This is a note to let you know that I've just added the patch titled
mm: numa: avoid unnecessary work on the failure path
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-avoid-unnecessary-work-on-the-failure-path.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 <stable@xxxxxxxxxxxxxxx> know about it.
>From eb4489f69f224356193364dc2762aa009738ca7f Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@xxxxxxx>
Date: Wed, 18 Dec 2013 17:08:39 -0800
Subject: mm: numa: avoid unnecessary work on the failure path
From: Mel Gorman <mgorman@xxxxxxx>
commit eb4489f69f224356193364dc2762aa009738ca7f upstream.
If a PMD changes during a THP migration then migration aborts but the
failure path is doing more work than is necessary.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Alex Thorlton <athorlton@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1720,7 +1720,8 @@ int migrate_misplaced_transhuge_page(str
putback_lru_page(page);
mod_zone_page_state(page_zone(page),
NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR);
- goto out_fail;
+
+ goto out_unlock;
}
/*
@@ -1770,6 +1771,7 @@ out_dropref:
set_pmd_at(mm, haddr, pmd, entry);
update_mmu_cache_pmd(vma, address, &entry);
+out_unlock:
unlock_page(page);
put_page(page);
return 0;
Patches currently in stable-queue which might be from mgorman@xxxxxxx are
queue-3.12/sched-numa-skip-inaccessible-vmas.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-avoid-unnecessary-work-on-the-failure-path.patch
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