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    SubjectRe: [PATCH 2/2] perf: Userspace software event and ioctl
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    On Mon, 2014-09-29 at 16:32 +0100, Peter Zijlstra wrote:
    > Also none of the many words above describe
    > PERF_SAMPLE_USERSPACE_EVENT(), wth is that about?

    Hopefully description of the v2 makes better job in this:

    http://thread.gmane.org/gmane.linux.kernel/1793272/focus=4813

    where it's already called "UEVENT" and was generated by write().

    Before you get into this, though, the most important outcomes of both v1
    and v2 discussions:

    * Ingo suggested prctl(PR_TRACE_UEVENT, type, size, data, 0) as the way
    of generating such events (so the tracee doesn't have to know the fd to
    do ioctl); Frederic seems to have the same on his mind.

    * Namhyung proposed sticking the userspace-originating events into the
    buffer as PERF_RECORD_UEVENT rather then PERF_SAMPLE_UEVENT.

    Working on making both happen now.

    Pawel



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