linux-kernel - Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails

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Date:	Mon, 23 Mar 2015 09:30:13 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Petr Mladek <pmladek@...e.cz>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"David S. Miller" <davem@...emloft.net>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Ananth NMavinakayanahalli <ananth@...ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails

On Mon, 23 Mar 2015 13:39:55 +0100
Petr Mladek <pmladek@...e.cz> wrote:


> > wth is a 'universe' in this context?
> 
> We use the term "universe" to define whether the system or task uses
> original or patched functions. It is especially important for patches
> that modify semantic of functions. They need more complex consistency
> model. It defines when it is safe time for the system or task to start
> using the new functions (switch to the new universe).
> 
> In theory, different tasks might be in more universes if more patches are
> being applied. In practice, we deal with only two universes. The trick is
> that we allow to add new patch only when the whole system has switched
> to the previous one.
> 

Is this terminology documented anywhere upstream yet?

-- Steve
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