linux-kernel - Re: [PATCH 2/5] writeback: dirty position control

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Date:	Tue, 09 Aug 2011 11:31:44 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andrea Righi <arighi@...eler.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] writeback: dirty position control

On Tue, 2011-08-09 at 06:47 +0800, Wu Fengguang wrote:
> origin is where the control line crosses the X axis (in both the
> global/bdi setpoint cases). 

Ah, that's normally called zero, root or or x-intercept:

http://en.wikipedia.org/wiki/X-intercept
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