[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
	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
	7	features to the project.
	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,
	18	or none of them. LTTng 2.6 allows the user to record specific
	19	system call events, for example:
	20
	21	<pre class="term">
	22	lttng enable-event --kernel --syscall open,fork,chdir,pipe
	23	</pre>
	24
	25	Finally, the `lttng` command line tool is not only able to communicate
	26	with humans as it used to do, but also with machines thanks to its new
	27	[machine interface](#doc-mi) feature.
	28
	29	To learn more about the new features of LTTng 2.6, see
	30	[the release announcement](//lttng.org/blog/2015/02/27/lttng-2.6-released/).