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

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Date:	Thu, 11 Apr 2013 10:53:25 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Dave Chinner <david@...morbit.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	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

On Wed, Apr 10, 2013 at 11:07:34AM +1000, Dave Chinner wrote:
> On Tue, Apr 09, 2013 at 12:13:59PM +0100, Mel Gorman wrote:
> > On Tue, Apr 09, 2013 at 03:53:25PM +0900, Joonsoo Kim wrote:
> > 
> > > I think that outside of zone loop is better place to run shrink_slab(),
> > > because shrink_slab() is not directly related to a specific zone.
> > > 
> > 
> > This is true and has been the case for a long time. The slab shrinkers
> > are not zone aware and it is complicated by the fact that slab usage can
> > indirectly pin memory on other zones.
> ......
> > > And this is a question not related to this patch.
> > > Why nr_slab is used here to decide zone->all_unreclaimable?
> > 
> > Slab is not directly associated with a slab but as reclaiming slab can
> > free memory from unpredictable zones we do not consider a zone to be
> > fully unreclaimable until we cannot shrink slab any more.
> 
> This is something the numa aware shrinkers will greatly help with -
> instead of being a global shrink it becomes a
> node-the-zone-belongs-to shrink, and so....
> 

Yes, 100% agreed.

-- 
Mel Gorman
SUSE Labs
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