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Date: Wed, 27 Feb 2008 14:13:22 +0900
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: balbir@linux.vnet.ibm.com
Subject: Re: [RFC][PATCH] page reclaim throttle take2
Cc: kosaki.motohiro@jp.fujitsu.com,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, Rik van Riel <riel@redhat.com>,
       Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
       Nick Piggin <npiggin@suse.de>
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Hi balbir-san,

> >> 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.

OK, I obey your opinion.


- kosaki