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

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Message-ID: <20110421043449.GA22423@infradead.org>
Date:	Thu, 21 Apr 2011 00:34:50 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
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 Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 0/6] writeback: moving expire targets for
 background/kupdate works

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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