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Subject: Re: perf_counter: hook up the tracepoint events
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jeff Garzik <jeff@garzik.org>
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Date: Wed, 29 Jul 2009 11:12:08 +0200
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On Wed, 2009-07-29 at 04:59 -0400, Jeff Garzik wrote:

> > @@ -957,6 +957,12 @@ config EVENT_PROFILE
> >  	bool "Tracepoint profile sources"
> >  	depends on PERF_COUNTERS && EVENT_TRACING
> >  	default y
> > +	help
> > +	 Allow the use of tracepoints as software performance counters.
> > +
> > +	 When this is enabled, you can create perf counters based on
> > +	 tracepoints using PERF_TYPE_TRACEPOINT and the tracepoint ID
> > +	 found in debugfs://tracing/events/*/*/id.
> 
> Thanks.  Is this feature useful w/out debugfs?

Not really, but I was assuming (/me goes check) that EVENT_TRACING would
mandate debugfs being there.

Hmm kernel/trace/Kconfig seems a little select heavy, but I think it'll
work out and select DEBUG_FS too.

I'll queue up the patch and push it Linus wards this cycle.

Thanks!