value for the given
* struct file.
*/
static inline errseq_t file_sample_sb_err(struct file *file)
{
return errseq_sample(&file->f_path.dentry->d_sb->s_wb_err);
}
extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
int datasync);
extern int vfs_fsync(struct file *file, int datasync);
@ -3627,15 +3518,4 @@ extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len,
extern int generic_fadvise(struct file *file, loff_t offset, loff_t len,
int advice);
/*
* Flush file data before changing attributes. Caller must hold any locks
* required to prevent further writes to this file until we're done setting
* flags.
*/
static inline int inode_drain_writes(struct inode *inode)
{
inode_dio_wait(inode);
return filemap_write_and_wait(inode->i_mapping);
}
#endif /* _LINUX_FS_H */

9
include/linux/hmm.h
View File

@ -9,14 +9,9 @@
#ifndef LINUX_HMM_H
#define LINUX_HMM_H
#include <linux/kconfig.h>
#include <linux/pgtable.h>
#include <linux/mm.h>
#include <linux/device.h>
#include <linux/migrate.h>
#include <linux/memremap.h>
#include <linux/completion.h>
#include <linux/mmu_notifier.h>
struct mmu_interval_notifier;
/*
* On output:

59
include/linux/huge_mm.h
View File

@ -185,7 +185,7 @@ void prep_transhuge_page(struct page *page);
void free_transhuge_page(struct page *page);
bool is_transparent_hugepage(struct page *page);
bool can_split_huge_page(struct page *page, int *pextra_pins);
bool can_split_folio(struct folio *folio, int *pextra_pins);
int split_huge_page_to_list(struct page *page, struct list_head *list);
static inline int split_huge_page(struct page *page)
{
@ -194,7 +194,7 @@ static inline int split_huge_page(struct page *page)
void deferred_split_huge_page(struct page *page);
void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long address, bool freeze, struct page *page);
unsigned long address, bool freeze, struct folio *folio);
#define split_huge_pmd(__vma, __pmd, __address) \
do { \
@ -207,7 +207,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
bool freeze, struct page *page);
bool freeze, struct folio *folio);
void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
unsigned long address);
@ -250,30 +250,6 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
return NULL;
}
/**
* thp_order - Order of a transparent huge page.
* @page: Head page of a transparent huge page.
*/
static inline unsigned int thp_order(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
if (PageHead(page))
return HPAGE_PMD_ORDER;
return 0;
}
/**
* thp_nr_pages - The number of regular pages in this huge page.
* @page: The head page of a huge page.
*/
static inline int thp_nr_pages(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
if (PageHead(page))
return HPAGE_PMD_NR;
return 1;
}
/**
* folio_test_pmd_mappable - Can we map this folio with a PMD?
* @folio: The folio to test
@ -336,18 +312,6 @@ static inline struct list_head *page_deferred_list(struct page *page)
#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
static inline unsigned int thp_order(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
return 0;
}
static inline int thp_nr_pages(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
return 1;
}
static inline bool folio_test_pmd_mappable(struct folio *folio)
{
return false;
@ -387,7 +351,7 @@ static inline bool is_transparent_hugepage(struct page *page)
#define thp_get_unmapped_area NULL
static inline bool
can_split_huge_page(struct page *page, int *pextra_pins)
can_split_folio(struct folio *folio, int *pextra_pins)
{
BUILD_BUG();
return false;
@ -406,9 +370,9 @@ static inline void deferred_split_huge_page(struct page *page) {}
do { } while (0)
static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long address, bool freeze, struct page *page) {}
unsigned long address, bool freeze, struct folio *folio) {}
static inline void split_huge_pmd_address(struct vm_area_struct *vma,
unsigned long address, bool freeze, struct page *page) {}
unsigned long address, bool freeze, struct folio *folio) {}
#define split_huge_pud(__vma, __pmd, __address) \
do { } while (0)
@ -483,15 +447,10 @@ static inline bool thp_migration_supported(void)
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
/**
* thp_size - Size of a transparent huge page.
* @page: Head page of a transparent huge page.
*
* Return: Number of bytes in this page.
*/
static inline unsigned long thp_size(struct page *page)
static inline int split_folio_to_list(struct folio *folio,
struct list_head *list)
{
return PAGE_SIZE << thp_order(page);
return split_huge_page_to_list(&folio->page, list);
}
#endif /* _LINUX_HUGE_MM_H */

5
include/linux/hugetlb.h
View File

@ -970,6 +970,11 @@ static inline struct hstate *page_hstate(struct page *page)
return NULL;
}
static inline struct hstate *size_to_hstate(unsigned long size)
{
return NULL;
}
static inline unsigned long huge_page_size(struct hstate *h)
{
return PAGE_SIZE;

6
include/linux/ksm.h
View File

@ -51,7 +51,7 @@ static inline void ksm_exit(struct mm_struct *mm)
struct page *ksm_might_need_to_copy(struct page *page,
struct vm_area_struct *vma, unsigned long address);
void rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc);
void rmap_walk_ksm(struct folio *folio, const struct rmap_walk_control *rwc);
void folio_migrate_ksm(struct folio *newfolio, struct folio *folio);
#else /* !CONFIG_KSM */
@ -78,8 +78,8 @@ static inline struct page *ksm_might_need_to_copy(struct page *page,
return page;
}
static inline void rmap_walk_ksm(struct page *page,
struct rmap_walk_control *rwc)
static inline void rmap_walk_ksm(struct folio *folio,
const struct rmap_walk_control *rwc)
{
}

27
include/linux/memremap.h
View File

@ -1,6 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MEMREMAP_H_
#define _LINUX_MEMREMAP_H_
#include <linux/mm.h>
#include <linux/range.h>
#include <linux/ioport.h>
#include <linux/percpu-refcount.h>
@ -66,9 +68,9 @@ enum memory_type {
struct dev_pagemap_ops {
/*
* Called once the page refcount reaches 1. (ZONE_DEVICE pages never
* reach 0 refcount unless there is a refcount bug. This allows the
* device driver to implement its own memory management.)
* Called once the page refcount reaches 0. The reference count will be
* reset to one by the core code after the method is called to prepare
* for handing out the page again.
*/
void (*page_free)(struct page *page);
@ -129,6 +131,25 @@ static inline unsigned long pgmap_vmemmap_nr(struct dev_pagemap *pgmap)
return 1 << pgmap->vmemmap_shift;
}
static inline bool is_device_private_page(const struct page *page)
{
return IS_ENABLED(CONFIG_DEVICE_PRIVATE) &&
is_zone_device_page(page) &&
page->pgmap->type == MEMORY_DEVICE_PRIVATE;
}
static inline bool folio_is_device_private(const struct folio *folio)
{
return is_device_private_page(&folio->page);
}
static inline bool is_pci_p2pdma_page(const struct page *page)
{
return IS_ENABLED(CONFIG_PCI_P2PDMA) &&
is_zone_device_page(page) &&
page->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA;
}
#ifdef CONFIG_ZONE_DEVICE
void *memremap_pages(struct dev_pagemap *pgmap, int nid);
void memunmap_pages(struct dev_pagemap *pgmap);

296
include/linux/mm.h
View File

@ -3,9 +3,6 @@
#define _LINUX_MM_H
#include <linux/errno.h>
#ifdef __KERNEL__
#include <linux/mmdebug.h>
#include <linux/gfp.h>
#include <linux/bug.h>
@ -26,7 +23,6 @@
#include <linux/err.h>
#include <linux/page-flags.h>
#include <linux/page_ref.h>
#include <linux/memremap.h>
#include <linux/overflow.h>
#include <linux/sizes.h>
#include <linux/sched.h>
@ -216,8 +212,10 @@ int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *,
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
#define folio_page_idx(folio, p) (page_to_pfn(p) - folio_pfn(folio))
#else
#define nth_page(page,n) ((page) + (n))
#define folio_page_idx(folio, p) ((p) - &(folio)->page)
#endif
/* to align the pointer to the (next) page boundary */
@ -227,6 +225,10 @@ int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *,
#define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
#define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
static inline struct folio *lru_to_folio(struct list_head *head)
{
return list_entry((head)->prev, struct folio, lru);
}
void setup_initial_init_mm(void *start_code, void *end_code,
void *end_data, void *brk);
@ -775,21 +777,26 @@ static inline int is_vmalloc_or_module_addr(const void *x)
}
#endif
static inline int head_compound_mapcount(struct page *head)
/*
* How many times the entire folio is mapped as a single unit (eg by a
* PMD or PUD entry). This is probably not what you want, except for
* debugging purposes; look at folio_mapcount() or page_mapcount()
* instead.
*/
static inline int folio_entire_mapcount(struct folio *folio)
{
return atomic_read(compound_mapcount_ptr(head)) + 1;
VM_BUG_ON_FOLIO(!folio_test_large(folio), folio);
return atomic_read(folio_mapcount_ptr(folio)) + 1;
}
/*
* Mapcount of compound page as a whole, does not include mapped sub-pages.
*
* Must be called only for compound pages or any their tail sub-pages.
* Must be called only for compound pages.
*/
static inline int compound_mapcount(struct page *page)
{
VM_BUG_ON_PAGE(!PageCompound(page), page);
page = compound_head(page);
return head_compound_mapcount(page);
return folio_entire_mapcount(page_folio(page));
}
/*
@ -819,8 +826,14 @@ static inline int page_mapcount(struct page *page)
return atomic_read(&page->_mapcount) + 1;
}
int folio_mapcount(struct folio *folio);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
int total_mapcount(struct page *page);
static inline int total_mapcount(struct page *page)
{
return folio_mapcount(page_folio(page));
}
int page_trans_huge_mapcount(struct page *page);
#else
static inline int total_mapcount(struct page *page)
@ -890,33 +903,17 @@ static inline void destroy_compound_page(struct page *page)
compound_page_dtors[page[1].compound_dtor](page);
}
static inline bool hpage_pincount_available(struct page *page)
{
/*
* Can the page->hpage_pinned_refcount field be used? That field is in
* the 3rd page of the compound page, so the smallest (2-page) compound
* pages cannot support it.
*/
page = compound_head(page);
return PageCompound(page) && compound_order(page) > 1;
}
static inline int head_compound_pincount(struct page *head)
{
return atomic_read(compound_pincount_ptr(head));
}
static inline int compound_pincount(struct page *page)
{
VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
page = compound_head(page);
return head_compound_pincount(page);
}
static inline void set_compound_order(struct page *page, unsigned int order)
{
page[1].compound_order = order;
#ifdef CONFIG_64BIT
page[1].compound_nr = 1U << order;
#endif
}
/* Returns the number of pages in this potentially compound page. */
@ -924,7 +921,11 @@ static inline unsigned long compound_nr(struct page *page)
{
if (!PageHead(page))
return 1;
#ifdef CONFIG_64BIT
return page[1].compound_nr;
#else
return 1UL << compound_order(page);
#endif
}
/* Returns the number of bytes in this potentially compound page. */
@ -939,6 +940,37 @@ static inline unsigned int page_shift(struct page *page)
return PAGE_SHIFT + compound_order(page);
}
/**
* thp_order - Order of a transparent huge page.
* @page: Head page of a transparent huge page.
*/
static inline unsigned int thp_order(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
return compound_order(page);
}
/**
* thp_nr_pages - The number of regular pages in this huge page.
* @page: The head page of a huge page.
*/
static inline int thp_nr_pages(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
return compound_nr(page);
}
/**
* thp_size - Size of a transparent huge page.
* @page: Head page of a transparent huge page.
*
* Return: Number of bytes in this page.
*/
static inline unsigned long thp_size(struct page *page)
{
return PAGE_SIZE << thp_order(page);
}
void free_compound_page(struct page *page);
#ifdef CONFIG_MMU
@ -1090,59 +1122,35 @@ static inline bool is_zone_device_page(const struct page *page)
}
#endif
static inline bool folio_is_zone_device(const struct folio *folio)
{
return is_zone_device_page(&folio->page);
}
static inline bool is_zone_movable_page(const struct page *page)
{
return page_zonenum(page) == ZONE_MOVABLE;
}
#ifdef CONFIG_DEV_PAGEMAP_OPS
void free_devmap_managed_page(struct page *page);
#if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_FS_DAX)
DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
static inline bool page_is_devmap_managed(struct page *page)
bool __put_devmap_managed_page(struct page *page);
static inline bool put_devmap_managed_page(struct page *page)
{
if (!static_branch_unlikely(&devmap_managed_key))
return false;
if (!is_zone_device_page(page))
return false;
switch (page->pgmap->type) {
case MEMORY_DEVICE_PRIVATE:
case MEMORY_DEVICE_FS_DAX:
return true;
default:
break;
}
return false;
return __put_devmap_managed_page(page);
}
void put_devmap_managed_page(struct page *page);
#else /* CONFIG_DEV_PAGEMAP_OPS */
static inline bool page_is_devmap_managed(struct page *page)
#else /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */
static inline bool put_devmap_managed_page(struct page *page)
{
return false;
}
static inline void put_devmap_managed_page(struct page *page)
{
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
static inline bool is_device_private_page(const struct page *page)
{
return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) &&
IS_ENABLED(CONFIG_DEVICE_PRIVATE) &&
is_zone_device_page(page) &&
page->pgmap->type == MEMORY_DEVICE_PRIVATE;
}
static inline bool is_pci_p2pdma_page(const struct page *page)
{
return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) &&
IS_ENABLED(CONFIG_PCI_P2PDMA) &&
is_zone_device_page(page) &&
page->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA;
}
#endif /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */
/* 127: arbitrary random number, small enough to assemble well */
#define folio_ref_zero_or_close_to_overflow(folio) \
@ -1168,9 +1176,6 @@ static inline void get_page(struct page *page)
}
bool __must_check try_grab_page(struct page *page, unsigned int flags);
struct page *try_grab_compound_head(struct page *page, int refs,
unsigned int flags);
static inline __must_check bool try_get_page(struct page *page)
{
@ -1225,16 +1230,11 @@ static inline void put_page(struct page *page)
struct folio *folio = page_folio(page);
/*
* For devmap managed pages we need to catch refcount transition from
* 2 to 1, when refcount reach one it means the page is free and we
* need to inform the device driver through callback. See
* include/linux/memremap.h and HMM for details.
* For some devmap managed pages we need to catch refcount transition
* from 2 to 1:
*/
if (page_is_devmap_managed(&folio->page)) {
put_devmap_managed_page(&folio->page);
if (put_devmap_managed_page(&folio->page))
return;
}
folio_put(folio);
}
@ -1264,10 +1264,9 @@ static inline void put_page(struct page *page)
* applications that don't have huge page reference counts, this won't be an
* issue.
*
* Locking: the lockless algorithm described in page_cache_get_speculative()
* and page_cache_gup_pin_speculative() provides safe operation for
* get_user_pages and page_mkclean and other calls that race to set up page
* table entries.
* Locking: the lockless algorithm described in folio_try_get_rcu()
* provides safe operation for get_user_pages(), page_mkclean() and
* other calls that race to set up page table entries.
*/
#define GUP_PIN_COUNTING_BIAS (1U << 10)
@ -1278,70 +1277,11 @@ void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages,
bool make_dirty);
void unpin_user_pages(struct page **pages, unsigned long npages);
/**
* page_maybe_dma_pinned - Report if a page is pinned for DMA.
* @page: The page.
*
* This function checks if a page has been pinned via a call to
* a function in the pin_user_pages() family.
*
* For non-huge pages, the return value is partially fuzzy: false is not fuzzy,
* because it means "definitely not pinned for DMA", but true means "probably
* pinned for DMA, but possibly a false positive due to having at least
* GUP_PIN_COUNTING_BIAS worth of normal page references".
*
* False positives are OK, because: a) it's unlikely for a page to get that many
* refcounts, and b) all the callers of this routine are expected to be able to
* deal gracefully with a false positive.
*
* For huge pages, the result will be exactly correct. That's because we have
* more tracking data available: the 3rd struct page in the compound page is
* used to track the pincount (instead using of the GUP_PIN_COUNTING_BIAS
* scheme).
*
* For more information, please see Documentation/core-api/pin_user_pages.rst.
*
* Return: True, if it is likely that the page has been "dma-pinned".
* False, if the page is definitely not dma-pinned.
*/
static inline bool page_maybe_dma_pinned(struct page *page)
{
if (hpage_pincount_available(page))
return compound_pincount(page) > 0;
/*
* page_ref_count() is signed. If that refcount overflows, then
* page_ref_count() returns a negative value, and callers will avoid
* further incrementing the refcount.
*
* Here, for that overflow case, use the signed bit to count a little
* bit higher via unsigned math, and thus still get an accurate result.
*/
return ((unsigned int)page_ref_count(compound_head(page))) >=
GUP_PIN_COUNTING_BIAS;
}
static inline bool is_cow_mapping(vm_flags_t flags)
{
return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
}
/*
* This should most likely only be called during fork() to see whether we
* should break the cow immediately for a page on the src mm.
*/
static inline bool page_needs_cow_for_dma(struct vm_area_struct *vma,
struct page *page)
{
if (!is_cow_mapping(vma->vm_flags))
return false;
if (!test_bit(MMF_HAS_PINNED, &vma->vm_mm->flags))
return false;
return page_maybe_dma_pinned(page);
}
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
#define SECTION_IN_PAGE_FLAGS
#endif
@ -1586,6 +1526,74 @@ static inline unsigned long folio_pfn(struct folio *folio)
return page_to_pfn(&folio->page);
}
static inline atomic_t *folio_pincount_ptr(struct folio *folio)
{
return &folio_page(folio, 1)->compound_pincount;
}
/**
* folio_maybe_dma_pinned - Report if a folio may be pinned for DMA.
* @folio: The folio.
*
* This function checks if a folio has been pinned via a call to
* a function in the pin_user_pages() family.
*
* For small folios, the return value is partially fuzzy: false is not fuzzy,
* because it means "definitely not pinned for DMA", but true means "probably
* pinned for DMA, but possibly a false positive due to having at least
* GUP_PIN_COUNTING_BIAS worth of normal folio references".
*
* False positives are OK, because: a) it's unlikely for a folio to
* get that many refcounts, and b) all the callers of this routine are
* expected to be able to deal gracefully with a false positive.
*
* For large folios, the result will be exactly correct. That's because
* we have more tracking data available: the compound_pincount is used
* instead of the GUP_PIN_COUNTING_BIAS scheme.
*
* For more information, please see Documentation/core-api/pin_user_pages.rst.
*
* Return: True, if it is likely that the page has been "dma-pinned".
* False, if the page is definitely not dma-pinned.
*/
static inline bool folio_maybe_dma_pinned(struct folio *folio)
{
if (folio_test_large(folio))
return atomic_read(folio_pincount_ptr(folio)) > 0;
/*
* folio_ref_count() is signed. If that refcount overflows, then
* folio_ref_count() returns a negative value, and callers will avoid
* further incrementing the refcount.
*
* Here, for that overflow case, use the sign bit to count a little
* bit higher via unsigned math, and thus still get an accurate result.
*/
return ((unsigned int)folio_ref_count(folio)) >=
GUP_PIN_COUNTING_BIAS;
}
static inline bool page_maybe_dma_pinned(struct page *page)
{
return folio_maybe_dma_pinned(page_folio(page));
}
/*
* This should most likely only be called during fork() to see whether we
* should break the cow immediately for a page on the src mm.
*/
static inline bool page_needs_cow_for_dma(struct vm_area_struct *vma,
struct page *page)
{
if (!is_cow_mapping(vma->vm_flags))
return false;
if (!test_bit(MMF_HAS_PINNED, &vma->vm_mm->flags))
return false;
return page_maybe_dma_pinned(page);
}
/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
#ifdef CONFIG_MIGRATION
static inline bool is_pinnable_page(struct page *page)
@ -1600,6 +1608,11 @@ static inline bool is_pinnable_page(struct page *page)
}
#endif
static inline bool folio_is_pinnable(struct folio *folio)
{
return is_pinnable_page(&folio->page);
}
static inline void set_page_zone(struct page *page, enum zone_type zone)
{
page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
@ -1749,7 +1762,6 @@ static inline void *folio_address(const struct folio *folio)
}
extern void *page_rmapping(struct page *page);
extern struct anon_vma *page_anon_vma(struct page *page);
extern pgoff_t __page_file_index(struct page *page);
/*
@ -1855,7 +1867,6 @@ extern void truncate_setsize(struct inode *inode, loff_t newsize);
void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to);
void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
int generic_error_remove_page(struct address_space *mapping, struct page *page);
int invalidate_inode_page(struct page *page);
#ifdef CONFIG_MMU
extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma,
@ -2921,13 +2932,11 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
#define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
#define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO
* and return without waiting upon it */
#define FOLL_POPULATE 0x40 /* fault in pages (with FOLL_MLOCK) */
#define FOLL_NOFAULT 0x80 /* do not fault in pages */
#define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */
#define FOLL_NUMA 0x200 /* force NUMA hinting page fault */
#define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */
#define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */
#define FOLL_MLOCK 0x1000 /* lock present pages */
#define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */
#define FOLL_COW 0x4000 /* internal GUP flag */
#define FOLL_ANON 0x8000 /* don't do file mappings */
@ -3381,5 +3390,4 @@ madvise_set_anon_name(struct mm_struct *mm, unsigned long start,
}
#endif
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */

11
include/linux/mm_inline.h
View File

@ -99,7 +99,8 @@ void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio)
update_lru_size(lruvec, lru, folio_zonenum(folio),
folio_nr_pages(folio));
list_add(&folio->lru, &lruvec->lists[lru]);
if (lru != LRU_UNEVICTABLE)
list_add(&folio->lru, &lruvec->lists[lru]);
}
static __always_inline void add_page_to_lru_list(struct page *page,
@ -115,6 +116,7 @@ void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio)
update_lru_size(lruvec, lru, folio_zonenum(folio),
folio_nr_pages(folio));
/* This is not expected to be used on LRU_UNEVICTABLE */
list_add_tail(&folio->lru, &lruvec->lists[lru]);
}
@ -127,8 +129,11 @@ static __always_inline void add_page_to_lru_list_tail(struct page *page,
static __always_inline
void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
{
list_del(&folio->lru);
update_lru_size(lruvec, folio_lru_list(folio), folio_zonenum(folio),
enum lru_list lru = folio_lru_list(folio);
if (lru != LRU_UNEVICTABLE)
list_del(&folio->lru);
update_lru_size(lruvec, lru, folio_zonenum(folio),
-folio_nr_pages(folio));
}

26
include/linux/mm_types.h
View File

@ -85,7 +85,16 @@ struct page {
* lruvec->lru_lock. Sometimes used as a generic list
* by the page owner.
*/
struct list_head lru;
union {
struct list_head lru;
/* Or, for the Unevictable "LRU list" slot */
struct {
/* Always even, to negate PageTail */
void *__filler;
/* Count page's or folio's mlocks */
unsigned int mlock_count;
};
};
/* See page-flags.h for PAGE_MAPPING_FLAGS */
struct address_space *mapping;
pgoff_t index; /* Our offset within mapping. */
@ -126,11 +135,14 @@ struct page {
unsigned char compound_dtor;
unsigned char compound_order;
atomic_t compound_mapcount;
atomic_t compound_pincount;
#ifdef CONFIG_64BIT
unsigned int compound_nr; /* 1 << compound_order */
#endif
};
struct { /* Second tail page of compound page */
unsigned long _compound_pad_1; /* compound_head */
atomic_t hpage_pinned_refcount;
unsigned long _compound_pad_2;
/* For both global and memcg */
struct list_head deferred_list;
};
@ -241,7 +253,13 @@ struct folio {
struct {
/* public: */
unsigned long flags;
struct list_head lru;
union {
struct list_head lru;
struct {
void *__filler;
unsigned int mlock_count;
};
};
struct address_space *mapping;
pgoff_t index;
void *private;
@ -285,7 +303,7 @@ static inline atomic_t *compound_mapcount_ptr(struct page *page)
static inline atomic_t *compound_pincount_ptr(struct page *page)
{
return &page[2].hpage_pinned_refcount;
return &page[1].compound_pincount;
}
/*

146
include/linux/pagemap.h
View File

@ -18,6 +18,120 @@
struct folio_batch;
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end);
static inline void invalidate_remote_inode(struct inode *inode)
{
if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode))
invalidate_mapping_pages(inode->i_mapping, 0, -1);
}
int invalidate_inode_pages2(struct address_space *mapping);
int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
int write_inode_now(struct inode *, int sync);
int filemap_fdatawrite(struct address_space *);
int filemap_flush(struct address_space *);
int filemap_fdatawait_keep_errors(struct address_space *mapping);
int filemap_fdatawait_range(struct address_space *, loff_t lstart, loff_t lend);
int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
loff_t start_byte, loff_t end_byte);
static inline int filemap_fdatawait(struct address_space *mapping)
{
return filemap_fdatawait_range(mapping, 0, LLONG_MAX);
}
bool filemap_range_has_page(struct address_space *, loff_t lstart, loff_t lend);
int filemap_write_and_wait_range(struct address_space *mapping,
loff_t lstart, loff_t lend);
int __filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end, int sync_mode);
int filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end);
int filemap_check_errors(struct address_space *mapping);
void __filemap_set_wb_err(struct address_space *mapping, int err);
int filemap_fdatawrite_wbc(struct address_space *mapping,
struct writeback_control *wbc);
static inline int filemap_write_and_wait(struct address_space *mapping)
{
return filemap_write_and_wait_range(mapping, 0, LLONG_MAX);
}
/**
* filemap_set_wb_err - set a writeback error on an address_space
* @mapping: mapping in which to set writeback error
* @err: error to be set in mapping
*
* When writeback fails in some way, we must record that error so that
* userspace can be informed when fsync and the like are called. We endeavor
* to report errors on any file that was open at the time of the error. Some
* internal callers also need to know when writeback errors have occurred.
*
* When a writeback error occurs, most filesystems will want to call
* filemap_set_wb_err to record the error in the mapping so that it will be
* automatically reported whenever fsync is called on the file.
*/
static inline void filemap_set_wb_err(struct address_space *mapping, int err)
{
/* Fastpath for common case of no error */
if (unlikely(err))
__filemap_set_wb_err(mapping, err);
}
/**
* filemap_check_wb_err - has an error occurred since the mark was sampled?
* @mapping: mapping to check for writeback errors
* @since: previously-sampled errseq_t
*
* Grab the errseq_t value from the mapping, and see if it has changed "since"
* the given value was sampled.
*
* If it has then report the latest error set, otherwise return 0.
*/
static inline int filemap_check_wb_err(struct address_space *mapping,
errseq_t since)
{
return errseq_check(&mapping->wb_err, since);
}
/**
* filemap_sample_wb_err - sample the current errseq_t to test for later errors
* @mapping: mapping to be sampled
*
* Writeback errors are always reported relative to a particular sample point
* in the past. This function provides those sample points.
*/
static inline errseq_t filemap_sample_wb_err(struct address_space *mapping)
{
return errseq_sample(&mapping->wb_err);
}
/**
* file_sample_sb_err - sample the current errseq_t to test for later errors
* @file: file pointer to be sampled
*
* Grab the most current superblock-level errseq_t value for the given
* struct file.
*/
static inline errseq_t file_sample_sb_err(struct file *file)
{
return errseq_sample(&file->f_path.dentry->d_sb->s_wb_err);
}
/*
* Flush file data before changing attributes. Caller must hold any locks
* required to prevent further writes to this file until we're done setting
* flags.
*/
static inline int inode_drain_writes(struct inode *inode)
{
inode_dio_wait(inode);
return filemap_write_and_wait(inode->i_mapping);
}
static inline bool mapping_empty(struct address_space *mapping)
{
return xa_empty(&mapping->i_pages);
@ -192,9 +306,14 @@ static inline void mapping_set_large_folios(struct address_space *mapping)
__set_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
}
/*
* Large folio support currently depends on THP. These dependencies are
* being worked on but are not yet fixed.
*/
static inline bool mapping_large_folio_support(struct address_space *mapping)
{
return test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
return IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
}
static inline int filemap_nr_thps(struct address_space *mapping)
@ -212,7 +331,7 @@ static inline void filemap_nr_thps_inc(struct address_space *mapping)
if (!mapping_large_folio_support(mapping))
atomic_inc(&mapping->nr_thps);
#else
WARN_ON_ONCE(1);
WARN_ON_ONCE(mapping_large_folio_support(mapping) == 0);
#endif
}
@ -222,7 +341,7 @@ static inline void filemap_nr_thps_dec(struct address_space *mapping)
if (!mapping_large_folio_support(mapping))
atomic_dec(&mapping->nr_thps);
#else
WARN_ON_ONCE(1);
WARN_ON_ONCE(mapping_large_folio_support(mapping) == 0);
#endif
}
@ -283,16 +402,6 @@ static inline struct inode *folio_inode(struct folio *folio)
return folio->mapping->host;
}
static inline bool page_cache_add_speculative(struct page *page, int count)
{
return folio_ref_try_add_rcu((struct folio *)page, count);
}
static inline bool page_cache_get_speculative(struct page *page)
{
return page_cache_add_speculative(page, 1);
}
/**
* folio_attach_private - Attach private data to a folio.
* @folio: Folio to attach data to.
@ -706,6 +815,17 @@ static inline loff_t folio_file_pos(struct folio *folio)
return page_file_offset(&folio->page);
}
/*
* Get the offset in PAGE_SIZE (even for hugetlb folios).
* (TODO: hugetlb folios should have ->index in PAGE_SIZE)
*/
static inline pgoff_t folio_pgoff(struct folio *folio)
{
if (unlikely(folio_test_hugetlb(folio)))
return hugetlb_basepage_index(&folio->page);
return folio->index;
}
extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
unsigned long address);

