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Update documentation for LTTng ust tracing

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Signed-off-by: Mohamad Gebai <mohamad.gebai@polymtl.ca>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Mohamad Gebai 2014-01-29 22:47:57 -05:00 committed by Stefan Hajnoczi
parent e6bf23f82d
commit ef3ef4a040
1 changed files with 36 additions and 0 deletions
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36
docs/tracing.txt
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@ -214,6 +214,42 @@ The "ust" backend uses the LTTng Userspace Tracer library. There are no
monitor commands built into QEMU, instead UST utilities should be used to list,
enable/disable, and dump traces.
Package lttng-tools is required for userspace tracing. You must ensure that the
current user belongs to the "tracing" group, or manually launch the
lttng-sessiond daemon for the current user prior to running any instance of
QEMU.
While running an instrumented QEMU, LTTng should be able to list all available
events:
lttng list -u
Create tracing session:
lttng create mysession
Enable events:
lttng enable-event qemu:g_malloc -u
Where the events can either be a comma-separated list of events, or "-a" to
enable all tracepoint events. Start and stop tracing as needed:
lttng start
lttng stop
View the trace:
lttng view
Destroy tracing session:
lttng destroy
Babeltrace can be used at any later time to view the trace:
babeltrace $HOME/lttng-traces/mysession-<date>-<time>
=== SystemTap ===
The "dtrace" backend uses DTrace sdt probes but has only been tested with