linux-kernel - Re: [RFC PATCH 3/10] define page_file

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Date:	Wed, 7 Nov 2007 10:18:48 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Rik van Riel <riel@...hat.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH 3/10] define page_file_cache

On Wed, 7 Nov 2007, Rik van Riel wrote:

> On Wed, 7 Nov 2007 10:06:10 -0800 (PST)
> Christoph Lameter <clameter@....com> wrote:
> 
> > On Wed, 7 Nov 2007, Rik van Riel wrote:
> > 
> > > How exactly can an anonymous page ever become file backed?
> > 
> > When they get assigned a swap entry.
> 
> That does not change their status.  They're still swap backed.

If they are swap backed then they have a backing store on disk. They are 
file backed in some sense.

> > > > Do ramfs pages count as memory backed?
> > > 
> > > Since ramfs pages cannot be evicted from memory at all, they
> > > should go into the "noreclaim" page set.
> > 
> > Which LRU do they go on.
> 
> With the patch set from last weekend, the file LRU.

Argh.

> With the patch set later this week, they'll be in the 
> "noreclaim" page set, which is never scanned by the VM.

That sounds better.

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