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Message-ID: <ZhQsESPi9PwpPhx7@slm.duckdns.org>
Date: Mon, 8 Apr 2024 07:40:33 -1000
From: Tejun Heo <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
Cc: Zefan Li <lizefan.x@...edance.com>,
Johannes Weiner <hannes@...xchg.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
cgroups@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Frederic Weisbecker <frederic@...nel.org>,
"Paul E. McKenney" <paulmck@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Valentin Schneider <vschneid@...hat.com>,
Anna-Maria Behnsen <anna-maria@...utronix.de>,
Alex Shi <alexs@...nel.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Michal Koutný <mkoutny@...e.com>
Subject: Re: [PATCH v2 0/2] cgroup/cpuset: Make cpuset hotplug processing
synchronous
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
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