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