linux-kernel - Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

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Message-Id: <20070924121035.8d8c6ce2.akpm@linux-foundation.org>
Date:	Mon, 24 Sep 2007 12:10:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Dave Hansen <haveblue@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

On Mon, 24 Sep 2007 18:54:11 +0100
Christoph Hellwig <hch@...radead.org> wrote:

> As we already say in various messages the percpu counters in here
> look rather fishy.  I'd recomment to take a look at the per-cpu
> superblock counters in XFS as they've been debugged quite well
> now and could probably be lifted into a generic library for this
> kind of think.  The code is mostly in fs/xfs/xfs_mount.c can
> can be spotted by beeing under #ifdef HAVE_PERCPU_SB.
> 
> It also handles cases like hotplug cpu nicely that this code
> seems to work around by always iterating over all possible cpus
> which might not be nice on a dual core laptop with a distro kernel
> that also has to support big iron.

hm.  How come xfs invented a new version of percpu_counters?
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