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Date: Tue, 18 Jul 2006 07:45:21 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
To: Andrew Morton <akpm@osdl.org>
cc: mbligh@mbligh.org, a.p.zijlstra@chello.nl, linux-mm@kvack.org,
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Subject: Re: [PATCH] mm: inactive-clean list
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On Tue, 18 Jul 2006, Andrew Morton wrote:

> Christoph Lameter <clameter@sgi.com> wrote:
> > What other types of non freeable pages could exist?
> 
> PageWriteback() pages (potentially all of memory)

Doesnt write throttling take care of that?

> Pinned pages (various transient conditions, mainly get_user_pages())

Hmm....
 
> Some pages whose buffers are attached to an ext3 journal.

These are just pinned by an increased refcount right?
 
> Possibly NFS unstable pages.

These are tracked by NR_NFS_UNSTABLE.

Maybe we need a NR_UNSTABLE that includes pinned pages?