On Tue, 16 Sep 2008 15:46:28 +0800
"Peter Teoh" <[EMAIL PROTECTED]> wrote:

> > Anonymous (and other swap backed) pages use a simple two-handed
> > clock replacement algorithm, while file backed pages use a
> > use-once algorithm that somewhat resembles 2Q.  Pages that cannot
> > be evicted are placed on the unevictable list, to keep them out
> > of the way of the VM.
> 
> I don't quite understand this part......can someone help me out with
> the source code reference for this?   Where is this two-handed clock
> implemented?   

It's in the -mm kernel.  The mainline kernel.org tree does not
have this code (yet).

> And what is the 2Q ie, the name of the queue for this?
>  What conditions prevent them from being evicted?

http://linux-mm.org/PageReplacementDesign

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