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Date: Thu, 2 Feb 2012 11:25:51 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
Subject: Re: [v7 0/8] Reduce cross CPU IPI interference
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To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Avi Kivity <avi@redhat.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Gilad Ben-Yossef <gilad@benyossef.com>, linux-kernel@vger.kernel.org, Chris Metcalf <cmetcalf@tilera.com>, Frederic Weisbecker <fweisbec@gmail.com>, linux-mm@kvack.org, Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>, Sasha Levin <levinsasha928@gmail.com>, Rik van Riel <riel@redhat.com>, Andi Kleen <andi@firstfloor.org>, Mel Gorman <mel@csn.ul.ie>, Andrew Morton <akpm@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Michal Nazarewicz <mina86@mina86.com>, Kosaki Motohiro <kosaki.motohiro@gmail.com>, Milton Miller <miltonm@bga.com>

On Thu, 2 Feb 2012, Paul E. McKenney wrote:

> Frederic's work checks to see if there is only one runnable user task
> on a given CPU.  If there is only one, then the scheduling-clock interrupt
> is turned off for that CPU, and RCU is told to ignore it while it is
> executing in user space.  Not sure whether this covers KVM guests.
>
> In any case, this is not yet in mainline.

Sounds great. Is there any plan on when to merge it? Where are the most up
to date patches vs mainstream?

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