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authorChristoph Lameter <cl@gentwo.org>2011-10-31 17:09:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-31 17:30:50 -0700
commitdf9d6985be2a7e7683c46e4c6ea608fc69f02b45 (patch)
tree81bcf7cfbc842a7eee7aa18104a1fbecd2d316e8 /mm
parente0c23279c9f800c403f37511484d9014ac83adec (diff)
downloadlinux-stericsson-df9d6985be2a7e7683c46e4c6ea608fc69f02b45.tar.gz
mm: do not drain pagevecs for mlockall(MCL_FUTURE)
MCL_FUTURE does not move pages between lru list and draining the LRU per cpu pagevecs is a nasty activity. Avoid doing it unecessarily. Signed-off-by: Christoph Lameter <cl@gentwo.org> Cc: David Rientjes <rientjes@google.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Acked-by: Johannes Weiner <jweiner@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mlock.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/mlock.c b/mm/mlock.c
index 048260c4e02e..7debb4fdf79b 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -549,7 +549,8 @@ SYSCALL_DEFINE1(mlockall, int, flags)
if (!can_do_mlock())
goto out;
- lru_add_drain_all(); /* flush pagevec */
+ if (flags & MCL_CURRENT)
+ lru_add_drain_all(); /* flush pagevec */
down_write(&current->mm->mmap_sem);