linux-kernel - Re: [PATCH 10/31] sched: Add @reason to sched_class->rq

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Date:   Mon, 12 Dec 2022 08:06:55 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     torvalds@...ux-foundation.org, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...nel.org, joshdon@...gle.com, brho@...gle.com,
        pjt@...gle.com, derkling@...gle.com, haoluo@...gle.com,
        dvernet@...a.com, dschatzberg@...a.com, dskarlat@...cmu.edu,
        riel@...riel.com, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH 10/31] sched: Add @reason to
 sched_class->rq_{on|off}line()

On Mon, Dec 12, 2022 at 12:57:36PM +0100, Peter Zijlstra wrote:
> 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.

sched_ext wants to tell the BPF scheduler about CPU hotplugs in a way that's
synchronized with rq state changes, so it needs to distinguish the two
cases. Will update the description.

Thanks.

-- 
tejun