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mm: mempolicy: mbind and migrate_pages support thp migration 

This patch enables thp migration for mbind(2) and migrate_pages(2).

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Nellans <dnellans@nvidia.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi 2017-09-08 16:11:08 -07:00 committed by Linus Torvalds
parent ab6e3d0939
commit c863379849
1 changed files with 79 additions and 29 deletions
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108
mm/mempolicy.c
View File

@ -97,6 +97,7 @@
#include <linux/mm_inline.h>
#include <linux/mmu_notifier.h>
#include <linux/printk.h>
#include <linux/swapops.h>
#include <asm/tlbflush.h>
#include <linux/uaccess.h>
@ -426,6 +427,49 @@ static inline bool queue_pages_required(struct page *page,
return node_isset(nid, *qp->nmask) == !(flags & MPOL_MF_INVERT);
}
static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr,
unsigned long end, struct mm_walk *walk)
{
int ret = 0;
struct page *page;
struct queue_pages *qp = walk->private;
unsigned long flags;
if (unlikely(is_pmd_migration_entry(*pmd))) {
ret = 1;
goto unlock;
}
page = pmd_page(*pmd);
if (is_huge_zero_page(page)) {
spin_unlock(ptl);
__split_huge_pmd(walk->vma, pmd, addr, false, NULL);
goto out;
}
if (!thp_migration_supported()) {
get_page(page);
spin_unlock(ptl);
lock_page(page);
ret = split_huge_page(page);
unlock_page(page);
put_page(page);
goto out;
}
if (!queue_pages_required(page, qp)) {
ret = 1;
goto unlock;
}
ret = 1;
flags = qp->flags;
/* go to thp migration */
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
migrate_page_add(page, qp->pagelist, flags);
unlock:
spin_unlock(ptl);
out:
return ret;
}
/*
* Scan through pages checking if pages follow certain conditions,
* and move them to the pagelist if they do.
@ -437,30 +481,15 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
struct page *page;
struct queue_pages *qp = walk->private;
unsigned long flags = qp->flags;
int nid, ret;
int ret;
pte_t *pte;
spinlock_t *ptl;
if (pmd_trans_huge(*pmd)) {
ptl = pmd_lock(walk->mm, pmd);
if (pmd_trans_huge(*pmd)) {
page = pmd_page(*pmd);
if (is_huge_zero_page(page)) {
spin_unlock(ptl);
__split_huge_pmd(vma, pmd, addr, false, NULL);
} else {
get_page(page);
spin_unlock(ptl);
lock_page(page);
ret = split_huge_page(page);
unlock_page(page);
put_page(page);
if (ret)
return 0;
}
} else {
spin_unlock(ptl);
}
ptl = pmd_trans_huge_lock(pmd, vma);
if (ptl) {
ret = queue_pages_pmd(pmd, ptl, addr, end, walk);
if (ret)
return 0;
}
if (pmd_trans_unstable(pmd))
@ -481,7 +510,7 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
continue;
if (!queue_pages_required(page, qp))
continue;
if (PageTransCompound(page)) {
if (PageTransCompound(page) && !thp_migration_supported()) {
get_page(page);
pte_unmap_unlock(pte, ptl);
lock_page(page);
@ -893,19 +922,21 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
#ifdef CONFIG_MIGRATION
/*
* page migration
* page migration, thp tail pages can be passed.
*/
static void migrate_page_add(struct page *page, struct list_head *pagelist,
unsigned long flags)
{
struct page *head = compound_head(page);
/*
* Avoid migrating a page that is shared with others.
*/
if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) {
if (!isolate_lru_page(page)) {
list_add_tail(&page->lru, pagelist);
inc_node_page_state(page, NR_ISOLATED_ANON +
page_is_file_cache(page));
if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(head) == 1) {
if (!isolate_lru_page(head)) {
list_add_tail(&head->lru, pagelist);
mod_node_page_state(page_pgdat(head),
NR_ISOLATED_ANON + page_is_file_cache(head),
hpage_nr_pages(head));
}
}
}
@ -915,7 +946,17 @@ static struct page *new_node_page(struct page *page, unsigned long node, int **x
if (PageHuge(page))
return alloc_huge_page_node(page_hstate(compound_head(page)),
node);
else
else if (thp_migration_supported() && PageTransHuge(page)) {
struct page *thp;
thp = alloc_pages_node(node,
(GFP_TRANSHUGE | __GFP_THISNODE),
HPAGE_PMD_ORDER);
if (!thp)
return NULL;
prep_transhuge_page(thp);
return thp;
} else
return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE |
__GFP_THISNODE, 0);
}
@ -1081,6 +1122,15 @@ static struct page *new_page(struct page *page, unsigned long start, int **x)
if (PageHuge(page)) {
BUG_ON(!vma);
return alloc_huge_page_noerr(vma, address, 1);
} else if (thp_migration_supported() && PageTransHuge(page)) {
struct page *thp;
thp = alloc_hugepage_vma(GFP_TRANSHUGE, vma, address,
HPAGE_PMD_ORDER);
if (!thp)
return NULL;
prep_transhuge_page(thp);
return thp;
}
/*
* if !vma, alloc_page_vma() will use task or system default policy