This is a note to let you know that I've just added the patch titled
mm: numa: ensure anon_vma is locked to prevent parallel THP splits
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-numa-ensure-anon_vma-is-locked-to-prevent-parallel-thp-splits.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From [email protected] Tue Jan 7 09:51:09 2014
From: Mel Gorman <[email protected]>
Date: Tue, 7 Jan 2014 14:00:41 +0000
Subject: mm: numa: ensure anon_vma is locked to prevent parallel THP splits
To: [email protected]
Cc: [email protected], [email protected], [email protected], Mel Gorman
<[email protected]>, [email protected]
Message-ID: <[email protected]>
From: Mel Gorman <[email protected]>
commit c3a489cac38d43ea6dc4ac240473b44b46deecf7 upstream.
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 <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Alex Thorlton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/huge_memory.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1342,6 +1342,13 @@ int do_huge_pmd_numa_page(struct mm_stru
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.
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/sched-numa-skip-inaccessible-vmas.patch
queue-3.12/mm-compaction-respect-ignore_skip_hint-in-update_pageblock_skip.patch
queue-3.12/mm-clear-pmd_numa-before-invalidating.patch
queue-3.12/mm-numa-ensure-anon_vma-is-locked-to-prevent-parallel-thp-splits.patch
queue-3.12/mm-numa-do-not-clear-pte-for-pte_numa-update.patch
queue-3.12/mm-hugetlb-check-for-pte-null-pointer-in-__page_check_address.patch
queue-3.12/mm-numa-serialise-parallel-get_user_page-against-thp-migration.patch
queue-3.12/mm-munlock-fix-deadlock-in-__munlock_pagevec.patch
queue-3.12/mm-numa-avoid-unnecessary-work-on-the-failure-path.patch
queue-3.12/mm-page_alloc-revert-numa-aspect-of-fair-allocation-policy.patch
queue-3.12/mm-mempolicy-correct-putback-method-for-isolate-pages-if-failed.patch
queue-3.12/mm-numa-do-not-clear-pmd-during-pte-update-scan.patch
queue-3.12/mm-numa-call-mmu-notifiers-on-thp-migration.patch
queue-3.12/mm-munlock-fix-a-bug-where-thp-tail-page-is-encountered.patch
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