linux-kernel - Re: [PATCH 2/4] sched: compute runnable load avg in cpu_load and cpu_avg_load_per

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Date:	Thu, 24 Jan 2013 23:16:41 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, efault@....de,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] sched: compute runnable load avg in cpu_load and
 cpu_avg_load_per_task

On 01/24/2013 06:08 PM, Ingo Molnar wrote:
> 
> * Alex Shi <alex.shi@...el.com> wrote:
> 
>> @@ -2539,7 +2539,11 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
>>  void update_idle_cpu_load(struct rq *this_rq)
>>  {
>>  	unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
>> +#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
>> +	unsigned long load = (unsigned long)this_rq->cfs.runnable_load_avg;
>> +#else
>>  	unsigned long load = this_rq->load.weight;
>> +#endif
> 
> I'd not make it conditional - just calculate runnable_load_avg 
> all the time (even if group scheduling is disabled) and use it 
> consistently. The last thing we want is to bifurcate scheduler 
> balancer behavior even further.

Very glad to see you being back, Ingo! :)

This patch set is following my power aware scheduling patchset. But for
a separate workable runnable load engaged balancing. only needs the
other 3 patches, that already sent you at another patchset

[patch v4 06/18] sched: give initial value for runnable avg of sched
[patch v4 07/18] sched: set initial load avg of new forked task
[patch v4 08/18] Revert "sched: Introduce temporary FAIR_GROUP_SCHED


> 
> Thanks,
> 
> 	Ingo
> 


-- 
Thanks
    Alex
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