From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, jiangshanlai@gmail.com,
valentin.schneider@arm.com, cai@redhat.com,
vincent.donnefort@arm.com, decui@microsoft.com,
paulmck@kernel.org, vincent.guittot@linaro.org,
rostedt@goodmis.org, tj@kernel.org
Subject: Re: [PATCH 0/8] sched: Fix hot-unplug regressions
Date: Sat, 16 Jan 2021 16:25:58 +0100 [thread overview]
Message-ID: <YAMFhsXamvCT2tzM@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210116113033.608340773@infradead.org>
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.
next prev parent reply other threads:[~2021-01-16 17:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-16 11:30 [PATCH 0/8] sched: Fix hot-unplug regressions Peter Zijlstra
2021-01-16 11:30 ` [PATCH 1/8] sched/core: Print out straggler tasks in sched_cpu_dying() Peter Zijlstra
2021-01-16 11:30 ` [PATCH 2/8] workqueue: Use cpu_possible_mask instead of cpu_active_mask to break affinity Peter Zijlstra
2021-01-16 11:30 ` [PATCH 3/8] sched: Dont run cpu-online with balance_push() enabled Peter Zijlstra
2021-01-16 15:27 ` Peter Zijlstra
2021-01-16 11:30 ` [PATCH 4/8] kthread: Extract KTHREAD_IS_PER_CPU Peter Zijlstra
2021-01-16 11:30 ` [PATCH 5/8] workqueue: Tag bound workers with KTHREAD_IS_PER_CPU Peter Zijlstra
2021-01-16 11:30 ` [PATCH 6/8] workqueue: Restrict affinity change to rescuer Peter Zijlstra
2021-01-16 11:30 ` [PATCH 7/8] sched: Fix CPU hotplug / tighten is_per_cpu_kthread() Peter Zijlstra
2021-01-17 16:57 ` Valentin Schneider
2021-01-18 9:30 ` Peter Zijlstra
2021-01-16 11:30 ` [PATCH 8/8] sched: Relax the set_cpus_allowed_ptr() semantics Peter Zijlstra
2021-01-16 14:39 ` Lai Jiangshan
2021-01-16 15:19 ` Peter Zijlstra
2021-01-16 15:25 ` Peter Zijlstra [this message]
2021-01-16 15:45 ` [PATCH 0/8] sched: Fix hot-unplug regressions Paul E. McKenney
2021-01-16 18:51 ` Peter Zijlstra
2021-01-16 15:48 ` Paul E. McKenney
2021-01-18 5:28 ` Paul E. McKenney
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