Re: [PATCH 0/2] Reduce the amount of time compaction disables IRQsfor V2

From: Andrea Arcangeli
Date: Fri Feb 25 2011 - 15:08:30 EST

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 <aarcange@xxxxxxxxxx>
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