76
include/linux/rmap.h
View File

@ -11,6 +11,7 @@
#include <linux/rwsem.h>
#include <linux/memcontrol.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
/*
* The anon_vma heads a list of private "related" vmas, to scan if
@ -167,18 +168,19 @@ struct anon_vma *page_get_anon_vma(struct page *page);
*/
void page_move_anon_rmap(struct page *, struct vm_area_struct *);
void page_add_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long, bool);
unsigned long address, bool compound);
void do_page_add_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long, int);
unsigned long address, int flags);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long, bool);
void page_add_file_rmap(struct page *, bool);
void page_remove_rmap(struct page *, bool);
unsigned long address, bool compound);
void page_add_file_rmap(struct page *, struct vm_area_struct *,
bool compound);
void page_remove_rmap(struct page *, struct vm_area_struct *,
bool compound);
void hugepage_add_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long);
unsigned long address);
void hugepage_add_new_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long);
unsigned long address);
static inline void page_dup_rmap(struct page *page, bool compound)
{
@ -188,11 +190,11 @@ static inline void page_dup_rmap(struct page *page, bool compound)
/*
* Called from mm/vmscan.c to handle paging out
*/
int page_referenced(struct page *, int is_locked,
int folio_referenced(struct folio *, int is_locked,
struct mem_cgroup *memcg, unsigned long *vm_flags);
void try_to_migrate(struct page *page, enum ttu_flags flags);
void try_to_unmap(struct page *, enum ttu_flags flags);
void try_to_migrate(struct folio *folio, enum ttu_flags flags);
void try_to_unmap(struct folio *, enum ttu_flags flags);
int make_device_exclusive_range(struct mm_struct *mm, unsigned long start,
unsigned long end, struct page **pages,
@ -200,11 +202,13 @@ int make_device_exclusive_range(struct mm_struct *mm, unsigned long start,
/* Avoid racy checks */
#define PVMW_SYNC (1 << 0)
/* Look for migarion entries rather than present PTEs */
/* Look for migration entries rather than present PTEs */
#define PVMW_MIGRATION (1 << 1)
struct page_vma_mapped_walk {
struct page *page;
unsigned long pfn;
unsigned long nr_pages;
pgoff_t pgoff;
struct vm_area_struct *vma;
unsigned long address;
pmd_t *pmd;
@ -213,10 +217,30 @@ struct page_vma_mapped_walk {
unsigned int flags;
};
#define DEFINE_PAGE_VMA_WALK(name, _page, _vma, _address, _flags) \
struct page_vma_mapped_walk name = { \
.pfn = page_to_pfn(_page), \
.nr_pages = compound_nr(page), \
.pgoff = page_to_pgoff(page), \
.vma = _vma, \
.address = _address, \
.flags = _flags, \
}
#define DEFINE_FOLIO_VMA_WALK(name, _folio, _vma, _address, _flags) \
struct page_vma_mapped_walk name = { \
.pfn = folio_pfn(_folio), \
.nr_pages = folio_nr_pages(_folio), \
.pgoff = folio_pgoff(_folio), \
.vma = _vma, \
.address = _address, \
.flags = _flags, \
}
static inline void page_vma_mapped_walk_done(struct page_vma_mapped_walk *pvmw)
{
/* HugeTLB pte is set to the relevant page table entry without pte_mapped. */
if (pvmw->pte && !PageHuge(pvmw->page))
if (pvmw->pte && !is_vm_hugetlb_page(pvmw->vma))
pte_unmap(pvmw->pte);
if (pvmw->ptl)
spin_unlock(pvmw->ptl);
@ -237,18 +261,12 @@ unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
*/
int folio_mkclean(struct folio *);
/*
* called in munlock()/munmap() path to check for other vmas holding
* the page mlocked.
*/
void page_mlock(struct page *page);
void remove_migration_ptes(struct page *old, struct page *new, bool locked);
void remove_migration_ptes(struct folio *src, struct folio *dst, bool locked);
/*
* Called by memory-failure.c to kill processes.
*/
struct anon_vma *page_lock_anon_vma_read(struct page *page);
struct anon_vma *folio_lock_anon_vma_read(struct folio *folio);
void page_unlock_anon_vma_read(struct anon_vma *anon_vma);
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);
@ -267,15 +285,15 @@ struct rmap_walk_control {
* Return false if page table scanning in rmap_walk should be stopped.
* Otherwise, return true.
*/
bool (*rmap_one)(struct page *page, struct vm_area_struct *vma,
bool (*rmap_one)(struct folio *folio, struct vm_area_struct *vma,
unsigned long addr, void *arg);
int (*done)(struct page *page);
struct anon_vma *(*anon_lock)(struct page *page);
int (*done)(struct folio *folio);
struct anon_vma *(*anon_lock)(struct folio *folio);
bool (*invalid_vma)(struct vm_area_struct *vma, void *arg);
};
void rmap_walk(struct page *page, struct rmap_walk_control *rwc);
void rmap_walk_locked(struct page *page, struct rmap_walk_control *rwc);
void rmap_walk(struct folio *folio, const struct rmap_walk_control *rwc);
void rmap_walk_locked(struct folio *folio, const struct rmap_walk_control *rwc);
#else /* !CONFIG_MMU */
@ -283,7 +301,7 @@ void rmap_walk_locked(struct page *page, struct rmap_walk_control *rwc);
#define anon_vma_prepare(vma) (0)
#define anon_vma_link(vma) do {} while (0)
static inline int page_referenced(struct page *page, int is_locked,
static inline int folio_referenced(struct folio *folio, int is_locked,
struct mem_cgroup *memcg,
unsigned long *vm_flags)
{
@ -291,7 +309,7 @@ static inline int page_referenced(struct page *page, int is_locked,
return 0;
}
static inline void try_to_unmap(struct page *page, enum ttu_flags flags)
static inline void try_to_unmap(struct folio *folio, enum ttu_flags flags)
{
}

9
include/linux/swap.h
View File

@ -328,7 +328,7 @@ static inline swp_entry_t folio_swap_entry(struct folio *folio)
/* linux/mm/workingset.c */
void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages);
void *workingset_eviction(struct page *page, struct mem_cgroup *target_memcg);
void *workingset_eviction(struct folio *folio, struct mem_cgroup *target_memcg);
void workingset_refault(struct folio *folio, void *shadow);
void workingset_activation(struct folio *folio);
@ -375,7 +375,6 @@ extern void lru_add_drain(void);
extern void lru_add_drain_cpu(int cpu);
extern void lru_add_drain_cpu_zone(struct zone *zone);
extern void lru_add_drain_all(void);
extern void deactivate_file_page(struct page *page);
extern void deactivate_page(struct page *page);
extern void mark_page_lazyfree(struct page *page);
extern void swap_setup(void);
@ -397,7 +396,7 @@ extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
unsigned long *nr_scanned);
extern unsigned long shrink_all_memory(unsigned long nr_pages);
extern int vm_swappiness;
extern int remove_mapping(struct address_space *mapping, struct page *page);
long remove_mapping(struct address_space *mapping, struct folio *folio);
extern unsigned long reclaim_pages(struct list_head *page_list);
#ifdef CONFIG_NUMA
@ -743,7 +742,7 @@ static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
#endif
#ifdef CONFIG_MEMCG_SWAP
extern void mem_cgroup_swapout(struct page *page, swp_entry_t entry);
void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry);
extern int __mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry);
static inline int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry)
{
@ -763,7 +762,7 @@ static inline void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_p
extern long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg);
extern bool mem_cgroup_swap_full(struct page *page);
#else
static inline void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
static inline void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry)
{
}

10
include/trace/events/vmscan.h
View File

@ -327,11 +327,11 @@ TRACE_EVENT(mm_vmscan_lru_isolate,
__print_symbolic(__entry->lru, LRU_NAMES))
);
TRACE_EVENT(mm_vmscan_writepage,
TRACE_EVENT(mm_vmscan_write_folio,
TP_PROTO(struct page *page),
TP_PROTO(struct folio *folio),
TP_ARGS(page),
TP_ARGS(folio),
TP_STRUCT__entry(
__field(unsigned long, pfn)
@ -339,9 +339,9 @@ TRACE_EVENT(mm_vmscan_writepage,
),
TP_fast_assign(
__entry->pfn = page_to_pfn(page);
__entry->pfn = folio_pfn(folio);
__entry->reclaim_flags = trace_reclaim_flags(
page_is_file_lru(page));
folio_is_file_lru(folio));
),
TP_printk("page=%p pfn=0x%lx flags=%s",

13
kernel/events/uprobes.c
View File

@ -155,11 +155,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
struct page *old_page, struct page *new_page)
{
struct mm_struct *mm = vma->vm_mm;
struct page_vma_mapped_walk pvmw = {
.page = compound_head(old_page),
.vma = vma,
.address = addr,
};
DEFINE_FOLIO_VMA_WALK(pvmw, page_folio(old_page), vma, addr, 0);
int err;
struct mmu_notifier_range range;
@ -173,7 +169,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
return err;
}
/* For try_to_free_swap() and munlock_vma_page() below */
/* For try_to_free_swap() below */
lock_page(old_page);
mmu_notifier_invalidate_range_start(&range);
@ -201,13 +197,10 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
set_pte_at_notify(mm, addr, pvmw.pte,
mk_pte(new_page, vma->vm_page_prot));
page_remove_rmap(old_page, false);
page_remove_rmap(old_page, vma, false);
if (!page_mapped(old_page))
try_to_free_swap(old_page);
page_vma_mapped_walk_done(&pvmw);
if ((vma->vm_flags & VM_LOCKED) && !PageCompound(old_page))
munlock_vma_page(old_page);
put_page(old_page);
err = 0;

2
kernel/futex/core.c
View File

@ -302,7 +302,7 @@ int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key,
* found it, but truncated or holepunched or subjected to
* invalidate_complete_page2 before we got the page lock (also
* cases which we are happy to fail). And we hold a reference,
* so refcount care in invalidate_complete_page's remove_mapping
* so refcount care in invalidate_inode_page's remove_mapping
* prevents drop_caches from setting mapping to NULL beneath us.
*
* The case we do have to guard against is when memory pressure made

4
lib/test_hmm.c
View File

@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/memremap.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
@ -26,6 +27,8 @@
#include <linux/sched/mm.h>
#include <linux/platform_device.h>
#include <linux/rmap.h>
#include <linux/mmu_notifier.h>
#include <linux/migrate.h>
#include "test_hmm_uapi.h"
@ -563,7 +566,6 @@ static struct page *dmirror_devmem_alloc_page(struct dmirror_device *mdevice)
}
dpage->zone_device_data = rpage;
get_page(dpage);
lock_page(dpage);
return dpage;

7
mm/Kconfig
View File

@ -249,6 +249,9 @@ config MIGRATION
pages as migration can relocate pages to satisfy a huge page
allocation instead of reclaiming.
config DEVICE_MIGRATION
def_bool MIGRATION && ZONE_DEVICE
config ARCH_ENABLE_HUGEPAGE_MIGRATION
bool
@ -791,9 +794,6 @@ config ZONE_DEVICE
If FS_DAX is enabled, then say Y.
config DEV_PAGEMAP_OPS
bool
#
# Helpers to mirror range of the CPU page tables of a process into device page
# tables.
@ -805,7 +805,6 @@ config HMM_MIRROR
config DEVICE_PRIVATE
bool "Unaddressable device memory (GPU memory, ...)"
depends on ZONE_DEVICE
select DEV_PAGEMAP_OPS
help
Allows creation of struct pages to represent unaddressable device

1
mm/Makefile
View File

@ -92,6 +92,7 @@ obj-$(CONFIG_KFENCE) += kfence/
obj-$(CONFIG_FAILSLAB) += failslab.o
obj-$(CONFIG_MEMTEST) += memtest.o
obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_DEVICE_MIGRATION) += migrate_device.o
obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o khugepaged.o
obj-$(CONFIG_PAGE_COUNTER) += page_counter.o
obj-$(CONFIG_MEMCG) += memcontrol.o vmpressure.o

62
mm/damon/paddr.c
View File

@ -16,14 +16,10 @@
#include "../internal.h"
#include "ops-common.h"
static bool __damon_pa_mkold(struct page *page, struct vm_area_struct *vma,
static bool __damon_pa_mkold(struct folio *folio, struct vm_area_struct *vma,
unsigned long addr, void *arg)
{
struct page_vma_mapped_walk pvmw = {
.page = page,
.vma = vma,
.address = addr,
};
DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
while (page_vma_mapped_walk(&pvmw)) {
addr = pvmw.address;
@ -37,32 +33,34 @@ static bool __damon_pa_mkold(struct page *page, struct vm_area_struct *vma,
static void damon_pa_mkold(unsigned long paddr)
{
struct folio *folio;
struct page *page = damon_get_page(PHYS_PFN(paddr));
struct rmap_walk_control rwc = {
.rmap_one = __damon_pa_mkold,
.anon_lock = page_lock_anon_vma_read,
.anon_lock = folio_lock_anon_vma_read,
};
bool need_lock;
if (!page)
return;
folio = page_folio(page);
if (!page_mapped(page) || !page_rmapping(page)) {
set_page_idle(page);
if (!folio_mapped(folio) || !folio_raw_mapping(folio)) {
folio_set_idle(folio);
goto out;
}
need_lock = !PageAnon(page) || PageKsm(page);
if (need_lock && !trylock_page(page))
need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
if (need_lock && !folio_trylock(folio))
goto out;
rmap_walk(page, &rwc);
rmap_walk(folio, &rwc);
if (need_lock)
unlock_page(page);
folio_unlock(folio);
out:
put_page(page);
folio_put(folio);
}
static void __damon_pa_prepare_access_check(struct damon_ctx *ctx,
@ -89,15 +87,11 @@ struct damon_pa_access_chk_result {
bool accessed;
};
static bool __damon_pa_young(struct page *page, struct vm_area_struct *vma,
static bool __damon_pa_young(struct folio *folio, struct vm_area_struct *vma,
unsigned long addr, void *arg)
{
struct damon_pa_access_chk_result *result = arg;
struct page_vma_mapped_walk pvmw = {
.page = page,
.vma = vma,
.address = addr,
};
DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
result->accessed = false;
result->page_sz = PAGE_SIZE;
@ -105,12 +99,12 @@ static bool __damon_pa_young(struct page *page, struct vm_area_struct *vma,
addr = pvmw.address;
if (pvmw.pte) {
result->accessed = pte_young(*pvmw.pte) ||
!page_is_idle(page) ||
!folio_test_idle(folio) ||
mmu_notifier_test_young(vma->vm_mm, addr);
} else {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
result->accessed = pmd_young(*pvmw.pmd) ||
!page_is_idle(page) ||
!folio_test_idle(folio) ||
mmu_notifier_test_young(vma->vm_mm, addr);
result->page_sz = ((1UL) << HPAGE_PMD_SHIFT);
#else
@ -129,6 +123,7 @@ static bool __damon_pa_young(struct page *page, struct vm_area_struct *vma,
static bool damon_pa_young(unsigned long paddr, unsigned long *page_sz)
{
struct folio *folio;
struct page *page = damon_get_page(PHYS_PFN(paddr));
struct damon_pa_access_chk_result result = {
.page_sz = PAGE_SIZE,
@ -137,33 +132,34 @@ static bool damon_pa_young(unsigned long paddr, unsigned long *page_sz)
struct rmap_walk_control rwc = {
.arg = &result,
.rmap_one = __damon_pa_young,
.anon_lock = page_lock_anon_vma_read,
.anon_lock = folio_lock_anon_vma_read,
};
bool need_lock;
if (!page)
return false;
folio = page_folio(page);
if (!page_mapped(page) || !page_rmapping(page)) {
if (page_is_idle(page))
if (!folio_mapped(folio) || !folio_raw_mapping(folio)) {
if (folio_test_idle(folio))
result.accessed = false;
else
result.accessed = true;
put_page(page);
folio_put(folio);
goto out;
}
need_lock = !PageAnon(page) || PageKsm(page);
if (need_lock && !trylock_page(page)) {
put_page(page);
return NULL;
need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
if (need_lock && !folio_trylock(folio)) {
folio_put(folio);
return false;
}
rmap_walk(page, &rwc);
rmap_walk(folio, &rwc);
if (need_lock)
unlock_page(page);
put_page(page);
folio_unlock(folio);
folio_put(folio);
out:
*page_sz = result.page_sz;

18
mm/debug.c
View File

@ -48,7 +48,8 @@ const struct trace_print_flags vmaflag_names[] = {
static void __dump_page(struct page *page)
{
struct page *head = compound_head(page);
struct folio *folio = page_folio(page);
struct page *head = &folio->page;
struct address_space *mapping;
bool compound = PageCompound(page);
/*
@ -76,6 +77,7 @@ static void __dump_page(struct page *page)
else
mapping = (void *)(tmp & ~PAGE_MAPPING_FLAGS);
head = page;
folio = (struct folio *)page;
compound = false;
} else {
mapping = page_mapping(page);
@ -92,16 +94,10 @@ static void __dump_page(struct page *page)
page, page_ref_count(head), mapcount, mapping,
page_to_pgoff(page), page_to_pfn(page));
if (compound) {
if (hpage_pincount_available(page)) {
pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
head, compound_order(head),
head_compound_mapcount(head),
head_compound_pincount(head));
} else {
pr_warn("head:%p order:%u compound_mapcount:%d\n",
head, compound_order(head),
head_compound_mapcount(head));
}
pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
head, compound_order(head),
folio_entire_mapcount(folio),
head_compound_pincount(head));
}
#ifdef CONFIG_MEMCG

59
mm/filemap.c
View File

@ -842,26 +842,27 @@ noinline int __filemap_add_folio(struct address_space *mapping,
{
XA_STATE(xas, &mapping->i_pages, index);
int huge = folio_test_hugetlb(folio);
int error;
bool charged = false;
long nr = 1;
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
VM_BUG_ON_FOLIO(folio_test_swapbacked(folio), folio);
mapping_set_update(&xas, mapping);
folio_get(folio);
folio->mapping = mapping;
folio->index = index;
if (!huge) {
error = mem_cgroup_charge(folio, NULL, gfp);
int error = mem_cgroup_charge(folio, NULL, gfp);
VM_BUG_ON_FOLIO(index & (folio_nr_pages(folio) - 1), folio);
if (error)
goto error;
return error;
charged = true;
xas_set_order(&xas, index, folio_order(folio));
nr = folio_nr_pages(folio);
}
gfp &= GFP_RECLAIM_MASK;
folio_ref_add(folio, nr);
folio->mapping = mapping;
folio->index = xas.xa_index;
do {
unsigned int order = xa_get_order(xas.xa, xas.xa_index);
@ -885,6 +886,8 @@ noinline int __filemap_add_folio(struct address_space *mapping,
/* entry may have been split before we acquired lock */
order = xa_get_order(xas.xa, xas.xa_index);
if (order > folio_order(folio)) {
/* How to handle large swap entries? */
BUG_ON(shmem_mapping(mapping));
xas_split(&xas, old, order);
xas_reset(&xas);
}
@ -894,29 +897,31 @@ noinline int __filemap_add_folio(struct address_space *mapping,
if (xas_error(&xas))
goto unlock;
mapping->nrpages++;
mapping->nrpages += nr;
/* hugetlb pages do not participate in page cache accounting */
if (!huge)
__lruvec_stat_add_folio(folio, NR_FILE_PAGES);
if (!huge) {
__lruvec_stat_mod_folio(folio, NR_FILE_PAGES, nr);
if (folio_test_pmd_mappable(folio))
__lruvec_stat_mod_folio(folio,
NR_FILE_THPS, nr);
}
unlock:
xas_unlock_irq(&xas);
} while (xas_nomem(&xas, gfp));
if (xas_error(&xas)) {
error = xas_error(&xas);
if (charged)
mem_cgroup_uncharge(folio);
if (xas_error(&xas))
goto error;
}
trace_mm_filemap_add_to_page_cache(folio);
return 0;
error:
if (charged)
mem_cgroup_uncharge(folio);
folio->mapping = NULL;
/* Leave page->index set: truncation relies upon it */
folio_put(folio);
return error;
folio_put_refs(folio, nr);
return xas_error(&xas);
}
ALLOW_ERROR_INJECTION(__filemap_add_folio, ERRNO);
@ -2997,6 +3002,24 @@ static struct file *do_sync_mmap_readahead(struct vm_fault *vmf)
struct file *fpin = NULL;
unsigned int mmap_miss;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* Use the readahead code, even if readahead is disabled */
if (vmf->vma->vm_flags & VM_HUGEPAGE) {
fpin = maybe_unlock_mmap_for_io(vmf, fpin);
ractl._index &= ~((unsigned long)HPAGE_PMD_NR - 1);
ra->size = HPAGE_PMD_NR;
/*
* Fetch two PMD folios, so we get the chance to actually
* readahead, unless we've been told not to.
*/
if (!(vmf->vma->vm_flags & VM_RAND_READ))
ra->size *= 2;
ra->async_size = HPAGE_PMD_NR;
page_cache_ra_order(&ractl, ra, HPAGE_PMD_ORDER);
return fpin;
}
#endif
/* If we don't want any read-ahead, don't bother */
if (vmf->vma->vm_flags & VM_RAND_READ)
return fpin;
@ -3029,7 +3052,7 @@ static struct file *do_sync_mmap_readahead(struct vm_fault *vmf)
ra->size = ra->ra_pages;
ra->async_size = ra->ra_pages / 4;
ractl._index = ra->start;
do_page_cache_ra(&ractl, ra->size, ra->async_size);
page_cache_ra_order(&ractl, ra, 0);
return fpin;
}

13
mm/folio-compat.c
View File

@ -7,6 +7,7 @@
#include <linux/migrate.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include "internal.h"
struct address_space *page_mapping(struct page *page)
{
@ -151,3 +152,15 @@ int try_to_release_page(struct page *page, gfp_t gfp)
return filemap_release_folio(page_folio(page), gfp);
}
EXPORT_SYMBOL(try_to_release_page);
int isolate_lru_page(struct page *page)
{
if (WARN_RATELIMIT(PageTail(page), "trying to isolate tail page"))
return -EBUSY;
return folio_isolate_lru((struct folio *)page);
}
void putback_lru_page(struct page *page)
{
folio_putback_lru(page_folio(page));
}

