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

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Date:	Thu, 21 Apr 2011 13:50:31 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	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

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 :)

Thanks,
Fengguang
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