Re: kswapd0: excessive CPU usage

On Fri, Nov 09, 2012 at 09:07:45AM +0100, Zdenek Kabelac wrote:

quoted

fe2c2a106663130a5ab45cb0e3414b52df2fff0c is the first bad commit
commit fe2c2a106663130a5ab45cb0e3414b52df2fff0c
Author: Rik van Riel [off-list ref]
Date:   Wed Mar 21 16:33:51 2012 -0700

    vmscan: reclaim at order 0 when compaction is enabled
...

This is plausible since the issue seems to be in the kswapd + compaction
realm.  I've yet to figure out exactly what about this commit results in
kswapd spinning.

I would be interested if someone can confirm this finding.

--
Seth

On my system 3.7-rc4 the problem seems to be effectively solved by
revert patch: https://lkml.org/lkml/2012/11/5/308

Ok, while there is still a question on whether it's enough I think it's
sensible to at least start with the obvious one.

Thanks very much.

-- 
Mel Gorman
SUSE Labs

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>