linux-kernel - Re: [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box)

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Message-ID: <20110725225154.GD22133@ZenIV.linux.org.uk>
Date:	Mon, 25 Jul 2011 23:51:54 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matthew Wilcox <matthew@....cx>,
	Anton Blanchard <anton@...ba.org>, npiggin@...nel.dk,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [Patch] VFS : mount lock scalability for files systems without
 mount point   (WAS vfsmount lock issues on very large ppc64 box)

On Mon, Jul 25, 2011 at 03:39:10PM -0700, Tim Chen wrote:
> On Sat, 2011-07-23 at 09:24 -0400, Christoph Hellwig wrote:
> > I think you actually want this done in kern_mount_data, as both
> > ipc and proc want long-term references as well.  I also suspect with
> > additional creep of container awareness more internal mounts will switch
> > to kern_mount_data.  Al, what do you think about simply passing the
> > private data argument to kern_mount and kill kern_mount_data?  It's not
> > like the additional argument is going to cause us any pain.
> > 
> > 
> 
> I've updated the patch and merged mnt_make_longterm into
> kern_mount_data to address your comments.  I've left the kern_mount
> and kern_mount_data as separate functions for now.  Let me know
> if removing kern_mount_data is preferable instead.

It's mostly merged in mainline already...  BTW, you forgot to export
that sucker - mtdchar can be modular.
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