linux-kernel - Re: [PATCH] mm: inactive-clean list

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Message-ID: <Pine.LNX.4.64.0607180742580.31065@schroedinger.engr.sgi.com>
Date:	Tue, 18 Jul 2006 07:45:21 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...l.org>
cc:	mbligh@...igh.org, a.p.zijlstra@...llo.nl, linux-mm@...ck.org,
	torvalds@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: inactive-clean list

On Tue, 18 Jul 2006, Andrew Morton wrote:

> Christoph Lameter <clameter@....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?
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