linux-kernel - Re: perf_counter: hook up the tracepoint events

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Message-Id: <1248858728.6987.3055.camel@twins>
Date:	Wed, 29 Jul 2009 11:12:08 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	mingo@...hat.com, hpa@...or.com, tglx@...utronix.de, mingo@...e.hu,
	paulus@...ba.org, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org,
	linux-tip-commits <linux-tip-commits@...r.kernel.org>
Subject: Re: perf_counter: hook up the tracepoint events

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!

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