linux-kernel - Re: [PATCH v2 0/2] cgroup/cpuset: Make cpuset hotplug processing synchronous

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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