linux-kernel - Re: [RFC PATCH 0/5] Improve hugepage allocation success rates under load V3

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Message-ID: <5023CADC.801@sandia.gov>
Date:	Thu, 9 Aug 2012 08:36:12 -0600
From:	"Jim Schutt" <jaschut@...dia.gov>
To:	"Mel Gorman" <mgorman@...e.de>
cc:	Linux-MM <linux-mm@...ck.org>, "Rik van Riel" <riel@...hat.com>,
	"Minchan Kim" <minchan@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/5] Improve hugepage allocation success rates
 under load V3

Hi Mel,

On 08/09/2012 07:49 AM, Mel Gorman wrote:
> Changelog since V2
> o Capture !MIGRATE_MOVABLE pages where possible
> o Document the treatment of MIGRATE_MOVABLE pages while capturing
> o Expand changelogs
>
> Changelog since V1
> o Dropped kswapd related patch, basically a no-op and regresses if fixed (minchan)
> o Expanded changelogs a little
>
> Allocation success rates have been far lower since 3.4 due to commit
> [fe2c2a10: vmscan: reclaim at order 0 when compaction is enabled]. This
> commit was introduced for good reasons and it was known in advance that
> the success rates would suffer but it was justified on the grounds that
> the high allocation success rates were achieved by aggressive reclaim.
> Success rates are expected to suffer even more in 3.6 due to commit
> [7db8889a: mm: have order>  0 compaction start off where it left] which
> testing has shown to severely reduce allocation success rates under load -
> to 0% in one case.  There is a proposed change to that patch in this series
> and it would be ideal if Jim Schutt could retest the workload that led to
> commit [7db8889a: mm: have order>  0 compaction start off where it left].

I was successful at resolving my Ceph issue on 3.6-rc1, but ran
into some other issue that isn't immediately obvious, and prevents
me from testing your patch with 3.6-rc1.  Today I will apply your
patch series to 3.5 and test that way.

Sorry for the delay.

-- Jim

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