|| ||Mathieu Desnoyers <email@example.com>|
"Martin J. Bligh" <firstname.lastname@example.org>,
Steven Rostedt <email@example.com>,
Ingo Molnar <firstname.lastname@example.org>,
Linus Torvalds <email@example.com>,
Andrew Morton <firstname.lastname@example.org>,
Peter Zijlstra <email@example.com>|
|| ||LTTng 0.44 and LTTV 0.11.3|
|| ||Thu, 23 Oct 2008 20:45:02 -0400|
|| ||firstname.lastname@example.org, email@example.com,
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 22.214.171.124. 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 :
- 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 :
- 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.
So hopefully everyone will be happy with this new release. :)
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