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

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Date:	Fri, 25 Jan 2013 09:03:31 +0800
From:	Alex Shi <lkml.alex@...il.com>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, 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 Thu, Jan 24, 2013 at 11:16 PM, Alex Shi <alex.shi@...el.com> wrote:
> 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

You's right, Ingo! the last revert patch missed above 2 points.
I will resend new patches with full version.
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