linux-kernel - Re: [PATCH 07/41] cpuset: Set up interface for nohz flag

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Message-ID: <alpine.DEB.2.00.1205071053070.1060@router.home>
Date:	Mon, 7 May 2012 10:55:03 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	linaro-sched-sig@...ts.linaro.org,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 07/41] cpuset: Set up interface for nohz flag

On Tue, 1 May 2012, Frederic Weisbecker wrote:

> Prepare the interface to implement the nohz cpuset flag.
> This flag, once set, will tell the system to try to
> shutdown the periodic timer tick when possible.
>
> We use here a per cpu refcounter. As long as a CPU
> is contained into at least one cpuset that has the
> nohz flag set, it is part of the set of CPUs that
> run into adaptive nohz mode.

As I have said before: It would be much simpler if one could specify the
set of nohz cpus independently of cpusets. Having a flag f.e. as a file in

	/sys/devices/system/cpu/cpuX/nohz

?

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