linux-kernel - Re: [PATCH 1/1] perf, Add support for Xeon-Phi PMU

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Date:	Tue, 25 Sep 2012 14:01:26 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	eranian@...il.com,
	"Meadows, Lawrence F" <lawrence.f.meadows@...el.com>
Subject: Re: [PATCH 1/1] perf, Add support for Xeon-Phi PMU

On Tue, 2012-09-25 at 15:42 +0400, Cyrill Gorcunov wrote:

> Guys, letme re-read this whole mail thread first since I have no clue
> what this remapping about ;)

x86_setup_perfctr() / set_ext_hw_attr() have special purposed 0 and -1
config values to mean -ENOENT and -EINVAL resp.

This means neither config value can be a 'real' event. Now it turns out
Xeon-Phi has an actual event 0, which is masked by these special case
thingies.
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