linux-kernel - Re: [PATCH 1/1] tracing: Simplify trace_array

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Message-ID: <1374255593.3356.16.camel@gandalf.local.home>
Date:	Fri, 19 Jul 2013 13:39:53 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] tracing: Simplify trace_array_get()

On Fri, 2013-07-19 at 13:35 -0400, Steven Rostedt wrote:

> What would happen in that case, is that an event might be enabled or
> disabled in another buffer instance. As that can only happen by the root
> user, it would be the root user doing multiple things at the same time
> to cause it. They might get a strange result at worse, but that would
> also mean they were trying to add and delete instances while reading
> those same instances. Bad root, bad!

In fact, I even mentioned this race in the commit log.

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/kernel/trace/trace.c?id=ff451961a8b2a17667a7bfa39c86fb9b351445db

-- Steve


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