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391b9c72 | 1 | .TH "LTTNG" "1" "December 3rd, 2012" "" "" |
6991b181 DG |
2 | |
3 | .SH "NAME" | |
391b9c72 | 4 | lttng \(em LTTng 2.1.x tracer control command line tool |
6991b181 DG |
5 | |
6 | .SH "SYNOPSIS" | |
7 | ||
8 | .PP | |
9 | .nf | |
10 | lttng [OPTIONS] <COMMAND> | |
11 | .fi | |
12 | .SH "DESCRIPTION" | |
13 | ||
14 | .PP | |
15 | The LTTng project aims at providing highly efficient tracing tools for Linux. | |
16 | It's tracers help tracking down performance issues and debugging problems | |
17 | involving multiple concurrent processes and threads. Tracing across multiple | |
18 | systems is also possible. | |
19 | ||
fa072eae | 20 | The \fBlttng\fP command line tool from the lttng-tools package is used to control |
6991b181 DG |
21 | both kernel and user-space tracing. Every interactions with the tracer should |
22 | be done by this tool or by the liblttng-ctl provided with the lttng-tools | |
23 | package. | |
24 | ||
25 | LTTng uses a session daemon (lttng-sessiond(8)), acting as a tracing registry, | |
50a3b92a | 26 | which allows you to interact with multiple tracers (kernel and user-space) |
6991b181 DG |
27 | inside the same container, a tracing session. Traces can be gathered from the |
28 | kernel and/or instrumented applications (lttng-ust(3)). Aggregating and reading | |
29 | those traces is done using the babeltrace(1) text viewer. | |
30 | ||
50a3b92a DG |
31 | We introduce the notion of \fBtracing domains\fP which is essentially a type of |
32 | tracer (kernel or user space for now). In the future, we could see a third | |
33 | tracer being for instance an hypervisor. For some commands, you'll need to | |
34 | specify on which domain the command applies (-u or -k). For instance, enabling | |
35 | a kernel event, you must specify the kernel domain to the command so we know | |
36 | for which tracer this event is for. | |
37 | ||
6991b181 DG |
38 | In order to trace the kernel, the session daemon needs to be running as root. |
39 | LTTng provides the use of a \fBtracing group\fP (default: tracing). Whomever is | |
40 | in that group can interact with the root session daemon and thus trace the | |
41 | kernel. Session daemons can co-exist meaning that you can have a session daemon | |
fa072eae YB |
42 | running as Alice that can be used to trace her applications along side with a |
43 | root daemon or even a Bob daemon. We highly recommend to start the session | |
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44 | daemon at boot time for stable and long term tracing. |
45 | ||
46 | Every user-space applications instrumented with lttng-ust(3), will | |
47 | automatically register to the session daemon. This feature gives you the | |
48 | ability to list available traceable applications and tracepoints on a per user | |
49 | basis. (See \fBlist\fP command). | |
50 | .SH "OPTIONS" | |
51 | ||
52 | .PP | |
53 | This program follow the usual GNU command line syntax with long options starting with | |
54 | two dashes. Below is a summary of the available options. | |
55 | .PP | |
56 | ||
57 | .TP | |
c9e32613 | 58 | .BR "\-h, \-\-help" |
6991b181 DG |
59 | Show summary of possible options and commands. |
60 | .TP | |
c9e32613 | 61 | .BR "\-v, \-\-verbose" |
6991b181 | 62 | Increase verbosity. |
d829b38c | 63 | Three levels of verbosity are available which are triggered by putting additional v to |
fa072eae | 64 | the option (\-vv or \-vvv) |
6991b181 | 65 | .TP |
c9e32613 | 66 | .BR "\-q, \-\-quiet" |
6991b181 DG |
67 | Suppress all messages (even errors). |
68 | .TP | |
