linux-kernel - Re: [PATCH 0/2] rcu: Extended quiescent state for adaptive nohz

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Message-ID: <20120604181313.GL2490@linux.vnet.ibm.com>
Date:	Mon, 4 Jun 2012 11:13:13 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	fweisbec@...il.com
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.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 0/2] rcu: Extended quiescent state for adaptive nohz

On Mon, Jun 04, 2012 at 02:08:26PM +0200, fweisbec@...il.com wrote:
> From: Frederic Weisbecker <fweisbec@...il.com>
> 
> Paul, Ingo,
> 
> This is a rebase of the nohz cpusets RCU APIs on top of Paul's latest
> -rcu (rcu/core) branch.
> 
> I have only built tested it yet, I need to do a full rebase of my
> tree to test it in practice. But I wanted to show you how it looks
> like first.
> 
> I also wonder if we can set that to a tree somewhere. Ingo suggested
> to set up a tree on -tip to apply the uncontroversial part of nohz
> cpusets patches and iterate from there. I think it would accelerate
> everything if we start doing that.

It would probably be best to put these two in the -rcu set in order to
avoid conflicts with possible further RCU_FAST_NO_HZ work.  I could
push this to -tip early, if that would help.

							Thanx, Paul

> Tell me what you think.
> 
> Thanks.
> 
> Frederic Weisbecker (2):
>   rcu: New rcu_user_enter() and rcu_user_exit() APIs
>   rcu: New rcu_user_enter_irq() and rcu_user_exit_irq() APIs
> 
>  include/linux/rcupdate.h |    4 +
>  kernel/rcutree.c         |  184 +++++++++++++++++++++++++++++++++++++++------
>  2 files changed, 163 insertions(+), 25 deletions(-)
> 
> -- 
> 1.7.5.4
> 
> --
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