From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Juri Lelli <juri.lelli@redhat.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
rcu@vger.kernel.org, linux-doc@vger.kernel.org,
"John Ogness" <john.ogness@linutronix.de>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Vincent Guittot" <vincent.guittot@linaro.org>,
"Dietmar Eggemann" <dietmar.eggemann@arm.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Ben Segall" <bsegall@google.com>, "Mel Gorman" <mgorman@suse.de>,
"Valentin Schneider" <vschneid@redhat.com>,
"K Prateek Nayak" <kprateek.nayak@amd.com>,
"luca abeni" <luca.abeni@santannapisa.it>,
"Yuri Andriaccio" <yurand2000@gmail.com>,
"Yuri Andriaccio" <yuri.andriaccio@santannapisa.it>,
"Frederic Weisbecker" <frederic@kernel.org>,
"Neeraj Upadhyay" <neeraj.upadhyay@kernel.org>,
"Joel Fernandes" <joelagnelf@nvidia.com>,
"Josh Triplett" <josh@joshtriplett.org>,
"Boqun Feng" <boqun@kernel.org>,
"Uladzislau Rezki" <urezki@gmail.com>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Lai Jiangshan" <jiangshanlai@gmail.com>,
Zqiang <qiang.zhang@linux.dev>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Tejun Heo" <tj@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Koutný" <mkoutny@suse.com>,
"Qais Yousef" <qyousef@layalina.io>
Subject: Re: [PATCH v2 0/7] sched: RT throttling cleanup and a bit of documentation
Date: Thu, 12 Nov 2026 16:24:46 +0100 [thread overview]
Message-ID: <20261112152446.r1FzXVCR@linutronix.de> (raw)
In-Reply-To: <avXUstjABxdTZaxM@jlelli-thinkpadt14gen4.remote.csb>
On 2026-11-12 16:01:06 [+0100], Juri Lelli wrote:
> Hello,
Hi,
> I wonder if this fixes is
>
> https://lore.kernel.org/lkml/20261108185406.1549770-6-mathieu.desnoyers@efficios.com/
Looks like it.
I delayed the update to the thread which runs on the CPU and replaced
the cpu_online() check with cpu_active(). It still aborts if it is not
up. The other alternative is to skip sched_init_dl_servers() with
RCU_TORTURE built-in.
Side note: If you boot a 4 CPU system with maxcpus=2 then CPU 2+3 is
offline. You can online them manually. sched_init_dl_servers() will not
initialise them.
> Thanks,
> Juri
Sebastian
prev parent reply other threads:[~2026-11-12 15:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-10 17:34 Sebastian Andrzej Siewior
2026-11-10 17:34 ` [PATCH v2 1/7] sched: Mark RT_GROUP_SCHED broken Sebastian Andrzej Siewior
2026-11-10 17:42 ` Randy Dunlap
2026-11-11 13:37 ` Sebastian Andrzej Siewior
2026-11-11 16:54 ` Randy Dunlap
2026-11-10 17:34 ` [PATCH v2 2/7] rcutorture: Don't try to disable to RT throttling Sebastian Andrzej Siewior
2026-11-10 17:34 ` [PATCH v2 3/7] sched: rcutorture: Allow to disable DL fair_server Sebastian Andrzej Siewior
2026-11-10 17:34 ` [PATCH v2 4/7] sched: Move DL's admission control to sysfs Sebastian Andrzej Siewior
2026-11-10 17:34 ` [PATCH v2 5/7] sched: Limit sysctl sched_rt_{period|runtime}_us to RT_GROUP_SCHED Sebastian Andrzej Siewior
2026-11-10 17:34 ` [PATCH v2 6/7] sched: Add sysfs files for the per-CPU fair_server knobs Sebastian Andrzej Siewior
2026-11-10 17:34 ` [PATCH v2 7/7] Documentation/sched: Add fairserver to sched-deadline Sebastian Andrzej Siewior
2026-11-10 19:56 ` [PATCH v2 0/7] sched: RT throttling cleanup and a bit of documentation Paul E. McKenney
2026-11-12 15:01 ` Juri Lelli
2026-11-12 15:24 ` Sebastian Andrzej Siewior [this message]
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