linux-kernel - Re: [RFC PATCH 2/3] perf: Add persistent event facilities

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Date:	Sat, 6 Apr 2013 18:29:07 +0200
From:	Robert Richter <rric@...nel.org>
To:	Borislav Petkov <bp@...en8.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [RFC PATCH 2/3] perf: Add persistent event facilities

On 03.04.13 19:27:12, Borislav Petkov wrote:
> > > +	list_for_each_entry(desc, &per_cpu(pers_events, cpu), plist) {
> > > +
> > > +		if (desc->attr->config != attr->config)
> > > +			continue;
> > 
> > Umm, the attr->config is not sufficient as a selector since it must be
> > unique which is not granted (of course it works for one event only).
> 
> Right, so the tracepoints are enumerated by tracing code at boot
> time. But not the hw events, for example. How can we select events
> unambiguously?

As we discussed personally, in a first version we should allow only
the tracepoint pmu to be used for persistent events. The config value
is then unique and the above works.

-Robert
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