Message-ID: <1339665015.2559.16.camel@twins>
Subject: Re: [RFC GIT PULL] nohz: Basic cputime accounting for adaptive
 tickless
From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>,
        Alessio Igor Bogani <abogani@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>, Avi Kivity <avi@redhat.com>,
        Chris Metcalf <cmetcalf@tilera.com>, Christoph Lameter <cl@linux.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Geoff Levand <geoff@infradead.org>,
        Gilad Ben Yossef <gilad@benyossef.com>,
        Hakan Akkan <hakanakkan@gmail.com>, Kevin Hilman <khilman@ti.com>,
        Max Krasnyansky <maxk@qualcomm.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Stephen Hemminger <shemminger@vyatta.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Sven-Thorsten Dietrich <thebigcorporation@gmail.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        "Luck,Tony" <tony.luck@intel.com>,
        Venkatesh Pallipadi <venki@google.com>
Date: Thu, 14 Jun 2012 11:10:15 +0200
In-Reply-To: <1339664829.2559.14.camel@twins>
References: <1339604397-8758-1-git-send-email-fweisbec@gmail.com>
	 <1339664829.2559.14.camel@twins>
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On Thu, 2012-06-14 at 11:07 +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..

Note there's also the whole IRQ_TIME_ACCOUNTING muck.. all in all its
getting quite ridiculous.


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