linux-kernel - Re: [PATCH v9 06/12] kthread: Add kthread_drain

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Message-ID: <20160628170447.GE5185@htj.duckdns.org>
Date:	Tue, 28 Jun 2016 13:04:47 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Petr Mladek <pmladek@...e.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Borislav Petkov <bp@...e.de>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 06/12] kthread: Add kthread_drain_worker()

Hello,

On Mon, Jun 27, 2016 at 04:33:50PM +0200, Petr Mladek wrote:
> OK, so you suggest to do the following:
> 
>   1. Add a flag into struct kthread_worker that will prevent
>      from further queuing.

This doesn't add any protection, right?  It's getting freed anyway.

>   2. kthread_create_worker()/kthread_destroy_worker() will
>      not longer dynamically allocate struct kthread_worker.
>      They will just start/stop the kthread.

Ah, okay, I don't think we need to change this.  I was suggesting to
simplify it by dropping the draining and just do flush from destroy.

Thanks.

-- 
tejun