linux-kernel - Re: [RFCv5 PATCH 45/46] sched/cpufreq_sched: modify pcpu

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Message-ID: <20150708164235.9112.55369@quantum>
Date:	Wed, 08 Jul 2015 09:42:35 -0700
From:	Michael Turquette <mturquette@...libre.com>
To:	Morten Rasmussen <morten.rasmussen@....com>, peterz@...radead.org,
	mingo@...hat.com
Cc:	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	"Dietmar Eggemann" <Dietmar.Eggemann@....com>, yuyang.du@...el.com,
	rjw@...ysocki.net, "Juri Lelli" <Juri.Lelli@....com>,
	sgurrappadi@...dia.com, pang.xunlei@....com.cn,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	"Juri Lelli" <juri.lelli@....com>
Subject: Re: [RFCv5 PATCH 45/46] sched/cpufreq_sched: modify pcpu_capacity handling

Quoting Morten Rasmussen (2015-07-07 11:24:28)
> From: Juri Lelli <juri.lelli@....com>
> 
> Use the cpu argument of cpufreq_sched_set_cap() to handle per_cpu writes,
> as the thing can be called remotely (e.g., from load balacing code).
> 
> cc: Ingo Molnar <mingo@...hat.com>
> cc: Peter Zijlstra <peterz@...radead.org>
> 
> Signed-off-by: Juri Lelli <juri.lelli@....com>

Looks good to me. Feel free to add my Reviewed-by or Acked-by as
appropriate.

Regards,
Mike

> ---
>  kernel/sched/cpufreq_sched.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/cpufreq_sched.c b/kernel/sched/cpufreq_sched.c
> index 06ff183..b81ac779 100644
> --- a/kernel/sched/cpufreq_sched.c
> +++ b/kernel/sched/cpufreq_sched.c
> @@ -151,7 +151,7 @@ void cpufreq_sched_set_cap(int cpu, unsigned long capacity)
>         unsigned long capacity_max = 0;
>  
>         /* update per-cpu capacity request */
> -       __this_cpu_write(pcpu_capacity, capacity);
> +       per_cpu(pcpu_capacity, cpu) = capacity;
>  
>         policy = cpufreq_cpu_get(cpu);
>         if (IS_ERR_OR_NULL(policy)) {
> -- 
> 1.9.1
> 
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