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From: Peter Zijlstra <peterz@infradead.org>
To: Vikram Mulukutla <markivx@codeaurora.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Srivatsa Vaddagiri <vatsa@codeaurora.org>,
	Steve Muckle <steve.muckle@linaro.org>,
	Olav Haugan <ohaugan@codeaurora.org>,
	Syed Rameez Mustafa <rameezmustafa@codeaurora.org>,
	Joonwoo Park <joonwoop@codeaurora.org>,
	Pavankumar Kondeti <pkondeti@codeaurora.org>,
	Saravana Kannan <skannan@codeaurora.org>,
	Bryan Huntsman <bryanh@codeaurora.org>,
	Juri Lelli <juri.lelli@arm.com>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Chris Redpath <chris.redpath@arm.com>,
	Robin Randhawa <robin.randhawa@arm.com>,
	Patrick Bellasi <patrick.bellasi@arm.com>,
	Todd Kjos <tkjos@google.com>,
	Srinath Sridharan <srinathsr@google.com>,
	Andres Oportus <andresoportus@google.com>,
	Leo Yan <leo.yan@linaro.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Vikram Mulukutla <markivx@codeauorora.org>
Subject: Re: [RFC PATCH 2/3] sched: Introduce Window-Assisted CPU utilization Tracking
Date: Fri, 28 Oct 2016 09:38:04 +0200	[thread overview]
Message-ID: <20161028073804.GR3102@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1477638642-17428-3-git-send-email-markivx@codeaurora.org>

On Fri, Oct 28, 2016 at 12:10:41AM -0700, Vikram Mulukutla wrote:
> +static int cpu_is_waiting_on_io(struct rq *rq)
> +{
> +	if (!walt_io_is_busy)
> +		return 0;
> +
> +	return atomic_read(&rq->nr_iowait);
> +}

This is just drug induced nonsense. The per-cpu nr_iowait number is
completely without meaning.

  reply	other threads:[~2016-10-28  7:38 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-28  7:10 [RFC PATCH 0/3] sched: Introduce Window Assisted Load Tracking Vikram Mulukutla
2016-10-28  7:10 ` [RFC PATCH 1/3] sched: Introduce structures necessary for WALT Vikram Mulukutla
2016-10-28  7:10 ` [RFC PATCH 2/3] sched: Introduce Window-Assisted CPU utilization Tracking Vikram Mulukutla
2016-10-28  7:38   ` Peter Zijlstra [this message]
2016-10-28  7:43   ` Peter Zijlstra
2016-10-28  7:58     ` Vikram Mulukutla
2016-10-28  7:46   ` Peter Zijlstra
2016-10-28  8:03     ` Vikram Mulukutla
2016-10-28  7:52   ` Peter Zijlstra
2016-10-28  7:10 ` [RFC PATCH 3/3] sched: Introduce WALT hooks into core and scheduling classes Vikram Mulukutla
2016-10-28  7:57   ` Peter Zijlstra
2016-10-28  7:29 ` [RFC PATCH 0/3] sched: Introduce Window Assisted Load Tracking Peter Zijlstra
2016-10-28  7:55   ` Vikram Mulukutla
2016-10-28  9:23     ` Peter Zijlstra
2016-10-28  7:49 ` Peter Zijlstra
2016-10-28  7:57   ` Vikram Mulukutla
2016-10-28  8:49     ` Peter Zijlstra
2016-10-31 15:07       ` Vikram Mulukutla

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