Re: [PATCH 10/31] sched: Add @reason to sched_class->rq_{on|off}line()

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Subject: Re: [PATCH 10/31] sched: Add @reason to sched_class->rq_{on|off}line()
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Mon, 12 Dec 2022 12:57:36 +0100
Cc: torvalds@xxxxxxxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, juri.lelli@xxxxxxxxxx, vincent.guittot@xxxxxxxxxx, dietmar.eggemann@xxxxxxx, rostedt@xxxxxxxxxxx, bsegall@xxxxxxxxxx, mgorman@xxxxxxx, bristot@xxxxxxxxxx, vschneid@xxxxxxxxxx, ast@xxxxxxxxxx, daniel@xxxxxxxxxxxxx, andrii@xxxxxxxxxx, martin.lau@xxxxxxxxxx, joshdon@xxxxxxxxxx, brho@xxxxxxxxxx, pjt@xxxxxxxxxx, derkling@xxxxxxxxxx, haoluo@xxxxxxxxxx, dvernet@xxxxxxxx, dschatzberg@xxxxxxxx, dskarlat@xxxxxxxxxx, riel@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, kernel-team@xxxxxxxx
In-reply-to: <20221130082313.3241517-11-tj@kernel.org>

On Tue, Nov 29, 2022 at 10:22:52PM -1000, Tejun Heo wrote:
> ->rq_{on|off}line are called either during CPU hotplug or cpuset partition
> updates. Let's add an argument to distinguish the two cases. The argument
> will be used by a new sched_class to track CPU hotplug events.

Again, utter lack of why.

Follow-Ups:
- Re: [PATCH 10/31] sched: Add @reason to sched_class->rq_{on|off}line()
  - From: Tejun Heo

References:
- [PATCHSET RFC] sched: Implement BPF extensible scheduler class
  - From: Tejun Heo
- [PATCH 10/31] sched: Add @reason to sched_class->rq_{on|off}line()
  - From: Tejun Heo

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