linux-kernel - Re: [PATCH v3] ftrace: add a tracepoint for __raise_softirq

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Date:	Mon, 11 May 2009 10:09:04 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, fweisbec@...il.com,
	zhaolei@...fujitsu.com, laijs@...fujitsu.com,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [PATCH v3] ftrace: add a tracepoint for
 __raise_softirq_irqoff()


On Mon, 11 May 2009, Mathieu Desnoyers wrote:
> 
> Yes, we should try to fix TRACE_EVENT, but we should fix it _before_ we
> start using it widely. Circular header dependencies is a real problem
> with TRACE_EVENT right now.
> 
> Until we fix this, I will be tempted to stay with a known-good solution,
> which is DECLARE/DEFINE_TRACE.

The majority of tracepoints happen is C files. Those few cases where they 
are used in headers is where the issues arise.

But...

I did not want to uglify all trace event headers with:

#ifdef CREATE_FOO_TRACE_POINTS
#undef CREATE_FOO_TRACE_POINTS
#include <trace/define_trace.h>
#endif

We would only need to do that for those trace points that need to be 
included in header files. Then the declaration C file would need to define 
both CREATE_FOO_TRACE_POINTS and CREATE_TRACE_POINTS

#define CREATE_FOO_TRACE_POINTS
#define CRATE_TRACE_POINTS
#include <trace/events/foo.h>


But this is pretty trivial to solve, and I do not consider it a show 
stopper or a major header dependency problem.

-- Steve

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