linux-kernel - Re: [PATCH 0/2 v2] tracing: Enable tracepoints early and allow printk to use them

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Message-ID: <20141214152915.431f7aa8@gandalf.local.home>
Date:	Sun, 14 Dec 2014 15:29:15 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 0/2 v2] tracing: Enable tracepoints early and allow
 printk to use them

On Sun, 14 Dec 2014 15:16:09 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> 1) Allow traceopoints to be enabled right after mm_init(). By passing
> in the trace_event= kernel command line parameter, tracepoints can be
> enabled at boot up. For debugging things like the initialization of
> interrupts, it is needed to have tracepoints enabled very early. People
> have asked about this before and this has been on my todo list. As it
> can be helpful for Thomas to debug his upcoming 3.20 IRQ work, I'm
> pushing this now. This way he can add tracepoints into the IRQ set up
> and have have users enable them when things go wrong.

Cut and paste is a bitch!

s/mm_init/rcu_init/

-- Steve
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