linux-kernel - Re: [RFC 4/4] sched: add per group cpu_power

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Date:	Tue, 1 Apr 2014 13:11:11 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Mike Galbraith <efault@....de>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>
Subject: Re: [RFC 4/4] sched: add per group cpu_power_orig

On 1 April 2014 12:41, Preeti U Murthy <preeti@...ux.vnet.ibm.com> wrote:
> Hi Vincent,
>
> On 03/28/2014 06:57 PM, Vincent Guittot wrote:
>> This new field cpu_power_orig reflects the available capacity of a CPUs unlike
>> the cpu_power which reflects the current capacity that can be altered by
>> frequency and rt tasks.
>>
>> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
>
> Should not the subject be "add per rq cpu_power_orig"?

yes you're right :-)
I don't know how i came to that subject... a quick and dirty
copy/paste of something else

thanks
Vincent

>
> Regards
> Preeti U Murthy
>> ---
>>  kernel/sched/core.c  | 2 +-
>>  kernel/sched/fair.c  | 1 +
>>  kernel/sched/sched.h | 1 +
>>  3 files changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>> index 5b20b27..8513f83 100644
>> --- a/kernel/sched/core.c
>> +++ b/kernel/sched/core.c
>> @@ -6911,7 +6911,7 @@ void __init sched_init(void)
>>  #ifdef CONFIG_SMP
>>               rq->sd = NULL;
>>               rq->rd = NULL;
>> -             rq->cpu_power = SCHED_POWER_SCALE;
>> +             rq->cpu_power = rq->cpu_power_orig = SCHED_POWER_SCALE;
>>               rq->post_schedule = 0;
>>               rq->active_balance = 0;
>>               rq->next_balance = jiffies;
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index 7387c05..f1e4db6 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -5611,6 +5611,7 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)
>>
>>       power >>= SCHED_POWER_SHIFT;
>>
>> +     cpu_rq(cpu)->cpu_power_orig = power;
>>       sdg->sgp->power_orig = power;
>>
>>       if (sched_feat(ARCH_POWER))
>> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
>> index 46c3784..2abdf5c 100644
>> --- a/kernel/sched/sched.h
>> +++ b/kernel/sched/sched.h
>> @@ -578,6 +578,7 @@ struct rq {
>>       struct sched_domain *sd;
>>
>>       unsigned long cpu_power;
>> +     unsigned long cpu_power_orig;
>>
>>       unsigned char idle_balance;
>>       /* For active balancing */
>>
>
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