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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next prev parent reply other threads:[~2010-08-19 21:09 UTC|newest]
Thread overview: 10+ 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
2010-08-18 14:13 ` Johannes Weiner
[not found] ` <20100818160613.GE9431@localhost>
2010-08-18 16:07 ` Wu Fengguang
2010-08-19 1:42 ` Shaohua Li
2010-08-19 11:51 ` Johannes Weiner
2010-08-19 21:09 ` Wu Fengguang [this message]
2010-08-20 5:05 ` Shaohua Li
2010-08-18 21:26 ` Wu Fengguang
2010-08-19 9:18 ` KOSAKI Motohiro
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