From: Mel Gorman <mgorman@suse.de>
To: Jim Schutt <jaschut@sandia.gov>
Cc: Linux-MM <linux-mm@kvack.org>, Rik van Riel <riel@redhat.com>,
Minchan Kim <minchan@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 0/5] Improve hugepage allocation success rates under load V3
Date: Thu, 9 Aug 2012 15:51:41 +0100 [thread overview]
Message-ID: <20120809145141.GH12690@suse.de> (raw)
In-Reply-To: <5023CADC.801@sandia.gov>
On Thu, Aug 09, 2012 at 08:36:12AM -0600, Jim Schutt wrote:
> 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.
>
No need to be sorry at all. I appreciate you taking the time and as
there were revisions since V1 you were better off waiting even if you
did not have the Ceph issue!
Thanks.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2012-08-09 14:51 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-09 13:49 [RFC PATCH 0/5] Improve hugepage allocation success rates under load V3 Mel Gorman
2012-08-09 13:49 ` [PATCH 1/5] mm: compaction: Update comment in try_to_compact_pages Mel Gorman
2012-08-09 13:49 ` [PATCH 2/5] mm: vmscan: Scale number of pages reclaimed by reclaim/compaction based on failures Mel Gorman
2012-08-10 8:49 ` Minchan Kim
2012-08-09 13:49 ` [PATCH 3/5] mm: compaction: Capture a suitable high-order page immediately when it is made available Mel Gorman
2012-08-09 23:35 ` Minchan Kim
2012-08-09 13:49 ` [PATCH 4/5] mm: have order > 0 compaction start off where it left Mel Gorman
2012-08-09 13:49 ` [PATCH 5/5] mm: have order > 0 compaction start near a pageblock with free pages Mel Gorman
2012-08-09 14:36 ` [RFC PATCH 0/5] Improve hugepage allocation success rates under load V3 Jim Schutt
2012-08-09 14:51 ` Mel Gorman [this message]
2012-08-09 18:16 ` Jim Schutt
2012-08-09 20:46 ` Mel Gorman
2012-08-09 22:38 ` Jim Schutt
2012-08-10 11:02 ` Mel Gorman
2012-08-10 17:20 ` Jim Schutt
2012-08-12 20:22 ` Mel Gorman
2012-08-13 20:35 ` Jim Schutt
2012-08-14 9:23 ` Mel Gorman
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