492
mm/gup.c
View File

@ -29,107 +29,71 @@ struct follow_page_context {
unsigned int page_mask;
};
static void hpage_pincount_add(struct page *page, int refs)
{
VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
VM_BUG_ON_PAGE(page != compound_head(page), page);
atomic_add(refs, compound_pincount_ptr(page));
}
static void hpage_pincount_sub(struct page *page, int refs)
{
VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
VM_BUG_ON_PAGE(page != compound_head(page), page);
atomic_sub(refs, compound_pincount_ptr(page));
}
/* Equivalent to calling put_page() @refs times. */
static void put_page_refs(struct page *page, int refs)
{
#ifdef CONFIG_DEBUG_VM
if (VM_WARN_ON_ONCE_PAGE(page_ref_count(page) < refs, page))
return;
#endif
/*
* Calling put_page() for each ref is unnecessarily slow. Only the last
* ref needs a put_page().
*/
if (refs > 1)
page_ref_sub(page, refs - 1);
put_page(page);
}
/*
* Return the compound head page with ref appropriately incremented,
* Return the folio with ref appropriately incremented,
* or NULL if that failed.
*/
static inline struct page *try_get_compound_head(struct page *page, int refs)
static inline struct folio *try_get_folio(struct page *page, int refs)
{
struct page *head = compound_head(page);
struct folio *folio;
if (WARN_ON_ONCE(page_ref_count(head) < 0))
retry:
folio = page_folio(page);
if (WARN_ON_ONCE(folio_ref_count(folio) < 0))
return NULL;
if (unlikely(!page_cache_add_speculative(head, refs)))
if (unlikely(!folio_ref_try_add_rcu(folio, refs)))
return NULL;
/*
* At this point we have a stable reference to the head page; but it
* could be that between the compound_head() lookup and the refcount
* increment, the compound page was split, in which case we'd end up
* holding a reference on a page that has nothing to do with the page
* At this point we have a stable reference to the folio; but it
* could be that between calling page_folio() and the refcount
* increment, the folio was split, in which case we'd end up
* holding a reference on a folio that has nothing to do with the page
* we were given anymore.
* So now that the head page is stable, recheck that the pages still
* belong together.
* So now that the folio is stable, recheck that the page still
* belongs to this folio.
*/
if (unlikely(compound_head(page) != head)) {
put_page_refs(head, refs);
return NULL;
if (unlikely(page_folio(page) != folio)) {
folio_put_refs(folio, refs);
goto retry;
}
return head;
return folio;
}
/**
* try_grab_compound_head() - attempt to elevate a page's refcount, by a
* flags-dependent amount.
*
* Even though the name includes "compound_head", this function is still
* appropriate for callers that have a non-compound @page to get.
*
* try_grab_folio() - Attempt to get or pin a folio.
* @page: pointer to page to be grabbed
* @refs: the value to (effectively) add to the page's refcount
* @refs: the value to (effectively) add to the folio's refcount
* @flags: gup flags: these are the FOLL_* flag values.
*
* "grab" names in this file mean, "look at flags to decide whether to use
* FOLL_PIN or FOLL_GET behavior, when incrementing the page's refcount.
* FOLL_PIN or FOLL_GET behavior, when incrementing the folio's refcount.
*
* Either FOLL_PIN or FOLL_GET (or neither) must be set, but not both at the
* same time. (That's true throughout the get_user_pages*() and
* pin_user_pages*() APIs.) Cases:
*
* FOLL_GET: page's refcount will be incremented by @refs.
* FOLL_GET: folio's refcount will be incremented by @refs.
*
* FOLL_PIN on compound pages that are > two pages long: page's refcount will
* be incremented by @refs, and page[2].hpage_pinned_refcount will be
* incremented by @refs * GUP_PIN_COUNTING_BIAS.
* FOLL_PIN on large folios: folio's refcount will be incremented by
* @refs, and its compound_pincount will be incremented by @refs.
*
* FOLL_PIN on normal pages, or compound pages that are two pages long:
* page's refcount will be incremented by @refs * GUP_PIN_COUNTING_BIAS.
* FOLL_PIN on single-page folios: folio's refcount will be incremented by
* @refs * GUP_PIN_COUNTING_BIAS.
*
* Return: head page (with refcount appropriately incremented) for success, or
* NULL upon failure. If neither FOLL_GET nor FOLL_PIN was set, that's
* considered failure, and furthermore, a likely bug in the caller, so a warning
* is also emitted.
* Return: The folio containing @page (with refcount appropriately
* incremented) for success, or NULL upon failure. If neither FOLL_GET
* nor FOLL_PIN was set, that's considered failure, and furthermore,
* a likely bug in the caller, so a warning is also emitted.
*/
__maybe_unused struct page *try_grab_compound_head(struct page *page,
int refs, unsigned int flags)
struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags)
{
if (flags & FOLL_GET)
return try_get_compound_head(page, refs);
return try_get_folio(page, refs);
else if (flags & FOLL_PIN) {
struct folio *folio;
/*
* Can't do FOLL_LONGTERM + FOLL_PIN gup fast path if not in a
* right zone, so fail and let the caller fall back to the slow
@ -143,63 +107,57 @@ __maybe_unused struct page *try_grab_compound_head(struct page *page,
* CAUTION: Don't use compound_head() on the page before this
* point, the result won't be stable.
*/
page = try_get_compound_head(page, refs);
if (!page)
folio = try_get_folio(page, refs);
if (!folio)
return NULL;
/*
* When pinning a compound page of order > 1 (which is what
* hpage_pincount_available() checks for), use an exact count to
* track it, via hpage_pincount_add/_sub().
* When pinning a large folio, use an exact count to track it.
*
* However, be sure to *also* increment the normal page refcount
* field at least once, so that the page really is pinned.
* That's why the refcount from the earlier
* try_get_compound_head() is left intact.
* However, be sure to *also* increment the normal folio
* refcount field at least once, so that the folio really
* is pinned. That's why the refcount from the earlier
* try_get_folio() is left intact.
*/
if (hpage_pincount_available(page))
hpage_pincount_add(page, refs);
if (folio_test_large(folio))
atomic_add(refs, folio_pincount_ptr(folio));
else
page_ref_add(page, refs * (GUP_PIN_COUNTING_BIAS - 1));
folio_ref_add(folio,
refs * (GUP_PIN_COUNTING_BIAS - 1));
node_stat_mod_folio(folio, NR_FOLL_PIN_ACQUIRED, refs);
mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_ACQUIRED,
refs);
return page;
return folio;
}
WARN_ON_ONCE(1);
return NULL;
}
static void put_compound_head(struct page *page, int refs, unsigned int flags)
static void gup_put_folio(struct folio *folio, int refs, unsigned int flags)
{
if (flags & FOLL_PIN) {
mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_RELEASED,
refs);
if (hpage_pincount_available(page))
hpage_pincount_sub(page, refs);
node_stat_mod_folio(folio, NR_FOLL_PIN_RELEASED, refs);
if (folio_test_large(folio))
atomic_sub(refs, folio_pincount_ptr(folio));
else
refs *= GUP_PIN_COUNTING_BIAS;
}
put_page_refs(page, refs);
folio_put_refs(folio, refs);
}
/**
* try_grab_page() - elevate a page's refcount by a flag-dependent amount
* @page: pointer to page to be grabbed
* @flags: gup flags: these are the FOLL_* flag values.
*
* This might not do anything at all, depending on the flags argument.
*
* "grab" names in this file mean, "look at flags to decide whether to use
* FOLL_PIN or FOLL_GET behavior, when incrementing the page's refcount.
*
* @page: pointer to page to be grabbed
* @flags: gup flags: these are the FOLL_* flag values.
*
* Either FOLL_PIN or FOLL_GET (or neither) may be set, but not both at the same
* time. Cases: please see the try_grab_compound_head() documentation, with
* time. Cases: please see the try_grab_folio() documentation, with
* "refs=1".
*
* Return: true for success, or if no action was required (if neither FOLL_PIN
@ -208,32 +166,28 @@ static void put_compound_head(struct page *page, int refs, unsigned int flags)
*/
bool __must_check try_grab_page(struct page *page, unsigned int flags)
{
struct folio *folio = page_folio(page);
WARN_ON_ONCE((flags & (FOLL_GET | FOLL_PIN)) == (FOLL_GET | FOLL_PIN));
if (WARN_ON_ONCE(folio_ref_count(folio) <= 0))
return false;
if (flags & FOLL_GET)
return try_get_page(page);
folio_ref_inc(folio);
else if (flags & FOLL_PIN) {
int refs = 1;
page = compound_head(page);
if (WARN_ON_ONCE(page_ref_count(page) <= 0))
return false;
if (hpage_pincount_available(page))
hpage_pincount_add(page, 1);
else
refs = GUP_PIN_COUNTING_BIAS;
/*
* Similar to try_grab_compound_head(): even if using the
* hpage_pincount_add/_sub() routines, be sure to
* *also* increment the normal page refcount field at least
* once, so that the page really is pinned.
* Similar to try_grab_folio(): be sure to *also*
* increment the normal page refcount field at least once,
* so that the page really is pinned.
*/
page_ref_add(page, refs);
if (folio_test_large(folio)) {
folio_ref_add(folio, 1);
atomic_add(1, folio_pincount_ptr(folio));
} else {
folio_ref_add(folio, GUP_PIN_COUNTING_BIAS);
}
mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_ACQUIRED, 1);
node_stat_mod_folio(folio, NR_FOLL_PIN_ACQUIRED, 1);
}
return true;
@ -250,62 +204,40 @@ bool __must_check try_grab_page(struct page *page, unsigned int flags)
*/
void unpin_user_page(struct page *page)
{
put_compound_head(compound_head(page), 1, FOLL_PIN);
gup_put_folio(page_folio(page), 1, FOLL_PIN);
}
EXPORT_SYMBOL(unpin_user_page);
static inline void compound_range_next(unsigned long i, unsigned long npages,
struct page **list, struct page **head,
unsigned int *ntails)
static inline struct folio *gup_folio_range_next(struct page *start,
unsigned long npages, unsigned long i, unsigned int *ntails)
{
struct page *next, *page;
struct page *next = nth_page(start, i);
struct folio *folio = page_folio(next);
unsigned int nr = 1;
if (i >= npages)
return;
if (folio_test_large(folio))
nr = min_t(unsigned int, npages - i,
folio_nr_pages(folio) - folio_page_idx(folio, next));
next = *list + i;
page = compound_head(next);
if (PageCompound(page) && compound_order(page) >= 1)
nr = min_t(unsigned int,
page + compound_nr(page) - next, npages - i);
*head = page;
*ntails = nr;
return folio;
}
#define for_each_compound_range(__i, __list, __npages, __head, __ntails) \
for (__i = 0, \
compound_range_next(__i, __npages, __list, &(__head), &(__ntails)); \
__i < __npages; __i += __ntails, \
compound_range_next(__i, __npages, __list, &(__head), &(__ntails)))
static inline void compound_next(unsigned long i, unsigned long npages,
struct page **list, struct page **head,
unsigned int *ntails)
static inline struct folio *gup_folio_next(struct page **list,
unsigned long npages, unsigned long i, unsigned int *ntails)
{
struct page *page;
struct folio *folio = page_folio(list[i]);
unsigned int nr;
if (i >= npages)
return;
page = compound_head(list[i]);
for (nr = i + 1; nr < npages; nr++) {
if (compound_head(list[nr]) != page)
if (page_folio(list[nr]) != folio)
break;
}
*head = page;
*ntails = nr - i;
return folio;
}
#define for_each_compound_head(__i, __list, __npages, __head, __ntails) \
for (__i = 0, \
compound_next(__i, __npages, __list, &(__head), &(__ntails)); \
__i < __npages; __i += __ntails, \
compound_next(__i, __npages, __list, &(__head), &(__ntails)))
/**
* unpin_user_pages_dirty_lock() - release and optionally dirty gup-pinned pages
* @pages: array of pages to be maybe marked dirty, and definitely released.
@ -331,16 +263,17 @@ static inline void compound_next(unsigned long i, unsigned long npages,
void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
bool make_dirty)
{
unsigned long index;
struct page *head;
unsigned int ntails;
unsigned long i;
struct folio *folio;
unsigned int nr;
if (!make_dirty) {
unpin_user_pages(pages, npages);
return;
}
for_each_compound_head(index, pages, npages, head, ntails) {
for (i = 0; i < npages; i += nr) {
folio = gup_folio_next(pages, npages, i, &nr);
/*
* Checking PageDirty at this point may race with
* clear_page_dirty_for_io(), but that's OK. Two key
@ -361,9 +294,12 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
* written back, so it gets written back again in the
* next writeback cycle. This is harmless.
*/
if (!PageDirty(head))
set_page_dirty_lock(head);
put_compound_head(head, ntails, FOLL_PIN);
if (!folio_test_dirty(folio)) {
folio_lock(folio);
folio_mark_dirty(folio);
folio_unlock(folio);
}
gup_put_folio(folio, nr, FOLL_PIN);
}
}
EXPORT_SYMBOL(unpin_user_pages_dirty_lock);
@ -392,14 +328,18 @@ EXPORT_SYMBOL(unpin_user_pages_dirty_lock);
void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages,
bool make_dirty)
{
unsigned long index;
struct page *head;
unsigned int ntails;
unsigned long i;
struct folio *folio;
unsigned int nr;
for_each_compound_range(index, &page, npages, head, ntails) {
if (make_dirty && !PageDirty(head))
set_page_dirty_lock(head);
put_compound_head(head, ntails, FOLL_PIN);
for (i = 0; i < npages; i += nr) {
folio = gup_folio_range_next(page, npages, i, &nr);
if (make_dirty && !folio_test_dirty(folio)) {
folio_lock(folio);
folio_mark_dirty(folio);
folio_unlock(folio);
}
gup_put_folio(folio, nr, FOLL_PIN);
}
}
EXPORT_SYMBOL(unpin_user_page_range_dirty_lock);
@ -415,9 +355,9 @@ EXPORT_SYMBOL(unpin_user_page_range_dirty_lock);
*/
void unpin_user_pages(struct page **pages, unsigned long npages)
{
unsigned long index;
struct page *head;
unsigned int ntails;
unsigned long i;
struct folio *folio;
unsigned int nr;
/*
* If this WARN_ON() fires, then the system *might* be leaking pages (by
@ -427,8 +367,10 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
if (WARN_ON(IS_ERR_VALUE(npages)))
return;
for_each_compound_head(index, pages, npages, head, ntails)
put_compound_head(head, ntails, FOLL_PIN);
for (i = 0; i < npages; i += nr) {
folio = gup_folio_next(pages, npages, i, &nr);
gup_put_folio(folio, nr, FOLL_PIN);
}
}
EXPORT_SYMBOL(unpin_user_pages);
@ -593,32 +535,6 @@ static struct page *follow_page_pte(struct vm_area_struct *vma,
*/
mark_page_accessed(page);
}
if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
/* Do not mlock pte-mapped THP */
if (PageTransCompound(page))
goto out;
/*
* The preliminary mapping check is mainly to avoid the
* pointless overhead of lock_page on the ZERO_PAGE
* which might bounce very badly if there is contention.
*
* If the page is already locked, we don't need to
* handle it now - vmscan will handle it later if and
* when it attempts to reclaim the page.
*/
if (page->mapping && trylock_page(page)) {
lru_add_drain(); /* push cached pages to LRU */
/*
* Because we lock page here, and migration is
* blocked by the pte's page reference, and we
* know the page is still mapped, we don't even
* need to check for file-cache page truncation.
*/
mlock_vma_page(page);
unlock_page(page);
}
}
out:
pte_unmap_unlock(ptep, ptl);
return page;
@ -941,9 +857,6 @@ static int faultin_page(struct vm_area_struct *vma,
unsigned int fault_flags = 0;
vm_fault_t ret;
/* mlock all present pages, but do not fault in new pages */
if ((*flags & (FOLL_POPULATE | FOLL_MLOCK)) == FOLL_MLOCK)
return -ENOENT;
if (*flags & FOLL_NOFAULT)
return -EFAULT;
if (*flags & FOLL_WRITE)
@ -1194,8 +1107,6 @@ static long __get_user_pages(struct mm_struct *mm,
case -ENOMEM:
case -EHWPOISON:
goto out;
case -ENOENT:
goto next_page;
}
BUG();
} else if (PTR_ERR(page) == -EEXIST) {
@ -1500,9 +1411,14 @@ long populate_vma_page_range(struct vm_area_struct *vma,
VM_BUG_ON_VMA(end > vma->vm_end, vma);
mmap_assert_locked(mm);
gup_flags = FOLL_TOUCH | FOLL_POPULATE | FOLL_MLOCK;
/*
* Rightly or wrongly, the VM_LOCKONFAULT case has never used
* faultin_page() to break COW, so it has no work to do here.
*/
if (vma->vm_flags & VM_LOCKONFAULT)
gup_flags &= ~FOLL_POPULATE;
return nr_pages;
gup_flags = FOLL_TOUCH;
/*
* We want to touch writable mappings with a write fault in order
* to break COW, except for shared mappings because these don't COW
@ -1569,10 +1485,9 @@ long faultin_vma_page_range(struct vm_area_struct *vma, unsigned long start,
* in the page table.
* FOLL_HWPOISON: Return -EHWPOISON instead of -EFAULT when we hit
* a poisoned page.
* FOLL_POPULATE: Always populate memory with VM_LOCKONFAULT.
* !FOLL_FORCE: Require proper access permissions.
*/
gup_flags = FOLL_TOUCH | FOLL_POPULATE | FOLL_MLOCK | FOLL_HWPOISON;
gup_flags = FOLL_TOUCH | FOLL_HWPOISON;
if (write)
gup_flags |= FOLL_WRITE;
@ -1852,72 +1767,80 @@ static long check_and_migrate_movable_pages(unsigned long nr_pages,
struct page **pages,
unsigned int gup_flags)
{
unsigned long i;
unsigned long isolation_error_count = 0;
bool drain_allow = true;
unsigned long isolation_error_count = 0, i;
struct folio *prev_folio = NULL;
LIST_HEAD(movable_page_list);
long ret = 0;
struct page *prev_head = NULL;
struct page *head;
struct migration_target_control mtc = {
.nid = NUMA_NO_NODE,
.gfp_mask = GFP_USER | __GFP_NOWARN,
};
bool drain_allow = true;
int ret = 0;
for (i = 0; i < nr_pages; i++) {
head = compound_head(pages[i]);
if (head == prev_head)
continue;
prev_head = head;
/*
* If we get a movable page, since we are going to be pinning
* these entries, try to move them out if possible.
*/
if (!is_pinnable_page(head)) {
if (PageHuge(head)) {
if (!isolate_huge_page(head, &movable_page_list))
isolation_error_count++;
} else {
if (!PageLRU(head) && drain_allow) {
lru_add_drain_all();
drain_allow = false;
}
struct folio *folio = page_folio(pages[i]);
if (isolate_lru_page(head)) {
isolation_error_count++;
continue;
}
list_add_tail(&head->lru, &movable_page_list);
mod_node_page_state(page_pgdat(head),
NR_ISOLATED_ANON +
page_is_file_lru(head),
thp_nr_pages(head));
}
if (folio == prev_folio)
continue;
prev_folio = folio;
if (folio_is_pinnable(folio))
continue;
/*
* Try to move out any movable page before pinning the range.
*/
if (folio_test_hugetlb(folio)) {
if (!isolate_huge_page(&folio->page,
&movable_page_list))
isolation_error_count++;
continue;
}
if (!folio_test_lru(folio) && drain_allow) {
lru_add_drain_all();
drain_allow = false;
}
if (folio_isolate_lru(folio)) {
isolation_error_count++;
continue;
}
list_add_tail(&folio->lru, &movable_page_list);
node_stat_mod_folio(folio,
NR_ISOLATED_ANON + folio_is_file_lru(folio),
folio_nr_pages(folio));
}
if (!list_empty(&movable_page_list) || isolation_error_count)
goto unpin_pages;
/*
* If list is empty, and no isolation errors, means that all pages are
* in the correct zone.
*/
if (list_empty(&movable_page_list) && !isolation_error_count)
return nr_pages;
return nr_pages;
unpin_pages:
if (gup_flags & FOLL_PIN) {
unpin_user_pages(pages, nr_pages);
} else {
for (i = 0; i < nr_pages; i++)
put_page(pages[i]);
}
if (!list_empty(&movable_page_list)) {
struct migration_target_control mtc = {
.nid = NUMA_NO_NODE,
.gfp_mask = GFP_USER | __GFP_NOWARN,
};
ret = migrate_pages(&movable_page_list, alloc_migration_target,
NULL, (unsigned long)&mtc, MIGRATE_SYNC,
MR_LONGTERM_PIN, NULL);
if (ret && !list_empty(&movable_page_list))
putback_movable_pages(&movable_page_list);
if (ret > 0) /* number of pages not migrated */
ret = -ENOMEM;
}
return ret > 0 ? -ENOMEM : ret;
if (ret && !list_empty(&movable_page_list))
putback_movable_pages(&movable_page_list);
return ret;
}
#else
static long check_and_migrate_movable_pages(unsigned long nr_pages,
@ -2227,7 +2150,8 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
ptem = ptep = pte_offset_map(&pmd, addr);
do {
pte_t pte = ptep_get_lockless(ptep);
struct page *head, *page;
struct page *page;
struct folio *folio;
/*
* Similar to the PMD case below, NUMA hinting must take slow
@ -2254,22 +2178,20 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
page = pte_page(pte);
head = try_grab_compound_head(page, 1, flags);
if (!head)
folio = try_grab_folio(page, 1, flags);
if (!folio)
goto pte_unmap;
if (unlikely(page_is_secretmem(page))) {
put_compound_head(head, 1, flags);
gup_put_folio(folio, 1, flags);
goto pte_unmap;
}
if (unlikely(pte_val(pte) != pte_val(*ptep))) {
put_compound_head(head, 1, flags);
gup_put_folio(folio, 1, flags);
goto pte_unmap;
}
VM_BUG_ON_PAGE(compound_head(page) != head, page);
/*
* We need to make the page accessible if and only if we are
* going to access its content (the FOLL_PIN case). Please
@ -2279,14 +2201,13 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
if (flags & FOLL_PIN) {
ret = arch_make_page_accessible(page);
if (ret) {
unpin_user_page(page);
gup_put_folio(folio, 1, flags);
goto pte_unmap;
}
}
SetPageReferenced(page);
folio_set_referenced(folio);
pages[*nr] = page;
(*nr)++;
} while (ptep++, addr += PAGE_SIZE, addr != end);
ret = 1;
@ -2403,8 +2324,8 @@ static int record_subpages(struct page *page, unsigned long addr,
{
int nr;
for (nr = 0; addr != end; addr += PAGE_SIZE)
pages[nr++] = page++;
for (nr = 0; addr != end; nr++, addr += PAGE_SIZE)
pages[nr] = nth_page(page, nr);
return nr;
}
@ -2422,7 +2343,8 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
struct page **pages, int *nr)
{
unsigned long pte_end;
struct page *head, *page;
struct page *page;
struct folio *folio;
pte_t pte;
int refs;
@ -2438,21 +2360,20 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
/* hugepages are never "special" */
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
head = pte_page(pte);
page = head + ((addr & (sz-1)) >> PAGE_SHIFT);
page = nth_page(pte_page(pte), (addr & (sz - 1)) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
head = try_grab_compound_head(head, refs, flags);
if (!head)
folio = try_grab_folio(page, refs, flags);
if (!folio)
return 0;
if (unlikely(pte_val(pte) != pte_val(*ptep))) {
put_compound_head(head, refs, flags);
gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
SetPageReferenced(head);
folio_set_referenced(folio);
return 1;
}
@ -2486,7 +2407,8 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
unsigned long end, unsigned int flags,
struct page **pages, int *nr)
{
struct page *head, *page;
struct page *page;
struct folio *folio;
int refs;
if (!pmd_access_permitted(orig, flags & FOLL_WRITE))
@ -2499,20 +2421,20 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
pages, nr);
}
page = pmd_page(orig) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
page = nth_page(pmd_page(orig), (addr & ~PMD_MASK) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
head = try_grab_compound_head(pmd_page(orig), refs, flags);
if (!head)
folio = try_grab_folio(page, refs, flags);
if (!folio)
return 0;
if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) {
put_compound_head(head, refs, flags);
gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
SetPageReferenced(head);
folio_set_referenced(folio);
return 1;
}
@ -2520,7 +2442,8 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
unsigned long end, unsigned int flags,
struct page **pages, int *nr)
{
struct page *head, *page;
struct page *page;
struct folio *folio;
int refs;
if (!pud_access_permitted(orig, flags & FOLL_WRITE))
@ -2533,20 +2456,20 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
pages, nr);
}
page = pud_page(orig) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
page = nth_page(pud_page(orig), (addr & ~PUD_MASK) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
head = try_grab_compound_head(pud_page(orig), refs, flags);
if (!head)
folio = try_grab_folio(page, refs, flags);
if (!folio)
return 0;
if (unlikely(pud_val(orig) != pud_val(*pudp))) {
put_compound_head(head, refs, flags);
gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
SetPageReferenced(head);
folio_set_referenced(folio);
return 1;
}
@ -2555,27 +2478,28 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr,
struct page **pages, int *nr)
{
int refs;
struct page *head, *page;
struct page *page;
struct folio *folio;
if (!pgd_access_permitted(orig, flags & FOLL_WRITE))
return 0;
BUILD_BUG_ON(pgd_devmap(orig));
page = pgd_page(orig) + ((addr & ~PGDIR_MASK) >> PAGE_SHIFT);
page = nth_page(pgd_page(orig), (addr & ~PGDIR_MASK) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);
head = try_grab_compound_head(pgd_page(orig), refs, flags);
if (!head)
folio = try_grab_folio(page, refs, flags);
if (!folio)
return 0;
if (unlikely(pgd_val(orig) != pgd_val(*pgdp))) {
put_compound_head(head, refs, flags);
gup_put_folio(folio, refs, flags);
return 0;
}
*nr += refs;
SetPageReferenced(head);
folio_set_referenced(folio);
return 1;
}

178
mm/huge_memory.c
View File

@ -583,13 +583,10 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long ret;
loff_t off = (loff_t)pgoff << PAGE_SHIFT;
if (!IS_DAX(filp->f_mapping->host) || !IS_ENABLED(CONFIG_FS_DAX_PMD))
goto out;
ret = __thp_get_unmapped_area(filp, addr, len, off, flags, PMD_SIZE);
if (ret)
return ret;
out:
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
}
EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
@ -1381,39 +1378,6 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
if (flags & FOLL_TOUCH)
touch_pmd(vma, addr, pmd, flags);
if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
/*
* We don't mlock() pte-mapped THPs. This way we can avoid
* leaking mlocked pages into non-VM_LOCKED VMAs.
*
* For anon THP:
*
* In most cases the pmd is the only mapping of the page as we
* break COW for the mlock() -- see gup_flags |= FOLL_WRITE for
* writable private mappings in populate_vma_page_range().
*
* The only scenario when we have the page shared here is if we
* mlocking read-only mapping shared over fork(). We skip
* mlocking such pages.
*
* For file THP:
*
* We can expect PageDoubleMap() to be stable under page lock:
* for file pages we set it in page_add_file_rmap(), which
* requires page to be locked.
*/
if (PageAnon(page) && compound_mapcount(page) != 1)
goto skip_mlock;
if (PageDoubleMap(page) || !page->mapping)
goto skip_mlock;
if (!trylock_page(page))
goto skip_mlock;
if (page->mapping && !PageDoubleMap(page))
mlock_vma_page(page);
unlock_page(page);
}
skip_mlock:
page += (addr & ~HPAGE_PMD_MASK) >> PAGE_SHIFT;
VM_BUG_ON_PAGE(!PageCompound(page) && !is_zone_device_page(page), page);
@ -1611,7 +1575,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (pmd_present(orig_pmd)) {
page = pmd_page(orig_pmd);
page_remove_rmap(page, true);
page_remove_rmap(page, vma, true);
VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
VM_BUG_ON_PAGE(!PageHead(page), page);
} else if (thp_migration_supported()) {
@ -2007,7 +1971,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
set_page_dirty(page);
if (!PageReferenced(page) && pmd_young(old_pmd))
SetPageReferenced(page);
page_remove_rmap(page, true);
page_remove_rmap(page, vma, true);
put_page(page);
}
add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR);
@ -2141,6 +2105,9 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
}
}
unlock_page_memcg(page);
/* Above is effectively page_remove_rmap(page, vma, true) */
munlock_vma_page(page, vma, true);
}
smp_wmb(); /* make pte visible before pmd */
@ -2148,18 +2115,18 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
if (freeze) {
for (i = 0; i < HPAGE_PMD_NR; i++) {
page_remove_rmap(page + i, false);
page_remove_rmap(page + i, vma, false);
put_page(page + i);
}
}
}
void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long address, bool freeze, struct page *page)
unsigned long address, bool freeze, struct folio *folio)
{
spinlock_t *ptl;
struct mmu_notifier_range range;
bool do_unlock_page = false;
bool do_unlock_folio = false;
pmd_t _pmd;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
@ -2169,20 +2136,20 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
ptl = pmd_lock(vma->vm_mm, pmd);
/*
* If caller asks to setup a migration entries, we need a page to check
* pmd against. Otherwise we can end up replacing wrong page.
* If caller asks to setup a migration entry, we need a folio to check
* pmd against. Otherwise we can end up replacing wrong folio.
*/
VM_BUG_ON(freeze && !page);
if (page) {
VM_WARN_ON_ONCE(!PageLocked(page));
if (page != pmd_page(*pmd))
VM_BUG_ON(freeze && !folio);
if (folio) {
VM_WARN_ON_ONCE(!folio_test_locked(folio));
if (folio != page_folio(pmd_page(*pmd)))
goto out;
}
repeat:
if (pmd_trans_huge(*pmd)) {
if (!page) {
page = pmd_page(*pmd);
if (!folio) {
folio = page_folio(pmd_page(*pmd));
/*
* An anonymous page must be locked, to ensure that a
* concurrent reuse_swap_page() sees stable mapcount;
@ -2190,33 +2157,31 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
* and page lock must not be taken when zap_pmd_range()
* calls __split_huge_pmd() while i_mmap_lock is held.
*/
if (PageAnon(page)) {
if (unlikely(!trylock_page(page))) {
get_page(page);
if (folio_test_anon(folio)) {
if (unlikely(!folio_trylock(folio))) {
folio_get(folio);
_pmd = *pmd;
spin_unlock(ptl);
lock_page(page);
folio_lock(folio);
spin_lock(ptl);
if (unlikely(!pmd_same(*pmd, _pmd))) {
unlock_page(page);
put_page(page);
page = NULL;
folio_unlock(folio);
folio_put(folio);
folio = NULL;
goto repeat;
}
put_page(page);
folio_put(folio);
}
do_unlock_page = true;
do_unlock_folio = true;
}
}
if (PageMlocked(page))
clear_page_mlock(page);
} else if (!(pmd_devmap(*pmd) || is_pmd_migration_entry(*pmd)))
goto out;
__split_huge_pmd_locked(vma, pmd, range.start, freeze);
out:
spin_unlock(ptl);
if (do_unlock_page)
unlock_page(page);
if (do_unlock_folio)
folio_unlock(folio);
/*
* No need to double call mmu_notifier->invalidate_range() callback.
* They are 3 cases to consider inside __split_huge_pmd_locked():
@ -2234,7 +2199,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
}
void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
bool freeze, struct page *page)
bool freeze, struct folio *folio)
{
pgd_t *pgd;
p4d_t *p4d;
@ -2255,7 +2220,7 @@ void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
pmd = pmd_offset(pud, address);
__split_huge_pmd(vma, pmd, address, freeze, page);
__split_huge_pmd(vma, pmd, address, freeze, folio);
}
static inline void split_huge_pmd_if_needed(struct vm_area_struct *vma, unsigned long address)
@ -2295,6 +2260,7 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma,
static void unmap_page(struct page *page)
{
struct folio *folio = page_folio(page);
enum ttu_flags ttu_flags = TTU_RMAP_LOCKED | TTU_SPLIT_HUGE_PMD |
TTU_SYNC;
@ -2305,26 +2271,27 @@ static void unmap_page(struct page *page)
* pages can simply be left unmapped, then faulted back on demand.
* If that is ever changed (perhaps for mlock), update remap_page().
*/
if (PageAnon(page))
try_to_migrate(page, ttu_flags);
if (folio_test_anon(folio))
try_to_migrate(folio, ttu_flags);
else
try_to_unmap(page, ttu_flags | TTU_IGNORE_MLOCK);
try_to_unmap(folio, ttu_flags | TTU_IGNORE_MLOCK);
VM_WARN_ON_ONCE_PAGE(page_mapped(page), page);
}
static void remap_page(struct page *page, unsigned int nr)
static void remap_page(struct folio *folio, unsigned long nr)
{
int i;
int i = 0;
/* If unmap_page() uses try_to_migrate() on file, remove this check */
if (!PageAnon(page))
if (!folio_test_anon(folio))
return;
if (PageTransHuge(page)) {
remove_migration_ptes(page, page, true);
} else {
for (i = 0; i < nr; i++)
remove_migration_ptes(page + i, page + i, true);
for (;;) {
remove_migration_ptes(folio, folio, true);
i += folio_nr_pages(folio);
if (i >= nr)
break;
folio = folio_next(folio);
}
}
@ -2344,8 +2311,11 @@ static void lru_add_page_tail(struct page *head, struct page *tail,
} else {
/* head is still on lru (and we have it frozen) */
VM_WARN_ON(!PageLRU(head));
if (PageUnevictable(tail))
tail->mlock_count = 0;
else
list_add_tail(&tail->lru, &head->lru);
SetPageLRU(tail);
list_add_tail(&tail->lru, &head->lru);
}
}
@ -2481,7 +2451,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
}
local_irq_enable();
remap_page(head, nr);
remap_page(folio, nr);
if (PageSwapCache(head)) {
swp_entry_t entry = { .val = page_private(head) };
@ -2506,30 +2476,6 @@ static void __split_huge_page(struct page *page, struct list_head *list,
}
}
int total_mapcount(struct page *page)
{
int i, compound, nr, ret;
VM_BUG_ON_PAGE(PageTail(page), page);
if (likely(!PageCompound(page)))
return atomic_read(&page->_mapcount) + 1;
compound = compound_mapcount(page);
nr = compound_nr(page);
if (PageHuge(page))
return compound;
ret = compound;
for (i = 0; i < nr; i++)
ret += atomic_read(&page[i]._mapcount) + 1;
/* File pages has compound_mapcount included in _mapcount */
if (!PageAnon(page))
return ret - compound * nr;
if (PageDoubleMap(page))
ret -= nr;
return ret;
}
/*
* This calculates accurately how many mappings a transparent hugepage
* has (unlike page_mapcount() which isn't fully accurate). This full
@ -2579,18 +2525,19 @@ int page_trans_huge_mapcount(struct page *page)
}
/* Racy check whether the huge page can be split */
bool can_split_huge_page(struct page *page, int *pextra_pins)
bool can_split_folio(struct folio *folio, int *pextra_pins)
{
int extra_pins;
/* Additional pins from page cache */
if (PageAnon(page))
extra_pins = PageSwapCache(page) ? thp_nr_pages(page) : 0;
if (folio_test_anon(folio))
extra_pins = folio_test_swapcache(folio) ?
folio_nr_pages(folio) : 0;
else
extra_pins = thp_nr_pages(page);
extra_pins = folio_nr_pages(folio);
if (pextra_pins)
*pextra_pins = extra_pins;
return total_mapcount(page) == page_count(page) - extra_pins - 1;
return folio_mapcount(folio) == folio_ref_count(folio) - extra_pins - 1;
}
/*
@ -2614,7 +2561,8 @@ bool can_split_huge_page(struct page *page, int *pextra_pins)
*/
int split_huge_page_to_list(struct page *page, struct list_head *list)
{
struct page *head = compound_head(page);
struct folio *folio = page_folio(page);
struct page *head = &folio->page;
struct deferred_split *ds_queue = get_deferred_split_queue(head);
XA_STATE(xas, &head->mapping->i_pages, head->index);
struct anon_vma *anon_vma = NULL;
@ -2634,7 +2582,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
* The caller does not necessarily hold an mmap_lock that would
* prevent the anon_vma disappearing so we first we take a
* reference to it and then lock the anon_vma for write. This
* is similar to page_lock_anon_vma_read except the write lock
* is similar to folio_lock_anon_vma_read except the write lock
* is taken to serialise against parallel split or collapse
* operations.
*/
@ -2681,7 +2629,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
* Racy check if we can split the page, before unmap_page() will
* split PMDs
*/
if (!can_split_huge_page(head, &extra_pins)) {
if (!can_split_folio(folio, &extra_pins)) {
ret = -EBUSY;
goto out_unlock;
}
@ -2731,7 +2679,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
if (mapping)
xas_unlock(&xas);
local_irq_enable();
remap_page(head, thp_nr_pages(head));
remap_page(folio, folio_nr_pages(folio));
ret = -EBUSY;
}
@ -2988,7 +2936,7 @@ static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
goto next;
total++;
if (!can_split_huge_page(compound_head(page), NULL))
if (!can_split_folio(page_folio(page), NULL))
goto next;
if (!trylock_page(page))
@ -3181,7 +3129,7 @@ void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
if (pmd_soft_dirty(pmdval))
pmdswp = pmd_swp_mksoft_dirty(pmdswp);
set_pmd_at(mm, address, pvmw->pmd, pmdswp);
page_remove_rmap(page, true);
page_remove_rmap(page, vma, true);
put_page(page);
}
@ -3210,10 +3158,8 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
if (PageAnon(new))
page_add_anon_rmap(new, vma, mmun_start, true);
else
page_add_file_rmap(new, true);
page_add_file_rmap(new, vma, true);
set_pmd_at(mm, mmun_start, pvmw->pmd, pmde);
if ((vma->vm_flags & VM_LOCKED) && !PageDoubleMap(new))
mlock_vma_page(new);
/* No need to invalidate - it was non-present before */
update_mmu_cache_pmd(vma, address, pvmw->pmd);

