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

[Peter Zijlstra]

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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