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    SubjectRe: [PATCH 0/2] perf_counter: fix the group mess
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    On Wed, Aug 12, 2009 at 5:35 PM, Peter Zijlstra<a.p.zijlstra@chello.nl> wrote:
    >
    > With these two patches the below proglet gives:
    >
    > # ./test
    > EVNT: 0xffffffff811c0f4c scale: nan ID: 37 CNT: 1006180 ID: 38 CNT: 1010230 ID: 39 CNT: 1010332 ID: 40 CNT: 1010420
    >
    > I can't seem to catch the SIGIO thing, but at least all the counters report

    I think it's because you are missing this fcntl() call to get async
    notification:

    ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_ASYNC);
    if (ret == -1)
    err(1, "cannot set ASYNC");


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