[PATCH 0/2] Reduce the amount of time compaction disables IRQs for V2

From: Mel Gorman
Date: Fri Feb 25 2011 - 15:05:48 EST

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(-)


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