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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>
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@ -549,7 +549,8 @@ SYSCALL_DEFINE1(mlockall, int, flags)
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if (!can_do_mlock())
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goto out;
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lru_add_drain_all(); /* flush pagevec */
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if (flags & MCL_CURRENT)
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lru_add_drain_all(); /* flush pagevec */
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down_write(¤t->mm->mmap_sem);
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