The patch titled
Subject: mm: skip huge zero page in MADV_FREE
has been added to the -mm tree. Its filename is
mm-dont-split-thp-page-when-syscall-is-called-fix-5.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-dont-split-thp-page-when-syscall-is-called-fix-5.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-dont-split-thp-page-when-syscall-is-called-fix-5.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: mm: skip huge zero page in MADV_FREE
It is pointless to mark huge zero page as freeable.
Let's skip it.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/huge_memory.c~mm-dont-split-thp-page-when-syscall-is-called-fix-5 mm/huge_memory.c
--- a/mm/huge_memory.c~mm-dont-split-thp-page-when-syscall-is-called-fix-5
+++ a/mm/huge_memory.c
@@ -1542,6 +1542,9 @@ int madvise_free_huge_pmd(struct mmu_gat
struct page *page;
pmd_t orig_pmd;
+ if (is_huge_zero_pmd(*pmd))
+ goto out;
+
orig_pmd = pmdp_huge_get_and_clear(mm, addr, pmd);
/* No hugepage in swapcache */
@@ -1553,6 +1556,7 @@ int madvise_free_huge_pmd(struct mmu_gat
set_pmd_at(mm, addr, pmd, orig_pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
+out:
spin_unlock(ptl);
ret = 0;
}
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
thp-use-is_zero_pfn-only-after-pte_present-check.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-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-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
mm-clear-pg_dirty-to-mark-page-freeable.patch
mm-simplify-reclaim-path-for-madv_free.patch
mm-mark-stable-page-dirty-in-ksm.patch
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