UST Userspace Tracer
The userspace tracer is designed to provide detailed information about userspace activity. UST is a port of the LTTng kernel tracer to userspace. Like the LTTng kernel tracer, performance is the main goal. Tracing does not require system calls or traps. UST instrumentation points may be added in any userspace code including signal handlers and libraries.
Manual
Source
Packages
Packages are available for Debian and Ubuntu
Repository
Repository web interface: gitweb
Git url: git://git.lttng.org/ust.git
Roadmap
See the UST Roadmap page.
Mailing list
For help and developer discussions, see the LTTng mailing list.