linux-kernel - Re: [PATCH 1/4] sched/topology: SD_ASYM

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Message-ID: <20180910082111.GA48257@gmail.com>
Date:   Mon, 10 Sep 2018 10:21:11 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Morten Rasmussen <morten.rasmussen@....com>
Cc:     peterz@...radead.org, mingo@...hat.com, valentin.schneider@....com,
        dietmar.eggemann@....com, vincent.guittot@...aro.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/4] sched/topology: SD_ASYM_CPUCAPACITY flag detection


* Morten Rasmussen <morten.rasmussen@....com> wrote:

> The SD_ASYM_CPUCAPACITY sched_domain flag is supposed to mark the
> sched_domain in the hierarchy where all cpu capacities are visible for
> any cpu's point of view on asymmetric cpu capacity systems. The

>  /*
> + * Find the sched_domain_topology_level where all cpu capacities are visible
> + * for all cpus.
> + */

> +	/*
> +	 * Examine topology from all cpu's point of views to detect the lowest
> +	 * sched_domain_topology_level where a highest capacity cpu is visible
> +	 * to everyone.
> +	 */

>  #define SD_WAKE_AFFINE               0x0020  /* Wake task to waking CPU */
> -#define SD_ASYM_CPUCAPACITY  0x0040  /* Groups have different max cpu capacities */
> +#define SD_ASYM_CPUCAPACITY  0x0040  /* Domain members have different cpu capacities */

For future reference: *please* capitalize 'CPU' and 'CPUs' in future patches like the rest of 
the scheduler does.

You can see it spelled right above the new definition: 'waking CPU' ;-)

(I fixed this up in this patch.)

Thanks!

	Ingo