The patch titled
Subject: mm: mark head page dirty in split_huge_page
has been added to the -mm tree. Its filename is
thp-reintroduce-split_huge_page-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/thp-reintroduce-split_huge_page-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/thp-reintroduce-split_huge_page-fix.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: mm: mark head page dirty in split_huge_page
In thp split in old THP refcount, we mappped all of pages (ie, head +
tails) to pte_mkdirty and mark PG_flags to every tail pages.
But with THP refcount redesign, we can lose dirty bit in page table and
PG_dirty for head page if we want to free the THP page using
migration_entry.
It ends up discarding head page by madvise_free suddenly. This patch
fixes it by mark the head page PG_dirty when VM splits the THP page.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/huge_memory.c~thp-reintroduce-split_huge_page-fix mm/huge_memory.c
--- a/mm/huge_memory.c~thp-reintroduce-split_huge_page-fix
+++ a/mm/huge_memory.c
@@ -3156,6 +3156,7 @@ static void __split_huge_page(struct pag
atomic_sub(tail_mapcount, &head->_count);
ClearPageCompound(head);
+ SetPageDirty(head);
spin_unlock_irq(&zone->lru_lock);
unfreeze_page(page_anon_vma(head), head);
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
thp-use-is_zero_pfn-only-after-pte_present-check.patch
thp-reintroduce-split_huge_page-fix.patch
x86-add-pmd_-for-thp.patch
sparc-add-pmd_-for-thp.patch
powerpc-add-pmd_-for-thp.patch
arm-add-pmd_mkclean-for-thp.patch
arm64-add-pmd_-for-thp.patch
mm-support-madvisemadv_free.patch
mm-support-madvisemadv_free-fix.patch
mm-support-madvisemadv_free-fix-5.patch
mm-support-madvisemadv_free-fix-6.patch
mm-mark-stable-page-dirty-in-ksm.patch
mm-dont-split-thp-page-when-syscall-is-called.patch
mm-dont-split-thp-page-when-syscall-is-called-fix-2.patch
mm-dont-split-thp-page-when-syscall-is-called-fix-5.patch
mm-dont-split-thp-page-when-syscall-is-called-fix-6.patch
mm-free-swp_entry-in-madvise_free.patch
mm-move-lazy-free-pages-to-inactive-list.patch
mm-move-lazy-free-pages-to-inactive-list-fix.patch
mm-move-lazy-free-pages-to-inactive-list-fix-fix-fix.patch
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