linux-kernel - Re: [PATCH 10/10] mm: vmscan: Move logic from balance_pgdat() to kswapd_shrink

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Date:	Sun, 17 Mar 2013 15:25:57 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
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 10/10] mm: vmscan: Move logic from balance_pgdat() to
 kswapd_shrink_zone()

On Sun, Mar 17, 2013 at 07:55:54AM -0700, Andi Kleen wrote:
> Mel Gorman <mgorman@...e.de> writes:
> 
> > +
> > +	/*
> > +	 * We put equal pressure on every zone, unless one zone has way too
> > +	 * many pages free already. The "too many pages" is defined as the
> > +	 * high wmark plus a "gap" where the gap is either the low
> > +	 * watermark or 1% of the zone, whichever is smaller.
> > +	 */
> > +	balance_gap = min(low_wmark_pages(zone),
> > +		(zone->managed_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
> > +		KSWAPD_ZONE_BALANCE_GAP_RATIO);
> 
> Don't like those hard coded tunables. 1% of a 512GB node can be still
> quite a lot. Shouldn't the low watermark be enough?
> 

1% of 512G would be lot but in that case, it'll use the low watermark as
the balance gap.

-- 
Mel Gorman
SUSE Labs
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