X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=doc%2Fquickstart.txt;h=64c6ab7718d1bc8a7e82eb87b95125762bf1710e;hb=dfafb1032f78331195cd93103c131568544425e7;hp=02f926db6a651500ecd097caa1a6e3cd7facb5b7;hpb=495c67f544e6af30e7d581b328d7e865cf337f52;p=lttng-tools.git diff --git a/doc/quickstart.txt b/doc/quickstart.txt index 02f926db6..64c6ab771 100644 --- a/doc/quickstart.txt +++ b/doc/quickstart.txt @@ -36,11 +36,11 @@ The next sections explain how to do tracing :) Kernel Tracing -------------- -You have to modprobe the lttng-modules manually or the session daemon will do -it for you if those modules can be found on your system. - -Again, you can then start the session daemon (ltt-sessiond) by hand or the -lttng command line tool will do it for you. +You can start the session daemon by invoking the command "ltt-sessiond", +or let the lttng command line tool do it for you. The session daemon +loads the LTTng tracer modules for you if those modules can be found on +your system. If they are not found, the kernel tracing feature will be +unavailable. List available kernel events: @@ -55,35 +55,39 @@ If you have multiple sessions, you can change the current session by using # lttng set-session myothersession -2) Enable event(s). Here for example, we want only 'sched_switch' and -'sys_enter' events for the kernel (-k/--kernel). +2) Enable tracepoint event(s). Here for example, we want only +'sched_switch' and 'sched_wakeup' events for the kernel (-k/--kernel). -# lttng enable-event sched_switch,sys_enter -k +# lttng enable-event sched_switch,sched_wakeup -k -or enable ALL events (-a/--all): +or enable ALL tracepoint events (-a/--all): # lttng enable-event -a -k -3) Enable kprobes and/or the function tracer with lttng +3) Enable all system call event(s). + +# lttng enable-event -a -k --syscall + +4) Enable kprobes and/or the function tracer with lttng This is a new feature made possible by the new LTTng 2.0 kernel tracer. You can enable a dynamic probe and data will be output in the trace along side with your tracing data. -# lttng enable-event aname --probe symbol+0xffff7260695 +# lttng enable-event aname -k --probe symbol+0xffff7260695 or -# lttng enable-event aname --probe 0xffff7260695 +# lttng enable-event aname -k --probe 0xffff7260695 Either an
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