From: Tejun Heo <tj@kernel.org>
To: Petr Mladek <pmladek@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Josh Triplett <josh@joshtriplett.org>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jiri Kosina <jkosina@suse.cz>, Borislav Petkov <bp@suse.de>,
Michal Hocko <mhocko@suse.cz>,
linux-mm@kvack.org, Vlastimil Babka <vbabka@suse.cz>,
live-patching@vger.kernel.org, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC v2 07/18] kthread: Allow to cancel kthread work
Date: Fri, 2 Oct 2015 15:24:53 -0400 [thread overview]
Message-ID: <20151002192453.GA7564@mtj.duckdns.org> (raw)
In-Reply-To: <20151002154336.GC3122@pathway.suse.cz>
Hello,
On Fri, Oct 02, 2015 at 05:43:36PM +0200, Petr Mladek wrote:
> IMHO, we need both locks. The worker manipulates more works and
> need its own lock. We need work-specific lock because the work
> might be assigned to different workers and we need to be sure
> that the operations are really serialized, e.g. queuing.
I don't think we need per-work lock. Do we have such usage in kernel
at all? If you're worried, let the first queueing record the worker
and trigger warning if someone tries to queue it anywhere else. This
doesn't need to be full-on general like workqueue. Let's make
reasonable trade-offs where possible.
Thanks.
--
tejun
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next prev parent reply other threads:[~2015-10-02 19:24 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 13:03 [RFC v2 00/18] kthread: Use kthread worker API more widely Petr Mladek
2015-09-21 13:03 ` [RFC v2 01/18] kthread: Allow to call __kthread_create_on_node() with va_list args Petr Mladek
2015-09-21 13:03 ` [RFC v2 02/18] kthread: Add create_kthread_worker*() Petr Mladek
2015-09-22 18:20 ` Tejun Heo
2015-09-21 13:03 ` [RFC v2 03/18] kthread: Add drain_kthread_worker() Petr Mladek
2015-09-22 18:26 ` Tejun Heo
2015-09-21 13:03 ` [RFC v2 04/18] kthread: Add destroy_kthread_worker() Petr Mladek
2015-09-22 18:30 ` Tejun Heo
2015-09-21 13:03 ` [RFC v2 05/18] kthread: Add pending flag to kthread work Petr Mladek
2015-09-21 13:03 ` [RFC v2 06/18] kthread: Initial support for delayed " Petr Mladek
2015-09-21 13:03 ` [RFC v2 07/18] kthread: Allow to cancel " Petr Mladek
2015-09-22 19:35 ` Tejun Heo
2015-09-25 11:26 ` Petr Mladek
2015-09-28 17:03 ` Tejun Heo
2015-10-02 15:43 ` Petr Mladek
2015-10-02 19:24 ` Tejun Heo [this message]
2015-10-05 10:07 ` Petr Mladek
2015-10-05 11:09 ` Petr Mladek
2015-10-07 9:21 ` Petr Mladek
2015-10-07 14:24 ` Tejun Heo
2015-10-14 10:20 ` Petr Mladek
2015-10-14 17:30 ` Tejun Heo
2015-09-21 13:03 ` [RFC v2 08/18] kthread: Allow to modify delayed " Petr Mladek
2015-09-21 13:03 ` [RFC v2 09/18] mm/huge_page: Convert khugepaged() into kthread worker API Petr Mladek
2015-09-22 20:26 ` Tejun Heo
2015-09-23 9:50 ` Petr Mladek
2015-09-21 13:03 ` [RFC v2 10/18] ring_buffer: Do no not complete benchmark reader too early Petr Mladek
2015-09-21 13:03 ` [RFC v2 11/18] ring_buffer: Fix more races when terminating the producer in the benchmark Petr Mladek
2015-09-21 13:03 ` [RFC v2 12/18] ring_buffer: Convert benchmark kthreads into kthread worker API Petr Mladek
2015-09-21 13:03 ` [RFC v2 13/18] rcu: Finish folding ->fqs_state into ->gp_state Petr Mladek
2015-09-21 13:03 ` [RFC v2 14/18] rcu: Store first_gp_fqs into struct rcu_state Petr Mladek
2015-09-21 13:03 ` [RFC v2 15/18] rcu: Clean up timeouts for forcing the quiescent state Petr Mladek
2015-09-21 13:03 ` [RFC v2 16/18] rcu: Check actual RCU_GP_FLAG_FQS when handling " Petr Mladek
2015-09-21 13:03 ` [RFC v2 17/18] rcu: Convert RCU gp kthreads into kthread worker API Petr Mladek
2015-09-28 17:14 ` Paul E. McKenney
2015-10-01 15:43 ` Petr Mladek
2015-10-01 16:33 ` Paul E. McKenney
2015-09-21 13:03 ` [RFC v2 18/18] kthread: Better support freezable kthread workers Petr Mladek
2015-09-22 20:32 ` [RFC v2 00/18] kthread: Use kthread worker API more widely Tejun Heo
2015-09-30 5:08 ` Paul E. McKenney
2015-10-01 15:59 ` Petr Mladek
2015-10-01 17:00 ` Paul E. McKenney
2015-10-02 12:00 ` Petr Mladek
2015-10-02 13:59 ` Paul E. McKenney
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