From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: cl@gentwo.org
Cc: akpm@linux-foundation.org, linux-mm@kvack.org, mel@csn.ul.ie
Subject: Re: mm: Do not drain pagevecs for mlockall(MCL_FUTURE)
Date: Mon, 10 Oct 2011 12:15:17 -0400 [thread overview]
Message-ID: <4E931A15.3090400@jp.fujitsu.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1110071529110.15540@router.home>
(10/7/2011 4:32 PM), Christoph Lameter wrote:
> 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>
>
>
> ---
> 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);
Looks good to me. I guess I introduced this fault. sorry about that.
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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next prev parent reply other threads:[~2011-10-10 16:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-07 20:32 mm: Do not drain pagevecs for mlockall(MCL_FUTURE) Christoph Lameter
2011-10-08 2:45 ` David Rientjes
2011-10-08 4:28 ` Michel Lespinasse
2011-10-08 9:43 ` Minchan Kim
2011-10-10 16:15 ` KOSAKI Motohiro [this message]
2011-10-12 14:57 ` Johannes Weiner
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