linux-kernel - Re: [GIT PULL] nohz: Adaptively stop the tick, finally

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Message-ID: <20130425062830.GA15989@gmail.com>
Date:	Thu, 25 Apr 2013 08:28:30 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.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>,
	Oleg Nesterov <oleg@...hat.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>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [GIT PULL] nohz: Adaptively stop the tick, finally


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> >         depends on VIRT_CPU_ACCOUNTING_GEN
> > 
> > It should _really_ select both the RCU and the CPU time accounting model 
> > automatically!
> 
> Yeah I know. I have yet to fix that in Kconfig (it's a Kconfig limitation).

Why cannot we simply select it and its dependencies, explicitly, for the 
time being? Something like:

	depends on 64BIT
	select VIRT_CPU_ACCOUNTING
	select VIRT_CPU_ACCOUNTING_GEN

90% of the .config's have VIRT_CPU_ACCOUNTING_GEN turned off, because it's 
a default-off feature - so dynticks-full is effectively hidden from the 
large majority of testers...

Thanks,

	Ingo
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