15
mm/hugetlb.c
View File

@ -1321,7 +1321,9 @@ static void __destroy_compound_gigantic_page(struct page *page,
}
set_compound_order(page, 0);
#ifdef CONFIG_64BIT
page[1].compound_nr = 0;
#endif
__ClearPageHead(page);
}
@ -1813,7 +1815,9 @@ static bool __prep_compound_gigantic_page(struct page *page, unsigned int order,
for (; j < nr_pages; j++, p = mem_map_next(p, page, j))
__ClearPageReserved(p);
set_compound_order(page, 0);
#ifdef CONFIG_64BIT
page[1].compound_nr = 0;
#endif
__ClearPageHead(page);
return false;
}
@ -5013,7 +5017,7 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct
set_page_dirty(page);
hugetlb_count_sub(pages_per_huge_page(h), mm);
page_remove_rmap(page, true);
page_remove_rmap(page, vma, true);
spin_unlock(ptl);
tlb_remove_page_size(tlb, page, huge_page_size(h));
@ -5258,7 +5262,7 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
/* Break COW */
huge_ptep_clear_flush(vma, haddr, ptep);
mmu_notifier_invalidate_range(mm, range.start, range.end);
page_remove_rmap(old_page, true);
page_remove_rmap(old_page, vma, true);
hugepage_add_new_anon_rmap(new_page, vma, haddr);
set_huge_pte_at(mm, haddr, ptep,
make_huge_pte(vma, new_page, 1));
@ -6074,7 +6078,7 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (pages) {
/*
* try_grab_compound_head() should always succeed here,
* try_grab_folio() should always succeed here,
* because: a) we hold the ptl lock, and b) we've just
* checked that the huge page is present in the page
* tables. If the huge page is present, then the tail
@ -6083,9 +6087,8 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
* any way. So this page must be available at this
* point, unless the page refcount overflowed:
*/
if (WARN_ON_ONCE(!try_grab_compound_head(pages[i],
refs,
flags))) {
if (WARN_ON_ONCE(!try_grab_folio(pages[i], refs,
flags))) {
spin_unlock(ptl);
remainder = 0;
err = -ENOMEM;

117
mm/internal.h
View File

@ -10,6 +10,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/rmap.h>
#include <linux/tracepoint-defs.h>
struct folio_batch;
@ -66,24 +67,20 @@ static inline void wake_throttle_isolated(pg_data_t *pgdat)
vm_fault_t do_swap_page(struct vm_fault *vmf);
void folio_rotate_reclaimable(struct folio *folio);
bool __folio_end_writeback(struct folio *folio);
void deactivate_file_folio(struct folio *folio);
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte);
static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
{
return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
}
struct zap_details;
void unmap_page_range(struct mmu_gather *tlb,
struct vm_area_struct *vma,
unsigned long addr, unsigned long end,
struct zap_details *details);
void do_page_cache_ra(struct readahead_control *, unsigned long nr_to_read,
unsigned long lookahead_size);
void page_cache_ra_order(struct readahead_control *, struct file_ra_state *,
unsigned int order);
void force_page_cache_ra(struct readahead_control *, unsigned long nr);
static inline void force_page_cache_readahead(struct address_space *mapping,
struct file *file, pgoff_t index, unsigned long nr_to_read)
@ -100,6 +97,9 @@ void filemap_free_folio(struct address_space *mapping, struct folio *folio);
int truncate_inode_folio(struct address_space *mapping, struct folio *folio);
bool truncate_inode_partial_folio(struct folio *folio, loff_t start,
loff_t end);
long invalidate_inode_page(struct page *page);
unsigned long invalidate_mapping_pagevec(struct address_space *mapping,
pgoff_t start, pgoff_t end, unsigned long *nr_pagevec);
/**
* folio_evictable - Test whether a folio is evictable.
@ -163,8 +163,10 @@ pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
/*
* in mm/vmscan.c:
*/
extern int isolate_lru_page(struct page *page);
extern void putback_lru_page(struct page *page);
int isolate_lru_page(struct page *page);
int folio_isolate_lru(struct folio *folio);
void putback_lru_page(struct page *page);
void folio_putback_lru(struct folio *folio);
extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason);
/*
@ -396,6 +398,7 @@ static inline bool is_data_mapping(vm_flags_t flags)
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
struct vm_area_struct *prev);
void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
struct anon_vma *folio_anon_vma(struct folio *folio);
#ifdef CONFIG_MMU
void unmap_mapping_folio(struct folio *folio);
@ -404,32 +407,56 @@ extern long populate_vma_page_range(struct vm_area_struct *vma,
extern long faultin_vma_page_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
bool write, int *locked);
extern void munlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
{
munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
}
/*
* must be called with vma's mmap_lock held for read or write, and page locked.
*/
extern void mlock_vma_page(struct page *page);
extern unsigned int munlock_vma_page(struct page *page);
extern int mlock_future_check(struct mm_struct *mm, unsigned long flags,
unsigned long len);
/*
* Clear the page's PageMlocked(). This can be useful in a situation where
* we want to unconditionally remove a page from the pagecache -- e.g.,
* on truncation or freeing.
* mlock_vma_page() and munlock_vma_page():
* should be called with vma's mmap_lock held for read or write,
* under page table lock for the pte/pmd being added or removed.
*
* It is legal to call this function for any page, mlocked or not.
* If called for a page that is still mapped by mlocked vmas, all we do
* is revert to lazy LRU behaviour -- semantics are not broken.
* mlock is usually called at the end of page_add_*_rmap(),
* munlock at the end of page_remove_rmap(); but new anon
* pages are managed by lru_cache_add_inactive_or_unevictable()
* calling mlock_new_page().
*
* @compound is used to include pmd mappings of THPs, but filter out
* pte mappings of THPs, which cannot be consistently counted: a pte
* mapping of the THP head cannot be distinguished by the page alone.
*/
extern void clear_page_mlock(struct page *page);
void mlock_folio(struct folio *folio);
static inline void mlock_vma_folio(struct folio *folio,
struct vm_area_struct *vma, bool compound)
{
/*
* The VM_SPECIAL check here serves two purposes.
* 1) VM_IO check prevents migration from double-counting during mlock.
* 2) Although mmap_region() and mlock_fixup() take care that VM_LOCKED
* is never left set on a VM_SPECIAL vma, there is an interval while
* file->f_op->mmap() is using vm_insert_page(s), when VM_LOCKED may
* still be set while VM_SPECIAL bits are added: so ignore it then.
*/
if (unlikely((vma->vm_flags & (VM_LOCKED|VM_SPECIAL)) == VM_LOCKED) &&
(compound || !folio_test_large(folio)))
mlock_folio(folio);
}
static inline void mlock_vma_page(struct page *page,
struct vm_area_struct *vma, bool compound)
{
mlock_vma_folio(page_folio(page), vma, compound);
}
void munlock_page(struct page *page);
static inline void munlock_vma_page(struct page *page,
struct vm_area_struct *vma, bool compound)
{
if (unlikely(vma->vm_flags & VM_LOCKED) &&
(compound || !PageTransCompound(page)))
munlock_page(page);
}
void mlock_new_page(struct page *page);
bool need_mlock_page_drain(int cpu);
void mlock_page_drain(int cpu);
extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
@ -463,18 +490,20 @@ vma_address(struct page *page, struct vm_area_struct *vma)
}
/*
* Then at what user virtual address will none of the page be found in vma?
* Then at what user virtual address will none of the range be found in vma?
* Assumes that vma_address() already returned a good starting address.
* If page is a compound head, the entire compound page is considered.
*/
static inline unsigned long
vma_address_end(struct page *page, struct vm_area_struct *vma)
static inline unsigned long vma_address_end(struct page_vma_mapped_walk *pvmw)
{
struct vm_area_struct *vma = pvmw->vma;
pgoff_t pgoff;
unsigned long address;
VM_BUG_ON_PAGE(PageKsm(page), page); /* KSM page->index unusable */
pgoff = page_to_pgoff(page) + compound_nr(page);
/* Common case, plus ->pgoff is invalid for KSM */
if (pvmw->nr_pages == 1)
return pvmw->address + PAGE_SIZE;
pgoff = pvmw->pgoff + pvmw->nr_pages;
address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
/* Check for address beyond vma (or wrapped through 0?) */
if (address < vma->vm_start || address > vma->vm_end)
@ -504,8 +533,13 @@ static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
}
#else /* !CONFIG_MMU */
static inline void unmap_mapping_folio(struct folio *folio) { }
static inline void clear_page_mlock(struct page *page) { }
static inline void mlock_vma_page(struct page *page) { }
static inline void mlock_vma_page(struct page *page,
struct vm_area_struct *vma, bool compound) { }
static inline void munlock_vma_page(struct page *page,
struct vm_area_struct *vma, bool compound) { }
static inline void mlock_new_page(struct page *page) { }
static inline bool need_mlock_page_drain(int cpu) { return false; }
static inline void mlock_page_drain(int cpu) { }
static inline void vunmap_range_noflush(unsigned long start, unsigned long end)
{
}
@ -713,6 +747,13 @@ void vunmap_range_noflush(unsigned long start, unsigned long end);
int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
unsigned long addr, int page_nid, int *flags);
void free_zone_device_page(struct page *page);
/*
* mm/gup.c
*/
struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags);
DECLARE_PER_CPU(struct per_cpu_nodestat, boot_nodestats);
#endif /* __MM_INTERNAL_H */

15
mm/khugepaged.c
View File

@ -774,7 +774,7 @@ static void __collapse_huge_page_copy(pte_t *pte, struct page *page,
*/
spin_lock(ptl);
ptep_clear(vma->vm_mm, address, _pte);
page_remove_rmap(src_page, false);
page_remove_rmap(src_page, vma, false);
spin_unlock(ptl);
free_page_and_swap_cache(src_page);
}
@ -1513,7 +1513,7 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr)
if (pte_none(*pte))
continue;
page = vm_normal_page(vma, addr, *pte);
page_remove_rmap(page, false);
page_remove_rmap(page, vma, false);
}
pte_unmap_unlock(start_pte, ptl);
@ -1834,13 +1834,13 @@ static void collapse_file(struct mm_struct *mm,
}
if (page_mapped(page))
unmap_mapping_pages(mapping, index, 1, false);
try_to_unmap(page_folio(page),
TTU_IGNORE_MLOCK | TTU_BATCH_FLUSH);
xas_lock_irq(&xas);
xas_set(&xas, index);
VM_BUG_ON_PAGE(page != xas_load(&xas), page);
VM_BUG_ON_PAGE(page_mapped(page), page);
/*
* The page is expected to have page_count() == 3:
@ -1904,6 +1904,13 @@ static void collapse_file(struct mm_struct *mm,
xas_unlock_irq(&xas);
xa_unlocked:
/*
* If collapse is successful, flush must be done now before copying.
* If collapse is unsuccessful, does flush actually need to be done?
* Do it anyway, to clear the state.
*/
try_to_unmap_flush();
if (result == SCAN_SUCCEED) {
struct page *page, *tmp;

32
mm/ksm.c
View File

@ -1034,10 +1034,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
pte_t *orig_pte)
{
struct mm_struct *mm = vma->vm_mm;
struct page_vma_mapped_walk pvmw = {
.page = page,
.vma = vma,
};
DEFINE_PAGE_VMA_WALK(pvmw, page, vma, 0, 0);
int swapped;
int err = -EFAULT;
struct mmu_notifier_range range;
@ -1177,7 +1174,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
ptep_clear_flush(vma, addr, ptep);
set_pte_at_notify(mm, addr, ptep, newpte);
page_remove_rmap(page, false);
page_remove_rmap(page, vma, false);
if (!page_mapped(page))
try_to_free_swap(page);
put_page(page);
@ -1252,16 +1249,6 @@ static int try_to_merge_one_page(struct vm_area_struct *vma,
err = replace_page(vma, page, kpage, orig_pte);
}
if ((vma->vm_flags & VM_LOCKED) && kpage && !err) {
munlock_vma_page(page);
if (!PageMlocked(kpage)) {
unlock_page(page);
lock_page(kpage);
mlock_vma_page(kpage);
page = kpage; /* for final unlock */
}
}
out_unlock:
unlock_page(page);
out:
@ -2567,7 +2554,8 @@ void __ksm_exit(struct mm_struct *mm)
struct page *ksm_might_need_to_copy(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
struct anon_vma *anon_vma = page_anon_vma(page);
struct folio *folio = page_folio(page);
struct anon_vma *anon_vma = folio_anon_vma(folio);
struct page *new_page;
if (PageKsm(page)) {
@ -2603,21 +2591,21 @@ struct page *ksm_might_need_to_copy(struct page *page,
return new_page;
}
void rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc)
void rmap_walk_ksm(struct folio *folio, const struct rmap_walk_control *rwc)
{
struct stable_node *stable_node;
struct rmap_item *rmap_item;
int search_new_forks = 0;
VM_BUG_ON_PAGE(!PageKsm(page), page);
VM_BUG_ON_FOLIO(!folio_test_ksm(folio), folio);
/*
* Rely on the page lock to protect against concurrent modifications
* to that page's node of the stable tree.
*/
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
stable_node = page_stable_node(page);
stable_node = folio_stable_node(folio);
if (!stable_node)
return;
again:
@ -2652,11 +2640,11 @@ void rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc)
if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg))
continue;
if (!rwc->rmap_one(page, vma, addr, rwc->arg)) {
if (!rwc->rmap_one(folio, vma, addr, rwc->arg)) {
anon_vma_unlock_read(anon_vma);
return;
}
if (rwc->done && rwc->done(page)) {
if (rwc->done && rwc->done(folio)) {
anon_vma_unlock_read(anon_vma);
return;
}

5
mm/madvise.c
View File

@ -502,6 +502,11 @@ static void madvise_cold_page_range(struct mmu_gather *tlb,
tlb_end_vma(tlb, vma);
}
static inline bool can_madv_lru_vma(struct vm_area_struct *vma)
{
return !(vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP));
}
static long madvise_cold(struct vm_area_struct *vma,
struct vm_area_struct **prev,
unsigned long start_addr, unsigned long end_addr)

37
mm/memcontrol.c
View File

@ -53,6 +53,7 @@
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/vmpressure.h>
#include <linux/memremap.h>
#include <linux/mm_inline.h>
#include <linux/swap_cgroup.h>
#include <linux/cpu.h>
@ -1271,8 +1272,7 @@ struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
* @nr_pages: positive when adding or negative when removing
*
* This function must be called under lru_lock, just before a page is added
* to or just after a page is removed from an lru list (that ordering being
* so as to allow it to check that lru_size 0 is consistent with list_empty).
* to or just after a page is removed from an lru list.
*/
void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
int zid, int nr_pages)
@ -5436,17 +5436,12 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
return NULL;
/*
* Handle MEMORY_DEVICE_PRIVATE which are ZONE_DEVICE page belonging to
* a device and because they are not accessible by CPU they are store
* as special swap entry in the CPU page table.
* Handle device private pages that are not accessible by the CPU, but
* stored as special swap entries in the page table.
*/
if (is_device_private_entry(ent)) {
page = pfn_swap_entry_to_page(ent);
/*
* MEMORY_DEVICE_PRIVATE means ZONE_DEVICE page and which have
* a refcount of 1 when free (unlike normal page)
*/
if (!page_ref_add_unless(page, 1, 1))
if (!get_page_unless_zero(page))
return NULL;
return page;
}
@ -7053,19 +7048,19 @@ static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)
/**
* mem_cgroup_swapout - transfer a memsw charge to swap
* @page: page whose memsw charge to transfer
* @folio: folio whose memsw charge to transfer
* @entry: swap entry to move the charge to
*
* Transfer the memsw charge of @page to @entry.
* Transfer the memsw charge of @folio to @entry.
*/
void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry)
{
struct mem_cgroup *memcg, *swap_memcg;
unsigned int nr_entries;
unsigned short oldid;
VM_BUG_ON_PAGE(PageLRU(page), page);
VM_BUG_ON_PAGE(page_count(page), page);
VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
VM_BUG_ON_FOLIO(folio_ref_count(folio), folio);
if (mem_cgroup_disabled())
return;
@ -7073,9 +7068,9 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
return;
memcg = page_memcg(page);
memcg = folio_memcg(folio);
VM_WARN_ON_ONCE_PAGE(!memcg, page);
VM_WARN_ON_ONCE_FOLIO(!memcg, folio);
if (!memcg)
return;
@ -7085,16 +7080,16 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
* ancestor for the swap instead and transfer the memory+swap charge.
*/
swap_memcg = mem_cgroup_id_get_online(memcg);
nr_entries = thp_nr_pages(page);
nr_entries = folio_nr_pages(folio);
/* Get references for the tail pages, too */
if (nr_entries > 1)
mem_cgroup_id_get_many(swap_memcg, nr_entries - 1);
oldid = swap_cgroup_record(entry, mem_cgroup_id(swap_memcg),
nr_entries);
VM_BUG_ON_PAGE(oldid, page);
VM_BUG_ON_FOLIO(oldid, folio);
mod_memcg_state(swap_memcg, MEMCG_SWAP, nr_entries);
page->memcg_data = 0;
folio->memcg_data = 0;
if (!mem_cgroup_is_root(memcg))
page_counter_uncharge(&memcg->memory, nr_entries);
@ -7114,7 +7109,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
memcg_stats_lock();
mem_cgroup_charge_statistics(memcg, -nr_entries);
memcg_stats_unlock();
memcg_check_events(memcg, page_to_nid(page));
memcg_check_events(memcg, folio_nid(folio));
css_put(&memcg->css);
}

12
mm/memory-failure.c
View File

@ -478,12 +478,13 @@ static struct task_struct *task_early_kill(struct task_struct *tsk,
static void collect_procs_anon(struct page *page, struct list_head *to_kill,
int force_early)
{
struct folio *folio = page_folio(page);
struct vm_area_struct *vma;
struct task_struct *tsk;
struct anon_vma *av;
pgoff_t pgoff;
av = page_lock_anon_vma_read(page);
av = folio_lock_anon_vma_read(folio);
if (av == NULL) /* Not actually mapped anymore */
return;
@ -1347,6 +1348,7 @@ static int get_hwpoison_page(struct page *p, unsigned long flags)
static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
int flags, struct page *hpage)
{
struct folio *folio = page_folio(hpage);
enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_SYNC;
struct address_space *mapping;
LIST_HEAD(tokill);
@ -1421,12 +1423,12 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
*/
mapping = hugetlb_page_mapping_lock_write(hpage);
if (mapping) {
try_to_unmap(hpage, ttu|TTU_RMAP_LOCKED);
try_to_unmap(folio, ttu|TTU_RMAP_LOCKED);
i_mmap_unlock_write(mapping);
} else
pr_info("Memory failure: %#lx: could not lock mapping for mapped huge page\n", pfn);
} else {
try_to_unmap(hpage, ttu);
try_to_unmap(folio, ttu);
}
unmap_success = !page_mapped(hpage);
@ -2169,7 +2171,7 @@ static bool isolate_page(struct page *page, struct list_head *pagelist)
*/
static int __soft_offline_page(struct page *page)
{
int ret = 0;
long ret = 0;
unsigned long pfn = page_to_pfn(page);
struct page *hpage = compound_head(page);
char const *msg_page[] = {"page", "hugepage"};
@ -2216,7 +2218,7 @@ static int __soft_offline_page(struct page *page)
if (!list_empty(&pagelist))
putback_movable_pages(&pagelist);
pr_info("soft offline: %#lx: %s migration failed %d, type %pGp\n",
pr_info("soft offline: %#lx: %s migration failed %ld, type %pGp\n",
pfn, msg_page[huge], ret, &page->flags);
if (ret > 0)
ret = -EBUSY;

43
mm/memory.c
View File

@ -735,9 +735,6 @@ static void restore_exclusive_pte(struct vm_area_struct *vma,
set_pte_at(vma->vm_mm, address, ptep, pte);
if (vma->vm_flags & VM_LOCKED)
mlock_vma_page(page);
/*
* No need to invalidate - it was non-present before. However
* secondary CPUs may have mappings that need invalidating.
@ -1389,7 +1386,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
mark_page_accessed(page);
}
rss[mm_counter(page)]--;
page_remove_rmap(page, false);
page_remove_rmap(page, vma, false);
if (unlikely(page_mapcount(page) < 0))
print_bad_pte(vma, addr, ptent, page);
if (unlikely(__tlb_remove_page(tlb, page))) {
@ -1408,7 +1405,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
continue;
rss[mm_counter(page)]--;
if (is_device_private_entry(entry))
page_remove_rmap(page, false);
page_remove_rmap(page, vma, false);
put_page(page);
} else if (!non_swap_entry(entry)) {
/* Genuine swap entry, hence a private anon page */
@ -1763,16 +1760,16 @@ static int validate_page_before_insert(struct page *page)
return 0;
}
static int insert_page_into_pte_locked(struct mm_struct *mm, pte_t *pte,
static int insert_page_into_pte_locked(struct vm_area_struct *vma, pte_t *pte,
unsigned long addr, struct page *page, pgprot_t prot)
{
if (!pte_none(*pte))
return -EBUSY;
/* Ok, finally just insert the thing.. */
get_page(page);
inc_mm_counter_fast(mm, mm_counter_file(page));
page_add_file_rmap(page, false);
set_pte_at(mm, addr, pte, mk_pte(page, prot));
inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
page_add_file_rmap(page, vma, false);
set_pte_at(vma->vm_mm, addr, pte, mk_pte(page, prot));
return 0;
}
@ -1786,7 +1783,6 @@ static int insert_page_into_pte_locked(struct mm_struct *mm, pte_t *pte,
static int insert_page(struct vm_area_struct *vma, unsigned long addr,
struct page *page, pgprot_t prot)
{
struct mm_struct *mm = vma->vm_mm;
int retval;
pte_t *pte;
spinlock_t *ptl;
@ -1795,17 +1791,17 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
if (retval)
goto out;
retval = -ENOMEM;
pte = get_locked_pte(mm, addr, &ptl);
pte = get_locked_pte(vma->vm_mm, addr, &ptl);
if (!pte)
goto out;
retval = insert_page_into_pte_locked(mm, pte, addr, page, prot);
retval = insert_page_into_pte_locked(vma, pte, addr, page, prot);
pte_unmap_unlock(pte, ptl);
out:
return retval;
}
#ifdef pte_index
static int insert_page_in_batch_locked(struct mm_struct *mm, pte_t *pte,
static int insert_page_in_batch_locked(struct vm_area_struct *vma, pte_t *pte,
unsigned long addr, struct page *page, pgprot_t prot)
{
int err;
@ -1815,7 +1811,7 @@ static int insert_page_in_batch_locked(struct mm_struct *mm, pte_t *pte,
err = validate_page_before_insert(page);
if (err)
return err;
return insert_page_into_pte_locked(mm, pte, addr, page, prot);
return insert_page_into_pte_locked(vma, pte, addr, page, prot);
}
/* insert_pages() amortizes the cost of spinlock operations
@ -1852,7 +1848,7 @@ static int insert_pages(struct vm_area_struct *vma, unsigned long addr,
start_pte = pte_offset_map_lock(mm, pmd, addr, &pte_lock);
for (pte = start_pte; pte_idx < batch_size; ++pte, ++pte_idx) {
int err = insert_page_in_batch_locked(mm, pte,
int err = insert_page_in_batch_locked(vma, pte,
addr, pages[curr_page_idx], prot);
if (unlikely(err)) {
pte_unmap_unlock(start_pte, pte_lock);
@ -3108,7 +3104,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
* mapcount is visible. So transitively, TLBs to
* old page will be flushed before it can be reused.
*/
page_remove_rmap(old_page, false);
page_remove_rmap(old_page, vma, false);
}
/* Free the old page.. */
@ -3128,16 +3124,6 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
*/
mmu_notifier_invalidate_range_only_end(&range);
if (old_page) {
/*
* Don't let another task, with possibly unlocked vma,
* keep the mlocked page.
*/
if (page_copied && (vma->vm_flags & VM_LOCKED)) {
lock_page(old_page); /* LRU manipulation */
if (PageMlocked(old_page))
munlock_vma_page(old_page);
unlock_page(old_page);
}
if (page_copied)
free_swap_cache(old_page);
put_page(old_page);
@ -3958,7 +3944,8 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
add_mm_counter(vma->vm_mm, mm_counter_file(page), HPAGE_PMD_NR);
page_add_file_rmap(page, true);
page_add_file_rmap(page, vma, true);
/*
* deposit and withdraw with pmd lock held
*/
@ -4007,7 +3994,7 @@ void do_set_pte(struct vm_fault *vmf, struct page *page, unsigned long addr)
lru_cache_add_inactive_or_unevictable(page, vma);
} else {
inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
page_add_file_rmap(page, false);
page_add_file_rmap(page, vma, false);
}
set_pte_at(vma->vm_mm, addr, vmf->pte, entry);
}

