提交 df9d6985 编写于 作者: C Christoph Lameter 提交者: Linus Torvalds

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: NChristoph Lameter <cl@gentwo.org>
Cc: David Rientjes <rientjes@google.com>
Reviewed-by: NMinchan Kim <minchan.kim@gmail.com>
Acked-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: NJohannes Weiner <jweiner@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 e0c23279
......@@ -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);
......
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