linux-kernel - Re: [PATCH 04/41] nohz: Move nohz load balancer selection into idle logic

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Message-ID: <alpine.DEB.2.00.1205071049040.1060@router.home>
Date:	Mon, 7 May 2012 10:51:04 -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 04/41] nohz: Move nohz load balancer selection into idle
 logic

On Tue, 1 May 2012, Frederic Weisbecker wrote:

> [ ** BUGGY PATCH: I need to put more thinking into this ** ]
>
> We want the nohz load balancer to be an idle CPU, thus
> move that selection to strict dyntick idle logic.

An idle cpu? We may want to put it on a busy cpu that is running high
latency OS tasks. Would it be possible to have an option where we can pin
the load balancer to a specific cpu?
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