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mm: numa: ensure anon_vma is locked to prevent parallel THP splits

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The anon_vma lock prevents parallel THP splits and any associated
complexity that arises when handling splits during THP migration.  This
patch checks if the lock was successfully acquired and bails from THP
migration if it failed for any reason.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: <stable@vger.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:
Mel Gorman 2013-12-18 17:08:38 -08:00 committed by Linus Torvalds
parent 0c5f83c23c
commit c3a489cac3
1 changed files with 7 additions and 0 deletions
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7
mm/huge_memory.c
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@ -1359,6 +1359,13 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto out_unlock;
}
/* Bail if we fail to protect against THP splits for any reason */
if (unlikely(!anon_vma)) {
put_page(page);
page_nid = -1;
goto clear_pmdnuma;
}
/*
* Migrate the THP to the requested node, returns with page unlocked
* and pmd_numa cleared.