linux-kernel - Re: [PATCH 1/2] tracing/ftrace: don't trace on early stage of secondary cpu boot

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Date:	Tue, 23 Dec 2008 22:11:54 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frédéric Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] tracing/ftrace: don't trace on early stage of
 secondary cpu boot


On Wed, 24 Dec 2008, Fr?d?ric Weisbecker wrote:
> 
> One other solution, would be to define raw_smp_processor_id() to
> stack_smp_processor_id() and current to
> cpu_pda(stack_smp_processor_id()) if function_tracer is configured.
> That would even let one to trace those cpu boot
> functions.
> 
> But the other side effect with this is that perhaps "current" would be
> retrieved with one pointer more to dereference....

Nah, I think that is a bit too intrusive. We really do not want to call 
the function tracer if it can not handle a simple smp_processor_id() call. 
You never know what else might turn up in this area.

-- Steve

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