From mboxrd@z Thu Jan  1 00:00:00 1970
From: 'Christoph Hellwig' <hch@lst.de>
Subject: Re: Regression caused by using node_to_bdi()
Date: Mon, 13 Apr 2015 19:32:57 +0200
Message-ID: <20150413173257.GA14616@lst.de>
References: <016d01d07380$fc37fc40$f4a7f4c0$@cn.fujitsu.com>
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Cc: 'Christoph Hellwig' <hch@lst.de>, linux-fsdevel@vger.kernel.org,
	'Jan Kara' <jack@suse.cz>, 'Jens Axboe' <axboe@fb.com>,
	'LKML' <linux-kernel@vger.kernel.org>
To: Zhao Lei <zhaolei@cn.fujitsu.com>
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Tejun posted a series last week that moves node_to_bdi back inline
to -fsdevel.

Can you apply patches 1-18 of the series

"[PATCHSET 1/3 v3 block/for-4.1/core] writeback: cgroup writeback support"

and see if that helps your benchmark?