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

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Message-ID: <20130412193947.GJ11656@suse.de>
Date:	Fri, 12 Apr 2013 20:40:04 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Zlatko Calusic <zcalusic@...sync.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Rik van Riel <riel@...hat.com>,
	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 Thu, Apr 11, 2013 at 10:55:13PM +0200, Zlatko Calusic wrote:
> On 09.04.2013 13:06, Mel Gorman wrote:
> <SNIP>
>
> - The only slightly negative thing I observed is that with the patch
> applied kswapd burns 10x - 20x more CPU. So instead of about 15
> seconds, it has now spent more than 4 minutes on one particular
> machine with a quite steady load (after about 12 days of uptime).
> Admittedly, that's still nothing too alarming, but...
> 

Would you happen to know what circumstances trigger the higher CPU
usage?

> - I like VERY much how you cleaned up the code so it is more
> readable now. I'd like to see it in the Linus tree as soon as
> possible. Very good job there!
> 

Thanks.

-- 
Mel Gorman
SUSE Labs
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