linux-kernel - Re: [RFC][PATCH] page reclaim throttle take2

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Message-Id: <20080227141227.424F.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 27 Feb 2008 14:13:22 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	kosaki.motohiro@...fujitsu.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [RFC][PATCH] page reclaim throttle take2

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


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