linux-kernel - Re: [GIT PULL] nohz: Full dynticks base interface

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Message-ID: <20130326081527.GA27128@gmail.com>
Date:	Tue, 26 Mar 2013 09:15:27 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [GIT PULL] nohz: Full dynticks base interface


* Frederic Weisbecker <fweisbec@...il.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 ...

Thanks,

	Ingo
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