linux-kernel - Re: [PATCH 2/3][RFC] tracing: Add optional percpu buffers for trace

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Date:	Mon, 10 Oct 2011 15:04:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 2/3][RFC] tracing: Add optional percpu buffers for
 trace_printk()

On Mon, 2011-10-10 at 08:37 -0400, Steven Rostedt wrote:

> This will make debugging some of my embedded boards difficult (the ones
> where I have no way to add kernel command lines). If there's a problem
> at boot up, I will have to modify the kernel to get this to print.
> 
> For those that don't know the tracing code, it will just simply break.
> 
> Unless you want me to keep the kconfig option that enables it
> permanently. Then I could do this.

There's a fairly easy fix for that, initialize it at boot, and free once
userspace it up and running if no trace_printk() came by.

> I also expect tglx to throw frozen sharks at me for "why doesn't
> trace_printk() work anymore?!!!!"

I'm sure you'll get over that :-)

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