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From: Petr Mladek <pmladek@suse.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	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 0/1] kthread: don't abuse kthread_create_on_cpu() in __kthread_create_worker()
Date: Mon, 14 Nov 2016 12:09:55 +0100	[thread overview]
Message-ID: <20161114110955.GA32499@pathway.suse.cz> (raw)
In-Reply-To: <20161110171957.GA28264@redhat.com>

On Thu 2016-11-10 18:19:58, Oleg Nesterov wrote:
> On 11/09, Oleg Nesterov wrote:
> >
> > Yes, agreed. Again, I'll write another email. Perhaps we should even keep
> > park/unpark exported and change them to avoid the races with exit/itself,
> > I dunno.
> >
> > My real point was, imo the KTHREAD_IS_PER_CPU/__kthread_bind(kthread->cpu)
> > logic in kthread_unpark() should be private to smpboot.c/cpu.c.
> >
> > I'll send another patch tomorrow. kthread_create_worker_on_cpu() ab-uses
> > this logic too for no reason, but this is trivial.
> 
> After this change we are almost ready to kill kthread->cpu and KTHREAD_IS_PER_CPU.
> (but the change itself doesn't depend on the previous patches).
> 
> Petr, why do we need kthread_create_worker_on_cpu() ? It has no users and
> I can not imagine any "real" use-case for it. Perhaps it can be removed?

kthread_create_worker_on_cpu() is going to have some users. For
example, patches for intel_powerclamp are already flying around,
see
https://lkml.kernel.org/r/1476707572-32215-3-git-send-email-pmladek@suse.com

Best Regards,
Petr

  parent reply	other threads:[~2016-11-14 11:10 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
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                           ` Petr Mladek [this message]
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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