linux-kernel - Re: [PATCH 1/5] code_domain: New code domain tracking susbsystem

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Message-ID: <20120803203144.GJ2474@linux.vnet.ibm.com>
Date:	Fri, 3 Aug 2012 13:31:44 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	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>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/5] code_domain: New code domain tracking susbsystem

On Fri, Aug 03, 2012 at 04:09:39PM -0400, Steven Rostedt wrote:
> On Fri, 2012-08-03 at 21:45 +0200, Ingo Molnar wrote:
> > * Frederic Weisbecker <fweisbec@...il.com> wrote:
> > 
> > > Create a new subsystem that handles the probing on kernel 
> > > boundaries to keep track of the transitions between code 
> > > domains with two basic initial domains: user or kernel.
> > 
> > To do a bit more bike shed painting, I'd call it "context 
> > tracking" - user mode, kernel mode (guest mode, etc.).
> > 
> > The term 'code domain' would bring up blank stares from most 
> > kernel developers, me thinks.
> 
> Heh, that would be a second new term I heard this week for context.
> Earlier, I noticed that Paul McKenney called it 'levels'. So now there's
> four names:
> 
> user/kernel context
> user/kernel state
> user/kernel level
> user/kernel domain
> 
> And we could probably add a fifth:
> 
> user/kernel mode

Plus:

user/kernel space

> ;-)

Then there is "supervisor", "system", "privileged", and who knows what
all else for "kernel".  And "application" and "problem" and probably
others for "user".

							Thanx, Paul

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