linux-kernel - Re: [RFC PATCH 2/3] sched: Introduce Window-Assisted CPU utilization Tracking

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Message-ID: <20161028075225.GV3102@twins.programming.kicks-ass.net>
Date:   Fri, 28 Oct 2016 09:52:25 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vikram Mulukutla <markivx@...eaurora.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Srivatsa Vaddagiri <vatsa@...eaurora.org>,
        Steve Muckle <steve.muckle@...aro.org>,
        Olav Haugan <ohaugan@...eaurora.org>,
        Syed Rameez Mustafa <rameezmustafa@...eaurora.org>,
        Joonwoo Park <joonwoop@...eaurora.org>,
        Pavankumar Kondeti <pkondeti@...eaurora.org>,
        Saravana Kannan <skannan@...eaurora.org>,
        Bryan Huntsman <bryanh@...eaurora.org>,
        Juri Lelli <juri.lelli@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Chris Redpath <chris.redpath@....com>,
        Robin Randhawa <robin.randhawa@....com>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Todd Kjos <tkjos@...gle.com>,
        Srinath Sridharan <srinathsr@...gle.com>,
        Andres Oportus <andresoportus@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Vikram Mulukutla <markivx@...eauorora.org>
Subject: Re: [RFC PATCH 2/3] sched: Introduce Window-Assisted CPU utilization
 Tracking

On Fri, Oct 28, 2016 at 12:10:41AM -0700, Vikram Mulukutla wrote:
> +static int account_cpu_busy_time(struct rq *rq, struct task_struct *p,
> +				     u64 irqtime, int event)
> +{
> +	if (is_idle_task(p)) {
> +		/* TASK_WAKE && TASK_MIGRATE is not possible on idle task! */
> +		if (event == PICK_NEXT_TASK)
> +			return 0;
> +
> +		/* PUT_PREV_TASK, TASK_UPDATE && IRQ_UPDATE are left */
> +		return irqtime || cpu_is_waiting_on_io(rq);
> +	}
> +
> +	if (event == TASK_WAKE)
> +		return 0;
> +
> +	if (event == PUT_PREV_TASK || event == IRQ_UPDATE ||
> +					 event == TASK_UPDATE)
> +		return 1;
> +
> +	/* Only TASK_MIGRATE && PICK_NEXT_TASK left */
> +	return walt_freq_account_wait_time;
> +}

switch() wasn't an option?