Messages in this thread |  | | | Date | Wed, 27 Feb 2008 14:04:15 +0900 | | From | KOSAKI Motohiro <> | | Subject | Re: [RFC][PATCH] page reclaim throttle take2 | |
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.
|  |