Re: [RFC PATCH 2/2] sched/eevdf: Introduce a cgroup interface for slice

[Tejun Heo]

Hello,

On Mon, Oct 28, 2024 at 02:33:13PM +0800, Tianchen Ding wrote:
> Introduce "cpu.fair_slice" for cgroup v2 and "cpu.fair_slice_us" for v1
> according to their name styles. The unit is always microseconds.
> 
> A cgroup with shorter slice can preempt others more easily. This could be
> useful in container scenarios.
> 
> By default, cpu.fair_slice is 0, which means the slice of se is
> calculated by min_slice from its cfs_rq. If cpu.fair_slice is set, it
> will overwrite se->slice with the customized value.

Provided that this tunable is necessary, wouldn't it be more useful to
figure out what per-task interface would look like first? Maybe there are
cases where per-cgroup slice config makes sense but that sounds
significantly less useful than being able to configure it per-task.

Thanks.

-- 
tejun