Re: [PATCH 5/9] sched/hotplug: Consolidate task migration on CPU unplug

[Vincent Donnefort]

On Mon, Sep 21, 2020 at 06:36:02PM +0200, Peter Zijlstra wrote:

[...]

> +
> +     [CPUHP_AP_SCHED_WAIT_EMPTY] = {
> +             .name                   = "sched:waitempty",
> +             .startup.single         = NULL,
> +             .teardown.single        = sched_cpu_wait_empty,
> +     },
> +
>       /* Handle smpboot threads park/unpark */

Unless I missed something, now that the wait has its own HP step, this
patch can probably also get rid of the balance_hotplug_wait() in
sched_cpu_deactivate() introduced by: 

  [PATCH 4/9] sched/core: Wait for tasks being pushed away on hotplug

-- 
Vincent