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    SubjectLTTng 0.44 and LTTV 0.11.3

    Here is why I have been a bit more quiet in the past days. I announce
    the release of LTTng 0.44 based on kernel The highlights :

    - includes trace_clock() patchset, which will also be posted on LKML for
    review shortly (v2 of LTTng timestamping).

    - includes the specialized probes I have been talking about with the
    Google team. This will mainly please Steven who want to write into C
    structures without any marker overhead. Now you have it in LTTng.
    There are restrictions about which types can be written into a
    structure though, as not every types can be exported portably (e.g. no
    bitfields can be used). This is made possible by optionally splitting
    the marker declaration from the marker call to let someone declare a
    marker only to keep track of the associated event types.

    For details, see :;a=commitdiff;h=37f78b629d1eca204aa7edd282599727b7a8a377

    - I created specialized probes for the main events generated by tbench
    and went from 960 -> 1125 MB/s (~2000MB/s without tracing) in flight
    recorder mode. That should please Martin for whom every cycle counts.
    ;) We might want to dissect ltt-type-serializer.o, ltt-relay.o and
    ltt-relay-alloc.o, because almost all the slowdown is located within
    these "core" objects.

    For details, see :;a=commitdiff;h=0ac863964d4d2877eada0383e62d2021cfca6958

    - I have also vastly simplified locking in the markers and tracepoints
    by using _only_ the modules mutex. I actually took this mutex out of
    module.c and created its own file so tracepoints and markers can use
    it. That should please Lai Jiangshan. Although he may have some work
    to do to see how his new probes manager might benefit from it.

    See :;a=commitdiff;h=7aea87ac46df7613d68034f5904bc8d575069076

    So hopefully everyone will be happy with this new release. :)


    Mathieu Desnoyers
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68

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