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

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Date:	Thu, 09 Jul 2015 17:55:03 +0100
From:	Juri Lelli <juri.lelli@....com>
To:	Michael Turquette <mturquette@...libre.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...hat.com" <mingo@...hat.com>
CC:	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	"yuyang.du@...el.com" <yuyang.du@...el.com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"sgurrappadi@...dia.com" <sgurrappadi@...dia.com>,
	"pang.xunlei@....com.cn" <pang.xunlei@....com.cn>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [RFCv5 PATCH 45/46] sched/cpufreq_sched: modify pcpu_capacity
 handling

Hi Mike,

On 08/07/15 17:42, Michael Turquette wrote:
> 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.
> 

Thanks for reviewing it! :)

Best,

- Juri

> 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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