linux-kernel - Re: [PATCH 08/32] nohz: Try not to give the timekeeping duty to an adaptive tickless cpu

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Message-ID: <alpine.DEB.2.00.1203210950500.20482@router.home>
Date:	Wed, 21 Mar 2012 09:52:24 -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 08/32] nohz: Try not to give the timekeeping duty to an
 adaptive tickless cpu

On Wed, 21 Mar 2012, Frederic Weisbecker wrote:

> Try to give the timekeeing duty to a CPU that doesn't belong
> to any nohz cpuset when possible, so that we increase the chance
> for these nohz cpusets to run their CPUs out of periodic tick
> mode.

Any way to manually specify which cpu? We f.e. always "sacrifice" cpu 0
for OS activities. We would like to have all Os processing things
restricted to cpu 0 so that the rest of the processors do not experience
the OS noise.
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