From: Peter Zijlstra <peterz@infradead.org>
To: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Lai Jiangshan <jiangshan.ljs@antgroup.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Tejun Heo <tj@kernel.org>, Petr Mladek <pmladek@suse.com>,
Michal Hocko <mhocko@suse.com>,
Wedson Almeida Filho <wedsonaf@google.com>,
Valentin Schneider <vschneid@redhat.com>
Subject: Re: [RFC PATCH 1/8] workqueue: Unconditionally set cpumask in worker_attach_to_pool()
Date: Mon, 12 Sep 2022 09:54:34 +0200 [thread overview]
Message-ID: <Yx7luoAJpenWO5zK@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20220804084135.92425-2-jiangshanlai@gmail.com>
On Thu, Aug 04, 2022 at 04:41:28PM +0800, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@antgroup.com>
>
> If a worker is spuriously woken up after kthread_bind_mask() but before
> worker_attach_to_pool(), and there are some cpu-hot-[un]plug happening
> during the same interval, the worker task might be pushed away from its
> bound CPU with its affinity changed by the scheduler and worker_attach_to_pool()
> doesn't rebind it properly.
Can you *please* be more explicit. The above doesn't give me enough clue
to reconstruct the actual scenario you're fixing.
Draw a picture or something.
next prev parent reply other threads:[~2022-09-12 7:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-04 8:41 [RFC PATCH 0/8] workqueue: Fix for prematurely wakeups and cleanups Lai Jiangshan
2022-08-04 8:41 ` [RFC PATCH 1/8] workqueue: Unconditionally set cpumask in worker_attach_to_pool() Lai Jiangshan
2022-08-16 21:18 ` Tejun Heo
2022-08-18 14:39 ` Lai Jiangshan
2022-09-12 7:54 ` Peter Zijlstra [this message]
2022-08-04 8:41 ` [RFC PATCH 2/8] workqueue: Make create_worker() safe against prematurely wakeups Lai Jiangshan
[not found] ` <20220804123520.1660-1-hdanton@sina.com>
2022-08-05 2:30 ` Lai Jiangshan
2022-08-16 21:46 ` Tejun Heo
2022-08-04 8:41 ` [RFC PATCH 3/8] workqueue: Set PF_NO_SETAFFINITY instead of kthread_bind_mask() Lai Jiangshan
2022-08-04 8:41 ` [RFC PATCH 4/8] workqueue: Set/Clear PF_WQ_WORKER while attaching/detaching Lai Jiangshan
2022-08-04 8:41 ` [RFC PATCH 5/8] workqueue: Use worker_set_flags() in worker_enter_idle() Lai Jiangshan
2022-08-04 8:41 ` [RFC PATCH 6/8] workqueue: Simplify the starting of the newly created worker Lai Jiangshan
2022-08-04 8:41 ` [RFC PATCH 7/8] workqueue: Remove the outer loop in maybe_create_worker() Lai Jiangshan
2022-08-16 22:08 ` Tejun Heo
2022-08-18 14:44 ` Lai Jiangshan
2022-08-19 17:29 ` Tejun Heo
2022-08-04 8:41 ` [RFC PATCH 8/8] workqueue: Move the locking out of maybe_create_worker() Lai Jiangshan
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