Subject: Re: [PATCH] nfs: fix congestion control
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Christoph Lameter <clameter@sgi.com>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org
In-Reply-To: <1169070886.6523.8.camel@lade.trondhjem.org>
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	 <1169070763.5975.70.camel@lappy>
	 <1169070886.6523.8.camel@lade.trondhjem.org>
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Date: Thu, 18 Jan 2007 14:27:48 +0100
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On Wed, 2007-01-17 at 16:54 -0500, Trond Myklebust wrote:
> On Wed, 2007-01-17 at 22:52 +0100, Peter Zijlstra wrote:
> 
> > > 
> > > > Index: linux-2.6-git/fs/inode.c
> > > > ===================================================================
> > > > --- linux-2.6-git.orig/fs/inode.c	2007-01-12 08:03:47.000000000 +0100
> > > > +++ linux-2.6-git/fs/inode.c	2007-01-12 08:53:26.000000000 +0100
> > > > @@ -81,6 +81,7 @@ static struct hlist_head *inode_hashtabl
> > > >   * the i_state of an inode while it is in use..
> > > >   */
> > > >  DEFINE_SPINLOCK(inode_lock);
> > > > +EXPORT_SYMBOL_GPL(inode_lock);
> > > 
> > > Hmmm... Commits to all NFS servers will be globally serialized via the 
> > > inode_lock?
> > 
> > Hmm, right, thats not good indeed, I can pull the call to
> > nfs_commit_list() out of that loop.
> 
> There is no reason to modify any of the commit stuff. Please just drop
> that code.

I though you agreed to flushing commit pages when hitting the dirty page
limit.

Or would you rather see a notifier chain from congestion_wait() calling
into the various NFS mounts?

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