[[welcome]]
== Welcome!

Welcome to the **LTTng Documentation**!

The _Linux Trace Toolkit: next generation_ is an open source software
toolkit used to simultaneously trace the Linux kernel, user applications,
and user libraries. LTTng consists of <<lttng-modules,kernel modules>>
(for Linux kernel tracing) and dynamically loaded
<<lttng-ust,libraries>> (for user application and library tracing).
A <<lttng-sessiond,session daemon>> controls the LTTng tracers after it
receives commands from the <<lttng-cli,cmd:lttng command-line
tool>>.

[NOTE]
.Open source documentation
====
This is an **open documentation**: its source is available in a
https://github.com/lttng/lttng-docs[public Git repository].

Should you find any error in the content of this text, any grammatical
mistake, or any dead link, we would be very grateful if you would file a
GitHub issue for it or, even better, contribute a patch to this
documentation by creating a pull request.
====