linux-kernel - Re: [Patch v6 1/7] sched/pelt.c: Add support to track thermal pressure

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Date:   Mon, 16 Dec 2019 14:43:24 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     mingo@...hat.com, ionela.voinescu@....com,
        vincent.guittot@...aro.org, rui.zhang@...el.com,
        qperret@...gle.com, daniel.lezcano@...aro.org,
        viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
        amit.kachhap@...il.com, javi.merino@...nel.org,
        amit.kucheria@...durent.com
Subject: Re: [Patch v6 1/7] sched/pelt.c: Add support to track thermal
 pressure

On Wed, Dec 11, 2019 at 11:11:42PM -0500, Thara Gopinath wrote:
> The
> difference here from rt/dl utilization tracking is that, instead of
> tracking time spent by a cpu running a rt/dl task through util_avg, the
> average thermal pressure is tracked through load_avg. This is because
> thermal pressure signal is weighted "delta" capacity and is not
> binary(util_avg is binary). "delta capacity" here means delta between the
> actual capacity of a cpu and the decreased capacity a cpu due to a thermal
> event.

I'm thinking that ^, would make a nice adding to that v.

> +/*
> + * thermal:
> + *
> + *   load_sum = \Sum se->avg.load_sum
> + *
> + *   util_avg and runnable_load_avg are not supported and meaningless.
> + *
> + */
> +int update_thermal_load_avg(u64 now, struct rq *rq, u64 capacity)
> +{
> +	if (___update_load_sum(now, &rq->avg_thermal,
> +			       capacity,
> +			       capacity,
> +			       capacity)) {
> +		___update_load_avg(&rq->avg_thermal, 1, 1);
> +		trace_pelt_thermal_tp(rq);
> +		return 1;
> +	}
> +
> +	return 0;
> +}