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Date: Wed, 1 Aug 2012 14:45:19 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Alessio Igor Bogani <abogani@kernel.org>,
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        Chris Metcalf <cmetcalf@tilera.com>, Christoph Lameter <cl@linux.com>,
        Geoff Levand <geoff@infradead.org>,
        Gilad Ben Yossef <gilad@benyossef.com>,
        Hakan Akkan <hakanakkan@gmail.com>, "H. Peter Anvin" <hpa@zytor.com>,
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        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Stephen Hemminger <shemminger@vyatta.com>,
        Sven-Thorsten Dietrich <thebigcorporation@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 1/5] user_hooks: New user hooks subsystem
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On Wed, Aug 01, 2012 at 08:43:03AM -0400, Steven Rostedt wrote:
> On Wed, 2012-08-01 at 14:28 +0200, Frederic Weisbecker wrote:
> > On Tue, Jul 31, 2012 at 06:14:22PM +0200, Peter Zijlstra wrote:
> 
> > So we probably need to generalize a bit more. Some naming based on
> > "code domain"?
> > 
> > struct code_domain {
> > 	int is_tracking;
> > 	enum {
> > 		in_kernel,
> > 		in_user,
> > 		in_guest
> > 	} state;
> > }
> 
> Is there a fundamental difference between 'in_user' and 'in_guest'
> though?

Probably not from RCU POV. But the cputime is not accounted the same.