On Mon, Aug 08, 2011 at 10:31:49PM +0800, Peter Zijlstra wrote: > On Mon, 2011-08-08 at 22:11 +0800, Wu Fengguang wrote: > > It's actually dead code because (origin < limit) should never happen. > > I feel so good being able to drop 5 more lines of code :) > > OK, but that leaves me trying to figure out what origin is, and why its > 4 * thresh. origin is where the control line crosses the X axis (in both the global/bdi setpoint cases). "4 * thresh" is merely something larger than max(dirty, thresh) that yields reasonably gentle slope. The more slope, the larger "gravity" to bring the dirty pages back to the setpoint. > I'm having a horrible time understanding this stuff. Sorry for that. Do you have more questions? Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
