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Date: Tue, 26 Mar 2013 13:39:08 +0100
Message-ID: <CAFTL4hwc_Wy6T5f52sdwvjdS=FVJr5Ra9jM5fwYCmyANRYZt-g@mail.gmail.com>
Subject: Re: [GIT PULL] nohz: Full dynticks base interface
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Chris Metcalf <cmetcalf@tilera.com>, Christoph Lameter <cl@linux.com>,
        Geoff Levand <geoff@infradead.org>,
        Gilad Ben Yossef <gilad@benyossef.com>,
        Hakan Akkan <hakanakkan@gmail.com>, Kevin Hilman <khilman@linaro.org>,
        Li Zhong <zhong@linux.vnet.ibm.com>,
        Namhyung Kim <namhyung.kim@lge.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>
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2013/3/26 Ingo Molnar <mingo@kernel.org>:
>
> * Frederic Weisbecker <fweisbec@gmail.com> wrote:
>
>> > That way I will be able to test it automatically via randconfig and
>> > such.
>>
>> Sure, I'm adding such an option.
>>
>> > My next question/request after that would be: could we make sure that
>> > enabling this option does not break any applications or kernel
>> > functionality, ASAP? Once that is offered, it becomes pushable to
>> > v3.10 I think.
>>
>> So that's already the case. I'm careful that, as we iterate, the changes
>> aren't supposed to break something in the middle. the final code that
>> eventually shuts the tick down should be the last one in the series:
>> once we know it is safe to do so.
>
> I mean, with the .config (or boot) option enabled, with tip:timers/nohz
> as-is, will everything work? We cannot push a feature to Linus that
> doesn't work reliably when enabled ...

Right. So indeed the feature is not implemented yet in
tip:timers/nohz, ie: the tick won't be stopped. But the current
halfway state is not supposed to break existing things.

But I agree.
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