linux-kernel - Re: [PATCH 06/45] FS-Cache: Recruit a couple of page flags for cache management [ver #41]

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Message-ID: <18685.1227263518@redhat.com>
Date:	Fri, 21 Nov 2008 10:31:58 +0000
From:	David Howells <dhowells@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	dhowells@...hat.com, trond.myklebust@....uio.no,
	viro@...IV.linux.org.uk, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 06/45] FS-Cache: Recruit a couple of page flags for cache management [ver #41]

Andrew Morton <akpm@...ux-foundation.org> wrote:

> ow, that hurt.  Every time someone does this I ask "how many are left"
> but nobody seems to know how to work it out.

Yeah, that worries me a bit too.  That why we looked at reclaiming PG_private.
The patches to do that didn't appear to be interesting, however.

> How many are left?

It depends on the configuration, but with maximum usage, 24 are used, except
on IA64 where 25 are used.

> I'd suggest that we make PagePrivate() go away completely, to prevent
> accidental usages from sneaking back in.  If that's practical.

Well, there are still some places where PG_private does need to be checked
individually.

David
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