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SubjectRe: [RESEND PATCH] sched/fair: consider RT/IRQ pressure in select_idle_sibling
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On 02/09/2018 01:53 PM, Peter Zijlstra wrote:
> On Mon, Jan 29, 2018 at 03:27:09PM -0800, Rohit Jain wrote:

[...]

>> @@ -6173,8 +6183,15 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
>> return -1;
>> if (!cpumask_test_cpu(cpu, &p->cpus_allowed))
>> continue;
>> + if (idle_cpu(cpu)) {
>> + if (full_capacity(cpu)) {
>> + best_cpu = cpu;
>> + break;
>> + } else if (capacity_of(cpu) > best_cap) {
>> + best_cap = capacity_of(cpu);
>> + best_cpu = cpu;
>> + }
>> + }
>
> No need for the else. And you'll note you're once again inconsistent
> with your previous self.
>
> But here I worry about big.little a wee bit. I think we're allowed big
> and little cores on the same L3 these days, and you can't directly
> compare capacity between them.
>
> Morten / Dietmar, any comments?

Yes, for DynamIQ (big.little successor) systems, those cpus can have
different capacity_orig_of() values already.

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