13
mm/memory_hotplug.c
View File

@ -1617,10 +1617,13 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
DEFAULT_RATELIMIT_BURST);
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
struct folio *folio;
if (!pfn_valid(pfn))
continue;
page = pfn_to_page(pfn);
head = compound_head(page);
folio = page_folio(page);
head = &folio->page;
if (PageHuge(page)) {
pfn = page_to_pfn(head) + compound_nr(head) - 1;
@ -1637,10 +1640,10 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
* the unmap as the catch all safety net).
*/
if (PageHWPoison(page)) {
if (WARN_ON(PageLRU(page)))
isolate_lru_page(page);
if (page_mapped(page))
try_to_unmap(page, TTU_IGNORE_MLOCK);
if (WARN_ON(folio_test_lru(folio)))
folio_isolate_lru(folio);
if (folio_mapped(folio))
try_to_unmap(folio, TTU_IGNORE_MLOCK);
continue;
}

65
mm/memremap.c
View File

@ -4,7 +4,7 @@
#include <linux/io.h>
#include <linux/kasan.h>
#include <linux/memory_hotplug.h>
#include <linux/mm.h>
#include <linux/memremap.h>
#include <linux/pfn_t.h>
#include <linux/swap.h>
#include <linux/mmzone.h>
@ -12,6 +12,7 @@
#include <linux/types.h>
#include <linux/wait_bit.h>
#include <linux/xarray.h>
#include "internal.h"
static DEFINE_XARRAY(pgmap_array);
@ -37,21 +38,19 @@ unsigned long memremap_compat_align(void)
EXPORT_SYMBOL_GPL(memremap_compat_align);
#endif
#ifdef CONFIG_DEV_PAGEMAP_OPS
#ifdef CONFIG_FS_DAX
DEFINE_STATIC_KEY_FALSE(devmap_managed_key);
EXPORT_SYMBOL(devmap_managed_key);
static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
{
if (pgmap->type == MEMORY_DEVICE_PRIVATE ||
pgmap->type == MEMORY_DEVICE_FS_DAX)
if (pgmap->type == MEMORY_DEVICE_FS_DAX)
static_branch_dec(&devmap_managed_key);
}
static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
{
if (pgmap->type == MEMORY_DEVICE_PRIVATE ||
pgmap->type == MEMORY_DEVICE_FS_DAX)
if (pgmap->type == MEMORY_DEVICE_FS_DAX)
static_branch_inc(&devmap_managed_key);
}
#else
@ -61,7 +60,7 @@ static void devmap_managed_enable_get(struct dev_pagemap *pgmap)
static void devmap_managed_enable_put(struct dev_pagemap *pgmap)
{
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
#endif /* CONFIG_FS_DAX */
static void pgmap_array_delete(struct range *range)
{
@ -102,23 +101,12 @@ static unsigned long pfn_end(struct dev_pagemap *pgmap, int range_id)
return (range->start + range_len(range)) >> PAGE_SHIFT;
}
static unsigned long pfn_next(struct dev_pagemap *pgmap, unsigned long pfn)
{
if (pfn % (1024 << pgmap->vmemmap_shift))
cond_resched();
return pfn + pgmap_vmemmap_nr(pgmap);
}
static unsigned long pfn_len(struct dev_pagemap *pgmap, unsigned long range_id)
{
return (pfn_end(pgmap, range_id) -
pfn_first(pgmap, range_id)) >> pgmap->vmemmap_shift;
}
#define for_each_device_pfn(pfn, map, i) \
for (pfn = pfn_first(map, i); pfn < pfn_end(map, i); \
pfn = pfn_next(map, pfn))
static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
{
struct range *range = &pgmap->ranges[range_id];
@ -147,13 +135,11 @@ static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
void memunmap_pages(struct dev_pagemap *pgmap)
{
unsigned long pfn;
int i;
percpu_ref_kill(&pgmap->ref);
for (i = 0; i < pgmap->nr_range; i++)
for_each_device_pfn(pfn, pgmap, i)
put_page(pfn_to_page(pfn));
percpu_ref_put_many(&pgmap->ref, pfn_len(pgmap, i));
wait_for_completion(&pgmap->done);
percpu_ref_exit(&pgmap->ref);
@ -329,8 +315,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
}
break;
case MEMORY_DEVICE_FS_DAX:
if (!IS_ENABLED(CONFIG_ZONE_DEVICE) ||
IS_ENABLED(CONFIG_FS_DAX_LIMITED)) {
if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) {
WARN(1, "File system DAX not supported\n");
return ERR_PTR(-EINVAL);
}
@ -466,21 +451,17 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
}
EXPORT_SYMBOL_GPL(get_dev_pagemap);
#ifdef CONFIG_DEV_PAGEMAP_OPS
void free_devmap_managed_page(struct page *page)
void free_zone_device_page(struct page *page)
{
/* notify page idle for dax */
if (!is_device_private_page(page)) {
wake_up_var(&page->_refcount);
if (WARN_ON_ONCE(!page->pgmap->ops || !page->pgmap->ops->page_free))
return;
}
__ClearPageWaiters(page);
mem_cgroup_uncharge(page_folio(page));
/*
* When a device_private page is freed, the page->mapping field
* When a device managed page is freed, the page->mapping field
* may still contain a (stale) mapping value. For example, the
* lower bits of page->mapping may still identify the page as an
* anonymous page. Ultimately, this entire field is just stale
@ -502,5 +483,27 @@ void free_devmap_managed_page(struct page *page)
*/
page->mapping = NULL;
page->pgmap->ops->page_free(page);
/*
* Reset the page count to 1 to prepare for handing out the page again.
*/
set_page_count(page, 1);
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
#ifdef CONFIG_FS_DAX
bool __put_devmap_managed_page(struct page *page)
{
if (page->pgmap->type != MEMORY_DEVICE_FS_DAX)
return false;
/*
* fsdax page refcounts are 1-based, rather than 0-based: if
* refcount is 1, then the page is free and the refcount is
* stable because nobody holds a reference on the page.
*/
if (page_ref_dec_return(page) == 1)
wake_up_var(&page->_refcount);
return true;
}
EXPORT_SYMBOL(__put_devmap_managed_page);
#endif /* CONFIG_FS_DAX */

870
mm/migrate.c
View File

File diff suppressed because it is too large Load Diff

773
mm/migrate_device.c Normal file
View File

@ -0,0 +1,773 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Device Memory Migration functionality.
*
* Originally written by Jérôme Glisse.
*/
#include <linux/export.h>
#include <linux/memremap.h>
#include <linux/migrate.h>
#include <linux/mm_inline.h>
#include <linux/mmu_notifier.h>
#include <linux/oom.h>
#include <linux/pagewalk.h>
#include <linux/rmap.h>
#include <linux/swapops.h>
#include <asm/tlbflush.h>
#include "internal.h"
static int migrate_vma_collect_skip(unsigned long start,
unsigned long end,
struct mm_walk *walk)
{
struct migrate_vma *migrate = walk->private;
unsigned long addr;
for (addr = start; addr < end; addr += PAGE_SIZE) {
migrate->dst[migrate->npages] = 0;
migrate->src[migrate->npages++] = 0;
}
return 0;
}
static int migrate_vma_collect_hole(unsigned long start,
unsigned long end,
__always_unused int depth,
struct mm_walk *walk)
{
struct migrate_vma *migrate = walk->private;
unsigned long addr;
/* Only allow populating anonymous memory. */
if (!vma_is_anonymous(walk->vma))
return migrate_vma_collect_skip(start, end, walk);
for (addr = start; addr < end; addr += PAGE_SIZE) {
migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE;
migrate->dst[migrate->npages] = 0;
migrate->npages++;
migrate->cpages++;
}
return 0;
}
static int migrate_vma_collect_pmd(pmd_t *pmdp,
unsigned long start,
unsigned long end,
struct mm_walk *walk)
{
struct migrate_vma *migrate = walk->private;
struct vm_area_struct *vma = walk->vma;
struct mm_struct *mm = vma->vm_mm;
unsigned long addr = start, unmapped = 0;
spinlock_t *ptl;
pte_t *ptep;
again:
if (pmd_none(*pmdp))
return migrate_vma_collect_hole(start, end, -1, walk);
if (pmd_trans_huge(*pmdp)) {
struct page *page;
ptl = pmd_lock(mm, pmdp);
if (unlikely(!pmd_trans_huge(*pmdp))) {
spin_unlock(ptl);
goto again;
}
page = pmd_page(*pmdp);
if (is_huge_zero_page(page)) {
spin_unlock(ptl);
split_huge_pmd(vma, pmdp, addr);
if (pmd_trans_unstable(pmdp))
return migrate_vma_collect_skip(start, end,
walk);
} else {
int ret;
get_page(page);
spin_unlock(ptl);
if (unlikely(!trylock_page(page)))
return migrate_vma_collect_skip(start, end,
walk);
ret = split_huge_page(page);
unlock_page(page);
put_page(page);
if (ret)
return migrate_vma_collect_skip(start, end,
walk);
if (pmd_none(*pmdp))
return migrate_vma_collect_hole(start, end, -1,
walk);
}
}
if (unlikely(pmd_bad(*pmdp)))
return migrate_vma_collect_skip(start, end, walk);
ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl);
arch_enter_lazy_mmu_mode();
for (; addr < end; addr += PAGE_SIZE, ptep++) {
unsigned long mpfn = 0, pfn;
struct page *page;
swp_entry_t entry;
pte_t pte;
pte = *ptep;
if (pte_none(pte)) {
if (vma_is_anonymous(vma)) {
mpfn = MIGRATE_PFN_MIGRATE;
migrate->cpages++;
}
goto next;
}
if (!pte_present(pte)) {
/*
* Only care about unaddressable device page special
* page table entry. Other special swap entries are not
* migratable, and we ignore regular swapped page.
*/
entry = pte_to_swp_entry(pte);
if (!is_device_private_entry(entry))
goto next;
page = pfn_swap_entry_to_page(entry);
if (!(migrate->flags &
MIGRATE_VMA_SELECT_DEVICE_PRIVATE) ||
page->pgmap->owner != migrate->pgmap_owner)
goto next;
mpfn = migrate_pfn(page_to_pfn(page)) |
MIGRATE_PFN_MIGRATE;
if (is_writable_device_private_entry(entry))
mpfn |= MIGRATE_PFN_WRITE;
} else {
if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM))
goto next;
pfn = pte_pfn(pte);
if (is_zero_pfn(pfn)) {
mpfn = MIGRATE_PFN_MIGRATE;
migrate->cpages++;
goto next;
}
page = vm_normal_page(migrate->vma, addr, pte);
mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE;
mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0;
}
/* FIXME support THP */
if (!page || !page->mapping || PageTransCompound(page)) {
mpfn = 0;
goto next;
}
/*
* By getting a reference on the page we pin it and that blocks
* any kind of migration. Side effect is that it "freezes" the
* pte.
*
* We drop this reference after isolating the page from the lru
* for non device page (device page are not on the lru and thus
* can't be dropped from it).
*/
get_page(page);
/*
* Optimize for the common case where page is only mapped once
* in one process. If we can lock the page, then we can safely
* set up a special migration page table entry now.
*/
if (trylock_page(page)) {
pte_t swp_pte;
migrate->cpages++;
ptep_get_and_clear(mm, addr, ptep);
/* Setup special migration page table entry */
if (mpfn & MIGRATE_PFN_WRITE)
entry = make_writable_migration_entry(
page_to_pfn(page));
else
entry = make_readable_migration_entry(
page_to_pfn(page));
swp_pte = swp_entry_to_pte(entry);
if (pte_present(pte)) {
if (pte_soft_dirty(pte))
swp_pte = pte_swp_mksoft_dirty(swp_pte);
if (pte_uffd_wp(pte))
swp_pte = pte_swp_mkuffd_wp(swp_pte);
} else {
if (pte_swp_soft_dirty(pte))
swp_pte = pte_swp_mksoft_dirty(swp_pte);
if (pte_swp_uffd_wp(pte))
swp_pte = pte_swp_mkuffd_wp(swp_pte);
}
set_pte_at(mm, addr, ptep, swp_pte);
/*
* This is like regular unmap: we remove the rmap and
* drop page refcount. Page won't be freed, as we took
* a reference just above.
*/
page_remove_rmap(page, vma, false);
put_page(page);
if (pte_present(pte))
unmapped++;
} else {
put_page(page);
mpfn = 0;
}
next:
migrate->dst[migrate->npages] = 0;
migrate->src[migrate->npages++] = mpfn;
}
arch_leave_lazy_mmu_mode();
pte_unmap_unlock(ptep - 1, ptl);
/* Only flush the TLB if we actually modified any entries */
if (unmapped)
flush_tlb_range(walk->vma, start, end);
return 0;
}
static const struct mm_walk_ops migrate_vma_walk_ops = {
.pmd_entry = migrate_vma_collect_pmd,
.pte_hole = migrate_vma_collect_hole,
};
/*
* migrate_vma_collect() - collect pages over a range of virtual addresses
* @migrate: migrate struct containing all migration information
*
* This will walk the CPU page table. For each virtual address backed by a
* valid page, it updates the src array and takes a reference on the page, in
* order to pin the page until we lock it and unmap it.
*/
static void migrate_vma_collect(struct migrate_vma *migrate)
{
struct mmu_notifier_range range;
/*
* Note that the pgmap_owner is passed to the mmu notifier callback so
* that the registered device driver can skip invalidating device
* private page mappings that won't be migrated.
*/
mmu_notifier_range_init_owner(&range, MMU_NOTIFY_MIGRATE, 0,
migrate->vma, migrate->vma->vm_mm, migrate->start, migrate->end,
migrate->pgmap_owner);
mmu_notifier_invalidate_range_start(&range);
walk_page_range(migrate->vma->vm_mm, migrate->start, migrate->end,
&migrate_vma_walk_ops, migrate);
mmu_notifier_invalidate_range_end(&range);
migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT);
}
/*
* migrate_vma_check_page() - check if page is pinned or not
* @page: struct page to check
*
* Pinned pages cannot be migrated. This is the same test as in
* folio_migrate_mapping(), except that here we allow migration of a
* ZONE_DEVICE page.
*/
static bool migrate_vma_check_page(struct page *page)
{
/*
* One extra ref because caller holds an extra reference, either from
* isolate_lru_page() for a regular page, or migrate_vma_collect() for
* a device page.
*/
int extra = 1;
/*
* FIXME support THP (transparent huge page), it is bit more complex to
* check them than regular pages, because they can be mapped with a pmd
* or with a pte (split pte mapping).
*/
if (PageCompound(page))
return false;
/* Page from ZONE_DEVICE have one extra reference */
if (is_zone_device_page(page))
extra++;
/* For file back page */
if (page_mapping(page))
extra += 1 + page_has_private(page);
if ((page_count(page) - extra) > page_mapcount(page))
return false;
return true;
}
/*
* migrate_vma_unmap() - replace page mapping with special migration pte entry
* @migrate: migrate struct containing all migration information
*
* Isolate pages from the LRU and replace mappings (CPU page table pte) with a
* special migration pte entry and check if it has been pinned. Pinned pages are
* restored because we cannot migrate them.
*
* This is the last step before we call the device driver callback to allocate
* destination memory and copy contents of original page over to new page.
*/
static void migrate_vma_unmap(struct migrate_vma *migrate)
{
const unsigned long npages = migrate->npages;
unsigned long i, restore = 0;
bool allow_drain = true;
lru_add_drain();
for (i = 0; i < npages; i++) {
struct page *page = migrate_pfn_to_page(migrate->src[i]);
struct folio *folio;
if (!page)
continue;
/* ZONE_DEVICE pages are not on LRU */
if (!is_zone_device_page(page)) {
if (!PageLRU(page) && allow_drain) {
/* Drain CPU's pagevec */
lru_add_drain_all();
allow_drain = false;
}
if (isolate_lru_page(page)) {
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
migrate->cpages--;
restore++;
continue;
}
/* Drop the reference we took in collect */
put_page(page);
}
folio = page_folio(page);
if (folio_mapped(folio))
try_to_migrate(folio, 0);
if (page_mapped(page) || !migrate_vma_check_page(page)) {
if (!is_zone_device_page(page)) {
get_page(page);
putback_lru_page(page);
}
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
migrate->cpages--;
restore++;
continue;
}
}
for (i = 0; i < npages && restore; i++) {
struct page *page = migrate_pfn_to_page(migrate->src[i]);
struct folio *folio;
if (!page || (migrate->src[i] & MIGRATE_PFN_MIGRATE))
continue;
folio = page_folio(page);
remove_migration_ptes(folio, folio, false);
migrate->src[i] = 0;
folio_unlock(folio);
folio_put(folio);
restore--;
}
}
/**
* migrate_vma_setup() - prepare to migrate a range of memory
* @args: contains the vma, start, and pfns arrays for the migration
*
* Returns: negative errno on failures, 0 when 0 or more pages were migrated
* without an error.
*
* Prepare to migrate a range of memory virtual address range by collecting all
* the pages backing each virtual address in the range, saving them inside the
* src array. Then lock those pages and unmap them. Once the pages are locked
* and unmapped, check whether each page is pinned or not. Pages that aren't
* pinned have the MIGRATE_PFN_MIGRATE flag set (by this function) in the
* corresponding src array entry. Then restores any pages that are pinned, by
* remapping and unlocking those pages.
*
* The caller should then allocate destination memory and copy source memory to
* it for all those entries (ie with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE
* flag set). Once these are allocated and copied, the caller must update each
* corresponding entry in the dst array with the pfn value of the destination
* page and with MIGRATE_PFN_VALID. Destination pages must be locked via
* lock_page().
*
* Note that the caller does not have to migrate all the pages that are marked
* with MIGRATE_PFN_MIGRATE flag in src array unless this is a migration from
* device memory to system memory. If the caller cannot migrate a device page
* back to system memory, then it must return VM_FAULT_SIGBUS, which has severe
* consequences for the userspace process, so it must be avoided if at all
* possible.
*
* For empty entries inside CPU page table (pte_none() or pmd_none() is true) we
* do set MIGRATE_PFN_MIGRATE flag inside the corresponding source array thus
* allowing the caller to allocate device memory for those unbacked virtual
* addresses. For this the caller simply has to allocate device memory and
* properly set the destination entry like for regular migration. Note that
* this can still fail, and thus inside the device driver you must check if the
* migration was successful for those entries after calling migrate_vma_pages(),
* just like for regular migration.
*
* After that, the callers must call migrate_vma_pages() to go over each entry
* in the src array that has the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag
* set. If the corresponding entry in dst array has MIGRATE_PFN_VALID flag set,
* then migrate_vma_pages() to migrate struct page information from the source
* struct page to the destination struct page. If it fails to migrate the
* struct page information, then it clears the MIGRATE_PFN_MIGRATE flag in the
* src array.
*
* At this point all successfully migrated pages have an entry in the src
* array with MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set and the dst
* array entry with MIGRATE_PFN_VALID flag set.
*
* Once migrate_vma_pages() returns the caller may inspect which pages were
* successfully migrated, and which were not. Successfully migrated pages will
* have the MIGRATE_PFN_MIGRATE flag set for their src array entry.
*
* It is safe to update device page table after migrate_vma_pages() because
* both destination and source page are still locked, and the mmap_lock is held
* in read mode (hence no one can unmap the range being migrated).
*
* Once the caller is done cleaning up things and updating its page table (if it
* chose to do so, this is not an obligation) it finally calls
* migrate_vma_finalize() to update the CPU page table to point to new pages
* for successfully migrated pages or otherwise restore the CPU page table to
* point to the original source pages.
*/
int migrate_vma_setup(struct migrate_vma *args)
{
long nr_pages = (args->end - args->start) >> PAGE_SHIFT;
args->start &= PAGE_MASK;
args->end &= PAGE_MASK;
if (!args->vma || is_vm_hugetlb_page(args->vma) ||
(args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma))
return -EINVAL;
if (nr_pages <= 0)
return -EINVAL;
if (args->start < args->vma->vm_start ||
args->start >= args->vma->vm_end)
return -EINVAL;
if (args->end <= args->vma->vm_start || args->end > args->vma->vm_end)
return -EINVAL;
if (!args->src || !args->dst)
return -EINVAL;
memset(args->src, 0, sizeof(*args->src) * nr_pages);
args->cpages = 0;
args->npages = 0;
migrate_vma_collect(args);
if (args->cpages)
migrate_vma_unmap(args);
/*
* At this point pages are locked and unmapped, and thus they have
* stable content and can safely be copied to destination memory that
* is allocated by the drivers.
*/
return 0;
}
EXPORT_SYMBOL(migrate_vma_setup);
/*
* This code closely matches the code in:
* __handle_mm_fault()
* handle_pte_fault()
* do_anonymous_page()
* to map in an anonymous zero page but the struct page will be a ZONE_DEVICE
* private page.
*/
static void migrate_vma_insert_page(struct migrate_vma *migrate,
unsigned long addr,
struct page *page,
unsigned long *src)
{
struct vm_area_struct *vma = migrate->vma;
struct mm_struct *mm = vma->vm_mm;
bool flush = false;
spinlock_t *ptl;
pte_t entry;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
/* Only allow populating anonymous memory */
if (!vma_is_anonymous(vma))
goto abort;
pgdp = pgd_offset(mm, addr);
p4dp = p4d_alloc(mm, pgdp, addr);
if (!p4dp)
goto abort;
pudp = pud_alloc(mm, p4dp, addr);
if (!pudp)
goto abort;
pmdp = pmd_alloc(mm, pudp, addr);
if (!pmdp)
goto abort;
if (pmd_trans_huge(*pmdp) || pmd_devmap(*pmdp))
goto abort;
/*
* Use pte_alloc() instead of pte_alloc_map(). We can't run
* pte_offset_map() on pmds where a huge pmd might be created
* from a different thread.
*
* pte_alloc_map() is safe to use under mmap_write_lock(mm) or when
* parallel threads are excluded by other means.
*
* Here we only have mmap_read_lock(mm).
*/
if (pte_alloc(mm, pmdp))
goto abort;
/* See the comment in pte_alloc_one_map() */
if (unlikely(pmd_trans_unstable(pmdp)))
goto abort;
if (unlikely(anon_vma_prepare(vma)))
goto abort;
if (mem_cgroup_charge(page_folio(page), vma->vm_mm, GFP_KERNEL))
goto abort;
/*
* The memory barrier inside __SetPageUptodate makes sure that
* preceding stores to the page contents become visible before
* the set_pte_at() write.
*/
__SetPageUptodate(page);
if (is_device_private_page(page)) {
swp_entry_t swp_entry;
if (vma->vm_flags & VM_WRITE)
swp_entry = make_writable_device_private_entry(
page_to_pfn(page));
else
swp_entry = make_readable_device_private_entry(
page_to_pfn(page));
entry = swp_entry_to_pte(swp_entry);
} else {
/*
* For now we only support migrating to un-addressable device
* memory.
*/
if (is_zone_device_page(page)) {
pr_warn_once("Unsupported ZONE_DEVICE page type.\n");
goto abort;
}
entry = mk_pte(page, vma->vm_page_prot);
if (vma->vm_flags & VM_WRITE)
entry = pte_mkwrite(pte_mkdirty(entry));
}
ptep = pte_offset_map_lock(mm, pmdp, addr, &ptl);
if (check_stable_address_space(mm))
goto unlock_abort;
if (pte_present(*ptep)) {
unsigned long pfn = pte_pfn(*ptep);
if (!is_zero_pfn(pfn))
goto unlock_abort;
flush = true;
} else if (!pte_none(*ptep))
goto unlock_abort;
/*
* Check for userfaultfd but do not deliver the fault. Instead,
* just back off.
*/
if (userfaultfd_missing(vma))
goto unlock_abort;
inc_mm_counter(mm, MM_ANONPAGES);
page_add_new_anon_rmap(page, vma, addr, false);
if (!is_zone_device_page(page))
lru_cache_add_inactive_or_unevictable(page, vma);
get_page(page);
if (flush) {
flush_cache_page(vma, addr, pte_pfn(*ptep));
ptep_clear_flush_notify(vma, addr, ptep);
set_pte_at_notify(mm, addr, ptep, entry);
update_mmu_cache(vma, addr, ptep);
} else {
/* No need to invalidate - it was non-present before */
set_pte_at(mm, addr, ptep, entry);
update_mmu_cache(vma, addr, ptep);
}
pte_unmap_unlock(ptep, ptl);
*src = MIGRATE_PFN_MIGRATE;
return;
unlock_abort:
pte_unmap_unlock(ptep, ptl);
abort:
*src &= ~MIGRATE_PFN_MIGRATE;
}
/**
* migrate_vma_pages() - migrate meta-data from src page to dst page
* @migrate: migrate struct containing all migration information
*
* This migrates struct page meta-data from source struct page to destination
* struct page. This effectively finishes the migration from source page to the
* destination page.
*/
void migrate_vma_pages(struct migrate_vma *migrate)
{
const unsigned long npages = migrate->npages;
const unsigned long start = migrate->start;
struct mmu_notifier_range range;
unsigned long addr, i;
bool notified = false;
for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) {
struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
struct page *page = migrate_pfn_to_page(migrate->src[i]);
struct address_space *mapping;
int r;
if (!newpage) {
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
continue;
}
if (!page) {
if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE))
continue;
if (!notified) {
notified = true;
mmu_notifier_range_init_owner(&range,
MMU_NOTIFY_MIGRATE, 0, migrate->vma,
migrate->vma->vm_mm, addr, migrate->end,
migrate->pgmap_owner);
mmu_notifier_invalidate_range_start(&range);
}
migrate_vma_insert_page(migrate, addr, newpage,
&migrate->src[i]);
continue;
}
mapping = page_mapping(page);
if (is_device_private_page(newpage)) {
/*
* For now only support private anonymous when migrating
* to un-addressable device memory.
*/
if (mapping) {
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
continue;
}
} else if (is_zone_device_page(newpage)) {
/*
* Other types of ZONE_DEVICE page are not supported.
*/
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
continue;
}
r = migrate_page(mapping, newpage, page, MIGRATE_SYNC_NO_COPY);
if (r != MIGRATEPAGE_SUCCESS)
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
}
/*
* No need to double call mmu_notifier->invalidate_range() callback as
* the above ptep_clear_flush_notify() inside migrate_vma_insert_page()
* did already call it.
*/
if (notified)
mmu_notifier_invalidate_range_only_end(&range);
}
EXPORT_SYMBOL(migrate_vma_pages);
/**
* migrate_vma_finalize() - restore CPU page table entry
* @migrate: migrate struct containing all migration information
*
* This replaces the special migration pte entry with either a mapping to the
* new page if migration was successful for that page, or to the original page
* otherwise.
*
* This also unlocks the pages and puts them back on the lru, or drops the extra
* refcount, for device pages.
*/
void migrate_vma_finalize(struct migrate_vma *migrate)
{
const unsigned long npages = migrate->npages;
unsigned long i;
for (i = 0; i < npages; i++) {
struct folio *dst, *src;
struct page *newpage = migrate_pfn_to_page(migrate->dst[i]);
struct page *page = migrate_pfn_to_page(migrate->src[i]);
if (!page) {
if (newpage) {
unlock_page(newpage);
put_page(newpage);
}
continue;
}
if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE) || !newpage) {
if (newpage) {
unlock_page(newpage);
put_page(newpage);
}
newpage = page;
}
src = page_folio(page);
dst = page_folio(newpage);
remove_migration_ptes(src, dst, false);
folio_unlock(src);
if (is_zone_device_page(page))
put_page(page);
else
putback_lru_page(page);
if (newpage != page) {
unlock_page(newpage);
if (is_zone_device_page(newpage))
put_page(newpage);
else
putback_lru_page(newpage);
}
}
}
EXPORT_SYMBOL(migrate_vma_finalize);

