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    SubjectRe: [rfc 3/3] perf, x86: P4 PMU -- export ABI part of event config to userspace
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    On Wed, 2010-11-24 at 11:48 +0300, Cyrill Gorcunov wrote:
    > On 11/24/10, Peter Zijlstra <peterz@infradead.org> wrote:
    > > On Wed, 2010-11-24 at 01:46 +0300, Cyrill Gorcunov wrote:
    > >> plain text document attachment (x86-perf-export-abi)
    > >> Due to tight 64 bit size of event config field (where we have to track
    > >> pretty lot of info during event lifetime) some bits are to be exported
    > >> via header into userspace.
    > >>
    > >> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
    > >> CC: Lin Ming <ming.m.lin@intel.com>
    > >> CC: Stephane Eranian <eranian@google.com>
    > >> CC: Peter Zijlstra <peterz@infradead.org>
    > >> ---
    > >>
    > >> Note that I don't like much the idea to export anything into userspace
    > >> but it seems there is no other choise. So there is a minimum which should
    > >> be exported.
    > >
    > >
    > > Could you say what exactly is exposed to userspace and why?
    >
    > yes, we need two enums to be exported, because we use custom encoding,
    > which is described in first patch. peter i'll describe more detailed
    > in a couple of hours, ok?

    Sure, but have you seen my sysfs patches? wouldn't describing the format
    in there suffice?

    http://lkml.org/lkml/2010/11/17/154



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