linux-kernel - Re: [PATCH 0/8] sched: Fix hot-unplug regressions

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Date:   Sat, 16 Jan 2021 16:25:58 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, jiangshanlai@...il.com,
        valentin.schneider@....com, cai@...hat.com,
        vincent.donnefort@....com, decui@...rosoft.com, paulmck@...nel.org,
        vincent.guittot@...aro.org, rostedt@...dmis.org, tj@...nel.org
Subject: Re: [PATCH 0/8] sched: Fix hot-unplug regressions

On Sat, Jan 16, 2021 at 12:30:33PM +0100, Peter Zijlstra wrote:
> Hi,
> 
> These patches (no longer 4), seems to fix all the hotplug regressions as per
> nearly a 100 18*SRCU-P runs over-night.
> 
> I did clean up the patches, so possibly I wrecked it again. I've started new
> runs and will again leave them running over-night.

Hurph... I've got one splat from this version, one I've not seen before:

[   68.712848] Dying CPU not properly vacated!
...
[   68.744448] CPU1 enqueued tasks (2 total):
[   68.745018]  pid: 14, name: rcu_preempt
[   68.745557]  pid: 18, name: migration/1

Paul, rcu_preempt, is from rcu_spawn_gp_kthread(), right? Afaict that
doesn't even have affinity.. /me wonders HTH that ended up on the
runqueue so late.