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Date: Mon, 5 Nov 2012 23:41:57 +0100
Message-ID: <CAFTL4hxnZezg6b+HhNtiE7stku2NB8C1eh-9q18POy3GMQhuig@mail.gmail.com>
Subject: Re: [PATCH 00/32] [RFC] nohz/cpuset: Start discussions on nohz CPUs
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Steven Rostedt <rostedt@goodmis.org>, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Clark Williams <clark.williams@gmail.com>,
        Li Zefan <lizf@cn.fujitsu.com>, Ingo Molnar <mingo@kernel.org>,
        Mike Galbraith <efault@gmx.de>
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2012/11/5 Christoph Lameter <cl@linux.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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