Messages in this thread | | | Date | Tue, 15 Mar 2022 10:04:55 +0800 | Subject | Re: [External] Re: Subject: [PATCH] sched/fair: prioritize normal task over sched_idle task with vruntime offset | From | chenying <> |
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在 2022/3/15 8:30, Josh Don 写道: > On Sun, Mar 13, 2022 at 3:07 AM chenying <chenying.kernel@bytedance.com> 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).
I think this may not guarantee that latency sensitive tasks are always to the left of idle tasks. And it may get complicated if a latency-sensitive task is woken up onto a cpu which there are already multiple latency-sensitive tasks and sched_idle tasks.
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