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

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Message-ID: <CAMsRxfLUpJu9t1_+N_BLTCdLKNOsbtDfXu8ZmoH1RY5DvonZJg@mail.gmail.com>
Date:	Tue, 25 Sep 2012 14:05:58 +0200
From:	stephane eranian <eranian@...glemail.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Cyrill Gorcunov <gorcunov@...nvz.org>,
	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>,
	"Meadows, Lawrence F" <lawrence.f.meadows@...el.com>
Subject: Re: [PATCH 1/1] perf, Add support for Xeon-Phi PMU

On Tue, Sep 25, 2012 at 2:01 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 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.

Then how about using -1 or -2 for ENOENT and EINVAL?
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