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

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Message-ID: <20160620195643.GX3262@mtj.duckdns.org>
Date:	Mon, 20 Jun 2016 15:56:43 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Petr Mladek <pmladek@...e.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	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()

On Thu, Jun 16, 2016 at 01:17:25PM +0200, Petr Mladek wrote:
> kthread_flush_worker() returns when the currently queued works are proceed.
> But some other works might have been queued in the meantime.
> 
> This patch adds kthread_drain_worker() that is inspired by
> drain_workqueue(). It returns when the queue is completely
> empty and warns when it takes too long.
> 
> The initial implementation does not block queuing new works when
> draining. It makes things much easier. The blocking would be useful
> to debug potential problems but it is not clear if it is worth
> the complication at the moment.
> 
> Signed-off-by: Petr Mladek <pmladek@...e.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun