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From: Peter Zijlstra <peterz@infradead.org>
To: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>, Qian Cai <cai@redhat.com>,
	Vincent Donnefort <vincent.donnefort@arm.com>,
	Dexuan Cui <decui@microsoft.com>,
	Lai Jiangshan <laijs@linux.alibaba.com>,
	Paul McKenney <paulmck@kernel.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH -tip V3 0/8] workqueue: break affinity initiatively
Date: Tue, 12 Jan 2021 15:53:30 +0100	[thread overview]
Message-ID: <X/236obyM0nqL5+X@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CAJhGHyA0rfR92W7T7RnhPrmLMkmV4Mb7fUSeG2VEHhsH-pSxsw@mail.gmail.com>

On Tue, Jan 12, 2021 at 12:33:03PM +0800, Lai Jiangshan wrote:
> > Well yes, but afaict the workqueue stuff hasn't been settled yet, and
> > the rcutorture patch Paul did was just plain racy and who knows what
> > other daft kthread users are out there. That and we're at -rc3.
> 
> I just send the V4 patchset for the workqueue.  Please take a look.

Yes, I've seen it. But I think this approach is smaller and simpler.

By distinguishing between geniuine per-cpu kthreads and kthreads that
happen to have a single CPU affinity, things become much simpler and
robust.

  reply	other threads:[~2021-01-12 14:55 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-26  2:51 [PATCH -tip V3 0/8] workqueue: break affinity initiatively Lai Jiangshan
2020-12-26  2:51 ` [PATCH -tip V3 1/8] workqueue: use cpu_possible_mask instead of cpu_active_mask to break affinity Lai Jiangshan
2020-12-26  2:51 ` [PATCH -tip V3 2/8] workqueue: Manually break affinity on pool detachment Lai Jiangshan
2020-12-26  2:51 ` [PATCH -tip V3 3/8] workqueue: introduce wq_online_cpumask Lai Jiangshan
2021-01-04 13:56   ` Peter Zijlstra
2021-01-05  2:41     ` Lai Jiangshan
2021-01-05  2:53       ` Lai Jiangshan
2021-01-05  8:23       ` Lai Jiangshan
2021-01-05 13:17         ` Peter Zijlstra
2021-01-05 14:37           ` Lai Jiangshan
2021-01-05 14:40             ` Lai Jiangshan
2021-01-05 16:24         ` Peter Zijlstra
2020-12-26  2:51 ` [PATCH -tip V3 4/8] workqueue: use wq_online_cpumask in restore_unbound_workers_cpumask() Lai Jiangshan
2020-12-26  2:51 ` [PATCH -tip V3 5/8] workqueue: Manually break affinity on hotplug for unbound pool Lai Jiangshan
     [not found]   ` <20201226101631.5448-1-hdanton@sina.com>
2020-12-27 14:04     ` Lai Jiangshan
2020-12-26  2:51 ` [PATCH -tip V3 6/8] workqueue: reorganize workqueue_online_cpu() Lai Jiangshan
2020-12-26  2:51 ` [PATCH -tip V3 7/8] workqueue: reorganize workqueue_offline_cpu() unbind_workers() Lai Jiangshan
2020-12-26  2:51 ` [PATCH -tip V3 8/8] workqueue: Fix affinity of kworkers when attaching into pool Lai Jiangshan
     [not found]   ` <20201229100639.2086-1-hdanton@sina.com>
2020-12-29 10:13     ` Lai Jiangshan
2021-01-08 11:46 ` [PATCH -tip V3 0/8] workqueue: break affinity initiatively Peter Zijlstra
2021-01-11 10:07   ` Thomas Gleixner
2021-01-11 11:01     ` Peter Zijlstra
2021-01-11 15:00       ` Paul E. McKenney
2021-01-11 17:16       ` Peter Zijlstra
2021-01-11 18:09         ` Paul E. McKenney
2021-01-11 21:50           ` Paul E. McKenney
2021-01-12 17:14             ` Paul E. McKenney
2021-01-12 23:53               ` Paul E. McKenney
2021-01-15  9:11                 ` Peter Zijlstra
2021-01-15 13:04                   ` Peter Zijlstra
2021-01-16  6:00                     ` Lai Jiangshan
2021-01-11 19:21         ` Valentin Schneider
2021-01-11 20:23           ` Peter Zijlstra
2021-01-11 22:47             ` Valentin Schneider
2021-01-12  4:33             ` Lai Jiangshan
2021-01-12 14:53               ` Peter Zijlstra [this message]
2021-01-12 15:38                 ` Lai Jiangshan
2021-01-13 11:10                   ` Peter Zijlstra
2021-01-13 12:00                     ` Lai Jiangshan
2021-01-13 12:57                     ` Lai Jiangshan
2021-01-12 17:52               ` Valentin Schneider
2021-01-12 14:57           ` Jens Axboe
2021-01-12 15:51             ` Peter Zijlstra

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