c9e32613 | 69 | .BR "\-g, \-\-group NAME" |
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70 | Set unix tracing group name. (default: tracing) |
71 | .TP | |
c9e32613 | 72 | .BR "\-n, \-\-no-sessiond" |
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73 | Don't automatically spawn a session daemon. |
74 | .TP | |
391b9c72 | 75 | .BR "\-\-sessiond\-path PATH" |
6991b181 DG |
76 | Set session daemon full binary path. |
77 | .TP | |
c9e32613 | 78 | .BR "\-\-list\-options" |
6991b181 DG |
79 | Simple listing of lttng options. |
80 | .TP | |
c9e32613 | 81 | .BR "\-\-list\-commands" |
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82 | Simple listing of lttng commands. |
83 | .SH "COMMANDS" | |
84 | ||
85 | .TP | |
86 | \fBadd-context\fP | |
87 | .nf | |
88 | Add context to event(s) and/or channel(s). | |
89 | ||
391b9c72 DG |
90 | A context is basically extra information appended to a channel. For instance, |
91 | you could ask the tracer to add the PID information for all events in a | |
92 | channel. You can also add performance monitoring unit counters (perf PMU) using | |
93 | the perf kernel API). | |
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94 | |
95 | For example, this command will add the context information 'prio' and two perf | |
96 | counters (hardware branch misses and cache misses), to all events in the trace | |
97 | data output: | |
98 | ||
c9e32613 | 99 | # lttng add-context \-k \-t prio \-t perf:branch-misses \-t perf:cache-misses |
6991b181 | 100 | |
c9e32613 | 101 | Please take a look at the help (\-h/\-\-help) for a detailed list of available |
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102 | contexts. |
103 | ||
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104 | If no channel is given (\-c), the context is added to all channels. Otherwise |
105 | the context will be added only to the given channel (\-c). | |
6991b181 | 106 | |
c9e32613 | 107 | If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc |
6991b181 DG |
108 | file. |
109 | .fi | |
110 | ||
111 | .B OPTIONS: | |
112 | ||
113 | .nf | |
c9e32613 | 114 | \-h, \-\-help |
6991b181 | 115 | Show summary of possible options and commands. |
c9e32613 | 116 | \-s, \-\-session NAME |
6991b181 | 117 | Apply on session name. |
c9e32613 | 118 | \-c, \-\-channel NAME |
6991b181 | 119 | Apply on channel name. |
c9e32613 | 120 | \-k, \-\-kernel |
6991b181 | 121 | Apply for the kernel tracer |
c9e32613 | 122 | \-u, \-\-userspace |
6991b181 | 123 | Apply for the user-space tracer |
c9e32613 | 124 | \-t, \-\-type TYPE |
6991b181 | 125 | Context type. You can repeat this option on the command line. Please |
c9e32613 | 126 | use "lttng add-context \-h" to list all available types. |
6991b181 DG |
127 | .fi |
128 | ||
129 | .IP | |
130 | ||
131 | .IP "\fBcalibrate\fP" | |
132 | .nf | |
133 | Quantify LTTng overhead | |
134 | ||
135 | The LTTng calibrate command can be used to find out the combined average | |
136 | overhead of the LTTng tracer and the instrumentation mechanisms used. This | |
137 | overhead can be calibrated in terms of time or using any of the PMU performance | |
138 | counter available on the system. | |
139 | ||
140 | For now, the only calibration implemented is that of the kernel function | |
141 | instrumentation (kretprobes). | |
142 | ||
143 | * Calibrate kernel function instrumentation | |
144 | ||
145 | Let's use an example to show this calibration. We use an i7 processor with 4 | |
146 | general-purpose PMU registers. This information is available by issuing dmesg, | |
147 | looking for "generic registers". | |
148 | ||
