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mm: introduce wrappers to access mm->nr_ptes 

Let's add wrappers for ->nr_ptes with the same interface as for nr_pmd
and nr_pud.

The patch also makes nr_ptes accounting dependent onto CONFIG_MMU.  Page
table accounting doesn't make sense if you don't have page tables.

It's preparation for consolidation of page-table counters in mm_struct.

Link: http://lkml.kernel.org/r/20171006100651.44742-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2017-11-15 17:35:37 -08:00 committed by Linus Torvalds
parent b4e98d9ac7
commit c4812909f5
12 changed files with 54 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/mm/pgd.c
View File

@ -141,7 +141,7 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
pte = pmd_pgtable(*pmd);
pmd_clear(pmd);
pte_free(mm, pte);
atomic_long_dec(&mm->nr_ptes);
mm_dec_nr_ptes(mm);
no_pmd:
pud_clear(pud);
pmd_free(mm, pmd);

2
arch/sparc/mm/hugetlbpage.c
View File

@ -397,7 +397,7 @@ static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
pmd_clear(pmd);
pte_free_tlb(tlb, token, addr);
atomic_long_dec(&tlb->mm->nr_ptes);
mm_dec_nr_ptes(tlb->mm);
}
static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,

2
arch/unicore32/mm/pgd.c
View File

@ -97,7 +97,7 @@ void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd)
pte = pmd_pgtable(*pmd);
pmd_clear(pmd);
pte_free(mm, pte);
atomic_long_dec(&mm->nr_ptes);
mm_dec_nr_ptes(mm);
pmd_free(mm, pmd);
mm_dec_nr_pmds(mm);
free:

2
fs/proc/task_mmu.c
View File

@ -50,7 +50,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
swap = get_mm_counter(mm, MM_SWAPENTS);
ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes);
ptes = PTRS_PER_PTE * sizeof(pte_t) * mm_nr_ptes(mm);
pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm);
puds = PTRS_PER_PUD * sizeof(pud_t) * mm_nr_puds(mm);
seq_printf(m,

32
include/linux/mm.h
View File

@ -1680,6 +1680,38 @@ static inline void mm_dec_nr_pmds(struct mm_struct *mm)
}
#endif
#ifdef CONFIG_MMU
static inline void mm_nr_ptes_init(struct mm_struct *mm)
{
atomic_long_set(&mm->nr_ptes, 0);
}
static inline unsigned long mm_nr_ptes(const struct mm_struct *mm)
{
return atomic_long_read(&mm->nr_ptes);
}
static inline void mm_inc_nr_ptes(struct mm_struct *mm)
{
atomic_long_inc(&mm->nr_ptes);
}
static inline void mm_dec_nr_ptes(struct mm_struct *mm)
{
atomic_long_dec(&mm->nr_ptes);
}
#else
static inline void mm_nr_ptes_init(struct mm_struct *mm) {}
static inline unsigned long mm_nr_ptes(const struct mm_struct *mm)
{
return 0;
}
static inline void mm_inc_nr_ptes(struct mm_struct *mm) {}
static inline void mm_dec_nr_ptes(struct mm_struct *mm) {}
#endif
int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);

2
include/linux/mm_types.h
View File

@ -401,7 +401,9 @@ struct mm_struct {
*/
atomic_t mm_count;
#ifdef CONFIG_MMU
atomic_long_t nr_ptes; /* PTE page table pages */
#endif
#if CONFIG_PGTABLE_LEVELS > 2
atomic_long_t nr_pmds; /* PMD page table pages */
#endif

6
kernel/fork.c
View File

@ -817,7 +817,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
init_rwsem(&mm->mmap_sem);
INIT_LIST_HEAD(&mm->mmlist);
mm->core_state = NULL;
atomic_long_set(&mm->nr_ptes, 0);
mm_nr_ptes_init(mm);
mm_nr_pmds_init(mm);
mm_nr_puds_init(mm);
mm->map_count = 0;
@ -873,9 +873,9 @@ static void check_mm(struct mm_struct *mm)
"mm:%p idx:%d val:%ld\n", mm, i, x);
}
if (atomic_long_read(&mm->nr_ptes))
if (mm_nr_ptes(mm))
pr_alert("BUG: non-zero nr_ptes on freeing mm: %ld\n",
atomic_long_read(&mm->nr_ptes));
mm_nr_ptes(mm));
if (mm_nr_pmds(mm))
pr_alert("BUG: non-zero nr_pmds on freeing mm: %ld\n",
mm_nr_pmds(mm));

2
mm/debug.c
View File

@ -136,7 +136,7 @@ void dump_mm(const struct mm_struct *mm)
mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
mm->pgd, atomic_read(&mm->mm_users),
atomic_read(&mm->mm_count),
atomic_long_read((atomic_long_t *)&mm->nr_ptes),
mm_nr_ptes(mm),
mm_nr_pmds(mm),
mm_nr_puds(mm),
mm->map_count,

