From: Thomas Gleixner <tglx@linutronix.de>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
Roman Pen <roman.penyaev@profitbricks.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Tejun Heo <tj@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Chunming Zhou <David1.Zhou@amd.com>,
Alex Deucher <alexander.deucher@amd.com>
Subject: Re: [PATCH 1/2] kthread: don't use to_live_kthread() in kthread_stop()
Date: Wed, 9 Nov 2016 08:58:36 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.20.1611090857280.3501@nanos> (raw)
In-Reply-To: <20161031200754.GB19430@redhat.com>
On Mon, 31 Oct 2016, Oleg Nesterov wrote:
> kthread_stop() had to use to_live_kthread() simply because it was not
> possible to access kthread->exited after the exiting kthread clears
> task_struct->vfork_done. Now that to_kthread() is always valid we can
> do wake_up_process() + wait_for_completion() unconditionally, we don't
> care if it has already passed complete_vfork_done() or even dead.
>
> The exiting kthread can get the spurious wakeup after mm_release() but
> this is possible without this change too and this is fine, do_task_dead()
> ensures that this can't make any harm.
>
> Note: we can even change this function to use task_work_add() and avoid
> ->vfork_done altogether, probably we will do this later.
>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
next prev parent reply other threads:[~2016-11-09 8:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-25 11:05 [PATCH v3 1/1] kthread: allocate kthread structure using kmalloc Roman Pen
2016-10-25 14:03 ` Oleg Nesterov
2016-10-25 15:43 ` Oleg Nesterov
2016-10-25 16:08 ` Roman Penyaev
2016-10-25 16:17 ` Oleg Nesterov
2016-10-25 16:52 ` Andy Lutomirski
2016-10-26 14:14 ` Oleg Nesterov
2016-10-26 14:57 ` Thomas Gleixner
2016-10-26 15:51 ` Oleg Nesterov
2016-10-26 18:31 ` Thomas Gleixner
2016-10-28 16:11 ` [PATCH 0/2] kthread: make struct kthread kmalloc'ed Oleg Nesterov
2016-10-28 16:11 ` [PATCH 1/2] " Oleg Nesterov
2016-10-28 18:48 ` Thomas Gleixner
2016-10-28 16:12 ` [PATCH 2/2] Revert "kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function" Oleg Nesterov
2016-10-28 18:49 ` Thomas Gleixner
2016-10-28 18:44 ` [PATCH 0/2] kthread: make struct kthread kmalloc'ed Thomas Gleixner
2016-10-31 20:07 ` [PATCH 0/2] kthread: kill to_live_kthread() Oleg Nesterov
2016-10-31 20:07 ` [PATCH 1/2] kthread: don't use to_live_kthread() in kthread_stop() Oleg Nesterov
2016-11-09 7:58 ` Thomas Gleixner [this message]
2016-10-31 20:08 ` [PATCH 2/2] kthread: don't use to_live_kthread() in kthread_park() and kthread_unpark() Oleg Nesterov
2016-11-09 8:45 ` Thomas Gleixner
2016-11-09 17:27 ` Oleg Nesterov
2016-11-10 17:19 ` [PATCH 0/1] kthread: don't abuse kthread_create_on_cpu() in __kthread_create_worker() Oleg Nesterov
2016-11-10 17:20 ` [PATCH 1/1] " Oleg Nesterov
2016-11-14 11:12 ` Petr Mladek
2016-11-14 11:09 ` [PATCH 0/1] " Petr Mladek
2016-11-07 18:23 ` [PATCH 0/2] kthread: kill to_live_kthread() Andy Lutomirski
2016-10-26 16:13 ` [PATCH v3 1/1] kthread: allocate kthread structure using kmalloc Oleg Nesterov
2016-10-27 2:56 ` Josh Poimboeuf
2016-10-27 13:10 ` Oleg Nesterov
2016-10-25 15:46 ` Roman Penyaev
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