linux-kernel - Re: [PATCH v6 3/6] sched: add utilization_avg

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Message-ID: <20141003143634.GL2849@worktop.programming.kicks-ass.net>
Date:	Fri, 3 Oct 2014 16:36:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	preeti@...ux.vnet.ibm.com, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, riel@...hat.com,
	Morten.Rasmussen@....com, efault@....de, nicolas.pitre@...aro.org,
	linaro-kernel@...ts.linaro.org, daniel.lezcano@...aro.org,
	dietmar.eggemann@....com, pjt@...gle.com, bsegall@...gle.com
Subject: Re: [PATCH v6 3/6] sched: add utilization_avg_contrib

On Tue, Sep 23, 2014 at 06:08:02PM +0200, Vincent Guittot wrote:
> +++ b/kernel/sched/sched.h
> @@ -339,8 +339,14 @@ struct cfs_rq {
>  	 * Under CFS, load is tracked on a per-entity basis and aggregated up.
>  	 * This allows for the description of both thread and group usage (in
>  	 * the FAIR_GROUP_SCHED case).
> +	 * runnable_load_avg is the sum of the load_avg_contrib of the
> +	 * sched_entities on the rq.

> +	 * blocked_load_avg is similar to runnable_load_avg except that its
> +	 * the blocked sched_entities on the rq.

Strictly speaking blocked entities aren't on a rq as such, but yeah, no
idea how to better put it. Just being a pedantic, which isn't helpful I
guess :-)

> +	 * utilization_load_avg is the sum of the average running time of the
> +	 * sched_entities on the rq.
>  	 */

So I think there was some talk about a blocked_utilization thingy, which
would track the avg running time of the tasks currently asleep, right?

> +	unsigned long runnable_load_avg, blocked_load_avg, utilization_load_avg;
>  	atomic64_t decay_counter;
>  	u64 last_decay;
>  	atomic_long_t removed_load;
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