linux-kernel - Re: [PATCH 00/32] [RFC] nohz/cpuset: Start discussions on nohz CPUs

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Message-ID: <CAFTL4hxnZezg6b+HhNtiE7stku2NB8C1eh-9q18POy3GMQhuig@mail.gmail.com>
Date:	Mon, 5 Nov 2012 23:41:57 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clark.williams@...il.com>,
	Li Zefan <lizf@...fujitsu.com>, Ingo Molnar <mingo@...nel.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 00/32] [RFC] nohz/cpuset: Start discussions on nohz CPUs

2012/11/5 Christoph Lameter <cl@...ux.com>:
> On Fri, 2 Nov 2012, Paul E. McKenney wrote:
>
>> On Fri, Nov 02, 2012 at 04:51:50PM -0400, Steven Rostedt wrote:
>> > On Fri, 2012-11-02 at 13:41 -0700, Paul E. McKenney wrote:
>> >
>> > > The no-CBs mask would be read-only for some time -- changed only at
>> > > boot.  Longer term, I hope to allow run-time modification, but...
>> >
>> > but what? You're not looking to retire already are you? ;-)
>>
>> Not for a few decades.  ;-)
>>
>> But let's add the no-CBs mask to sysfs when I add the ability to run-time
>> modify that mast.
>
> Well we are creating a user ABi with the boot time option. It would be
> best to get it right out of the door.

I believe that a static setting through a boot option is a nice first
step already. Runtime tuning may involve dynamic migration and other
headaches. The nocb patch is tricky enough to review ;)
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