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    SubjectRe: [RFC PATCH 0/5] Improve hugepage allocation success rates under load V3
    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!


    Mel Gorman
    SUSE Labs

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