[lttng-docs.git] / contents / whats-new.md

---
id: whats-new
---

Most of the changes of LTTng 2.6 are bug fixes, making the toolchain
more stable than ever before. Still, LTTng 2.6 adds some interesting
features to the project.

LTTng 2.5 already supported the instrumentation and tracing of
[Java applications](#doc-java-application) through `java.util.logging`
(JUL). LTTng 2.6 goes one step further by supporting
<a href="https://logging.apache.org/log4j/1.2/" class="ext">Apache log4j 1.2</a>.
The new log4j domain is selected using the `--log4j` option in various
commands of the `lttng` tool.

LTTng-modules has supported system call tracing for a long time,
but until now, it was only possible to record either all of them,
or none of them. LTTng 2.6 allows the user to record specific
system call events, for example:

<pre class="term">
lttng enable-event --kernel --syscall open,fork,chdir,pipe
</pre>

Finally, the `lttng` command line tool is not only able to communicate
with humans as it used to do, but also with machines thanks to its new
[machine interface](#doc-mi) feature.

To learn more about the new features of LTTng 2.6, see
[the release announcement](//lttng.org/blog/2015/02/27/lttng-2.6-released/).
Commit	Line	Data
727aa690 PP	1	---
	2	id: whats-new
	3	---
	4
	5	Most of the changes of LTTng 2.6 are bug fixes, making the toolchain
	6	more stable than ever before. Still, LTTng 2.6 adds some interesting
13d77599	7	features to the project.
727aa690 PP	8
	9	LTTng 2.5 already supported the instrumentation and tracing of
	10	[Java applications](#doc-java-application) through `java.util.logging`
	11	(JUL). LTTng 2.6 goes one step further by supporting
	12	<a href="https://logging.apache.org/log4j/1.2/" class="ext">Apache log4j 1.2</a>.
	13	The new log4j domain is selected using the `--log4j` option in various
	14	commands of the `lttng` tool.
	15
	16	LTTng-modules has supported system call tracing for a long time,
	17	but until now, it was only possible to record either all of them,
13d77599	18	or none of them. LTTng 2.6 allows the user to record specific
4d46e8c0	19	system call events, for example:
727aa690 PP	20
	21	<pre class="term">
	22	lttng enable-event --kernel --syscall open,fork,chdir,pipe
	23	</pre>
	24
13d77599 PP	25	Finally, the `lttng` command line tool is not only able to communicate
13d77599 PP	26	with humans as it used to do, but also with machines thanks to its new
727aa690	27	[machine interface](#doc-mi) feature.
26418fc3 PP	28
26418fc3 PP	29	To learn more about the new features of LTTng 2.6, see
13d77599	30	[the release announcement](//lttng.org/blog/2015/02/27/lttng-2.6-released/).