Post Syndicated from original https://lwn.net/Articles/927595/

The kernel has a well-developed mechanism for the control of tracing of
events in
kernel space. Developers often want to be able to trace user-space
activity as well, using the same interfaces, but that mode is rather less
well supported. One year ago, an attempt to
add an API for the control of user-space trace events ran into trouble
and has never been fully enabled. Now, Beau Belgrave is back with a
reworked API that may finally result in this mechanism becoming
generally available.