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

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Message-ID: <ZyFIHrpq1F8G0Tv1@slm.duckdns.org>
Date: Tue, 29 Oct 2024 10:39:58 -1000
From: Tejun Heo <tj@...nel.org>
To: Tianchen Ding <dtcccc@...ux.alibaba.com>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>
Subject: Re: [RFC PATCH 2/2] sched/eevdf: Introduce a cgroup interface for
 slice

Hello,

On Tue, Oct 29, 2024 at 02:49:51PM +0800, Tianchen Ding wrote:
...
> At the same time, the user may want to decide his processes inside the
> container. He may want to set customized value (sched_attr::sched_runtime)
> for each process, and administrator should not overwrite the user's own
> config.
> 
> So cpu.fair_slice is for preempt competition across cgroups in the samle
> level, while sched_attr::sched_runtime can be used for processes inside the
> same cgroup. (a bit like cpu.weight vs task NICE)

I see. It's setting the slice for the task_groups. I'm not sure how much we
want to codify the current recursive behavior into fixed interface. Besides,
it's not sustainable to keep adding scheduler tunables to cgroup interface.

Thanks.

-- 
tejun