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

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Date:	Tue, 8 May 2012 10:18:46 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Frederic Weisbecker <fweisbec@...il.com>,
	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>,
	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, 8 May 2012, Peter Zijlstra wrote:

> There's no such policy, but I don't get why Christoph objects to
> cpusets, its the option I would prefer. You're going to use cpusets
> anyway to partition your system, might as well also use it to mark a
> whole partition/set as nohz.

We are currently not using cpusets but are simply isolating processors as
needed. Not sure that I want the overhead (administratively as well as in
kernel) to deal with this.

Someone may be using a different partitioning technique (like cgroups) etc
and then wont be able to use nohz. Having it not depend on cpusets makes
it more universal.

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