linux-kernel - Re: [RFC 6/6] ARM: sched: clear SD_SHARE

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Date:	Mon, 29 Oct 2012 14:28:46 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-dev@...ts.linaro.org, peterz@...radead.org,
	mingo@...hat.com, pjt@...gle.com, linux@....linux.org.uk
Subject: Re: [RFC 6/6] ARM: sched: clear SD_SHARE_POWERLINE

On 24 October 2012 17:21, Santosh Shilimkar <santosh.shilimkar@...com> wrote:
> On Sunday 07 October 2012 01:13 PM, Vincent Guittot wrote:
>>
>> The ARM platforms take advantage of packing small tasks on few cores.
>> This is true even when the cores of a cluster can't be powergated
>> independently.
>>
>>
>> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
>> ---
>>   arch/arm/kernel/topology.c |    5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
>> index 26c12c6..00511d0 100644
>> --- a/arch/arm/kernel/topology.c
>> +++ b/arch/arm/kernel/topology.c
>> @@ -226,6 +226,11 @@ static inline void update_cpu_power(unsigned int
>> cpuid, unsigned int mpidr) {}
>>    */
>>   struct cputopo_arm cpu_topology[NR_CPUS];
>>
>> +int arch_sd_share_power_line(void)
>> +{
>> +       return 0*SD_SHARE_POWERLINE;
>> +}
>
>
> Making this selection of policy based on sched domain will better. Just
> gives the flexibility to choose a separate scheme for big and little
> systems which will be very convenient.

I agree that it would be more flexible to be able to set it for each level

>
> Regards
> Santosh
>
>
>
>
>
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