linux-kernel - Re: [PATCH 2/4 V6] workqueue: split apply_workqueue

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Message-ID: <20150406153921.GC10582@htj.duckdns.org>
Date:	Mon, 6 Apr 2015 11:39:21 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Kevin Hilman <khilman@...aro.org>,
	Mike Galbraith <bitbucket@...ine.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 2/4 V6] workqueue: split apply_workqueue_attrs() into 3
 stages

On Thu, Apr 02, 2015 at 07:14:40PM +0800, Lai Jiangshan wrote:
> The patch doesn't have functionality changed except two minor adjustment:
> 	1) free_unbound_pwq() for the error path is removed, we use the
> 	   heavier version put_pwq_unlocked() instead since the error path
> 	   is rare. this adjustment simplifies the code.
> 	2) the memory-allocation is also moved into wq_pool_mutex.
> 	   this is needed to avoid to do the further splitting.

And we're dropping online_cpus locking before applying the new pwq's.
Is that safe?

Thanks.

-- 
tejun
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