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

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Message-ID: <20120614130425.GC16848@somewhere>
Date:	Thu, 14 Jun 2012 15:04:29 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.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>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.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 02:48:15PM +0200, Martin Schwidefsky wrote:
> On Thu, 14 Jun 2012 13:22:45 +0200
> Frederic Weisbecker <fweisbec@...il.com> wrote:
> 
> > On Thu, Jun 14, 2012 at 01:21:23PM +0200, Thomas Gleixner wrote:
> > > On Thu, 14 Jun 2012, Ingo Molnar wrote:
> > > > * Frederic Weisbecker <fweisbec@...il.com> wrote:
> > > > > 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.
> > > > 
> > > > Maybe sanitize all the variants under a single set of 
> > > > wrappers/callbacks?
> > > 
> > > Yes, please!
> > 
> > Sure, I'm working in it.
>  
> Please keep me in the loop, I want to avoid that things break on s390. Thanks.

Well, I realize I can't consolidate much between ia64, s390 and ppc because they
all handle virtual cpu time accounting very differently. I'm also not what the
virtual timer is for.

Also it seems only powerpc flushes the time when a task is descheduled. May be
I'm missing something.
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