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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@kernel.org>, Petr Mladek <pmladek@suse.cz>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	"David S. Miller" <davem@davemloft.net>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	Ananth NMavinakayanahalli <ananth@in.ibm.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@redhat.com>, Jiri Kosina <jkosina@suse.cz>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails
Date: Mon, 23 Mar 2015 09:43:13 -0700	[thread overview]
Message-ID: <20150323164313.GG5718@linux.vnet.ibm.com> (raw)
In-Reply-To: <20150323094317.38dcb601@gandalf.local.home>

On Mon, Mar 23, 2015 at 09:43:17AM -0400, Steven Rostedt wrote:
> On Mon, 23 Mar 2015 14:34:42 +0100
> Ingo Molnar <mingo@kernel.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?

I have used "version" for what you call "universe", but mostly in
"intro to RCU" guest lectures.

							Thanx, Paul


  parent reply	other threads:[~2015-03-23 16:43 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-20 14:02 [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails Petr Mladek
2015-03-23  8:54 ` Ingo Molnar
2015-03-23 10:12   ` Petr Mladek
2015-03-23 10:33     ` Ingo Molnar
2015-03-23 12:39       ` Petr Mladek
2015-03-23 13:30         ` Steven Rostedt
2015-03-23 13:34           ` Ingo Molnar
2015-03-23 13:43             ` Steven Rostedt
2015-03-23 13:53               ` Ingo Molnar
2015-03-23 13:58                 ` Steven Rostedt
2015-03-23 16:38                   ` Petr Mladek
2015-03-23 16:43               ` Paul E. McKenney [this message]
2015-03-23 23:32                 ` Jiri Kosina
2015-03-23 22:36             ` Jiri Kosina
2015-03-24  7:59               ` Petr Mladek
2015-03-24 13:36                 ` Steven Rostedt

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