10
mm/huge_memory.c
View File

@ -606,7 +606,7 @@ static int __do_huge_pmd_anonymous_page(struct vm_fault *vmf, struct page *page,
pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable);
set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
atomic_long_inc(&vma->vm_mm->nr_ptes);
mm_inc_nr_ptes(vma->vm_mm);
spin_unlock(vmf->ptl);
count_vm_event(THP_FAULT_ALLOC);
}
@ -662,7 +662,7 @@ static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
if (pgtable)
pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, haddr, pmd, entry);
atomic_long_inc(&mm->nr_ptes);
mm_inc_nr_ptes(mm);
return true;
}
@ -747,7 +747,7 @@ static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
if (pgtable) {
pgtable_trans_huge_deposit(mm, pmd, pgtable);
atomic_long_inc(&mm->nr_ptes);
mm_inc_nr_ptes(mm);
}
set_pmd_at(mm, addr, pmd, entry);
@ -978,7 +978,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
get_page(src_page);
page_dup_rmap(src_page, true);
add_mm_counter(dst_mm, MM_ANONPAGES, HPAGE_PMD_NR);
atomic_long_inc(&dst_mm->nr_ptes);
mm_inc_nr_ptes(dst_mm);
pgtable_trans_huge_deposit(dst_mm, dst_pmd, pgtable);
pmdp_set_wrprotect(src_mm, addr, src_pmd);
@ -1695,7 +1695,7 @@ static inline void zap_deposited_table(struct mm_struct *mm, pmd_t *pmd)
pgtable = pgtable_trans_huge_withdraw(mm, pmd);
pte_free(mm, pgtable);
atomic_long_dec(&mm->nr_ptes);
mm_dec_nr_ptes(mm);
}
int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,

2
mm/khugepaged.c
View File

@ -1270,7 +1270,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
_pmd = pmdp_collapse_flush(vma, addr, pmd);
spin_unlock(ptl);
up_write(&vma->vm_mm->mmap_sem);
atomic_long_dec(&vma->vm_mm->nr_ptes);
mm_dec_nr_ptes(vma->vm_mm);
pte_free(vma->vm_mm, pmd_pgtable(_pmd));
}
}

8
mm/memory.c
View File

@ -438,7 +438,7 @@ static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
pgtable_t token = pmd_pgtable(*pmd);
pmd_clear(pmd);
pte_free_tlb(tlb, token, addr);
atomic_long_dec(&tlb->mm->nr_ptes);
mm_dec_nr_ptes(tlb->mm);
}
static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
@ -666,7 +666,7 @@ int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
ptl = pmd_lock(mm, pmd);
if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
atomic_long_inc(&mm->nr_ptes);
mm_inc_nr_ptes(mm);
pmd_populate(mm, pmd, new);
new = NULL;
}
@ -3238,7 +3238,7 @@ static int pte_alloc_one_map(struct vm_fault *vmf)
goto map_pte;
}
atomic_long_inc(&vma->vm_mm->nr_ptes);
mm_inc_nr_ptes(vma->vm_mm);
pmd_populate(vma->vm_mm, vmf->pmd, vmf->prealloc_pte);
spin_unlock(vmf->ptl);
vmf->prealloc_pte = NULL;
@ -3297,7 +3297,7 @@ static void deposit_prealloc_pte(struct vm_fault *vmf)
* We are going to consume the prealloc table,
* count that as nr_ptes.
*/
atomic_long_inc(&vma->vm_mm->nr_ptes);
mm_inc_nr_ptes(vma->vm_mm);
vmf->prealloc_pte = NULL;
}

5
mm/oom_kill.c
View File

@ -221,8 +221,7 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
* task's rss, pagetable and swap space use.
*/
points = get_mm_rss(p->mm) + get_mm_counter(p->mm, MM_SWAPENTS) +
atomic_long_read(&p->mm->nr_ptes) + mm_nr_pmds(p->mm) +
mm_nr_puds(p->mm);
mm_nr_ptes(p->mm) + mm_nr_pmds(p->mm) + mm_nr_puds(p->mm);
task_unlock(p);
/*
@ -417,7 +416,7 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
pr_info("[%5d] %5d %5d %8lu %8lu %7ld %7ld %7ld %8lu %5hd %s\n",
task->pid, from_kuid(&init_user_ns, task_uid(task)),
task->tgid, task->mm->total_vm, get_mm_rss(task->mm),
atomic_long_read(&task->mm->nr_ptes),
mm_nr_ptes(task->mm),
mm_nr_pmds(task->mm),
mm_nr_puds(task->mm),
get_mm_counter(task->mm, MM_SWAPENTS),