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DateWed, 27 Feb 2008 10:33:41 +0530
FromBalbir Singh <>
SubjectRe: [RFC][PATCH] page reclaim throttle take2
Digg This
KOSAKI Motohiro wrote:
Hi

I don't think so.
all modern many cpu machine stand on NUMA.
it mean following,
- if cpu increases, then zone increases, too.

if default value increase by #cpus, lock contension dramatically increase on large numa.

Have I overlooked anything?

How about adding something like..
==
CONFIG_SIMULTANEOUS_PAGE_RECLAIMERS
int
default 3
depends on DEBUG
help
This value determines the number of threads which can do page reclaim in a zone simultaneously. If this is too big, performance under heavy memory pressure will decrease.
If unsure, use default.
==

Then, you can get performance reports from people interested in this feature in test cycle.

hm, intersting.
but sysctl parameter is more better, i think.

OK, I'll add it at next post.

I think sysctl should be interesting. The config option provides good documentation, but it is static in nature (requires reboot to change). I wish we could have the best of both worlds.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL


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