670
mm/mlock.c
View File

@ -14,6 +14,7 @@
#include <linux/swapops.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
#include <linux/pagewalk.h>
#include <linux/mempolicy.h>
#include <linux/syscalls.h>
#include <linux/sched.h>
@ -27,6 +28,8 @@
#include "internal.h"
static DEFINE_PER_CPU(struct pagevec, mlock_pvec);
bool can_do_mlock(void)
{
if (rlimit(RLIMIT_MEMLOCK) != 0)
@ -46,441 +49,320 @@ EXPORT_SYMBOL(can_do_mlock);
* be placed on the LRU "unevictable" list, rather than the [in]active lists.
* The unevictable list is an LRU sibling list to the [in]active lists.
* PageUnevictable is set to indicate the unevictable state.
*
* When lazy mlocking via vmscan, it is important to ensure that the
* vma's VM_LOCKED status is not concurrently being modified, otherwise we
* may have mlocked a page that is being munlocked. So lazy mlock must take
* the mmap_lock for read, and verify that the vma really is locked
* (see mm/rmap.c).
*/
/*
* LRU accounting for clear_page_mlock()
*/
void clear_page_mlock(struct page *page)
static struct lruvec *__mlock_page(struct page *page, struct lruvec *lruvec)
{
int nr_pages;
/* There is nothing more we can do while it's off LRU */
if (!TestClearPageLRU(page))
return lruvec;
if (!TestClearPageMlocked(page))
return;
lruvec = folio_lruvec_relock_irq(page_folio(page), lruvec);
nr_pages = thp_nr_pages(page);
mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
count_vm_events(UNEVICTABLE_PGCLEARED, nr_pages);
/*
* The previous TestClearPageMlocked() corresponds to the smp_mb()
* in __pagevec_lru_add_fn().
*
* See __pagevec_lru_add_fn for more explanation.
*/
if (!isolate_lru_page(page)) {
putback_lru_page(page);
} else {
if (unlikely(page_evictable(page))) {
/*
* We lost the race. the page already moved to evictable list.
* This is a little surprising, but quite possible:
* PageMlocked must have got cleared already by another CPU.
* Could this page be on the Unevictable LRU? I'm not sure,
* but move it now if so.
*/
if (PageUnevictable(page))
count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
if (PageUnevictable(page)) {
del_page_from_lru_list(page, lruvec);
ClearPageUnevictable(page);
add_page_to_lru_list(page, lruvec);
__count_vm_events(UNEVICTABLE_PGRESCUED,
thp_nr_pages(page));
}
goto out;
}
}
/*
* Mark page as mlocked if not already.
* If page on LRU, isolate and putback to move to unevictable list.
*/
void mlock_vma_page(struct page *page)
{
/* Serialize with page migration */
BUG_ON(!PageLocked(page));
VM_BUG_ON_PAGE(PageTail(page), page);
VM_BUG_ON_PAGE(PageCompound(page) && PageDoubleMap(page), page);
if (!TestSetPageMlocked(page)) {
int nr_pages = thp_nr_pages(page);
mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
if (!isolate_lru_page(page))
putback_lru_page(page);
if (PageUnevictable(page)) {
if (PageMlocked(page))
page->mlock_count++;
goto out;
}
del_page_from_lru_list(page, lruvec);
ClearPageActive(page);
SetPageUnevictable(page);
page->mlock_count = !!PageMlocked(page);
add_page_to_lru_list(page, lruvec);
__count_vm_events(UNEVICTABLE_PGCULLED, thp_nr_pages(page));
out:
SetPageLRU(page);
return lruvec;
}
/*
* Finish munlock after successful page isolation
*
* Page must be locked. This is a wrapper for page_mlock()
* and putback_lru_page() with munlock accounting.
*/
static void __munlock_isolated_page(struct page *page)
static struct lruvec *__mlock_new_page(struct page *page, struct lruvec *lruvec)
{
/*
* Optimization: if the page was mapped just once, that's our mapping
* and we don't need to check all the other vmas.
*/
if (page_mapcount(page) > 1)
page_mlock(page);
VM_BUG_ON_PAGE(PageLRU(page), page);
/* Did try_to_unlock() succeed or punt? */
if (!PageMlocked(page))
count_vm_events(UNEVICTABLE_PGMUNLOCKED, thp_nr_pages(page));
lruvec = folio_lruvec_relock_irq(page_folio(page), lruvec);
putback_lru_page(page);
/* As above, this is a little surprising, but possible */
if (unlikely(page_evictable(page)))
goto out;
SetPageUnevictable(page);
page->mlock_count = !!PageMlocked(page);
__count_vm_events(UNEVICTABLE_PGCULLED, thp_nr_pages(page));
out:
add_page_to_lru_list(page, lruvec);
SetPageLRU(page);
return lruvec;
}
/*
* Accounting for page isolation fail during munlock
*
* Performs accounting when page isolation fails in munlock. There is nothing
* else to do because it means some other task has already removed the page
* from the LRU. putback_lru_page() will take care of removing the page from
* the unevictable list, if necessary. vmscan [page_referenced()] will move
* the page back to the unevictable list if some other vma has it mlocked.
*/
static void __munlock_isolation_failed(struct page *page)
static struct lruvec *__munlock_page(struct page *page, struct lruvec *lruvec)
{
int nr_pages = thp_nr_pages(page);
bool isolated = false;
if (PageUnevictable(page))
__count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
else
__count_vm_events(UNEVICTABLE_PGMUNLOCKED, nr_pages);
if (!TestClearPageLRU(page))
goto munlock;
isolated = true;
lruvec = folio_lruvec_relock_irq(page_folio(page), lruvec);
if (PageUnevictable(page)) {
/* Then mlock_count is maintained, but might undercount */
if (page->mlock_count)
page->mlock_count--;
if (page->mlock_count)
goto out;
}
/* else assume that was the last mlock: reclaim will fix it if not */
munlock:
if (TestClearPageMlocked(page)) {
__mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
if (isolated || !PageUnevictable(page))
__count_vm_events(UNEVICTABLE_PGMUNLOCKED, nr_pages);
else
__count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
}
/* page_evictable() has to be checked *after* clearing Mlocked */
if (isolated && PageUnevictable(page) && page_evictable(page)) {
del_page_from_lru_list(page, lruvec);
ClearPageUnevictable(page);
add_page_to_lru_list(page, lruvec);
__count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
}
out:
if (isolated)
SetPageLRU(page);
return lruvec;
}
/*
* Flags held in the low bits of a struct page pointer on the mlock_pvec.
*/
#define LRU_PAGE 0x1
#define NEW_PAGE 0x2
static inline struct page *mlock_lru(struct page *page)
{
return (struct page *)((unsigned long)page + LRU_PAGE);
}
static inline struct page *mlock_new(struct page *page)
{
return (struct page *)((unsigned long)page + NEW_PAGE);
}
/*
* mlock_pagevec() is derived from pagevec_lru_move_fn():
* perhaps that can make use of such page pointer flags in future,
* but for now just keep it for mlock. We could use three separate
* pagevecs instead, but one feels better (munlocking a full pagevec
* does not need to drain mlocking pagevecs first).
*/
static void mlock_pagevec(struct pagevec *pvec)
{
struct lruvec *lruvec = NULL;
unsigned long mlock;
struct page *page;
int i;
for (i = 0; i < pagevec_count(pvec); i++) {
page = pvec->pages[i];
mlock = (unsigned long)page & (LRU_PAGE | NEW_PAGE);
page = (struct page *)((unsigned long)page - mlock);
pvec->pages[i] = page;
if (mlock & LRU_PAGE)
lruvec = __mlock_page(page, lruvec);
else if (mlock & NEW_PAGE)
lruvec = __mlock_new_page(page, lruvec);
else
lruvec = __munlock_page(page, lruvec);
}
if (lruvec)
unlock_page_lruvec_irq(lruvec);
release_pages(pvec->pages, pvec->nr);
pagevec_reinit(pvec);
}
void mlock_page_drain(int cpu)
{
struct pagevec *pvec;
pvec = &per_cpu(mlock_pvec, cpu);
if (pagevec_count(pvec))
mlock_pagevec(pvec);
}
bool need_mlock_page_drain(int cpu)
{
return pagevec_count(&per_cpu(mlock_pvec, cpu));
}
/**
* munlock_vma_page - munlock a vma page
* @page: page to be unlocked, either a normal page or THP page head
*
* returns the size of the page as a page mask (0 for normal page,
* HPAGE_PMD_NR - 1 for THP head page)
*
* called from munlock()/munmap() path with page supposedly on the LRU.
* When we munlock a page, because the vma where we found the page is being
* munlock()ed or munmap()ed, we want to check whether other vmas hold the
* page locked so that we can leave it on the unevictable lru list and not
* bother vmscan with it. However, to walk the page's rmap list in
* page_mlock() we must isolate the page from the LRU. If some other
* task has removed the page from the LRU, we won't be able to do that.
* So we clear the PageMlocked as we might not get another chance. If we
* can't isolate the page, we leave it for putback_lru_page() and vmscan
* [page_referenced()/try_to_unmap()] to deal with.
* mlock_folio - mlock a folio already on (or temporarily off) LRU
* @folio: folio to be mlocked.
*/
unsigned int munlock_vma_page(struct page *page)
void mlock_folio(struct folio *folio)
{
int nr_pages;
struct pagevec *pvec = &get_cpu_var(mlock_pvec);
/* For page_mlock() and to serialize with page migration */
BUG_ON(!PageLocked(page));
VM_BUG_ON_PAGE(PageTail(page), page);
if (!folio_test_set_mlocked(folio)) {
int nr_pages = folio_nr_pages(folio);
if (!TestClearPageMlocked(page)) {
/* Potentially, PTE-mapped THP: do not skip the rest PTEs */
return 0;
zone_stat_mod_folio(folio, NR_MLOCK, nr_pages);
__count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
}
nr_pages = thp_nr_pages(page);
mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
if (!isolate_lru_page(page))
__munlock_isolated_page(page);
else
__munlock_isolation_failed(page);
return nr_pages - 1;
folio_get(folio);
if (!pagevec_add(pvec, mlock_lru(&folio->page)) ||
folio_test_large(folio) || lru_cache_disabled())
mlock_pagevec(pvec);
put_cpu_var(mlock_pvec);
}
/*
* convert get_user_pages() return value to posix mlock() error
/**
* mlock_new_page - mlock a newly allocated page not yet on LRU
* @page: page to be mlocked, either a normal page or a THP head.
*/
static int __mlock_posix_error_return(long retval)
void mlock_new_page(struct page *page)
{
if (retval == -EFAULT)
retval = -ENOMEM;
else if (retval == -ENOMEM)
retval = -EAGAIN;
return retval;
struct pagevec *pvec = &get_cpu_var(mlock_pvec);
int nr_pages = thp_nr_pages(page);
SetPageMlocked(page);
mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
__count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
get_page(page);
if (!pagevec_add(pvec, mlock_new(page)) ||
PageHead(page) || lru_cache_disabled())
mlock_pagevec(pvec);
put_cpu_var(mlock_pvec);
}
/*
* Prepare page for fast batched LRU putback via putback_lru_evictable_pagevec()
*
* The fast path is available only for evictable pages with single mapping.
* Then we can bypass the per-cpu pvec and get better performance.
* when mapcount > 1 we need page_mlock() which can fail.
* when !page_evictable(), we need the full redo logic of putback_lru_page to
* avoid leaving evictable page in unevictable list.
*
* In case of success, @page is added to @pvec and @pgrescued is incremented
* in case that the page was previously unevictable. @page is also unlocked.
/**
* munlock_page - munlock a page
* @page: page to be munlocked, either a normal page or a THP head.
*/
static bool __putback_lru_fast_prepare(struct page *page, struct pagevec *pvec,
int *pgrescued)
void munlock_page(struct page *page)
{
VM_BUG_ON_PAGE(PageLRU(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
if (page_mapcount(page) <= 1 && page_evictable(page)) {
pagevec_add(pvec, page);
if (TestClearPageUnevictable(page))
(*pgrescued)++;
unlock_page(page);
return true;
}
return false;
}
/*
* Putback multiple evictable pages to the LRU
*
* Batched putback of evictable pages that bypasses the per-cpu pvec. Some of
* the pages might have meanwhile become unevictable but that is OK.
*/
static void __putback_lru_fast(struct pagevec *pvec, int pgrescued)
{
count_vm_events(UNEVICTABLE_PGMUNLOCKED, pagevec_count(pvec));
/*
*__pagevec_lru_add() calls release_pages() so we don't call
* put_page() explicitly
*/
__pagevec_lru_add(pvec);
count_vm_events(UNEVICTABLE_PGRESCUED, pgrescued);
}
/*
* Munlock a batch of pages from the same zone
*
* The work is split to two main phases. First phase clears the Mlocked flag
* and attempts to isolate the pages, all under a single zone lru lock.
* The second phase finishes the munlock only for pages where isolation
* succeeded.
*
* Note that the pagevec may be modified during the process.
*/
static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
{
int i;
int nr = pagevec_count(pvec);
int delta_munlocked = -nr;
struct pagevec pvec_putback;
struct lruvec *lruvec = NULL;
int pgrescued = 0;
pagevec_init(&pvec_putback);
/* Phase 1: page isolation */
for (i = 0; i < nr; i++) {
struct page *page = pvec->pages[i];
struct folio *folio = page_folio(page);
if (TestClearPageMlocked(page)) {
/*
* We already have pin from follow_page_mask()
* so we can spare the get_page() here.
*/
if (TestClearPageLRU(page)) {
lruvec = folio_lruvec_relock_irq(folio, lruvec);
del_page_from_lru_list(page, lruvec);
continue;
} else
__munlock_isolation_failed(page);
} else {
delta_munlocked++;
}
/*
* We won't be munlocking this page in the next phase
* but we still need to release the follow_page_mask()
* pin. We cannot do it under lru_lock however. If it's
* the last pin, __page_cache_release() would deadlock.
*/
pagevec_add(&pvec_putback, pvec->pages[i]);
pvec->pages[i] = NULL;
}
if (lruvec) {
__mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
unlock_page_lruvec_irq(lruvec);
} else if (delta_munlocked) {
mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
}
/* Now we can release pins of pages that we are not munlocking */
pagevec_release(&pvec_putback);
/* Phase 2: page munlock */
for (i = 0; i < nr; i++) {
struct page *page = pvec->pages[i];
if (page) {
lock_page(page);
if (!__putback_lru_fast_prepare(page, &pvec_putback,
&pgrescued)) {
/*
* Slow path. We don't want to lose the last
* pin before unlock_page()
*/
get_page(page); /* for putback_lru_page() */
__munlock_isolated_page(page);
unlock_page(page);
put_page(page); /* from follow_page_mask() */
}
}
}
struct pagevec *pvec = &get_cpu_var(mlock_pvec);
/*
* Phase 3: page putback for pages that qualified for the fast path
* This will also call put_page() to return pin from follow_page_mask()
* TestClearPageMlocked(page) must be left to __munlock_page(),
* which will check whether the page is multiply mlocked.
*/
if (pagevec_count(&pvec_putback))
__putback_lru_fast(&pvec_putback, pgrescued);
get_page(page);
if (!pagevec_add(pvec, page) ||
PageHead(page) || lru_cache_disabled())
mlock_pagevec(pvec);
put_cpu_var(mlock_pvec);
}
/*
* Fill up pagevec for __munlock_pagevec using pte walk
*
* The function expects that the struct page corresponding to @start address is
* a non-TPH page already pinned and in the @pvec, and that it belongs to @zone.
*
* The rest of @pvec is filled by subsequent pages within the same pmd and same
* zone, as long as the pte's are present and vm_normal_page() succeeds. These
* pages also get pinned.
*
* Returns the address of the next page that should be scanned. This equals
* @start + PAGE_SIZE when no page could be added by the pte walk.
*/
static unsigned long __munlock_pagevec_fill(struct pagevec *pvec,
struct vm_area_struct *vma, struct zone *zone,
unsigned long start, unsigned long end)
static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
pte_t *pte;
struct vm_area_struct *vma = walk->vma;
spinlock_t *ptl;
pte_t *start_pte, *pte;
struct page *page;
/*
* Initialize pte walk starting at the already pinned page where we
* are sure that there is a pte, as it was pinned under the same
* mmap_lock write op.
*/
pte = get_locked_pte(vma->vm_mm, start, &ptl);
/* Make sure we do not cross the page table boundary */
end = pgd_addr_end(start, end);
end = p4d_addr_end(start, end);
end = pud_addr_end(start, end);
end = pmd_addr_end(start, end);
/* The page next to the pinned page is the first we will try to get */
start += PAGE_SIZE;
while (start < end) {
struct page *page = NULL;
pte++;
if (pte_present(*pte))
page = vm_normal_page(vma, start, *pte);
/*
* Break if page could not be obtained or the page's node+zone does not
* match
*/
if (!page || page_zone(page) != zone)
break;
/*
* Do not use pagevec for PTE-mapped THP,
* munlock_vma_pages_range() will handle them.
*/
if (PageTransCompound(page))
break;
get_page(page);
/*
* Increase the address that will be returned *before* the
* eventual break due to pvec becoming full by adding the page
*/
start += PAGE_SIZE;
if (pagevec_add(pvec, page) == 0)
break;
ptl = pmd_trans_huge_lock(pmd, vma);
if (ptl) {
if (!pmd_present(*pmd))
goto out;
if (is_huge_zero_pmd(*pmd))
goto out;
page = pmd_page(*pmd);
if (vma->vm_flags & VM_LOCKED)
mlock_folio(page_folio(page));
else
munlock_page(page);
goto out;
}
pte_unmap_unlock(pte, ptl);
return start;
start_pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (pte = start_pte; addr != end; pte++, addr += PAGE_SIZE) {
if (!pte_present(*pte))
continue;
page = vm_normal_page(vma, addr, *pte);
if (!page)
continue;
if (PageTransCompound(page))
continue;
if (vma->vm_flags & VM_LOCKED)
mlock_folio(page_folio(page));
else
munlock_page(page);
}
pte_unmap(start_pte);
out:
spin_unlock(ptl);
cond_resched();
return 0;
}
/*
* munlock_vma_pages_range() - munlock all pages in the vma range.'
* @vma - vma containing range to be munlock()ed.
* mlock_vma_pages_range() - mlock any pages already in the range,
* or munlock all pages in the range.
* @vma - vma containing range to be mlock()ed or munlock()ed
* @start - start address in @vma of the range
* @end - end of range in @vma.
* @end - end of range in @vma
* @newflags - the new set of flags for @vma.
*
* For mremap(), munmap() and exit().
*
* Called with @vma VM_LOCKED.
*
* Returns with VM_LOCKED cleared. Callers must be prepared to
* deal with this.
*
* We don't save and restore VM_LOCKED here because pages are
* still on lru. In unmap path, pages might be scanned by reclaim
* and re-mlocked by page_mlock/try_to_unmap before we unmap and
* free them. This will result in freeing mlocked pages.
* Called for mlock(), mlock2() and mlockall(), to set @vma VM_LOCKED;
* called for munlock() and munlockall(), to clear VM_LOCKED from @vma.
*/
void munlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
static void mlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end, vm_flags_t newflags)
{
vma->vm_flags &= VM_LOCKED_CLEAR_MASK;
static const struct mm_walk_ops mlock_walk_ops = {
.pmd_entry = mlock_pte_range,
};
while (start < end) {
struct page *page;
unsigned int page_mask = 0;
unsigned long page_increm;
struct pagevec pvec;
struct zone *zone;
/*
* There is a slight chance that concurrent page migration,
* or page reclaim finding a page of this now-VM_LOCKED vma,
* will call mlock_vma_page() and raise page's mlock_count:
* double counting, leaving the page unevictable indefinitely.
* Communicate this danger to mlock_vma_page() with VM_IO,
* which is a VM_SPECIAL flag not allowed on VM_LOCKED vmas.
* mmap_lock is held in write mode here, so this weird
* combination should not be visible to other mmap_lock users;
* but WRITE_ONCE so rmap walkers must see VM_IO if VM_LOCKED.
*/
if (newflags & VM_LOCKED)
newflags |= VM_IO;
WRITE_ONCE(vma->vm_flags, newflags);
pagevec_init(&pvec);
/*
* Although FOLL_DUMP is intended for get_dump_page(),
* it just so happens that its special treatment of the
* ZERO_PAGE (returning an error instead of doing get_page)
* suits munlock very well (and if somehow an abnormal page
* has sneaked into the range, we won't oops here: great).
*/
page = follow_page(vma, start, FOLL_GET | FOLL_DUMP);
lru_add_drain();
walk_page_range(vma->vm_mm, start, end, &mlock_walk_ops, NULL);
lru_add_drain();
if (page && !IS_ERR(page)) {
if (PageTransTail(page)) {
VM_BUG_ON_PAGE(PageMlocked(page), page);
put_page(page); /* follow_page_mask() */
} else if (PageTransHuge(page)) {
lock_page(page);
/*
* Any THP page found by follow_page_mask() may
* have gotten split before reaching
* munlock_vma_page(), so we need to compute
* the page_mask here instead.
*/
page_mask = munlock_vma_page(page);
unlock_page(page);
put_page(page); /* follow_page_mask() */
} else {
/*
* Non-huge pages are handled in batches via
* pagevec. The pin from follow_page_mask()
* prevents them from collapsing by THP.
*/
pagevec_add(&pvec, page);
zone = page_zone(page);
/*
* Try to fill the rest of pagevec using fast
* pte walk. This will also update start to
* the next page to process. Then munlock the
* pagevec.
*/
start = __munlock_pagevec_fill(&pvec, vma,
zone, start, end);
__munlock_pagevec(&pvec, zone);
goto next;
}
}
page_increm = 1 + page_mask;
start += page_increm * PAGE_SIZE;
next:
cond_resched();
if (newflags & VM_IO) {
newflags &= ~VM_IO;
WRITE_ONCE(vma->vm_flags, newflags);
}
}
@ -500,10 +382,9 @@ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev,
pgoff_t pgoff;
int nr_pages;
int ret = 0;
int lock = !!(newflags & VM_LOCKED);
vm_flags_t old_flags = vma->vm_flags;
vm_flags_t oldflags = vma->vm_flags;
if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) ||
if (newflags == oldflags || (oldflags & VM_SPECIAL) ||
is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm) ||
vma_is_dax(vma) || vma_is_secretmem(vma))
/* don't set VM_LOCKED or VM_LOCKONFAULT and don't count */
@ -535,9 +416,9 @@ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev,
* Keep track of amount of locked VM.
*/
nr_pages = (end - start) >> PAGE_SHIFT;
if (!lock)
if (!(newflags & VM_LOCKED))
nr_pages = -nr_pages;
else if (old_flags & VM_LOCKED)
else if (oldflags & VM_LOCKED)
nr_pages = 0;
mm->locked_vm += nr_pages;
@ -547,11 +428,12 @@ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev,
* set VM_LOCKED, populate_vma_page_range will bring it back.
*/
if (lock)
if ((newflags & VM_LOCKED) && (oldflags & VM_LOCKED)) {
/* No work to do, and mlocking twice would be wrong */
vma->vm_flags = newflags;
else
munlock_vma_pages_range(vma, start, end);
} else {
mlock_vma_pages_range(vma, start, end, newflags);
}
out:
*prev = vma;
return ret;
@ -645,6 +527,18 @@ static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
return count >> PAGE_SHIFT;
}
/*
* convert get_user_pages() return value to posix mlock() error
*/
static int __mlock_posix_error_return(long retval)
{
if (retval == -EFAULT)
retval = -ENOMEM;
else if (retval == -ENOMEM)
retval = -EAGAIN;
return retval;
}
static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
{
unsigned long locked;

32
mm/mmap.c
View File

@ -2672,6 +2672,8 @@ detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
vma->vm_prev = NULL;
do {
vma_rb_erase(vma, &mm->mm_rb);
if (vma->vm_flags & VM_LOCKED)
mm->locked_vm -= vma_pages(vma);
mm->map_count--;
tail_vma = vma;
vma = vma->vm_next;
@ -2776,22 +2778,6 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
return __split_vma(mm, vma, addr, new_below);
}
static inline void
unlock_range(struct vm_area_struct *start, unsigned long limit)
{
struct mm_struct *mm = start->vm_mm;
struct vm_area_struct *tmp = start;
while (tmp && tmp->vm_start < limit) {
if (tmp->vm_flags & VM_LOCKED) {
mm->locked_vm -= vma_pages(tmp);
munlock_vma_pages_all(tmp);
}
tmp = tmp->vm_next;
}
}
/* Munmap is split into 2 main parts -- this part which finds
* what needs doing, and the areas themselves, which do the
* work. This now handles partial unmappings.
@ -2872,12 +2858,6 @@ int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
return error;
}
/*
* unlock any mlock()ed ranges before detaching vmas
*/
if (mm->locked_vm)
unlock_range(vma, end);
/* Detach vmas from rbtree */
if (!detach_vmas_to_be_unmapped(mm, vma, prev, end))
downgrade = false;
@ -3145,20 +3125,12 @@ void exit_mmap(struct mm_struct *mm)
* Nothing can be holding mm->mmap_lock here and the above call
* to mmu_notifier_release(mm) ensures mmu notifier callbacks in
* __oom_reap_task_mm() will not block.
*
* This needs to be done before calling unlock_range(),
* which clears VM_LOCKED, otherwise the oom reaper cannot
* reliably test it.
*/
(void)__oom_reap_task_mm(mm);
set_bit(MMF_OOM_SKIP, &mm->flags);
}
mmap_write_lock(mm);
if (mm->locked_vm)
unlock_range(mm->mmap, ULONG_MAX);
arch_exit_mmap(mm);
vma = mm->mmap;

7
mm/mmzone.c
View File

@ -81,6 +81,13 @@ void lruvec_init(struct lruvec *lruvec)
for_each_lru(lru)
INIT_LIST_HEAD(&lruvec->lists[lru]);
/*
* The "Unevictable LRU" is imaginary: though its size is maintained,
* it is never scanned, and unevictable pages are not threaded on it
* (so that their lru fields can be reused to hold mlock_count).
* Poison its list head, so that any operations on it would crash.
*/
list_del(&lruvec->lists[LRU_UNEVICTABLE]);
}
#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)

2
mm/oom_kill.c
View File

@ -523,7 +523,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
set_bit(MMF_UNSTABLE, &mm->flags);
for (vma = mm->mmap ; vma; vma = vma->vm_next) {
if (!can_madv_lru_vma(vma))
if (vma->vm_flags & (VM_HUGETLB|VM_PFNMAP))
continue;
/*

