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From: David Howells <dhowells@redhat.com>
In-Reply-To: <20081121001704.51e7d744.akpm@linux-foundation.org>
References: <20081121001704.51e7d744.akpm@linux-foundation.org> <20081120144139.10667.75519.stgit@warthog.procyon.org.uk> <20081120144210.10667.11143.stgit@warthog.procyon.org.uk>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: dhowells@redhat.com, trond.myklebust@fys.uio.no, viro@ZenIV.linux.org.uk,
       nfsv4@linux-nfs.org, linux-kernel@vger.kernel.org,
       linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 06/45] FS-Cache: Recruit a couple of page flags for cache management [ver #41]
Date: Fri, 21 Nov 2008 10:31:58 +0000
Message-ID: <18685.1227263518@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 922
Lines: 25

Andrew Morton <akpm@linux-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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