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LTTng 0.44 and LTTV 0.11.3

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From: Mathieu Desnoyers
Subject: LTTng 0.44 and LTTV 0.11.3
Date: Thursday, October 23, 2008 - 5:45 pm

Hi,

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 2.6.27.2. 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 :
  http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=commitdiff;h=3...

- 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 :
  http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=commitdiff;h=0...

- 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 :
  http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=commitdiff;h=7...
  and
  http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=commitdiff;h=5...
  http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=commitdiff;h=4...

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

Mathieu

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Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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Messages in current thread:
LTTng 0.44 and LTTV 0.11.3, Mathieu Desnoyers, (Thu Oct 23, 5:45 pm)
Re: [ltt-dev] LTTng 0.44 and LTTV 0.11.3, Lai Jiangshan, (Mon Oct 27, 8:55 pm)
Re: [ltt-dev] LTTng 0.44 and LTTV 0.11.3, Mathieu Desnoyers, (Wed Oct 29, 10:40 am)
Re: [sadump 04308] Re: [ltt-dev] LTTng 0.44 and LTTV 0.11.3, Lai Jiangshan, (Wed Oct 29, 8:32 pm)
Re: [ltt-dev] [sadump 04308] Re: LTTng 0.44 and LTTV 0.11.3, Mathieu Desnoyers, (Wed Oct 29, 11:01 pm)