projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| 53f7d0d7 MJ |
1 | <!-- |
| 2 | SPDX-FileCopyrightText: 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 3 | ||
| 4 | SPDX-License-Identifier: CC-BY-4.0 | |
| 5 | --> | |
| 6 | ||
| 641c659a MD |
7 | This is a demo application showing how to trace formatted strings into |
| 8 | LTTng-UST. | |
| 9 | ||
| 10 | The simplest command to trace the demo program are: | |
| 11 | ||
| 53f7d0d7 | 12 | ``` |
| 641c659a MD |
13 | lttng create |
| 14 | lttng enable-event -u "lttng_ust_tracef:event" | |
| 15 | lttng start | |
| 16 | ./demo-tracef | |
| 17 | lttng stop | |
| 18 | lttng view | |
| 19 | lttng destroy | |
| 53f7d0d7 | 20 | ``` |
| 641c659a MD |
21 | |
| 22 | The resulting lttng view output should look like this: | |
| 23 | ||
| 53f7d0d7 | 24 | ``` |
| 641c659a MD |
25 | [07:32:02.021045683] (+?.?????????) thinkos lttng_ust:tracef: { cpu_id = 2 }, { _msg_length = 46, msg = "This is a "mystring test" formatted 0 event 42" } |
| 26 | [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" } | |
| 27 | [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" } | |
| 28 | [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" } | |
| 29 | [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" } | |
| 53f7d0d7 | 30 | ``` |