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Subject: Re: [PATCH 3/5] writeback: dirty rate control
From: Peter Zijlstra <peterz@infradead.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: linux-fsdevel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
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Date: Tue, 09 Aug 2011 18:56:56 +0200
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	 <20110806094526.878435971@intel.com>
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On Sat, 2011-08-06 at 16:44 +0800, Wu Fengguang wrote:
>              bdi->dirty_ratelimit = (bw * 3 + ref_bw) / 4;

I can't actually find this low-pass filter in the code.. could be I'm
blind from staring at it too long though..