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Date: Sun, 17 Mar 2013 15:09:36 +0000
From: Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH 03/10] mm: vmscan: Flatten kswapd priority loop
Message-ID: <20130317150935.GB2026@suse.de>
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To: Andi Kleen <andi@firstfloor.org>
Cc: Linux-MM <linux-mm@kvack.org>, Jiri Slaby <jslaby@suse.cz>, Valdis Kletnieks <Valdis.Kletnieks@vt.edu>, Rik van Riel <riel@redhat.com>, Zlatko Calusic <zcalusic@bitsync.net>, Johannes Weiner <hannes@cmpxchg.org>, dormando <dormando@rydia.net>, Satoru Moriya <satoru.moriya@hds.com>, Michal Hocko <mhocko@suse.cz>, LKML <linux-kernel@vger.kernel.org>

On Sun, Mar 17, 2013 at 07:36:22AM -0700, Andi Kleen wrote:
> Mel Gorman <mgorman@suse.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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