From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>,
linux-kernel@vger.kernel.org, Christoph Lameter <cl@linux.com>,
Kevin Hilman <khilman@linaro.org>,
Mike Galbraith <bitbucket@online.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH 3/3 V8] workqueue: Allow modifying low level unbound workqueue cpumask
Date: Tue, 28 Apr 2015 06:36:44 +0200 [thread overview]
Message-ID: <1430195804.3168.19.camel@gmail.com> (raw)
In-Reply-To: <20150428034440.GC2152@htj.duckdns.org>
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
next prev parent reply other threads:[~2015-04-28 4:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-27 9:58 [PATCH 0/3 V8] workqueue: Introduce low-level unbound wq sysfs cpumask Lai Jiangshan
2015-04-27 9:58 ` [PATCH 1/3 V8] workqueue: split apply_workqueue_attrs() into 3 stages Lai Jiangshan
2015-04-27 9:58 ` [PATCH 2/3 V8] workqueue: Create low-level unbound workqueues cpumask Lai Jiangshan
2015-04-27 15:45 ` Tejun Heo
2015-04-27 9:58 ` [PATCH 3/3 V8] workqueue: Allow modifying low level unbound workqueue cpumask Lai Jiangshan
2015-04-27 16:07 ` Tejun Heo
2015-04-28 1:44 ` Lai Jiangshan
2015-04-28 2:24 ` Lai Jiangshan
2015-04-28 3:49 ` Tejun Heo
2015-04-28 10:16 ` Lai Jiangshan
2015-04-30 9:23 ` Lai Jiangshan
2015-04-28 3:44 ` Tejun Heo
2015-04-28 4:36 ` Mike Galbraith [this message]
2015-04-28 10:31 ` Lai Jiangshan
2015-04-28 12:15 ` Mike Galbraith
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