Re: [External] Re: Subject: [PATCH] sched/fair: prioritize normal task over sched_idle task with vruntime offset

[Josh Don]

On Sun, Mar 13, 2022 at 3:07 AM chenying <chenying.kernel@xxxxxxxxxxxxx> wrote:
>
> If I set the sched_idle_vruntime_offset to a relatively small value
> (e.g. 10 minutes), can this issues be avoided?

That's still long enough to cause lockups.

Is the issue that you have a large number of sched_idle entities, and
the occasional latency sensitive thing that wakes up for a short
duration? Have you considered approaching this from the other
direction (ie. if we have a latency sensitive thing wake onto a cpu
running only sched idle stuff, we could change entity placement to
position the latency sensitive thing further left on the timeline,
akin to !GENTLE_FAIR_SLEEPERS).