linux-kernel - Re: [PATCH 0/10] Reduce system disruption due to kswapd V2

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Message-ID: <20130410141445.GD3710@suse.de>
Date:	Wed, 10 Apr 2013 15:14:45 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Rik van Riel <riel@...hat.com>,
	Zlatko Calusic <zcalusic@...sync.net>,
	Johannes Weiner <hannes@...xchg.org>,
	dormando <dormando@...ia.net>,
	Satoru Moriya <satoru.moriya@....com>,
	Michal Hocko <mhocko@...e.cz>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/10] Reduce system disruption due to kswapd V2

On Tue, Apr 09, 2013 at 05:27:18PM +0000, Christoph Lameter wrote:
> One additional measure that may be useful is to make kswapd prefer one
> specific processor on a socket. Two benefits arise from that:
> 
> 1. Better use of cpu caches and therefore higher speed, less
> serialization.
> 

Considering the volume of pages that kswapd can scan when it's active
I would expect that it trashes its cache anyway. The L1 cache would be
flushed after scanning struct pages for just a few MB of memory.

> 2. Reduction of the disturbances to one processor.
> 

I've never checked it but I would have expected kswapd to stay on the
same processor for significant periods of time. Have you experienced
problems where kswapd bounces around on CPUs within a node causing
workload disruption?

-- 
Mel Gorman
SUSE Labs
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