linux-kernel - Re: [PATCH 0/5] compaction related commits

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Date:	Fri, 07 Feb 2014 10:14:26 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Mel Gorman <mgorman@...e.de>, Joonsoo Kim <js1304@...il.com>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] compaction related commits

On 02/07/2014 06:08 AM, Joonsoo Kim wrote:
> This patchset is related to the compaction.
> 
> patch 1 fixes contrary implementation of the purpose of compaction.
> patch 2~4 are for optimization.
> patch 5 is just for clean-up.
> 
> I tested this patchset with stress-highalloc benchmark on Mel's mmtest
> and cannot find any regression in terms of success rate. And I find
> much reduced system time. Below is result of 3 runs.

What was the memory size? Mel told me this test shouldn't be run with more than 4GB.

> * Before
> time :: stress-highalloc 3276.26 user 740.52 system 1664.79 elapsed
> time :: stress-highalloc 3640.71 user 771.32 system 1633.83 elapsed
> time :: stress-highalloc 3691.64 user 775.44 system 1638.05 elapsed
> 
> avg system: 1645 s
> 
> * After
> time :: stress-highalloc 3225.51 user 732.40 system 1542.76 elapsed
> time :: stress-highalloc 3524.31 user 749.63 system 1512.88 elapsed
> time :: stress-highalloc 3610.55 user 757.20 system 1505.70 elapsed
> 
> avg system: 1519 s
> 
> That is 7% reduced system time.

Why not post the whole compare-mmtests output? There are more metrics in there and extra
eyes never hurt.

Vlastimil

> Thanks.
> 
> Joonsoo Kim (5):
>   mm/compaction: disallow high-order page for migration target
>   mm/compaction: do not call suitable_migration_target() on every page
>   mm/compaction: change the timing to check to drop the spinlock
>   mm/compaction: check pageblock suitability once per pageblock
>   mm/compaction: clean-up code on success of ballon isolation
> 
>  mm/compaction.c |   75 +++++++++++++++++++++++++++++--------------------------
>  1 file changed, 39 insertions(+), 36 deletions(-)
> 

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