linux-kernel - Re: [PATCH 07/32] cpuset: Set up interface for nohz flag

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Message-ID: <alpine.DEB.2.00.1203210949440.20482@router.home>
Date:	Wed, 21 Mar 2012 09:50:27 -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>,
	Ingo Molnar <mingo@...nel.org>,
	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>,
	Zen Lin <zen@...nhuawei.org>
Subject: Re: [PATCH 07/32] cpuset: Set up interface for nohz flag

On Wed, 21 Mar 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.

What are the drawbacks for nohz?

If there are none: Can we make nohz default behavior without relying on
cpusets?

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