linux-kernel - Re: [PATCH 3/3 V8] workqueue: Allow modifying low level unbound workqueue cpumask

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Message-ID: <553F6189.2070405@cn.fujitsu.com>
Date:	Tue, 28 Apr 2015 18:31:37 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Tejun Heo <tj@...nel.org>
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 3/3 V8] workqueue: Allow modifying low level unbound workqueue
 cpumask

On 04/28/2015 12:36 PM, Mike Galbraith wrote:
> On Mon, 2015-04-27 at 23:44 -0400, Tejun Heo wrote:
> 
>>> So, we need an API to modify the wq_unbound_cpumask, and I provided
>>> this public function.  Otherwise, the other code can't modify it.
>>
>> I see.  I don't have too strong an opinion; however, changing the mask
>> is a fairly heavy operation.  Are there specific reasons why we don't
>> want to follow the nohz config right away?
> 
> Isolation is not only applicable to nohz_full.  Many loads are
> unsuitable for nohz_full, yet require maximum isolation.
> 
> ATM, nohz_full is not dynamic, but hopefully one day will be.  In the
> here and now, we can isolate cores from the scheduler on the fly via
> cpusets, a prime API user candidate.
> 
> 	-Mike
> 


So, the public function needs to be kept and the EXPORT_SYMBOL_GPL()
is killed?

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