Subject: Re: trace/events: DECLARE vs DEFINE semantic
From: Steven Rostedt <rostedt@goodmis.org>
Reply-To: rostedt@goodmis.org
To: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>,
       mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org,
       randy.dunlap@oracle.com, wcohen@redhat.com, fweisbec@gmail.com,
       tglx@linutronix.de, jbaron@redhat.com,
       linux-tip-commits@vger.kernel.org, Christoph Hellwig <hch@lst.de>
In-Reply-To: <4B17D9D1.7010402@redhat.com>
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Organization: Kihon Technologies Inc.
Date: Thu, 03 Dec 2009 10:56:13 -0500
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On Thu, 2009-12-03 at 10:31 -0500, Masami Hiramatsu wrote:
> Steven Rostedt wrote:

> >> Would you mean putting those headers in sub-system's directory?
> >> (e.g. fs/ext4/)
> >> In that case, a problem will happen when user want to hook those
> >> tracepoint from their module, because it is hard to find those
> >> local headers.
> > 
> > Why? Modules usually do have their own headers in their sub system.
> 
> Module's local headers usually uses only from itself. Other modules
> may not touch it. However, AFAIK, event definitions must be referred
> by event consumer which is another module. IOW, those local headers
> will not be included in kernel-headers/kernel-devel package :-(

I'm a little confused. Who is the event consumer? The trace point user?
The one that hooks into the tracepoint?

-- Steve


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