linux-kernel - Re: [PATCH 2/4] workqueue: reuse the current per-node pwq when its attrs are unchanged

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Message-ID: <20150604010547.GK20091@mtj.duckdns.org>
Date:	Thu, 4 Jun 2015 10:05:47 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] workqueue: reuse the current per-node pwq when its
 attrs are unchanged

On Wed, Jun 03, 2015 at 10:29:50PM +0800, Lai Jiangshan wrote:
> If the cpumask is changed, it is possible that only a part of the per-node
> pwq is affected.  This can happen when the user changes the cpumask of
> a workqueue or the low level cpumask.
> 
> So we try to reuse the current per-node pwq when its attrs are unchanged.
> 
> In wq_update_unbound_numa(), we had already made the current pwq be
> reused when its attrs are unaffected, but we move the code of fetching
> current pwq closer to the code of testing.
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>

This one looks good to me.

Thanks.

-- 
tejun
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