3
mm/page_alloc.c
View File

@ -734,8 +734,7 @@ static void prep_compound_head(struct page *page, unsigned int order)
set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
set_compound_order(page, order);
atomic_set(compound_mapcount_ptr(page), -1);
if (hpage_pincount_available(page))
atomic_set(compound_pincount_ptr(page), 0);
atomic_set(compound_pincount_ptr(page), 0);
}
static void prep_compound_tail(struct page *head, int tail_idx)

30
mm/page_idle.c
View File

@ -13,6 +13,8 @@
#include <linux/page_ext.h>
#include <linux/page_idle.h>
#include "internal.h"
#define BITMAP_CHUNK_SIZE sizeof(u64)
#define BITMAP_CHUNK_BITS (BITMAP_CHUNK_SIZE * BITS_PER_BYTE)
@ -44,15 +46,11 @@ static struct page *page_idle_get_page(unsigned long pfn)
return page;
}
static bool page_idle_clear_pte_refs_one(struct page *page,
static bool page_idle_clear_pte_refs_one(struct folio *folio,
struct vm_area_struct *vma,
unsigned long addr, void *arg)
{
struct page_vma_mapped_walk pvmw = {
.page = page,
.vma = vma,
.address = addr,
};
DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
bool referenced = false;
while (page_vma_mapped_walk(&pvmw)) {
@ -74,41 +72,41 @@ static bool page_idle_clear_pte_refs_one(struct page *page,
}
if (referenced) {
clear_page_idle(page);
folio_clear_idle(folio);
/*
* We cleared the referenced bit in a mapping to this page. To
* avoid interference with page reclaim, mark it young so that
* page_referenced() will return > 0.
* folio_referenced() will return > 0.
*/
set_page_young(page);
folio_set_young(folio);
}
return true;
}
static void page_idle_clear_pte_refs(struct page *page)
{
struct folio *folio = page_folio(page);
/*
* Since rwc.arg is unused, rwc is effectively immutable, so we
* can make it static const to save some cycles and stack.
*/
static const struct rmap_walk_control rwc = {
.rmap_one = page_idle_clear_pte_refs_one,
.anon_lock = page_lock_anon_vma_read,
.anon_lock = folio_lock_anon_vma_read,
};
bool need_lock;
if (!page_mapped(page) ||
!page_rmapping(page))
if (!folio_mapped(folio) || !folio_raw_mapping(folio))
return;
need_lock = !PageAnon(page) || PageKsm(page);
if (need_lock && !trylock_page(page))
need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
if (need_lock && !folio_trylock(folio))
return;
rmap_walk(page, (struct rmap_walk_control *)&rwc);
rmap_walk(folio, &rwc);
if (need_lock)
unlock_page(page);
folio_unlock(folio);
}
static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,

58
mm/page_vma_mapped.c
View File

@ -53,18 +53,6 @@ static bool map_pte(struct page_vma_mapped_walk *pvmw)
return true;
}
static inline bool pfn_is_match(struct page *page, unsigned long pfn)
{
unsigned long page_pfn = page_to_pfn(page);
/* normal page and hugetlbfs page */
if (!PageTransCompound(page) || PageHuge(page))
return page_pfn == pfn;
/* THP can be referenced by any subpage */
return pfn >= page_pfn && pfn - page_pfn < thp_nr_pages(page);
}
/**
* check_pte - check if @pvmw->page is mapped at the @pvmw->pte
* @pvmw: page_vma_mapped_walk struct, includes a pair pte and page for checking
@ -116,7 +104,17 @@ static bool check_pte(struct page_vma_mapped_walk *pvmw)
pfn = pte_pfn(*pvmw->pte);
}
return pfn_is_match(pvmw->page, pfn);
return (pfn - pvmw->pfn) < pvmw->nr_pages;
}
/* Returns true if the two ranges overlap. Careful to not overflow. */
static bool check_pmd(unsigned long pfn, struct page_vma_mapped_walk *pvmw)
{
if ((pfn + HPAGE_PMD_NR - 1) < pvmw->pfn)
return false;
if (pfn > pvmw->pfn + pvmw->nr_pages - 1)
return false;
return true;
}
static void step_forward(struct page_vma_mapped_walk *pvmw, unsigned long size)
@ -127,7 +125,7 @@ static void step_forward(struct page_vma_mapped_walk *pvmw, unsigned long size)
}
/**
* page_vma_mapped_walk - check if @pvmw->page is mapped in @pvmw->vma at
* page_vma_mapped_walk - check if @pvmw->pfn is mapped in @pvmw->vma at
* @pvmw->address
* @pvmw: pointer to struct page_vma_mapped_walk. page, vma, address and flags
* must be set. pmd, pte and ptl must be NULL.
@ -152,8 +150,8 @@ static void step_forward(struct page_vma_mapped_walk *pvmw, unsigned long size)
*/
bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
{
struct mm_struct *mm = pvmw->vma->vm_mm;
struct page *page = pvmw->page;
struct vm_area_struct *vma = pvmw->vma;
struct mm_struct *mm = vma->vm_mm;
unsigned long end;
pgd_t *pgd;
p4d_t *p4d;
@ -164,32 +162,26 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
if (pvmw->pmd && !pvmw->pte)
return not_found(pvmw);
if (unlikely(PageHuge(page))) {
if (unlikely(is_vm_hugetlb_page(vma))) {
unsigned long size = pvmw->nr_pages * PAGE_SIZE;
/* The only possible mapping was handled on last iteration */
if (pvmw->pte)
return not_found(pvmw);
/* when pud is not present, pte will be NULL */
pvmw->pte = huge_pte_offset(mm, pvmw->address, page_size(page));
pvmw->pte = huge_pte_offset(mm, pvmw->address, size);
if (!pvmw->pte)
return false;
pvmw->ptl = huge_pte_lockptr(page_hstate(page), mm, pvmw->pte);
pvmw->ptl = huge_pte_lockptr(size_to_hstate(size), mm,
pvmw->pte);
spin_lock(pvmw->ptl);
if (!check_pte(pvmw))
return not_found(pvmw);
return true;
}
/*
* Seek to next pte only makes sense for THP.
* But more important than that optimization, is to filter out
* any PageKsm page: whose page->index misleads vma_address()
* and vma_address_end() to disaster.
*/
end = PageTransCompound(page) ?
vma_address_end(page, pvmw->vma) :
pvmw->address + PAGE_SIZE;
end = vma_address_end(pvmw);
if (pvmw->pte)
goto next_pte;
restart:
@ -224,7 +216,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
if (likely(pmd_trans_huge(pmde))) {
if (pvmw->flags & PVMW_MIGRATION)
return not_found(pvmw);
if (pmd_page(pmde) != page)
if (!check_pmd(pmd_pfn(pmde), pvmw))
return not_found(pvmw);
return true;
}
@ -236,7 +228,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
return not_found(pvmw);
entry = pmd_to_swp_entry(pmde);
if (!is_migration_entry(entry) ||
pfn_swap_entry_to_page(entry) != page)
!check_pmd(swp_offset(entry), pvmw))
return not_found(pvmw);
return true;
}
@ -250,7 +242,8 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
* cleared *pmd but not decremented compound_mapcount().
*/
if ((pvmw->flags & PVMW_SYNC) &&
PageTransCompound(page)) {
transparent_hugepage_active(vma) &&
(pvmw->nr_pages >= HPAGE_PMD_NR)) {
spinlock_t *ptl = pmd_lock(mm, pvmw->pmd);
spin_unlock(ptl);
@ -307,7 +300,8 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma)
{
struct page_vma_mapped_walk pvmw = {
.page = page,
.pfn = page_to_pfn(page),
.nr_pages = 1,
.vma = vma,
.flags = PVMW_SYNC,
};

108
mm/readahead.c
View File

@ -262,7 +262,7 @@ static void read_pages(struct readahead_control *rac, struct list_head *pages,
blk_finish_plug(&plug);
BUG_ON(!list_empty(pages));
BUG_ON(pages && !list_empty(pages));
BUG_ON(readahead_count(rac));
out:
@ -361,7 +361,7 @@ EXPORT_SYMBOL_GPL(page_cache_ra_unbounded);
* behaviour which would occur if page allocations are causing VM writeback.
* We really don't want to intermingle reads and writes like that.
*/
void do_page_cache_ra(struct readahead_control *ractl,
static void do_page_cache_ra(struct readahead_control *ractl,
unsigned long nr_to_read, unsigned long lookahead_size)
{
struct inode *inode = ractl->mapping->host;
@ -545,11 +545,103 @@ static int try_context_readahead(struct address_space *mapping,
return 1;
}
/*
* There are some parts of the kernel which assume that PMD entries
* are exactly HPAGE_PMD_ORDER. Those should be fixed, but until then,
* limit the maximum allocation order to PMD size. I'm not aware of any
* assumptions about maximum order if THP are disabled, but 8 seems like
* a good order (that's 1MB if you're using 4kB pages)
*/
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define MAX_PAGECACHE_ORDER HPAGE_PMD_ORDER
#else
#define MAX_PAGECACHE_ORDER 8
#endif
static inline int ra_alloc_folio(struct readahead_control *ractl, pgoff_t index,
pgoff_t mark, unsigned int order, gfp_t gfp)
{
int err;
struct folio *folio = filemap_alloc_folio(gfp, order);
if (!folio)
return -ENOMEM;
if (mark - index < (1UL << order))
folio_set_readahead(folio);
err = filemap_add_folio(ractl->mapping, folio, index, gfp);
if (err)
folio_put(folio);
else
ractl->_nr_pages += 1UL << order;
return err;
}
void page_cache_ra_order(struct readahead_control *ractl,
struct file_ra_state *ra, unsigned int new_order)
{
struct address_space *mapping = ractl->mapping;
pgoff_t index = readahead_index(ractl);
pgoff_t limit = (i_size_read(mapping->host) - 1) >> PAGE_SHIFT;
pgoff_t mark = index + ra->size - ra->async_size;
int err = 0;
gfp_t gfp = readahead_gfp_mask(mapping);
if (!mapping_large_folio_support(mapping) || ra->size < 4)
goto fallback;
limit = min(limit, index + ra->size - 1);
if (new_order < MAX_PAGECACHE_ORDER) {
new_order += 2;
if (new_order > MAX_PAGECACHE_ORDER)
new_order = MAX_PAGECACHE_ORDER;
while ((1 << new_order) > ra->size)
new_order--;
}
while (index <= limit) {
unsigned int order = new_order;
/* Align with smaller pages if needed */
if (index & ((1UL << order) - 1)) {
order = __ffs(index);
if (order == 1)
order = 0;
}
/* Don't allocate pages past EOF */
while (index + (1UL << order) - 1 > limit) {
if (--order == 1)
order = 0;
}
err = ra_alloc_folio(ractl, index, mark, order, gfp);
if (err)
break;
index += 1UL << order;
}
if (index > limit) {
ra->size += index - limit - 1;
ra->async_size += index - limit - 1;
}
read_pages(ractl, NULL, false);
/*
* If there were already pages in the page cache, then we may have
* left some gaps. Let the regular readahead code take care of this
* situation.
*/
if (!err)
return;
fallback:
do_page_cache_ra(ractl, ra->size, ra->async_size);
}
/*
* A minimal readahead algorithm for trivial sequential/random reads.
*/
static void ondemand_readahead(struct readahead_control *ractl,
bool hit_readahead_marker, unsigned long req_size)
struct folio *folio, unsigned long req_size)
{
struct backing_dev_info *bdi = inode_to_bdi(ractl->mapping->host);
struct file_ra_state *ra = ractl->ra;
@ -584,12 +676,12 @@ static void ondemand_readahead(struct readahead_control *ractl,
}
/*
* Hit a marked page without valid readahead state.
* Hit a marked folio without valid readahead state.
* E.g. interleaved reads.
* Query the pagecache for async_size, which normally equals to
* readahead size. Ramp it up and use it as the new readahead size.
*/
if (hit_readahead_marker) {
if (folio) {
pgoff_t start;
rcu_read_lock();
@ -662,7 +754,7 @@ static void ondemand_readahead(struct readahead_control *ractl,
}
ractl->_index = ra->start;
do_page_cache_ra(ractl, ra->size, ra->async_size);
page_cache_ra_order(ractl, ra, folio ? folio_order(folio) : 0);
}
void page_cache_sync_ra(struct readahead_control *ractl,
@ -690,7 +782,7 @@ void page_cache_sync_ra(struct readahead_control *ractl,
}
/* do read-ahead */
ondemand_readahead(ractl, false, req_count);
ondemand_readahead(ractl, NULL, req_count);
}
EXPORT_SYMBOL_GPL(page_cache_sync_ra);
@ -713,7 +805,7 @@ void page_cache_async_ra(struct readahead_control *ractl,
return;
/* do read-ahead */
ondemand_readahead(ractl, true, req_count);
ondemand_readahead(ractl, folio, req_count);
}
EXPORT_SYMBOL_GPL(page_cache_async_ra);

578
mm/rmap.c
View File

File diff suppressed because it is too large Load Diff

177
mm/swap.c
View File

@ -74,8 +74,8 @@ static DEFINE_PER_CPU(struct lru_pvecs, lru_pvecs) = {
};
/*
* This path almost never happens for VM activity - pages are normally
* freed via pagevecs. But it gets used by networking.
* This path almost never happens for VM activity - pages are normally freed
* via pagevecs. But it gets used by networking - and for compound pages.
*/
static void __page_cache_release(struct page *page)
{
@ -89,6 +89,14 @@ static void __page_cache_release(struct page *page)
__clear_page_lru_flags(page);
unlock_page_lruvec_irqrestore(lruvec, flags);
}
/* See comment on PageMlocked in release_pages() */
if (unlikely(PageMlocked(page))) {
int nr_pages = thp_nr_pages(page);
__ClearPageMlocked(page);
mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
count_vm_events(UNEVICTABLE_PGCLEARED, nr_pages);
}
__ClearPageWaiters(page);
}
@ -114,17 +122,9 @@ static void __put_compound_page(struct page *page)
void __put_page(struct page *page)
{
if (is_zone_device_page(page)) {
put_dev_pagemap(page->pgmap);
/*
* The page belongs to the device that created pgmap. Do
* not return it to page allocator.
*/
return;
}
if (unlikely(PageCompound(page)))
if (unlikely(is_zone_device_page(page)))
free_zone_device_page(page);
else if (unlikely(PageCompound(page)))
__put_compound_page(page);
else
__put_single_page(page);
@ -482,22 +482,12 @@ EXPORT_SYMBOL(folio_add_lru);
void lru_cache_add_inactive_or_unevictable(struct page *page,
struct vm_area_struct *vma)
{
bool unevictable;
VM_BUG_ON_PAGE(PageLRU(page), page);
unevictable = (vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) == VM_LOCKED;
if (unlikely(unevictable) && !TestSetPageMlocked(page)) {
int nr_pages = thp_nr_pages(page);
/*
* We use the irq-unsafe __mod_zone_page_state because this
* counter is not modified from interrupt context, and the pte
* lock is held(spinlock), which implies preemption disabled.
*/
__mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
}
lru_cache_add(page);
if (unlikely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) == VM_LOCKED))
mlock_new_page(page);
else
lru_cache_add(page);
}
/*
@ -636,35 +626,37 @@ void lru_add_drain_cpu(int cpu)
pagevec_lru_move_fn(pvec, lru_lazyfree_fn);
activate_page_drain(cpu);
mlock_page_drain(cpu);
}
/**
* deactivate_file_page - forcefully deactivate a file page
* @page: page to deactivate
* deactivate_file_folio() - Forcefully deactivate a file folio.
* @folio: Folio to deactivate.
*
* This function hints the VM that @page is a good reclaim candidate,
* for example if its invalidation fails due to the page being dirty
* This function hints to the VM that @folio is a good reclaim candidate,
* for example if its invalidation fails due to the folio being dirty
* or under writeback.
*
* Context: Caller holds a reference on the page.
*/
void deactivate_file_page(struct page *page)
void deactivate_file_folio(struct folio *folio)
{
struct pagevec *pvec;
/*
* In a workload with many unevictable page such as mprotect,
* unevictable page deactivation for accelerating reclaim is pointless.
* In a workload with many unevictable pages such as mprotect,
* unevictable folio deactivation for accelerating reclaim is pointless.
*/
if (PageUnevictable(page))
if (folio_test_unevictable(folio))
return;
if (likely(get_page_unless_zero(page))) {
struct pagevec *pvec;
folio_get(folio);
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate_file);
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate_file);
if (pagevec_add_and_need_flush(pvec, page))
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
local_unlock(&lru_pvecs.lock);
}
if (pagevec_add_and_need_flush(pvec, &folio->page))
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
local_unlock(&lru_pvecs.lock);
}
/*
@ -837,6 +829,7 @@ inline void __lru_add_drain_all(bool force_all_cpus)
pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) ||
pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) ||
need_activate_page_drain(cpu) ||
need_mlock_page_drain(cpu) ||
has_bh_in_lru(cpu, NULL)) {
INIT_WORK(work, lru_add_drain_per_cpu);
queue_work_on(cpu, mm_percpu_wq, work);
@ -935,18 +928,10 @@ void release_pages(struct page **pages, int nr)
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL;
}
/*
* ZONE_DEVICE pages that return 'false' from
* page_is_devmap_managed() do not require special
* processing, and instead, expect a call to
* put_page_testzero().
*/
if (page_is_devmap_managed(page)) {
put_devmap_managed_page(page);
if (put_devmap_managed_page(page))
continue;
}
if (put_page_testzero(page))
put_dev_pagemap(page->pgmap);
free_zone_device_page(page);
continue;
}
@ -974,6 +959,18 @@ void release_pages(struct page **pages, int nr)
__clear_page_lru_flags(page);
}
/*
* In rare cases, when truncation or holepunching raced with
* munlock after VM_LOCKED was cleared, Mlocked may still be
* found set here. This does not indicate a problem, unless
* "unevictable_pgs_cleared" appears worryingly large.
*/
if (unlikely(PageMlocked(page))) {
__ClearPageMlocked(page);
dec_zone_page_state(page, NR_MLOCK);
count_vm_event(UNEVICTABLE_PGCLEARED);
}
__ClearPageWaiters(page);
list_add(&page->lru, &pages_to_free);
@ -1014,43 +1011,32 @@ static void __pagevec_lru_add_fn(struct folio *folio, struct lruvec *lruvec)
VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
/*
* A folio becomes evictable in two ways:
* 1) Within LRU lock [munlock_vma_page() and __munlock_pagevec()].
* 2) Before acquiring LRU lock to put the folio on the correct LRU
* and then
* a) do PageLRU check with lock [check_move_unevictable_pages]
* b) do PageLRU check before lock [clear_page_mlock]
*
* (1) & (2a) are ok as LRU lock will serialize them. For (2b), we need
* following strict ordering:
*
* #0: __pagevec_lru_add_fn #1: clear_page_mlock
*
* folio_set_lru() folio_test_clear_mlocked()
* smp_mb() // explicit ordering // above provides strict
* // ordering
* folio_test_mlocked() folio_test_lru()
*
*
* if '#1' does not observe setting of PG_lru by '#0' and
* fails isolation, the explicit barrier will make sure that
* folio_evictable check will put the folio on the correct
* LRU. Without smp_mb(), folio_set_lru() can be reordered
* after folio_test_mlocked() check and can make '#1' fail the
* isolation of the folio whose mlocked bit is cleared (#0 is
* also looking at the same folio) and the evictable folio will
* be stranded on an unevictable LRU.
*/
folio_set_lru(folio);
smp_mb__after_atomic();
/*
* Is an smp_mb__after_atomic() still required here, before
* folio_evictable() tests PageMlocked, to rule out the possibility
* of stranding an evictable folio on an unevictable LRU? I think
* not, because __munlock_page() only clears PageMlocked while the LRU
* lock is held.
*
* (That is not true of __page_cache_release(), and not necessarily
* true of release_pages(): but those only clear PageMlocked after
* put_page_testzero() has excluded any other users of the page.)
*/
if (folio_evictable(folio)) {
if (was_unevictable)
__count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
} else {
folio_clear_active(folio);
folio_set_unevictable(folio);
/*
* folio->mlock_count = !!folio_test_mlocked(folio)?
* But that leaves __mlock_page() in doubt whether another
* actor has already counted the mlock or not. Err on the
* safe side, underestimate, let page reclaim fix it, rather
* than leaving a page on the unevictable LRU indefinitely.
*/
folio->mlock_count = 0;
if (!was_unevictable)
__count_vm_events(UNEVICTABLE_PGCULLED, nr_pages);
}
@ -1158,26 +1144,3 @@ void __init swap_setup(void)
* _really_ don't want to cluster much more
*/
}
#ifdef CONFIG_DEV_PAGEMAP_OPS
void put_devmap_managed_page(struct page *page)
{
int count;
if (WARN_ON_ONCE(!page_is_devmap_managed(page)))
return;
count = page_ref_dec_return(page);
/*
* devmap page refcounts are 1-based, rather than 0-based: if
* refcount is 1, then the page is free and the refcount is
* stable because nobody holds a reference on the page.
*/
if (count == 1)
free_devmap_managed_page(page);
else if (!count)
__put_page(page);
}
EXPORT_SYMBOL(put_devmap_managed_page);
#endif

117
mm/truncate.c
View File

@ -193,27 +193,6 @@ static void truncate_cleanup_folio(struct folio *folio)
folio_clear_mappedtodisk(folio);
}
/*
* This is for invalidate_mapping_pages(). That function can be called at
* any time, and is not supposed to throw away dirty pages. But pages can
* be marked dirty at any time too, so use remove_mapping which safely
* discards clean, unused pages.
*
* Returns non-zero if the page was successfully invalidated.
*/
static int
invalidate_complete_page(struct address_space *mapping, struct page *page)
{
if (page->mapping != mapping)
return 0;
if (page_has_private(page) && !try_to_release_page(page, 0))
return 0;
return remove_mapping(mapping, page);
}
int truncate_inode_folio(struct address_space *mapping, struct folio *folio)
{
if (folio->mapping != mapping)
@ -294,22 +273,40 @@ int generic_error_remove_page(struct address_space *mapping, struct page *page)
}
EXPORT_SYMBOL(generic_error_remove_page);
/*
* Safely invalidate one page from its pagecache mapping.
* It only drops clean, unused pages. The page must be locked.
*
* Returns 1 if the page is successfully invalidated, otherwise 0.
*/
int invalidate_inode_page(struct page *page)
static long mapping_evict_folio(struct address_space *mapping,
struct folio *folio)
{
struct address_space *mapping = page_mapping(page);
if (folio_test_dirty(folio) || folio_test_writeback(folio))
return 0;
/* The refcount will be elevated if any page in the folio is mapped */
if (folio_ref_count(folio) >
folio_nr_pages(folio) + folio_has_private(folio) + 1)
return 0;
if (folio_has_private(folio) && !filemap_release_folio(folio, 0))
return 0;
return remove_mapping(mapping, folio);
}
/**
* invalidate_inode_page() - Remove an unused page from the pagecache.
* @page: The page to remove.
*
* Safely invalidate one page from its pagecache mapping.
* It only drops clean, unused pages.
*
* Context: Page must be locked.
* Return: The number of pages successfully removed.
*/
long invalidate_inode_page(struct page *page)
{
struct folio *folio = page_folio(page);
struct address_space *mapping = folio_mapping(folio);
/* The page may have been truncated before it was locked */
if (!mapping)
return 0;
if (PageDirty(page) || PageWriteback(page))
return 0;
if (page_mapped(page))
return 0;
return invalidate_complete_page(mapping, page);
return mapping_evict_folio(mapping, folio);
}
/**
@ -497,7 +494,18 @@ void truncate_inode_pages_final(struct address_space *mapping)
}
EXPORT_SYMBOL(truncate_inode_pages_final);
static unsigned long __invalidate_mapping_pages(struct address_space *mapping,
/**
* invalidate_mapping_pagevec - Invalidate all the unlocked pages of one inode
* @mapping: the address_space which holds the pages to invalidate
* @start: the offset 'from' which to invalidate
* @end: the offset 'to' which to invalidate (inclusive)
* @nr_pagevec: invalidate failed page number for caller
*
* This helper is similar to invalidate_mapping_pages(), except that it accounts
* for pages that are likely on a pagevec and counts them in @nr_pagevec, which
* will be used by the caller.
*/
unsigned long invalidate_mapping_pagevec(struct address_space *mapping,
pgoff_t start, pgoff_t end, unsigned long *nr_pagevec)
{
pgoff_t indices[PAGEVEC_SIZE];
@ -510,27 +518,27 @@ static unsigned long __invalidate_mapping_pages(struct address_space *mapping,
folio_batch_init(&fbatch);
while (find_lock_entries(mapping, index, end, &fbatch, indices)) {
for (i = 0; i < folio_batch_count(&fbatch); i++) {
struct page *page = &fbatch.folios[i]->page;
struct folio *folio = fbatch.folios[i];
/* We rely upon deletion not changing page->index */
/* We rely upon deletion not changing folio->index */
index = indices[i];
if (xa_is_value(page)) {
if (xa_is_value(folio)) {
count += invalidate_exceptional_entry(mapping,
index,
page);
folio);
continue;
}
index += thp_nr_pages(page) - 1;
index += folio_nr_pages(folio) - 1;
ret = invalidate_inode_page(page);
unlock_page(page);
ret = mapping_evict_folio(mapping, folio);
folio_unlock(folio);
/*
* Invalidation is a hint that the page is no longer
* Invalidation is a hint that the folio is no longer
* of interest and try to speed up its reclaim.
*/
if (!ret) {
deactivate_file_page(page);
deactivate_file_folio(folio);
/* It is likely on the pagevec of a remote CPU */
if (nr_pagevec)
(*nr_pagevec)++;
@ -562,29 +570,12 @@ static unsigned long __invalidate_mapping_pages(struct address_space *mapping,
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end)
{
return __invalidate_mapping_pages(mapping, start, end, NULL);
return invalidate_mapping_pagevec(mapping, start, end, NULL);
}
EXPORT_SYMBOL(invalidate_mapping_pages);
/**
* invalidate_mapping_pagevec - Invalidate all the unlocked pages of one inode
* @mapping: the address_space which holds the pages to invalidate
* @start: the offset 'from' which to invalidate
* @end: the offset 'to' which to invalidate (inclusive)
* @nr_pagevec: invalidate failed page number for caller
*
* This helper is similar to invalidate_mapping_pages(), except that it accounts
* for pages that are likely on a pagevec and counts them in @nr_pagevec, which
* will be used by the caller.
*/
void invalidate_mapping_pagevec(struct address_space *mapping,
pgoff_t start, pgoff_t end, unsigned long *nr_pagevec)
{
__invalidate_mapping_pages(mapping, start, end, nr_pagevec);
}
/*
* This is like invalidate_complete_page(), except it ignores the page's
* This is like invalidate_inode_page(), except it ignores the page's
* refcount. We do this because invalidate_inode_pages2() needs stronger
* invalidation guarantees, and cannot afford to leave pages behind because
* shrink_page_list() has a temp ref on them, or because they're transiently

14
mm/userfaultfd.c
View File

@ -95,10 +95,15 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
if (!pte_none(*dst_pte))
goto out_unlock;
if (page_in_cache)
page_add_file_rmap(page, false);
else
if (page_in_cache) {
/* Usually, cache pages are already added to LRU */
if (newly_allocated)
lru_cache_add(page);
page_add_file_rmap(page, dst_vma, false);
} else {
page_add_new_anon_rmap(page, dst_vma, dst_addr, false);
lru_cache_add_inactive_or_unevictable(page, dst_vma);
}
/*
* Must happen after rmap, as mm_counter() checks mapping (via
@ -106,9 +111,6 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
*/
inc_mm_counter(dst_mm, mm_counter(page));
if (newly_allocated)
lru_cache_add_inactive_or_unevictable(page, dst_vma);
set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
/* No need to invalidate - it was non-present before */

36
mm/util.c
View File

@ -681,9 +681,8 @@ bool folio_mapped(struct folio *folio)
}
EXPORT_SYMBOL(folio_mapped);
struct anon_vma *page_anon_vma(struct page *page)
struct anon_vma *folio_anon_vma(struct folio *folio)
{
struct folio *folio = page_folio(page);
unsigned long mapping = (unsigned long)folio->mapping;
if ((mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
@ -742,6 +741,39 @@ int __page_mapcount(struct page *page)
}
EXPORT_SYMBOL_GPL(__page_mapcount);
/**
* folio_mapcount() - Calculate the number of mappings of this folio.
* @folio: The folio.
*
* A large folio tracks both how many times the entire folio is mapped,
* and how many times each individual page in the folio is mapped.
* This function calculates the total number of times the folio is
* mapped.
*
* Return: The number of times this folio is mapped.
*/
int folio_mapcount(struct folio *folio)
{
int i, compound, nr, ret;
if (likely(!folio_test_large(folio)))
return atomic_read(&folio->_mapcount) + 1;
compound = folio_entire_mapcount(folio);
nr = folio_nr_pages(folio);
if (folio_test_hugetlb(folio))
return compound;
ret = compound;
for (i = 0; i < nr; i++)
ret += atomic_read(&folio_page(folio, i)->_mapcount) + 1;
/* File pages has compound_mapcount included in _mapcount */
if (!folio_test_anon(folio))
return ret - compound * nr;
if (folio_test_double_map(folio))
ret -= nr;
return ret;
}
/**
* folio_copy - Copy the contents of one folio to another.
* @dst: Folio to copy to.

