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

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Message-ID: <20130317150935.GB2026@suse.de>
Date:	Sun, 17 Mar 2013 15:09:36 +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 03/10] mm: vmscan: Flatten kswapd priority loop

On Sun, Mar 17, 2013 at 07:36:22AM -0700, Andi Kleen wrote:
> Mel Gorman <mgorman@...e.de> writes:
> >
> > To avoid infinite looping for high-order allocation requests kswapd will
> > not reclaim for high-order allocations when it has reclaimed at least
> > twice the number of pages as the allocation request.
> 
> Will this make higher order allocations fail earlier? Or does compaction 
> still kick in early enough.
> 

Compaction should still kick in early enough. The impact it might have
is that direct reclaim/compaction may be used more than it was in the
past.

-- 
Mel Gorman
SUSE Labs
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