Commit df9d6985 authored Oct 31, 2011 by Christoph Lameter Committed by Linus Torvalds Oct 31, 2011

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>

parent e0c23279

mm/mlock.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -549,6 +549,7 @@ SYSCALL_DEFINE1(mlockall, int, flags)
		if (!can_do_mlock())
		goto out;

		if (flags & MCL_CURRENT)
		lru_add_drain_all(); /* flush pagevec */

		down_write(&current->mm->mmap_sem);