linux-kernel - Re: Problem with CREATE_TRACE

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Date:	Wed, 15 Apr 2009 22:02:49 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Problem with CREATE_TRACE_POINTS and recursion safety


On Wed, 15 Apr 2009, Jeremy Fitzhardinge wrote:

> Steven Rostedt wrote:
> > On Wed, 15 Apr 2009, Jeremy Fitzhardinge wrote:
> > 
> >   
> > > I'm having a problem with CREATE_TRACE_POINTS being too indiscriminate.
> > > The
> > > trouble is that it not only creates tracepoint definitions for the
> > > intended
> > > tracepoints, but any other tracepoint definitions which get included
> > > incidentally.
> > > 
> > > For example, I'm seeing my paravirt tracepoints being instantiated in both
> > > kernel/sched.o and kernel/irq/manage.o as side-effects of the scheduler
> > > and
> > > irq tracepoints being instantiated.
> > > 
> > > I'm experimenting with a different scheme, wherein a subsystem defines
> > > CREATE_FOO_TRACE_POINTS in the .c file where it wants to instantiate the
> > > tracepoints - rather than CREATE_TRACE_POINTS - and its trace/events/foo.h
> > > does:
> > > 
> > >    #ifdef CREATE_FOO_TRACE_POINTS
> > >    #undef CREATE_FOO_TRACE_POINTS	/* avoid infinite recursion */
> > >    #include <trace/instantiate_trace.h>
> > >    #else
> > >    #include <trace/define_trace.h>
> > >    #endif
> > > 
> > > where instantiate_trace.h is:
> > > 
> > >    #define CREATE_TRACE_POINTS
> > >    #include <trace/define_trace.h>
> > >    #undef CREATE_TRACE_POINTS

Have you tried:

#ifdef CREATE_PVOPS_TRACE_POINTS
#define CREATE_TRACE_POINTS
#include <trace/define_trace.h>
#undef CREATE_TRACE_POINTS
#endif

And in your C file do:

#define CREATE_PVOPS_TRACE_POINTS
#include <trace/pvops.h>

??

-- Steve
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