linux-kernel - Re: [ANNOUNCE] 3.8-rc6-nohz4

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Date:	Thu, 07 Feb 2013 11:41:20 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.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>,
	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>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [ANNOUNCE] 3.8-rc6-nohz4

On Thu, 2013-02-07 at 17:25 +0100, Frederic Weisbecker wrote:

> At least for now we seem to agree on CONFIG_NO_HZ_IDLE and keep
> CONFIG_NO_HZ for compatibility. Are you ok with that? If so I'll send
> a patch.

I believe that Ingo was suggesting to have CONFIG_NO_HZ give options to
what type of config NO_HZ you want. Something like:

config NO_HZ
	bool "Enable tickless support"

config NO_HZ_IDLE
	bool "Stop tick when CPU is idle"
	default y
	depends on NO_HZ

config NO_HZ_TASK
	bool "Stop tick on specified CPUs when single task is running"
	default n
	depends on NO_HZ

That is, if you select NO_HZ, by default NO_HZ_IDLE is also selected.
But in the kernel the NO_HZ_IDLE is used.

-- Steve


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