149 | This sequence of commands will gather a trace executing a kretprobe hooked on | |
150 | an empty function, gathering PMU counters LLC (Last Level Cache) misses | |
c9e32613 | 151 | information (see lttng add-context \-\-help to see the list of available PMU |
6991b181 DG |
152 | counters). |
153 | ||
154 | # lttng create calibrate-function | |
c9e32613 DG |
155 | # lttng enable-event calibrate \-\-kernel \-\-function lttng_calibrate_kretprobe |
156 | # lttng add-context \-\-kernel \-t perf:LLC-load-misses \-t perf:LLC-store-misses \\ | |
157 | \-t perf:LLC-prefetch-misses | |
6991b181 DG |
158 | # lttng start |
159 | # for a in $(seq 1 10); do \\ | |
c9e32613 | 160 | lttng calibrate \-\-kernel \-\-function; |
6991b181 DG |
161 | done |
162 | # lttng destroy | |
c9e32613 | 163 | # babeltrace $(ls \-1drt ~/lttng-traces/calibrate-function-* | tail \-n 1) |
6991b181 DG |
164 | |
165 | The output from babeltrace can be saved to a text file and opened in a | |
166 | spreadsheet (e.g. oocalc) to focus on the per-PMU counter delta between | |
167 | consecutive "calibrate_entry" and "calibrate_return" events. Note that these | |
168 | counters are per-CPU, so scheduling events would need to be present to account | |
169 | for migration between CPU. Therefore, for calibration purposes, only events | |
170 | staying on the same CPU must be considered. | |
171 | ||
172 | The average result, for the i7, on 10 samples: | |
173 | ||
174 | Average Std.Dev. | |
175 | perf_LLC_load_misses: 5.0 0.577 | |
176 | perf_LLC_store_misses: 1.6 0.516 | |
177 | perf_LLC_prefetch_misses: 9.0 14.742 | |
178 | ||
179 | As we can notice, the load and store misses are relatively stable across runs | |
180 | (their standard deviation is relatively low) compared to the prefetch misses. | |
181 | We can conclude from this information that LLC load and store misses can be | |
182 | accounted for quite precisely, but prefetches within a function seems to behave | |
183 | too erratically (not much causality link between the code executed and the CPU | |
184 | prefetch activity) to be accounted for. | |
185 | .fi | |
186 | ||
187 | .B OPTIONS: | |
188 | ||
189 | .nf | |
c9e32613 | 190 | \-h, \-\-help |
6991b181 | 191 | Show summary of possible options and commands. |
c9e32613 | 192 | \-k, \-\-kernel |
6991b181 | 193 | Apply for the kernel tracer |
c9e32613 | 194 | \-u, \-\-userspace |
6991b181 | 195 | Apply for the user-space tracer |
c9e32613 | 196 | \-\-function |
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197 | Dynamic function entry/return probe (default) |
198 | .fi | |
199 | ||
200 | .IP | |
201 | ||
6b8f2e64 | 202 | .IP "\fBcreate\fP [NAME] [OPTIONS] |
6991b181 DG |
203 | .nf |
204 | Create tracing session. | |
205 | ||
206 | A tracing session contains channel(s) which contains event(s). It is domain | |
207 | agnostic meaning that you can enable channels and events for either the | |
208 | user-space tracer and/or the kernel tracer. It acts like a container | |
209 | aggregating multiple tracing sources. | |
210 | ||
211 | On creation, a \fB.lttngrc\fP file is created in your $HOME directory | |
212 | containing the current session name. If NAME is omitted, a session name is | |
fa072eae | 213 | automatically created having this form: 'auto-yyyymmdd-hhmmss'. |
6991b181 | 214 | |
c9e32613 | 215 | If no \fB\-o, \-\-output\fP is specified, the traces will be written in |
6991b181 DG |
216 | $HOME/lttng-traces. |
217 | .fi | |
218 | ||
219 | .B OPTIONS: | |
220 | ||
221 | .nf | |
c9e32613 | 222 | \-h, \-\-help |
6991b181 | 223 | Show summary of possible options and commands. |
c9e32613 | 224 | \-\-list-options |
