[lttng-dev] [RELEASE] LTTng-UST 2.5.0
mathieu.desnoyers at efficios.com
Wed Jul 16 18:28:31 EDT 2014
LTTng-UST, the Linux Trace Toolkit Next Generation Userspace Tracer, is
port of the low-overhead tracing capabilities of the LTTng kernel tracer
to user-space. The library "liblttng-ust" enables tracing of
applications and libraries.
Noteworthy new features in LTTng-UST 2.5.0:
New and noteworthy:
- New tracef() instrumentation facility. Excerpt from lttng-ust(3) man page:
USAGE WITH TRACEF
The simplest way to add instrumentation to your code is by far the
tracef() API. To do it, in a nutshell:
1) #include <lttng/tracef.h>
2) /* in your code, use like a printf */
tracef("my message, this integer %d", 1234);
3) Link your program against liblttng-ust.so.
4) Enable UST events when tracing with the following sequence of commands
lttng enable-event -u -a
[... run your program ...]
If you want to have more flexibility and control on the event names,
payload typing, etc, you can continue reading on and use the trace‐
points below. "tracef()" is there for quick and dirty ad hoc instrumen‐
tation, whereas tracepoint.h is meant for thorough instrumentation of a
code base to be integrated with an upstream project.
- Perf PMU counters support from user-space on x86.
- Library base address dump is now stable (thanks to Mentor for their
2014-07-16 (Take Your Poet to Work Day) lttng-ust 2.5.0
* Mutex while updating statedump_pending is not needed
* Revert "Turn base address dump into experimental feature"
* Fix: document ust_fork_mutex nesting
* Bugfix for #745 deadlock with baddr statedump+fork
* Move enablers syncing after the channel registration
* Add lttng_ust_notrace to static inline functions
* lttng ust: support ppc64le within configure
Project website: http://lttng.org
Download link: http://lttng.org/download
(please refer to the README file for installation instructions)
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