linux-kernel - Re: [v7 0/8] Reduce cross CPU IPI interference

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Message-ID: <20120201184045.GG2382@linux.vnet.ibm.com>
Date:	Wed, 1 Feb 2012 10:40:45 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Gilad Ben-Yossef <gilad@...yossef.com>,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Frederic Weisbecker <fweisbec@...il.com>, linux-mm@...ck.org,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Avi Kivity <avi@...hat.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Kosaki Motohiro <kosaki.motohiro@...il.com>,
	Milton Miller <miltonm@....com>
Subject: Re: [v7 0/8] Reduce cross CPU IPI interference

On Wed, Feb 01, 2012 at 06:35:22PM +0100, Peter Zijlstra wrote:
> On Sun, 2012-01-29 at 10:25 +0200, Gilad Ben-Yossef wrote:
> > 
> > If this is of interest, I keep a list tracking global IPI and global
> > task schedulers sources in the core kernel here:
> > https://github.com/gby/linux/wiki. 
> 
> You can add synchronize_.*_expedited() to the list, it does its best to
> bash the entire machine in order to try and make RCU grace periods
> happen fast.

I have duly added "Make synchronize_sched_expedited() avoid IPIing idle
CPUs" to http://kernel.org/pub/linux/kernel/people/paulmck/rcutodo.html.

This should not be hard once I have built up some trust in the new
RCU idle-detection code.  It would also automatically apply to
Frederic's dyntick-idle userspace work.

							Thanx, Paul

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