linux-kernel - Re: [RFC GIT PULL] nohz: Basic cputime accounting for adaptive tickless

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Message-ID: <1339664829.2559.14.camel@twins>
Date:	Thu, 14 Jun 2012 11:07:09 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	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>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Luck,Tony" <tony.luck@...el.com>
Subject: Re: [RFC GIT PULL] nohz: Basic cputime accounting for adaptive
 tickless

On Wed, 2012-06-13 at 18:19 +0200, Frederic Weisbecker wrote:
> Ingo, Thomas,
> 
> This starts the basic code that allow accounting of cputime spent tickless
> outside idle, which is a first step to prepare for the adaptive nohz
> infrastructure.
> 
> I hope we can set a tree in -tip for that. If you're fine with it
> this is pullable from:

There's a number of architecture that already does fine grained
user/kernel time accounting on syscall boundaries etc.. s390, powerpc
and ia64.

You're now adding a 3rd way of accounting user/kernel time.. I'm not
much looking fwd to that..
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