6991b181 | 225 | Simple listing of options |
c9e32613 | 226 | \-o, \-\-output PATH |
6991b181 | 227 | Specify output path for traces |
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228 | |
229 | Using these options, each API call can be controlled individually. For | |
230 | instance, \-C does not enable the consumer automatically. You'll need the \-e | |
231 | option for that. | |
232 | ||
23d14dff | 233 | \-U, \-\-set-url=URL |
785d2d0d | 234 | Set URL for the consumer output destination. It is persistent for the |
6b8f2e64 DG |
235 | session lifetime. Redo the command to change it. This will set both |
236 | data and control URL for network. | |
237 | \-C, \-\-ctrl-url=URL | |
238 | Set control path URL. (Must use -D also) | |
239 | \-D, \-\-data-url=URL | |
240 | Set data path URL. (Must use -C also) | |
6b8f2e64 | 241 | |
785d2d0d DG |
242 | .B URL FORMAT: |
243 | ||
244 | proto://[HOST|IP][:PORT1[:PORT2]][/TRACE_PATH] | |
245 | ||
246 | Supported protocols are (proto): | |
247 | > file://... | |
248 | Local filesystem full path. | |
249 | ||
250 | > net://... | |
251 | This will use the default network transport layer which is TCP for both | |
252 | control (PORT1) and data port (PORT2). The default ports are | |
253 | respectively 5342 and 5343. Note that net[6]:// is not yet supported. | |
254 | ||
255 | > tcp[6]://... | |
256 | Can only be used with -C and -D together | |
257 | ||
258 | NOTE: IPv6 address MUST be enclosed in brackets '[]' (rfc2732) | |
6b8f2e64 DG |
259 | |
260 | .B EXAMPLES: | |
261 | ||
262 | # lttng create -U net://192.168.1.42 | |
263 | Uses TCP and default ports for the given destination. | |
264 | ||
265 | # lttng create -U net6://[fe80::f66d:4ff:fe53:d220] | |
266 | Uses TCP, default ports and IPv6. | |
267 | ||
268 | # lttng create s1 -U net://myhost.com:3229 | |
269 | Create session s1 and set its consumer to myhost.com on port 3229 for control. | |
6991b181 DG |
270 | .fi |
271 | ||
272 | .IP | |
273 | ||
274 | .IP "\fBdestroy\fP [OPTIONS] [NAME]" | |
275 | .nf | |
276 | Teardown tracing session | |
277 | ||
278 | Free memory on the session daemon and tracer side. It's gone! | |
279 | ||
280 | If NAME is omitted, the session name is taken from the .lttngrc file. | |
281 | .fi | |
282 | ||
283 | .B OPTIONS: | |
284 | ||
285 | .nf | |
c9e32613 | 286 | \-h, \-\-help |
6991b181 | 287 | Show summary of possible options and commands. |
a3c5b534 FG |
288 | \-a, \-\-all |
289 | Destroy all sessions | |
c9e32613 | 290 | \-\-list-options |
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291 | Simple listing of options |
292 | .fi | |
293 | ||
294 | .IP | |
295 | ||
296 | .IP "\fBenable-channel\fP NAME[,NAME2,...] [-k|-u] [OPTIONS]" | |
297 | .nf | |
298 | Enable tracing channel | |
299 | ||
004f3466 DG |
300 | To enable an event, you must enable both the event and the channel that |
301 | contains it. | |
b883c01b | 302 | |
c9e32613 | 303 | If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc |
6991b181 | 304 | file. |
7972aab2 DG |
305 | |
306 | It is important to note that if a certain type of buffers is used, the session | |
307 | will be set with that type and all other subsequent channel need to have the | |
308 | same type. | |
6991b181 DG |
309 | .fi |
310 | ||
311 | .B OPTIONS: | |
312 | ||
313 | .nf | |
c9e32613 | 314 | \-h, \-\-help |
6991b181 | 315 | Show this help |
c9e32613 | 316 | \-\-list-options |
6991b181 | 317 | Simple listing of options |
391b9c72 | 318 | \-s, \-\-session NAME |
6991b181 | 319 | Apply on session name |
c9e32613 | 320 | \-k, \-\-kernel |
6991b181 | 321 | Apply to the kernel tracer |
