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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 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?


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