X-Git-Url: https://git.lttng.org/?p=lttngtop.git;a=blobdiff_plain;f=doc%2Flttngtop.1;fp=doc%2Flttngtop.1;h=f83af75dc871055f6672ba83395155b8e57b1bd7;hp=0f4614eb267fa6a9cfe9546db5aa74d0a94a4ef1;hb=bab469fc468832ae02c61e24bf3afaba24228c09;hpb=3bcf0f6b3dc99e6328bc3191cb43f386cca5a44b diff --git a/doc/lttngtop.1 b/doc/lttngtop.1 index 0f4614e..f83af75 100644 --- a/doc/lttngtop.1 +++ b/doc/lttngtop.1 @@ -48,14 +48,35 @@ launched as root. .nf lttng create lttngtop -lttng enable-event -k -a -lttng add-context -k -t pid -t procname -t tid -t ppid -t perf:cache-misses -t perf:major-faults -t perf:branch-load-misses -lttng start +lttng enable-event -k lttng_statedump_start,lttng_statedump_end,lttng_statedump_process_state,lttng_statedump_file_descriptor,lttng_statedump_vm_map,lttng_statedump_network_interface,lttng_statedump_interrupt,sched_process_free,sched_switch -s lttngtop +lttng enable-event -k --syscall -a -s lttngtop +lttng add-context -k -t pid -t procname -t tid -t ppid -t perf:cache-misses -t perf:major-faults -t perf:branch-load-misses -s lttngtop +lttng start lttngtop sleep 10 -lttng stop -lttng destroy +lttng stop lttngtop +lttng destroy lttngtop .fi +.SH "LIVE STREAMING" + +.PP +In addition to offline traces, LTTngTop can read traces while they are being recorded. +The official supported way of doing live streaming is using lttng-tools >=2.4 and +following the documentation in live-reading-howto.txt. +An other experimental way of doing live tracing is with mmap, but this requires some +more work because is not officially supported and requires out-of-tree patches to +lttng-tools and babeltrace. + +.PP +To use the network live-reading, the user only needs to specify the relayd hostname +or IP address with the option -r. For now, LTTngTop will only connect to the first +live session established on the relay, but in a near future, the user will be able +to choose which session to attach to. + +The default mode after attaching to a session is to start reading the trace from +this point in time. In order to read the trace from the beginning, the user can specify +the -b option. + .SH "KEY BINDINGS" .TP 7