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

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Message-Id: <20080227153614.425B.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 27 Feb 2008 15:52:39 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	kosaki.motohiro@...fujitsu.com,
	David Rientjes <rientjes@...gle.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

> Things are changing, with memory hot-add remove, CPU hotplug , the topology can
> change and is no longer static. One can create fake NUMA nodes on the fly using
> a boot option as well.

agreed.

> Since we're talking of parallel reclaims, I think it's a function of CPUs and
> Nodes. I'd rather keep it as a sysctl with a good default value based on the
> topology. If we end up getting it wrong, the system administrator has a choice.
> That is better than expecting him/her to recompile the kernel and boot that. A
> sysctl does not create problems either w.r.t changing the number of threads, no
> hard to solve race-conditions - it is fairly straight forward

sorry, I don't understand yet.
I think my patch is already function of CPUs and Nodes.
per zone limit indicate propotional #cpus and #nodes.

please tell me the topology that per zone limit doesn't works so good.

I think boot option and sysctl should be used only while -mm
for get various feedback.
end up, we should select more better default, and remove sysctl.


- kosaki


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