linux-kernel - Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

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Message-Id: <20080219160711.7E99.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue, 19 Feb 2008 16:09:07 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	kosaki.motohiro@...fujitsu.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

Hi Nick,

> Yeah this is definitely needed and a nice result.
> 
> I'm worried about a) placing a global limit on parallelism, and b)
> placing a limit on parallelism at all.

sorry, i don't understand yet.
a) and b) have any relation?

> 
> I think it should maybe be a per-zone thing...
> 
> What happens if you make it a per-zone mutex, and allow just a single
> process to reclaim pages from a given zone at a time? I guess that is
> going to slow down throughput a little bit in some cases though...

That makes sense.

OK.
I'll repost after 2-3 days.

Thanks.

- kosaki


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