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From: Tejun Heo <tj@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Qais Yousef <qais.yousef@arm.com>,
	Xuewen Yan <xuewen.yan@unisoc.com>,
	rafael@kernel.org, viresh.kumar@linaro.org, mingo@redhat.com,
	juri.lelli@redhat.com, vincent.guittot@linaro.org,
	dietmar.eggemann@arm.com, rostedt@goodmis.org,
	bsegall@google.com, mgorman@suse.de, bristot@redhat.com,
	linux-kernel@vger.kernel.org, ke.wang@unisoc.com,
	xuewyan@foxmail.com, linux-pm@vger.kernel.org,
	Waiman Long <longman@redhat.com>
Subject: Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu hotplug when using schedutil
Date: Wed, 27 Jul 2022 12:05:41 -1000	[thread overview]
Message-ID: <YuG2tU1EoQmRqLjK@slm.duckdns.org> (raw)
In-Reply-To: <YuG1vwqs1GgE/twg@worktop.programming.kicks-ass.net>

Hello,

On Thu, Jul 28, 2022 at 12:01:35AM +0200, Peter Zijlstra wrote:
> On Tue, Jul 12, 2022 at 06:13:46AM -1000, Tejun Heo wrote:
> 
> > But now we're failing user-initiated operations randomly. I have a hard time
> > seeing that as an acceptable solution. 
> 
> There (sadly) is precedent for that; grep for "cpu_hotplug_disable".

Yeah, there's another one in cpu cgroup controller attach path. We should
get better at not doing these. Low frequency arbitrary failures are really
difficult to handle reliably downstream.

Thanks.

-- 
tejun

  reply	other threads:[~2022-07-27 22:05 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-05 12:37 Xuewen Yan
2022-07-11  7:21 ` Xuewen Yan
2022-07-11  7:32   ` Lukasz Luba
2022-07-11  7:43     ` Xuewen Yan
2022-07-11  7:47       ` Viresh Kumar
2022-07-11  7:50       ` Lukasz Luba
2022-07-11 17:46 ` Qais Yousef
2022-07-11 20:58   ` Tejun Heo
2022-07-11 21:11     ` Steven Rostedt
2022-07-12  5:42       ` Xuewen Yan
2022-07-12  5:57       ` Xuewen Yan
2022-07-13  3:02       ` Waiman Long
2022-07-12 12:57     ` Qais Yousef
2022-07-12 16:13       ` Tejun Heo
2022-07-12 17:14         ` Qais Yousef
2022-07-27 22:01         ` Peter Zijlstra
2022-07-27 22:05           ` Tejun Heo [this message]
2022-07-13  2:49     ` Waiman Long
2022-07-13  3:00       ` Tejun Heo
2022-07-20  7:45         ` Xuewen Yan
2022-07-27 20:09           ` Tejun Heo
2022-07-29  7:33             ` Xuewen Yan
2022-07-29  8:39               ` Qais Yousef
2022-07-29 19:59                 ` Tejun Heo
2022-08-09  2:02                   ` Xuewen Yan

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