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From: "Pan ruochen" <panruochen@gmail.com>
To: "Peter Zijlstra" <peterz@infradead.org>
Cc: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
	linux-kernel@vger.kernel.org
Subject: Re: How kernel applies LRU to swap out physical pages?
Date: Wed, 12 Nov 2008 09:36:43 +0800	[thread overview]
Message-ID: <af0faace0811111736o4b6904acx9c25e06d4ebf3421@mail.gmail.com> (raw)
In-Reply-To: <1226403220.7685.1601.camel@twins>

Thanks to all, I've have a study.

2008/11/11 Peter Zijlstra <peterz@infradead.org>:
> On Tue, 2008-11-11 at 18:56 +0900, KOSAKI Motohiro wrote:
>> > On Tue, 2008-11-11 at 16:22 +0800, Pan ruochen wrote:
>> > > Hi All,
>> > > I'm reading the linux kernel 2.6.14. But can't understand how LRU algorithm
>> > > is applied to page swapping. what is the 'USED' of LRU referred to? The
>> > > reference counter which the page is mapped by processes, or the frequency that
>> > > CPU reads/writes in the page. In common sense, the LRU algorithm will be more
>> > > optimal for the second case. But it depends on CPU capability.
>> > > I will be very appreciated if somebody can explain that in details.
>> >
>> > We don't actually use LRU but something like CLOCK.
>
> FWIW in case you hadn't found it yet:
>
>  http://en.wikipedia.org/wiki/Page_replacement_algorithm
>
> is a fairly decent page on the subject.
>

  reply	other threads:[~2008-11-12  1:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-11  8:22 Pan ruochen
2008-11-11  8:57 ` Peter Zijlstra
2008-11-11  9:56   ` KOSAKI Motohiro
2008-11-11 11:33     ` Peter Zijlstra
2008-11-12  1:36       ` Pan ruochen [this message]
2008-11-11  8:58 ` KOSAKI Motohiro

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