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    SubjectRe: [PATCH 0/2] Reduce the amount of time compaction disables IRQs for V2
    On Fri, Feb 25, 2011 at 08:04:57PM +0000, Mel Gorman wrote:
    > Changelog since V1
    > o Fix initialisation of isolated (Andrea)
    > The following two patches are aimed at reducing the amount of time IRQs are
    > disabled. It was reported by some ALSA people that transparent hugepages was
    > causing slowdowns on MIDI playback but I strongly suspect that compaction
    > running for smaller orders was also a factor. The theory was that IRQs
    > were being disabled for too long and sure enough, compaction was found to
    > be disabling IRQs for a long time. The patches reduce the length of time
    > IRQs are disabled when scanning for free pages and for pages to migrate.
    > It's late in the cycle but the IRQs disabled times are sufficiently bad
    > that it would be desirable to have these merged for 2.6.38 if possible.
    > mm/compaction.c | 35 ++++++++++++++++++++++++++++++-----
    > 1 files changed, 30 insertions(+), 5 deletions(-)

    both patches:

    Acked-by: Andrea Arcangeli <>

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