linux-kernel - Re: [RFC PATCH 00/32] Nohz cpusets (was: Nohz Tasks)

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Message-ID: <1314786830.23993.22.camel@twins>
Date:	Wed, 31 Aug 2011 12:33:50 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Mike Galbraith <efault@....de>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 00/32] Nohz cpusets (was: Nohz Tasks)

On Wed, 2011-08-31 at 12:26 +0200, Mike Galbraith wrote:
> On Wed, 2011-08-31 at 11:28 +0200, Peter Zijlstra wrote:
> > On Wed, 2011-08-31 at 05:47 +0200, Mike Galbraith wrote:
> > > On Tue, 2011-08-30 at 16:06 +0200, Frederic Weisbecker wrote:
> > > 
> > > > Ah I haven't tested with that isolcpus especially as it's headed toward
> > > > removal.
> > > 
> > > It is?  Is it being replaced by something?  (I find it useful)
> > 
> > cpusets? Afaict all it does is not include a number of cpus in the sched
> > domains, creating a bunch of independent scheduling cpus. You can use
> > cpusets to get to the same state.
> 
> Guess I'll have to try creating a cpuset per cpu, and see how it
> compares to isolcpus.  cset shield --cpu 4-63 didn't work well enough.

You need to play with the sched_load_balance file, no idea what this
cset utility is though, never encountered it before.
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