linux-kernel - Re: How kernel applies LRU to swap out physical pages?

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Date:	Tue, 11 Nov 2008 17:58:16 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Pan ruochen" <panruochen@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org
Subject: Re: How kernel applies LRU to swap out physical pages?

Hi

> Hi All,
> I'm reading the linux kernel 2.6.14. 

it seems too old.
I recommend to read newest kernel.

> 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.

I recommend to read page_referenced() and its related function :)



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