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

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Message-ID: <20120614111241.GA16848@somewhere>
Date:	Thu, 14 Jun 2012 13:12:46 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 Thu, Jun 14, 2012 at 11:07:09AM +0200, Peter Zijlstra wrote:
> 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..

You're right, I should have looked into CONFIG_VIRT_CPU_ACCOUNTING sooner
and see if I can reuse it.

I'll try something with that.
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