Messages in this thread | | | Date | Wed, 26 Aug 2009 12:08:09 +0100 | From | Mel Gorman <> | Subject | Re: VM issue causing high CPU loads |
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On Mon, Aug 24, 2009 at 04:21:55PM -0700, Andrew Morton wrote: > On Mon, 24 Aug 2009 16:23:22 +0200 > Yohan <kernel@yohan.staff.proxad.net> wrote: > > > Hi, > > > > Is someone have an idea for that : > > > > http://bugzilla.kernel.org/show_bug.cgi?id=14024 > > > > Please generate a kernel profile to work out where all the CPU tie is > being spent. Documentation/basic_profiling.txt is a starting point. >
In the absense of a profile, here is a total stab in the dark. Is this a NUMA machine? If so, is /proc/sys/vm/zone_reclaim_mode set to 1 and does setting it to 0 help?
This is based on a relatively recent bug where malloc() could stall for long times with large amounts of CPU usage due to useless scanning in page reclaim.
-- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab
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