linux-kernel - Re: [PATCH 0/4] enhance compaction success rate

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Message-ID: <20141210063628.GB13371@js1304-P5Q-DELUXE>
Date:	Wed, 10 Dec 2014 15:36:28 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] enhance compaction success rate

On Mon, Dec 08, 2014 at 10:16:34AM +0100, Vlastimil Babka wrote:
> On 12/08/2014 08:16 AM, Joonsoo Kim wrote:
> >This patchset aims at increase of compaction success rate. Changes are
> >related to compaction finish condition and freepage isolation condition.
> >
> > From these changes, I did stress highalloc test in mmtests with nonmovable
> >order 7 allocation configuration, and success rate (%) at phase 1 are,
> >
> >Base	Patch-1	Patch-3	Patch-4
> >55.00	57.00	62.67	64.00
> >
> >And, compaction success rate (%) on same test are,
> >
> >Base	Patch-1	Patch-3	Patch-4
> >18.47	28.94	35.13	41.50
> 
> Did you test Patch-2 separately? Any difference to Patch 1?

I didn't test it separately. I guess that there is no remarkable
difference because it just slightly changes page stealing logic, not
compaction logic. Compaction success rate would not be affected by
patch 2, but, I will check it next time.

Thanks.
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