linux-kernel - Re: [TESTCASE] Clean pages clogging the VM

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Message-ID: <20100819210907.GA22747@localhost>
Date:	Fri, 20 Aug 2010 05:09:07 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Li, Shaohua" <shaohua.li@...el.com>
Subject: Re: [TESTCASE] Clean pages clogging the VM

On Thu, Aug 19, 2010 at 07:51:06PM +0800, Johannes Weiner wrote:
> I am currently trying to get rid of all the congestion_wait() in the VM.
> They are used for different purposes, so they need different replacement
> mechanisms.
> 
> I saw Shaohua's patch to make congestion_wait() cleverer.  But I really
> think that congestion is not a good predicate in the first place.  Why
> would the VM care about IO _congestion_?  It needs a bunch of pages to
> complete IO, whether the writing device is congested is not really
> useful information at this point, I think.

I have the same feeling that the congestion_wait() calls are not
pertinent ones.  I'm glad to see people working on that exploring
all possible replacement schemes.

Thanks,
Fengguang
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