linux-kernel - Re: [PATCH 1/5] user_hooks: New user hooks subsystem

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Date:	Wed, 1 Aug 2012 14:45:19 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.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>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/5] user_hooks: New user hooks subsystem

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.
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