.nf
Enable tracing channel
-To enable event, you must first enable a channel which contains event(s).
+To enable an event, you must enable both the event and the channel that
+contains it.
If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc
file.
Flight recorder mode : overwrites events when subbuffers are full
\-\-subbuf-size SIZE
Subbuffer size in bytes (default: 4096, kernel default: 262144)
+ Needs to be a power of 2 for both tracers
\-\-num-subbuf NUM
Number of subbuffers (default: 4)
- Needs to be a power of 2 for kernel and ust tracers
+ Needs to be a power of 2 for both tracers
\-\-switch-timer USEC
- Switch subbuffer timer interval in usec (default: 0)
- Needs to be a power of 2 for kernel and ust tracers
+ Switch subbuffer timer interval in µsec (default: 0)
\-\-read-timer USEC
- Read timer interval in usec (default: 200)
+ Read timer interval in µsec (default: 200)
\-\-output TYPE
Channel output type. Possible values: mmap, splice
\-\-buffers-uid