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    SubjectRe: [PATCH 1/1] perf, Add support for Xeon-Phi PMU
    On Tue, Sep 25, 2012 at 04:22:29PM +0400, Cyrill Gorcunov wrote:
    > On Tue, Sep 25, 2012 at 02:05:58PM +0200, stephane eranian wrote:
    > > On Tue, Sep 25, 2012 at 2:01 PM, Peter Zijlstra <a.p.zijlstra@chello.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?
    >
    > -2 can't be a valid p4 config as far as i can tell.

    I mean such value can be easily recognized by p4 code and treated
    specially if needed.


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