305
mm/vmscan.c
View File

@ -979,36 +979,36 @@ void drop_slab(void)
drop_slab_node(nid);
}
static inline int is_page_cache_freeable(struct page *page)
static inline int is_page_cache_freeable(struct folio *folio)
{
/*
* A freeable page cache page is referenced only by the caller
* that isolated the page, the page cache and optional buffer
* heads at page->private.
*/
int page_cache_pins = thp_nr_pages(page);
return page_count(page) - page_has_private(page) == 1 + page_cache_pins;
return folio_ref_count(folio) - folio_test_private(folio) ==
1 + folio_nr_pages(folio);
}
/*
* We detected a synchronous write error writing a page out. Probably
* We detected a synchronous write error writing a folio out. Probably
* -ENOSPC. We need to propagate that into the address_space for a subsequent
* fsync(), msync() or close().
*
* The tricky part is that after writepage we cannot touch the mapping: nothing
* prevents it from being freed up. But we have a ref on the page and once
* that page is locked, the mapping is pinned.
* prevents it from being freed up. But we have a ref on the folio and once
* that folio is locked, the mapping is pinned.
*
* We're allowed to run sleeping lock_page() here because we know the caller has
* We're allowed to run sleeping folio_lock() here because we know the caller has
* __GFP_FS.
*/
static void handle_write_error(struct address_space *mapping,
struct page *page, int error)
struct folio *folio, int error)
{
lock_page(page);
if (page_mapping(page) == mapping)
folio_lock(folio);
if (folio_mapping(folio) == mapping)
mapping_set_error(mapping, error);
unlock_page(page);
folio_unlock(folio);
}
static bool skip_throttle_noprogress(pg_data_t *pgdat)
@ -1155,35 +1155,35 @@ typedef enum {
* pageout is called by shrink_page_list() for each dirty page.
* Calls ->writepage().
*/
static pageout_t pageout(struct page *page, struct address_space *mapping)
static pageout_t pageout(struct folio *folio, struct address_space *mapping)
{
/*
* If the page is dirty, only perform writeback if that write
* If the folio is dirty, only perform writeback if that write
* will be non-blocking. To prevent this allocation from being
* stalled by pagecache activity. But note that there may be
* stalls if we need to run get_block(). We could test
* PagePrivate for that.
*
* If this process is currently in __generic_file_write_iter() against
* this page's queue, we can perform writeback even if that
* this folio's queue, we can perform writeback even if that
* will block.
*
* If the page is swapcache, write it back even if that would
* If the folio is swapcache, write it back even if that would
* block, for some throttling. This happens by accident, because
* swap_backing_dev_info is bust: it doesn't reflect the
* congestion state of the swapdevs. Easy to fix, if needed.
*/
if (!is_page_cache_freeable(page))
if (!is_page_cache_freeable(folio))
return PAGE_KEEP;
if (!mapping) {
/*
* Some data journaling orphaned pages can have
* page->mapping == NULL while being dirty with clean buffers.
* Some data journaling orphaned folios can have
* folio->mapping == NULL while being dirty with clean buffers.
*/
if (page_has_private(page)) {
if (try_to_free_buffers(page)) {
ClearPageDirty(page);
pr_info("%s: orphaned page\n", __func__);
if (folio_test_private(folio)) {
if (try_to_free_buffers(&folio->page)) {
folio_clear_dirty(folio);
pr_info("%s: orphaned folio\n", __func__);
return PAGE_CLEAN;
}
}
@ -1192,7 +1192,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
if (mapping->a_ops->writepage == NULL)
return PAGE_ACTIVATE;
if (clear_page_dirty_for_io(page)) {
if (folio_clear_dirty_for_io(folio)) {
int res;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
@ -1202,21 +1202,21 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
.for_reclaim = 1,
};
SetPageReclaim(page);
res = mapping->a_ops->writepage(page, &wbc);
folio_set_reclaim(folio);
res = mapping->a_ops->writepage(&folio->page, &wbc);
if (res < 0)
handle_write_error(mapping, page, res);
handle_write_error(mapping, folio, res);
if (res == AOP_WRITEPAGE_ACTIVATE) {
ClearPageReclaim(page);
folio_clear_reclaim(folio);
return PAGE_ACTIVATE;
}
if (!PageWriteback(page)) {
if (!folio_test_writeback(folio)) {
/* synchronous write or broken a_ops? */
ClearPageReclaim(page);
folio_clear_reclaim(folio);
}
trace_mm_vmscan_writepage(page);
inc_node_page_state(page, NR_VMSCAN_WRITE);
trace_mm_vmscan_write_folio(folio);
node_stat_add_folio(folio, NR_VMSCAN_WRITE);
return PAGE_SUCCESS;
}
@ -1227,16 +1227,16 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
* Same as remove_mapping, but if the page is removed from the mapping, it
* gets returned with a refcount of 0.
*/
static int __remove_mapping(struct address_space *mapping, struct page *page,
static int __remove_mapping(struct address_space *mapping, struct folio *folio,
bool reclaimed, struct mem_cgroup *target_memcg)
{
int refcount;
void *shadow = NULL;
BUG_ON(!PageLocked(page));
BUG_ON(mapping != page_mapping(page));
BUG_ON(!folio_test_locked(folio));
BUG_ON(mapping != folio_mapping(folio));
if (!PageSwapCache(page))
if (!folio_test_swapcache(folio))
spin_lock(&mapping->host->i_lock);
xa_lock_irq(&mapping->i_pages);
/*
@ -1264,23 +1264,23 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
* Note that if SetPageDirty is always performed via set_page_dirty,
* and thus under the i_pages lock, then this ordering is not required.
*/
refcount = 1 + compound_nr(page);
if (!page_ref_freeze(page, refcount))
refcount = 1 + folio_nr_pages(folio);
if (!folio_ref_freeze(folio, refcount))
goto cannot_free;
/* note: atomic_cmpxchg in page_ref_freeze provides the smp_rmb */
if (unlikely(PageDirty(page))) {
page_ref_unfreeze(page, refcount);
if (unlikely(folio_test_dirty(folio))) {
folio_ref_unfreeze(folio, refcount);
goto cannot_free;
}
if (PageSwapCache(page)) {
swp_entry_t swap = { .val = page_private(page) };
mem_cgroup_swapout(page, swap);
if (folio_test_swapcache(folio)) {
swp_entry_t swap = folio_swap_entry(folio);
mem_cgroup_swapout(folio, swap);
if (reclaimed && !mapping_exiting(mapping))
shadow = workingset_eviction(page, target_memcg);
__delete_from_swap_cache(page, swap, shadow);
shadow = workingset_eviction(folio, target_memcg);
__delete_from_swap_cache(&folio->page, swap, shadow);
xa_unlock_irq(&mapping->i_pages);
put_swap_page(page, swap);
put_swap_page(&folio->page, swap);
} else {
void (*freepage)(struct page *);
@ -1301,61 +1301,67 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
* exceptional entries and shadow exceptional entries in the
* same address_space.
*/
if (reclaimed && page_is_file_lru(page) &&
if (reclaimed && folio_is_file_lru(folio) &&
!mapping_exiting(mapping) && !dax_mapping(mapping))
shadow = workingset_eviction(page, target_memcg);
__delete_from_page_cache(page, shadow);
shadow = workingset_eviction(folio, target_memcg);
__filemap_remove_folio(folio, shadow);
xa_unlock_irq(&mapping->i_pages);
if (mapping_shrinkable(mapping))
inode_add_lru(mapping->host);
spin_unlock(&mapping->host->i_lock);
if (freepage != NULL)
freepage(page);
freepage(&folio->page);
}
return 1;
cannot_free:
xa_unlock_irq(&mapping->i_pages);
if (!PageSwapCache(page))
if (!folio_test_swapcache(folio))
spin_unlock(&mapping->host->i_lock);
return 0;
}
/*
* Attempt to detach a locked page from its ->mapping. If it is dirty or if
* someone else has a ref on the page, abort and return 0. If it was
* successfully detached, return 1. Assumes the caller has a single ref on
* this page.
/**
* remove_mapping() - Attempt to remove a folio from its mapping.
* @mapping: The address space.
* @folio: The folio to remove.
*
* If the folio is dirty, under writeback or if someone else has a ref
* on it, removal will fail.
* Return: The number of pages removed from the mapping. 0 if the folio
* could not be removed.
* Context: The caller should have a single refcount on the folio and
* hold its lock.
*/
int remove_mapping(struct address_space *mapping, struct page *page)
long remove_mapping(struct address_space *mapping, struct folio *folio)
{
if (__remove_mapping(mapping, page, false, NULL)) {
if (__remove_mapping(mapping, folio, false, NULL)) {
/*
* Unfreezing the refcount with 1 rather than 2 effectively
* Unfreezing the refcount with 1 effectively
* drops the pagecache ref for us without requiring another
* atomic operation.
*/
page_ref_unfreeze(page, 1);
return 1;
folio_ref_unfreeze(folio, 1);
return folio_nr_pages(folio);
}
return 0;
}
/**
* putback_lru_page - put previously isolated page onto appropriate LRU list
* @page: page to be put back to appropriate lru list
* folio_putback_lru - Put previously isolated folio onto appropriate LRU list.
* @folio: Folio to be returned to an LRU list.
*
* Add previously isolated @page to appropriate LRU list.
* Page may still be unevictable for other reasons.
* Add previously isolated @folio to appropriate LRU list.
* The folio may still be unevictable for other reasons.
*
* lru_lock must not be held, interrupts must be enabled.
* Context: lru_lock must not be held, interrupts must be enabled.
*/
void putback_lru_page(struct page *page)
void folio_putback_lru(struct folio *folio)
{
lru_cache_add(page);
put_page(page); /* drop ref from isolate */
folio_add_lru(folio);
folio_put(folio); /* drop ref from isolate */
}
enum page_references {
@ -1365,61 +1371,61 @@ enum page_references {
PAGEREF_ACTIVATE,
};
static enum page_references page_check_references(struct page *page,
static enum page_references folio_check_references(struct folio *folio,
struct scan_control *sc)
{
int referenced_ptes, referenced_page;
int referenced_ptes, referenced_folio;
unsigned long vm_flags;
referenced_ptes = page_referenced(page, 1, sc->target_mem_cgroup,
&vm_flags);
referenced_page = TestClearPageReferenced(page);
referenced_ptes = folio_referenced(folio, 1, sc->target_mem_cgroup,
&vm_flags);
referenced_folio = folio_test_clear_referenced(folio);
/*
* Mlock lost the isolation race with us. Let try_to_unmap()
* move the page to the unevictable list.
* The supposedly reclaimable folio was found to be in a VM_LOCKED vma.
* Let the folio, now marked Mlocked, be moved to the unevictable list.
*/
if (vm_flags & VM_LOCKED)
return PAGEREF_RECLAIM;
return PAGEREF_ACTIVATE;
if (referenced_ptes) {
/*
* All mapped pages start out with page table
* All mapped folios start out with page table
* references from the instantiating fault, so we need
* to look twice if a mapped file/anon page is used more
* to look twice if a mapped file/anon folio is used more
* than once.
*
* Mark it and spare it for another trip around the
* inactive list. Another page table reference will
* lead to its activation.
*
* Note: the mark is set for activated pages as well
* so that recently deactivated but used pages are
* Note: the mark is set for activated folios as well
* so that recently deactivated but used folios are
* quickly recovered.
*/
SetPageReferenced(page);
folio_set_referenced(folio);
if (referenced_page || referenced_ptes > 1)
if (referenced_folio || referenced_ptes > 1)
return PAGEREF_ACTIVATE;
/*
* Activate file-backed executable pages after first usage.
* Activate file-backed executable folios after first usage.
*/
if ((vm_flags & VM_EXEC) && !PageSwapBacked(page))
if ((vm_flags & VM_EXEC) && !folio_test_swapbacked(folio))
return PAGEREF_ACTIVATE;
return PAGEREF_KEEP;
}
/* Reclaim if clean, defer dirty pages to writeback */
if (referenced_page && !PageSwapBacked(page))
/* Reclaim if clean, defer dirty folios to writeback */
if (referenced_folio && !folio_test_swapbacked(folio))
return PAGEREF_RECLAIM_CLEAN;
return PAGEREF_RECLAIM;
}
/* Check if a page is dirty or under writeback */
static void page_check_dirty_writeback(struct page *page,
static void folio_check_dirty_writeback(struct folio *folio,
bool *dirty, bool *writeback)
{
struct address_space *mapping;
@ -1428,24 +1434,24 @@ static void page_check_dirty_writeback(struct page *page,
* Anonymous pages are not handled by flushers and must be written
* from reclaim context. Do not stall reclaim based on them
*/
if (!page_is_file_lru(page) ||
(PageAnon(page) && !PageSwapBacked(page))) {
if (!folio_is_file_lru(folio) ||
(folio_test_anon(folio) && !folio_test_swapbacked(folio))) {
*dirty = false;
*writeback = false;
return;
}
/* By default assume that the page flags are accurate */
*dirty = PageDirty(page);
*writeback = PageWriteback(page);
/* By default assume that the folio flags are accurate */
*dirty = folio_test_dirty(folio);
*writeback = folio_test_writeback(folio);
/* Verify dirty/writeback state if the filesystem supports it */
if (!page_has_private(page))
if (!folio_test_private(folio))
return;
mapping = page_mapping(page);
mapping = folio_mapping(folio);
if (mapping && mapping->a_ops->is_dirty_writeback)
mapping->a_ops->is_dirty_writeback(page, dirty, writeback);
mapping->a_ops->is_dirty_writeback(&folio->page, dirty, writeback);
}
static struct page *alloc_demote_page(struct page *page, unsigned long node)
@ -1519,14 +1525,16 @@ static unsigned int shrink_page_list(struct list_head *page_list,
while (!list_empty(page_list)) {
struct address_space *mapping;
struct page *page;
struct folio *folio;
enum page_references references = PAGEREF_RECLAIM;
bool dirty, writeback, may_enter_fs;
unsigned int nr_pages;
cond_resched();
page = lru_to_page(page_list);
list_del(&page->lru);
folio = lru_to_folio(page_list);
list_del(&folio->lru);
page = &folio->page;
if (!trylock_page(page))
goto keep;
@ -1552,12 +1560,12 @@ static unsigned int shrink_page_list(struct list_head *page_list,
* reclaim_congested. kswapd will stall and start writing
* pages if the tail of the LRU is all dirty unqueued pages.
*/
page_check_dirty_writeback(page, &dirty, &writeback);
folio_check_dirty_writeback(folio, &dirty, &writeback);
if (dirty || writeback)
stat->nr_dirty++;
stat->nr_dirty += nr_pages;
if (dirty && !writeback)
stat->nr_unqueued_dirty++;
stat->nr_unqueued_dirty += nr_pages;
/*
* Treat this page as congested if the underlying BDI is or if
@ -1567,7 +1575,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
*/
mapping = page_mapping(page);
if (writeback && PageReclaim(page))
stat->nr_congested++;
stat->nr_congested += nr_pages;
/*
* If a page at the tail of the LRU is under writeback, there
@ -1616,7 +1624,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
if (current_is_kswapd() &&
PageReclaim(page) &&
test_bit(PGDAT_WRITEBACK, &pgdat->flags)) {
stat->nr_immediate++;
stat->nr_immediate += nr_pages;
goto activate_locked;
/* Case 2 above */
@ -1634,7 +1642,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
* and it's also appropriate in global reclaim.
*/
SetPageReclaim(page);
stat->nr_writeback++;
stat->nr_writeback += nr_pages;
goto activate_locked;
/* Case 3 above */
@ -1648,7 +1656,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
}
if (!ignore_references)
references = page_check_references(page, sc);
references = folio_check_references(folio, sc);
switch (references) {
case PAGEREF_ACTIVATE:
@ -1681,28 +1689,28 @@ static unsigned int shrink_page_list(struct list_head *page_list,
if (!PageSwapCache(page)) {
if (!(sc->gfp_mask & __GFP_IO))
goto keep_locked;
if (page_maybe_dma_pinned(page))
if (folio_maybe_dma_pinned(folio))
goto keep_locked;
if (PageTransHuge(page)) {
/* cannot split THP, skip it */
if (!can_split_huge_page(page, NULL))
if (!can_split_folio(folio, NULL))
goto activate_locked;
/*
* Split pages without a PMD map right
* away. Chances are some or all of the
* tail pages can be freed without IO.
*/
if (!compound_mapcount(page) &&
split_huge_page_to_list(page,
page_list))
if (!folio_entire_mapcount(folio) &&
split_folio_to_list(folio,
page_list))
goto activate_locked;
}
if (!add_to_swap(page)) {
if (!PageTransHuge(page))
goto activate_locked_split;
/* Fallback to swap normal pages */
if (split_huge_page_to_list(page,
page_list))
if (split_folio_to_list(folio,
page_list))
goto activate_locked;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
count_vm_event(THP_SWPOUT_FALLBACK);
@ -1716,9 +1724,9 @@ static unsigned int shrink_page_list(struct list_head *page_list,
/* Adding to swap updated mapping */
mapping = page_mapping(page);
}
} else if (unlikely(PageTransHuge(page))) {
/* Split file THP */
if (split_huge_page_to_list(page, page_list))
} else if (PageSwapBacked(page) && PageTransHuge(page)) {
/* Split shmem THP */
if (split_folio_to_list(folio, page_list))
goto keep_locked;
}
@ -1742,10 +1750,11 @@ static unsigned int shrink_page_list(struct list_head *page_list,
enum ttu_flags flags = TTU_BATCH_FLUSH;
bool was_swapbacked = PageSwapBacked(page);
if (unlikely(PageTransHuge(page)))
if (PageTransHuge(page) &&
thp_order(page) >= HPAGE_PMD_ORDER)
flags |= TTU_SPLIT_HUGE_PMD;
try_to_unmap(page, flags);
try_to_unmap(folio, flags);
if (page_mapped(page)) {
stat->nr_unmap_fail += nr_pages;
if (!was_swapbacked && PageSwapBacked(page))
@ -1793,13 +1802,13 @@ static unsigned int shrink_page_list(struct list_head *page_list,
* starts and then write it out here.
*/
try_to_unmap_flush_dirty();
switch (pageout(page, mapping)) {
switch (pageout(folio, mapping)) {
case PAGE_KEEP:
goto keep_locked;
case PAGE_ACTIVATE:
goto activate_locked;
case PAGE_SUCCESS:
stat->nr_pageout += thp_nr_pages(page);
stat->nr_pageout += nr_pages;
if (PageWriteback(page))
goto keep;
@ -1877,7 +1886,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
*/
count_vm_event(PGLAZYFREED);
count_memcg_page_event(page, PGLAZYFREED);
} else if (!mapping || !__remove_mapping(mapping, page, true,
} else if (!mapping || !__remove_mapping(mapping, folio, true,
sc->target_mem_cgroup))
goto keep_locked;
@ -2132,45 +2141,40 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
}
/**
* isolate_lru_page - tries to isolate a page from its LRU list
* @page: page to isolate from its LRU list
* folio_isolate_lru() - Try to isolate a folio from its LRU list.
* @folio: Folio to isolate from its LRU list.
*
* Isolates a @page from an LRU list, clears PageLRU and adjusts the
* vmstat statistic corresponding to whatever LRU list the page was on.
* Isolate a @folio from an LRU list and adjust the vmstat statistic
* corresponding to whatever LRU list the folio was on.
*
* Returns 0 if the page was removed from an LRU list.
* Returns -EBUSY if the page was not on an LRU list.
*
* The returned page will have PageLRU() cleared. If it was found on
* the active list, it will have PageActive set. If it was found on
* the unevictable list, it will have the PageUnevictable bit set. That flag
* The folio will have its LRU flag cleared. If it was found on the
* active list, it will have the Active flag set. If it was found on the
* unevictable list, it will have the Unevictable flag set. These flags
* may need to be cleared by the caller before letting the page go.
*
* The vmstat statistic corresponding to the list on which the page was
* found will be decremented.
*
* Restrictions:
* Context:
*
* (1) Must be called with an elevated refcount on the page. This is a
* fundamental difference from isolate_lru_pages (which is called
* fundamental difference from isolate_lru_pages() (which is called
* without a stable reference).
* (2) the lru_lock must not be held.
* (3) interrupts must be enabled.
* (2) The lru_lock must not be held.
* (3) Interrupts must be enabled.
*
* Return: 0 if the folio was removed from an LRU list.
* -EBUSY if the folio was not on an LRU list.
*/
int isolate_lru_page(struct page *page)
int folio_isolate_lru(struct folio *folio)
{
struct folio *folio = page_folio(page);
int ret = -EBUSY;
VM_BUG_ON_PAGE(!page_count(page), page);
WARN_RATELIMIT(PageTail(page), "trying to isolate tail page");
VM_BUG_ON_FOLIO(!folio_ref_count(folio), folio);
if (TestClearPageLRU(page)) {
if (folio_test_clear_lru(folio)) {
struct lruvec *lruvec;
get_page(page);
folio_get(folio);
lruvec = folio_lruvec_lock_irq(folio);
del_page_from_lru_list(page, lruvec);
lruvec_del_folio(lruvec, folio);
unlock_page_lruvec_irq(lruvec);
ret = 0;
}
@ -2406,7 +2410,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
*
* If the pages are mostly unmapped, the processing is fast and it is
* appropriate to hold lru_lock across the whole operation. But if
* the pages are mapped, the processing is slow (page_referenced()), so
* the pages are mapped, the processing is slow (folio_referenced()), so
* we should drop lru_lock around each page. It's impossible to balance
* this, so instead we remove the pages from the LRU while processing them.
* It is safe to rely on PG_active against the non-LRU pages in here because
@ -2426,7 +2430,6 @@ static void shrink_active_list(unsigned long nr_to_scan,
LIST_HEAD(l_hold); /* The pages which were snipped off */
LIST_HEAD(l_active);
LIST_HEAD(l_inactive);
struct page *page;
unsigned nr_deactivate, nr_activate;
unsigned nr_rotated = 0;
int file = is_file_lru(lru);
@ -2448,9 +2451,13 @@ static void shrink_active_list(unsigned long nr_to_scan,
spin_unlock_irq(&lruvec->lru_lock);
while (!list_empty(&l_hold)) {
struct folio *folio;
struct page *page;
cond_resched();
page = lru_to_page(&l_hold);
list_del(&page->lru);
folio = lru_to_folio(&l_hold);
list_del(&folio->lru);
page = &folio->page;
if (unlikely(!page_evictable(page))) {
putback_lru_page(page);
@ -2465,8 +2472,8 @@ static void shrink_active_list(unsigned long nr_to_scan,
}
}
if (page_referenced(page, 0, sc->target_mem_cgroup,
&vm_flags)) {
if (folio_referenced(folio, 0, sc->target_mem_cgroup,
&vm_flags)) {
/*
* Identify referenced, file-backed active pages and
* give them one more trip around the active list. So

25
mm/workingset.c
View File

@ -245,31 +245,32 @@ void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages)
}
/**
* workingset_eviction - note the eviction of a page from memory
* workingset_eviction - note the eviction of a folio from memory
* @target_memcg: the cgroup that is causing the reclaim
* @page: the page being evicted
* @folio: the folio being evicted
*
* Return: a shadow entry to be stored in @page->mapping->i_pages in place
* of the evicted @page so that a later refault can be detected.
* Return: a shadow entry to be stored in @folio->mapping->i_pages in place
* of the evicted @folio so that a later refault can be detected.
*/
void *workingset_eviction(struct page *page, struct mem_cgroup *target_memcg)
void *workingset_eviction(struct folio *folio, struct mem_cgroup *target_memcg)
{
struct pglist_data *pgdat = page_pgdat(page);
struct pglist_data *pgdat = folio_pgdat(folio);
unsigned long eviction;
struct lruvec *lruvec;
int memcgid;
/* Page is fully exclusive and pins page's memory cgroup pointer */
VM_BUG_ON_PAGE(PageLRU(page), page);
VM_BUG_ON_PAGE(page_count(page), page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
/* Folio is fully exclusive and pins folio's memory cgroup pointer */
VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
VM_BUG_ON_FOLIO(folio_ref_count(folio), folio);
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
lruvec = mem_cgroup_lruvec(target_memcg, pgdat);
/* XXX: target_memcg can be NULL, go through lruvec */
memcgid = mem_cgroup_id(lruvec_memcg(lruvec));
eviction = atomic_long_read(&lruvec->nonresident_age);
workingset_age_nonresident(lruvec, thp_nr_pages(page));
return pack_shadow(memcgid, pgdat, eviction, PageWorkingset(page));
workingset_age_nonresident(lruvec, folio_nr_pages(folio));
return pack_shadow(memcgid, pgdat, eviction,
folio_test_workingset(folio));
}
/**

35
tools/testing/selftests/vm/transhuge-stress.c
View File

@ -26,15 +26,17 @@
#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
int pagemap_fd;
int backing_fd = -1;
int mmap_flags = MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE;
#define PROT_RW (PROT_READ | PROT_WRITE)
int64_t allocate_transhuge(void *ptr)
{
uint64_t ent[2];
/* drop pmd */
if (mmap(ptr, HPAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_ANONYMOUS |
MAP_NORESERVE | MAP_PRIVATE, -1, 0) != ptr)
if (mmap(ptr, HPAGE_SIZE, PROT_RW, MAP_FIXED | mmap_flags,
backing_fd, 0) != ptr)
errx(2, "mmap transhuge");
if (madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE))
@ -60,6 +62,8 @@ int main(int argc, char **argv)
size_t ram, len;
void *ptr, *p;
struct timespec a, b;
int i = 0;
char *name = NULL;
double s;
uint8_t *map;
size_t map_len;
@ -69,13 +73,23 @@ int main(int argc, char **argv)
ram = SIZE_MAX / 4;
else
ram *= sysconf(_SC_PAGESIZE);
len = ram;
if (argc == 1)
len = ram;
else if (!strcmp(argv[1], "-h"))
errx(1, "usage: %s [size in MiB]", argv[0]);
else
len = atoll(argv[1]) << 20;
while (++i < argc) {
if (!strcmp(argv[i], "-h"))
errx(1, "usage: %s [size in MiB]", argv[0]);
else if (!strcmp(argv[i], "-f"))
name = argv[++i];
else
len = atoll(argv[i]) << 20;
}
if (name) {
backing_fd = open(name, O_RDWR);
if (backing_fd == -1)
errx(2, "open %s", name);
mmap_flags = MAP_SHARED;
}
warnx("allocate %zd transhuge pages, using %zd MiB virtual memory"
" and %zd MiB of ram", len >> HPAGE_SHIFT, len >> 20,
@ -86,8 +100,7 @@ int main(int argc, char **argv)
err(2, "open pagemap");
len -= len % HPAGE_SIZE;
ptr = mmap(NULL, len + HPAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE, -1, 0);
ptr = mmap(NULL, len + HPAGE_SIZE, PROT_RW, mmap_flags, backing_fd, 0);
if (ptr == MAP_FAILED)
err(2, "initial mmap");
ptr += HPAGE_SIZE - (uintptr_t)ptr % HPAGE_SIZE;