Re: [PATCH linux-next v2] sched/psi: Avoid update triggers and rtpoll_total when it is unnecessary

[Ingo Molnar]

* yang.yang29@xxxxxxxxxx <yang.yang29@xxxxxxxxxx> wrote:

> From: Yang Yang <yang.yang29@xxxxxxxxxx>
> 
> When psimon wakes up and there are no state changes for rtpoll_states,
> it's unnecessary to update triggers and rtpoll_total because the pressures
> being monitored by user have not changed. This will help to slightly reduce
> unnecessary computations of psi.
> 
> There are also some minor related optimizations, please see below.
> 
> The parameter update_total in update_triggers() is useless now. Since if
> changed_states & group->rtpoll_states is true, new_stall in update_triggers()
> will be true, then update_total should also be true. We have no need for
> update_total to help judgment whether to update rtpoll_total, so delete
> update_total.
> 
> Update_triggers() always return now + group->rtpoll_min_period, and the
> return value is only used by psi_rtpoll_work(), so change update_triggers()
> to a void function, let group->rtpoll_next_update = now +
> group->rtpoll_min_period directly.

Yeah, so please split this up into 3 patches: one change per patch, even
if each patch is relatively small.

Thanks,

	Ingo