linux-kernel - Re: [PATCH 03/10] mm: vmscan: Flatten kswapd priority loop

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Date:	Wed, 10 Apr 2013 14:29:07 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.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 03/10] mm: vmscan: Flatten kswapd priority loop

On Wed, Apr 10, 2013 at 04:47:31PM +0900, Kamezawa Hiroyuki wrote:
> > @@ -2811,8 +2814,16 @@ loop_again:
> >   
> >   			if ((buffer_heads_over_limit && is_highmem_idx(i)) ||
> >   			    !zone_balanced(zone, testorder,
> > -					   balance_gap, end_zone))
> > -				kswapd_shrink_zone(zone, &sc, lru_pages);
> > +					   balance_gap, end_zone)) {
> > +				/*
> > +				 * There should be no need to raise the
> > +				 * scanning priority if enough pages are
> > +				 * already being scanned that high
> > +				 * watermark would be met at 100% efficiency.
> > +				 */
> > +				if (kswapd_shrink_zone(zone, &sc, lru_pages))
> > +					raise_priority = false;
> 
> priority will be raised up enough to scan the amount of "high" watermark
> and will not get larger than that if some pages are reclaimed ?
> 

Yes.

-- 
Mel Gorman
SUSE Labs
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