Using LTTng
LTTng is a set of dual licensed GPLv2 and LGPL tracing and profiling tools for both applications and kernels. It produces binary trace files in the production optimized Compact Trace Format (CTF), which can then be analyzed by tools such as babeltrace.
Getting ready
To include the different LTTng tools in your system, add the following to your conf/local.conf file:
IMAGE_INSTALL_append = " lttng-tools lttng-modules lttng-ust"
They are also part of the tools-profile image feature, so you can also add them with the following:
EXTRA_IMAGE_FEATURES += "tools-profile"
These are also included in the -sdk images.
The default Wandboard Linux kernel is already configured to use LTTng, but other platforms might need to enable CONFIG_TRACEPOINTS.
The LTTng command-line tool is the main user interface to LTTng. It can be used to trace both the Linux kernel-using the kernel tracing interfaces we have seen in previous recipes—as well as instrumented user space applications.
How to do it...
A kernel...
