Implement tracef() instrumentation API

[lttng-ust.git] / doc / examples / demo-tracef / README

diff --git a/doc/examples/demo-tracef/README b/doc/examples/demo-tracef/README
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+This is a demo application showing how to trace formatted strings into
+LTTng-UST.
+
+The simplest command to trace the demo program are:
+
+lttng create
+lttng enable-event -u "lttng_ust_tracef:event"
+lttng start
+./demo-tracef
+lttng stop
+lttng view
+lttng destroy
+
+The resulting lttng view output should look like this:
+
+[07:32:02.021045683] (+?.?????????) thinkos lttng_ust:tracef: { cpu_id = 2 }, { _msg_length = 46, msg = "This is a "mystring test" formatted 0 event 42" }
+[07:32:02.021062328] (+0.000016645) thinkos lttng_ust:tracef: { cpu_id = 2 }, { _msg_length = 46, msg = "This is a "mystring test" formatted 1 event 42" }
+[07:32:02.021066300] (+0.000003972) thinkos lttng_ust:tracef: { cpu_id = 2 }, { _msg_length = 46, msg = "This is a "mystring test" formatted 2 event 42" }
+[07:32:02.021069507] (+0.000003207) thinkos lttng_ust:tracef: { cpu_id = 2 }, { _msg_length = 46, msg = "This is a "mystring test" formatted 3 event 42" }
+[07:32:02.021072541] (+0.000003034) thinkos lttng_ust:tracef: { cpu_id = 2 }, { _msg_length = 46, msg = "This is a "mystring test" formatted 4 event 42" }