linux-kernel - Re: [PATCH 08/10] mm: vmscan: Have kswapd shrink slab only once per priority

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Message-ID: <m2wqt6hycp.fsf@firstfloor.org>
Date:	Sun, 17 Mar 2013 07:53:10 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux-MM <linux-mm@...ck.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>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/10] mm: vmscan: Have kswapd shrink slab only once per priority

Mel Gorman <mgorman@...e.de> writes:

> If kswaps fails to make progress but continues to shrink slab then it'll
> either discard all of slab or consume CPU uselessly scanning shrinkers.
> This patch causes kswapd to only call the shrinkers once per priority.

Great. This was too aggressive for a long time. Probably still needs
more intelligence in the shrinkers itself to be really good though
(e.g. the old defrag heuristics in dcache)

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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