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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>
hifive-unleashed-5.1
Christoph Lameter 2011-10-31 17:09:35 -07:00 committed by Linus Torvalds
parent e0c23279c9
commit df9d6985be
1 changed files with 2 additions and 1 deletions
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mm/mlock.c
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@ -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);