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

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Message-ID: <20150323094317.38dcb601@gandalf.local.home>
Date:	Mon, 23 Mar 2015 09:43:17 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Petr Mladek <pmladek@...e.cz>,
	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,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails

On Mon, 23 Mar 2015 14:34:42 +0100
Ingo Molnar <mingo@...nel.org> wrote:
> 
> Even if it was documented (it isn't), it's pretty weird terminology - 
> please use clearer formulations, like 'patched function' or 'unpatched 
> function' or 'function with pending patch'. No need to redefine 
> existing words in a weird fashion just to create the appearance of 
> being special ...
> 

I think it has to do with their RCU like patching functionality, where
some tasks are still executing the old function and others are
executing the new function. In RCU, there's two "universes" too. One
with the old value, and one with the new. After the grace period has
finished, everything is back to a single "universe".

I'm not sure RCU uses the term "universe" though. Paul?

-- Steve
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