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| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2017-09-09 01:11:04 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-09 03:26:45 +0200 |
| commit | ab6e3d0939bb332d72444a532f0f72e0dfde7b7b (patch) | |
| tree | d2a292622ba757f4ac262840415d1a614acd8283 /fs/proc | |
| parent | mm: thp: check pmd migration entry in common path (diff) | |
| download | linux-ab6e3d0939bb332d72444a532f0f72e0dfde7b7b.tar.xz linux-ab6e3d0939bb332d72444a532f0f72e0dfde7b7b.zip | |
mm: soft-dirty: keep soft-dirty bits over thp migration
Soft dirty bit is designed to keep tracked over page migration. This
patch makes it work in the same manner for thp migration too.
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>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/task_mmu.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 8eec35af32e4..4b21c4e51ce4 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -978,17 +978,22 @@ static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, { pmd_t pmd = *pmdp; - /* See comment in change_huge_pmd() */ - pmdp_invalidate(vma, addr, pmdp); - if (pmd_dirty(*pmdp)) - pmd = pmd_mkdirty(pmd); - if (pmd_young(*pmdp)) - pmd = pmd_mkyoung(pmd); - - pmd = pmd_wrprotect(pmd); - pmd = pmd_clear_soft_dirty(pmd); - - set_pmd_at(vma->vm_mm, addr, pmdp, pmd); + if (pmd_present(pmd)) { + /* See comment in change_huge_pmd() */ + pmdp_invalidate(vma, addr, pmdp); + if (pmd_dirty(*pmdp)) + pmd = pmd_mkdirty(pmd); + if (pmd_young(*pmdp)) + pmd = pmd_mkyoung(pmd); + + pmd = pmd_wrprotect(pmd); + pmd = pmd_clear_soft_dirty(pmd); + + set_pmd_at(vma->vm_mm, addr, pmdp, pmd); + } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { + pmd = pmd_swp_clear_soft_dirty(pmd); + set_pmd_at(vma->vm_mm, addr, pmdp, pmd); + } } #else static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |