From: Tejun Heo <tj@kernel.org>
To: Waiman Long <longman@redhat.com>
Cc: "Zefan Li" <lizefan.x@bytedance.com>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Peter Zijlstra" <peterz@infradead.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Len Brown" <len.brown@intel.com>, "Pavel Machek" <pavel@ucw.cz>,
"Shuah Khan" <shuah@kernel.org>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
linux-pm@vger.kernel.org, linux-kselftest@vger.kernel.org,
"Frederic Weisbecker" <frederic@kernel.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Valentin Schneider" <vschneid@redhat.com>,
"Anna-Maria Behnsen" <anna-maria@linutronix.de>,
"Alex Shi" <alexs@kernel.org>,
"Vincent Guittot" <vincent.guittot@linaro.org>,
"Michal Koutný" <mkoutny@suse.com>
Subject: Re: [PATCH v2 0/2] cgroup/cpuset: Make cpuset hotplug processing synchronous
Date: Mon, 8 Apr 2024 07:40:33 -1000 [thread overview]
Message-ID: <ZhQsESPi9PwpPhx7@slm.duckdns.org> (raw)
In-Reply-To: <20240404134749.2857852-1-longman@redhat.com>
On Thu, Apr 04, 2024 at 09:47:47AM -0400, Waiman Long wrote:
> v2:
> - Found that rebuild_sched_domains() has external callers, revert its
> change and introduce rebuild_sched_domains_cpuslocked() instead.
>
> As discussed in the LKML thread [1], the asynchronous nature of cpuset
> hotplug handling code is causing problem with RCU testing. With recent
> changes in the way locking is being handled in the cpuset code, it is
> now possible to make the cpuset hotplug code synchronous again without
> major changes.
>
> This series enables the hotplug code to call directly into cpuset hotplug
> core without indirection with the exception of the special case of v1
> cpuset becoming empty still being handled indirectly with workqueue.
>
> A new simple test case was also written to test this special v1 cpuset
> case. The test_cpuset_prs.sh script was also run with LOCKDEP on to
> verify that there is no regression.
Applied to cgroup/for-6.10. Hopefully, this one will work out. Thanks for
working on this.
--
tejun
prev parent reply other threads:[~2024-04-08 17:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-04 13:47 [PATCH v2 0/2] cgroup/cpuset: Make cpuset hotplug processing synchronous Waiman Long
2024-04-04 13:47 ` [PATCH v2 1/2] " Waiman Long
2024-04-08 15:22 ` Valentin Schneider
2024-04-04 13:47 ` [PATCH v2 2/2] cgroup/cpuset: Add test_cpuset_v1_hp.sh Waiman Long
2024-04-08 17:40 ` Tejun Heo [this message]
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