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From: Wu Fengguang <fengguang.wu@intel.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@linux.intel.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Li, Shaohua" <shaohua.li@intel.com>
Subject: Re: [TESTCASE] Clean pages clogging the VM
Date: Fri, 20 Aug 2010 05:09:07 +0800	[thread overview]
Message-ID: <20100819210907.GA22747@localhost> (raw)
In-Reply-To: <20100819115106.GG1779@cmpxchg.org>

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

WARNING: multiple messages have this Message-ID (diff)
From: Wu Fengguang <fengguang.wu@intel.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@linux.intel.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Li, Shaohua" <shaohua.li@intel.com>
Subject: Re: [TESTCASE] Clean pages clogging the VM
Date: Fri, 20 Aug 2010 05:09:07 +0800	[thread overview]
Message-ID: <20100819210907.GA22747@localhost> (raw)
In-Reply-To: <20100819115106.GG1779@cmpxchg.org>

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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  reply	other threads:[~2010-08-19 21:09 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-09 13:30 [TESTCASE] Clean pages clogging the VM Matthew Wilcox
2010-08-17 19:50 ` Matthew Wilcox
2010-08-17 19:50   ` Matthew Wilcox
2010-08-18 14:13   ` Johannes Weiner
2010-08-18 14:13     ` Johannes Weiner
     [not found]     ` <20100818160613.GE9431@localhost>
2010-08-18 16:07       ` Wu Fengguang
2010-08-18 16:07         ` Wu Fengguang
2010-08-19  1:42         ` Shaohua Li
2010-08-19  1:42           ` Shaohua Li
2010-08-19 11:51         ` Johannes Weiner
2010-08-19 11:51           ` Johannes Weiner
2010-08-19 21:09           ` Wu Fengguang [this message]
2010-08-19 21:09             ` Wu Fengguang
2010-08-20  5:05           ` Shaohua Li
2010-08-20  5:05             ` Shaohua Li
2010-08-18 21:26     ` Wu Fengguang
2010-08-18 21:26       ` Wu Fengguang
2010-08-19  9:18     ` KOSAKI Motohiro
2010-08-19  9:18       ` KOSAKI Motohiro

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