linux-kernel - Re: [PATCH v3 16/22] sched: add power aware scheduling in fork/exec/wake

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Date:	Mon, 14 Jan 2013 16:30:26 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Namhyung Kim <namhyung@...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, efault@....de, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 16/22] sched: add power aware scheduling in fork/exec/wake


>> +/*
>> + * Try to collect the task running number and capacity of the doamin.
>> + */
>> +static void get_sd_power_stats(struct sched_domain *sd,
>> +		struct task_struct *p, struct sd_lb_stats *sds)
>> +{
>> +	struct sched_group *group;
>> +	struct sg_lb_stats sgs;
>> +	int sd_min_delta = INT_MAX;
>> +	int cpu = task_cpu(p);
>> +
>> +	group = sd->groups;
>> +	do {
>> +		long g_delta;
>> +		unsigned long threshold;
>> +
>> +		if (!cpumask_test_cpu(cpu, sched_group_mask(group)))
>> +			continue;
> 
> Why?
> 
> That means only local group's stat will be accounted for this domain,
> right?  Is it your intension?
> 

Uh, Thanks a lot for finding this bug!
it is a mistake, should be:
+               if (!cpumask_intersects(sched_group_cpus(group),
+                                       tsk_cpus_allowed(p)))
+                       continue;

-- 
Thanks Alex
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