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Date: Thu, 21 Apr 2011 00:34:50 -0400
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 0/6] writeback: moving expire targets for
 background/kupdate works
Message-ID: <20110421043449.GA22423@infradead.org>
References: <20110419030003.108796967@intel.com>
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To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Jan Kara <jack@suse.cz>, Mel Gorman <mel@linux.vnet.ibm.com>, Dave Chinner <david@fromorbit.com>, Trond Myklebust <Trond.Myklebust@netapp.com>, Itaru Kitayama <kitayama@cl.bb4u.ne.jp>, Minchan Kim <minchan.kim@gmail.com>, LKML <linux-kernel@vger.kernel.org>, linux-fsdevel@vger.kernel.org, Linux Memory Management List <linux-mm@kvack.org>

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.

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