linux-kernel - Re: [PATCH, RFC] sputrace: use the generic event tracer

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Message-Id: <1241621968.11379.23.camel@localhost.localdomain>
Date:	Wed, 06 May 2009 10:59:28 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Hellwig <hch@....de>, Arnd Bergmann <arnd@...db.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, cbe-oss-dev@...abs.org,
	linux-kernel@...r.kernel.org,
	Fr?d?ric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH, RFC] sputrace: use the generic event tracer


On Wed, 2009-05-06 at 16:47 +0200, Ingo Molnar wrote:
> * Steven Rostedt <srostedt@...hat.com> wrote:
> 
> > 
> > On Wed, 2009-05-06 at 13:23 +0200, Ingo Molnar wrote:
> > 
> > > > > > +# magic for the trace events
> > > > > > +CFLAGS_sched.o := -I$(src)
> > > > > 
> > > > > Steve, i'm wondering whether this type of Makefile hackery (caused 
> > > > > by modular tracepoints) could be eliminated ...
> > > > 
> > > > We would just have to include the header file with "" instead of 
> > > > <>. But I remember Steve not liking this when we talked about it.
> > > 
> > > Yeah. But changing Makefiles isnt particularly clean either ...
> > > 
> > > And adding -I$(src) can have side-effects: we often have a local 
> > > foo.h while an include/linux/foo.h as well.
> > 
> > That still would not conflict, because
> > 
> > #include "foo.h"
> > 
> > will not include "linux/foo.h" and
> > 
> > #include <linux/foo.h>
> > 
> > will not include a local foo.h, unless there's also a local "linux"
> > directory with a foo.h in it.
> >
> > The Makefile hack has to do with being able to have the "foo.h" 
> > file with the TRACE_EVENTs someplace other than include/trace.
> > 
> > If the "foo.h" is in include/trace.h we do not need to include 
> > this hack. But because the include/trace/define_trace.h needs to 
> > include the "foo.h" file recursively, it must be able to find it. 
> > If we do not add a search path, include/trace/define_trace.h will 
> > not look in the other locations.
> > 
> > Note, as Christoph did, we only need to add the include path to 
> > the file that defines "CREATE_TRACE_POINTS". Which is only one 
> > file.
> > 
> > CFLAGS_sched.o := -I$(src)
> > 
> > Only touches the sched.c file in that directory (Note, for those 
> > reading this thread out of context, this is not the same file as 
> > kernel/sched.c)
> 
> Yeah, i guess we can live with it. It still feels imperfect though.

Yeah, I dislike it too. But this is a limitation on CPP. When we get
sparse to replace CPP then we can fix it there ;-)

> 
> (btw., find below a small typo fix)
> 
> 	Ingo
> 
> diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
> index f7a7ae1..1d6fa17 100644
> --- a/include/trace/define_trace.h
> +++ b/include/trace/define_trace.h
> @@ -1,5 +1,5 @@
>  /*
> - * Trace files that want to automate creationg of all tracepoints defined
> + * Trace files that want to automate the creation of all tracepoints defined
>   * in their file should include this file. The following are macros that the
>   * trace file may define:
>   *

Thanks,

-- Steve


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