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SubjectRe: [PATCH 3/5] sched/fair: rework load_balance
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On 26/07/2019 15:47, Vincent Guittot wrote:
[...]
>> If CPU0 runs the load balancer, balancing utilization would mean pulling
>> 2 tasks from CPU1 to reach the domain-average of 40%. The good side of this
>> is that we could save ourselves from running some newidle balances, but
>> I'll admit that's all quite "finger in the air".
>
> Don't forget that scheduler also selects a cpu when task wakeup and
> should cope with such situation
>

Right, although I'm not sure even the slow wakeup path is any good at
balancing utilization.

>>
>>>> happen, but it'd be a shame to repeatedly do this when we could
>>>> preemptively balance utilization.
>>>>

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