From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id D78726B002D for ; Fri, 7 Oct 2011 16:32:16 -0400 (EDT) Date: Fri, 7 Oct 2011 15:32:13 -0500 (CDT) From: Christoph Lameter Subject: mm: Do not drain pagevecs for mlockall(MCL_FUTURE) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, Mel Gorman 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 --- mm/mlock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-2.6/mm/mlock.c =================================================================== --- linux-2.6.orig/mm/mlock.c 2011-10-07 14:57:52.000000000 -0500 +++ linux-2.6/mm/mlock.c 2011-10-07 15:01:06.000000000 -0500 @@ -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(¤t->mm->mmap_sem); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org