Re: [RFC PATCH v5] sched/fair: select idle cpu from idle cpumask for task wakeup

[Peter Zijlstra]

On Wed, Nov 18, 2020 at 12:31:13PM +0800, Aubrey Li wrote:
> Add idle cpumask to track idle cpus in sched domain. When a CPU
> enters idle, if the idle driver indicates to stop tick, this CPU
> is set in the idle cpumask to be a wakeup target. And if the CPU
> is not in idle, the CPU is cleared in idle cpumask during scheduler
> tick to ratelimit idle cpumask update.

So this will only have SIS consider CPUs that have the tick stopped?
That might affect the facebook tail-latency workloads quite a bit.