linux-kernel - Re: [RFD PATCH 00/10] cpuidle: Predict the next events with the IO latencies

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Message-ID: <20141030143853.GF23531@worktop.programming.kicks-ass.net>
Date:	Thu, 30 Oct 2014 15:38:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...nel.dk, rafael.j.wysocki@...el.com, mingo@...nel.org,
	preeti@...ux.vnet.ibm.com, Morten.Rasmussen@....com,
	mturquette@...aro.org, tuukka.tikkanen@...aro.org,
	nicolas.pitre@...aro.org, patches@...aro.org
Subject: Re: [RFD PATCH 00/10] cpuidle: Predict the next events with the IO
 latencies

On Wed, Oct 22, 2014 at 03:57:43PM +0200, Daniel Lezcano wrote:
> After discussing at the LPC2014 Dusseldorf, it appears the idea is
> good but the approach is wrong. The latency tracking must be done at
> the device level, per device and not in the task as what is doing this
> patchset.

end_page_writeback()->test_clear_page_writeback()->__bdi_writeout_inc()

Is the IO completion path that has a fair amount of statistics in, maybe
some of that is usable.

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