linux-kernel - Re: [PATCH 0/6] writeback: moving expire targets for background/kupdate works

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Date:	Thu, 21 Apr 2011 01:56:34 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Mel Gorman <mel@...ux.vnet.ibm.com>,
	Dave Chinner <david@...morbit.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Itaru Kitayama <kitayama@...bb4u.ne.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 0/6] writeback: moving expire targets for
 background/kupdate works

On Thu, Apr 21, 2011 at 01:50:31PM +0800, Wu Fengguang wrote:
> Hi Christoph,
> 
> On Thu, Apr 21, 2011 at 12:34:50PM +0800, Christoph Hellwig wrote:
> > Hi Wu,
> > 
> > if you're queueing up writeback changes can you look into splitting
> > inode_wb_list_lock as it was done in earlier versions of the inode
> > scalability patches?  Especially if we don't get the I/O less
> > balance_dirty_pages in ASAP it'll at least allows us to scale the
> > busy waiting for the list manipulationes to one CPU per BDI.
> 
> Do you mean to split inode_wb_list_lock into struct bdi_writeback? 
> So as to improve at least the JBOD case now and hopefully benefit the
> 1-bdi case when switching to multiple bdi_writeback per bdi in future?
> 
> I've not touched any locking code before, but it looks like some dumb
> code replacement. Let me try it :)

I can do the patch if you want, it would be useful to carry it in your
series to avoid conflicts, though.

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