linux-kernel - Re: [PATCH v5 09/12] sched: add usage_load

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Message-ID: <20140911111736.GV3190@worktop.ger.corp.intel.com>
Date:	Thu, 11 Sep 2014 13:17:36 +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
Subject: Re: [PATCH v5 09/12] sched: add usage_load_avg

On Tue, Aug 26, 2014 at 01:06:52PM +0200, Vincent Guittot wrote:
> index 5c2c885..7dfd584 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1073,10 +1073,10 @@ struct sched_avg {
>  	 * above by 1024/(1-y).  Thus we only need a u32 to store them for all
>  	 * choices of y < 1-2^(-32)*1024.
>  	 */
> -	u32 runnable_avg_sum, runnable_avg_period;
> +	u32 runnable_avg_sum, runnable_avg_period, running_avg_sum;

Seeing how we use runnable_avg_period for both runnable and running,
does it make sense to remove the runnable part of it from the name?

Also, 4 byte hole here, not sure we've got anything useful to stuff in
it though.

>  	u64 last_runnable_update;
>  	s64 decay_count;
> -	unsigned long load_avg_contrib;
> +	unsigned long load_avg_contrib, usage_avg_contrib;
>  };
>  

Man, I should go look at Yuyang's rewrite of this all again. I just
tried to figure out the decay stuff and my head hurts ;-)
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