linux-kernel - Re: [patch 1/7] mm: memcg: only evict file pages when we have plenty

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Message-ID: <20121218095621.GJ9887@suse.de>
Date:	Tue, 18 Dec 2012 09:56:21 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Satoru Moriya <satoru.moriya@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/7] mm: memcg: only evict file pages when we have plenty

On Mon, Dec 17, 2012 at 01:12:31PM -0500, Johannes Weiner wrote:
> e986850 "mm, vmscan: only evict file pages when we have plenty" makes
> a point of not going for anonymous memory while there is still enough
> inactive cache around.
> 
> The check was added only for global reclaim, but it is just as useful
> to reduce swapping in memory cgroup reclaim:
> 
> 200M-memcg-defconfig-j2
> 
>                                  vanilla                   patched
> Real time              454.06 (  +0.00%)         453.71 (  -0.08%)
> User time              668.57 (  +0.00%)         668.73 (  +0.02%)
> System time            128.92 (  +0.00%)         129.53 (  +0.46%)
> Swap in               1246.80 (  +0.00%)         814.40 ( -34.65%)
> Swap out              1198.90 (  +0.00%)         827.00 ( -30.99%)
> Pages allocated   16431288.10 (  +0.00%)    16434035.30 (  +0.02%)
> Major faults           681.50 (  +0.00%)         593.70 ( -12.86%)
> THP faults             237.20 (  +0.00%)         242.40 (  +2.18%)
> THP collapse           241.20 (  +0.00%)         248.50 (  +3.01%)
> THP splits             157.30 (  +0.00%)         161.40 (  +2.59%)
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> Acked-by: Michal Hocko <mhocko@...e.cz>

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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