c9e32613 | 322 | \-u, \-\-userspace |
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323 | Apply to the user-space tracer |
324 | ||
c9e32613 | 325 | \-\-discard |
6991b181 | 326 | Discard event when subbuffers are full (default) |
c9e32613 | 327 | \-\-overwrite |
6991b181 | 328 | Flight recorder mode : overwrites events when subbuffers are full |
391b9c72 | 329 | \-\-subbuf-size SIZE |
0a9c6494 DG |
330 | Subbuffer size in bytes {+k,+M,+G} |
331 | (default UST uid: 131072, UST pid: 4096, kernel: 262144, metadata: 4096) | |
1cb514ce | 332 | Rounded up to the next power of 2. |
391b9c72 | 333 | \-\-num-subbuf NUM |
0a9c6494 | 334 | Number of subbuffers. (default UST uid: 4, UST pid: 4, kernel: 4, metadata: 2) |
1cb514ce | 335 | Rounded up to the next power of 2. |
391b9c72 | 336 | \-\-switch-timer USEC |
0a9c6494 DG |
337 | Switch subbuffer timer interval in µsec. |
338 | (default UST uid: 0, UST pid: 0, kernel: 0, metadata: 0) | |
391b9c72 | 339 | \-\-read-timer USEC |
0a9c6494 DG |
340 | Read timer interval in µsec. |
341 | (default UST uid: 0, UST pid: 0, kernel: 200000, metadata: 0) | |
391b9c72 DG |
342 | \-\-output TYPE |
343 | Channel output type. Possible values: mmap, splice | |
0a9c6494 | 344 | (default UST uid: mmap, UST pid: mmap, kernel: splice, metadata: mmap) |
7972aab2 DG |
345 | \-\-buffers-uid |
346 | Use per UID buffer (\-u only). Buffers are shared between applications | |
347 | that have the same UID. | |
348 | \-\-buffers-pid | |
349 | Use per PID buffer (\-u only). Each application has its own buffers. | |
350 | \-\-buffers-global | |
351 | Use shared buffer for the whole system (\-k only) | |
1624d5b7 | 352 | \-C, \-\-tracefile-size SIZE |
e132a0d4 | 353 | Maximum size of each tracefile within a stream (in bytes). |
0a9c6494 | 354 | 0 means unlimited. (default: 0) |
1624d5b7 JD |
355 | \-W, \-\-tracefile-count COUNT |
356 | Used in conjunction with \-C option, this will limit the number | |
0a9c6494 | 357 | of files created to the specified count. 0 means unlimited. (default: 0) |
1624d5b7 JD |
358 | |
359 | .B EXAMPLES: | |
360 | ||
361 | $ lttng enable-channel -C 4096 -W 32 chan1 | |
362 | For each stream, the maximum size of a trace file will be 4096 bytes divided | |
363 | over a \fBmaximum\fP of 32 different files. The file count is appended after | |
364 | the stream number as seen in the following example. The last trace file is | |
365 | smaller than 4096 since it was not completely filled. | |
366 | ||
367 | ~/lttng-traces/[...]/chan1_0_0 (4096) | |
368 | ~/lttng-traces/[...]/chan1_0_1 (4096) | |
369 | ~/lttng-traces/[...]/chan1_0_2 (3245) | |
370 | ~/lttng-traces/[...]/chan1_1_0 (4096) | |
371 | ... | |
372 | ||
373 | $ lttng enable-channel -C 4096 | |
374 | This will create trace files of 4096 bytes and will create new ones as long as | |
375 | there is data available. | |
6991b181 DG |
376 | .fi |
377 | ||
378 | .IP | |
379 | ||
380 | .IP "\fBenable-event\fP NAME[,NAME2,...] [-k|-u] [OPTIONS]" | |
381 | .nf | |
382 | Enable tracing event | |
383 | ||
c9e32613 | 384 | A tracing event is always assigned to a channel. If \fB\-c, \-\-channel\fP is |
6991b181 | 385 | omitted, a default channel named '\fBchannel0\fP' is created and the event is |
c9e32613 | 386 | added to it. For the user-space tracer, using \fB\-a, \-\-all\fP is the same as |
6991b181 DG |
387 | using the wildcard "*". |
388 | ||
c9e32613 | 389 | If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc |
6991b181 DG |
390 | file. |
391 | .fi | |
392 | ||
393 | .B OPTIONS: | |
394 | ||
395 | .nf | |
c9e32613 | 396 | \-h, \-\-help |
6991b181 | 397 | Show summary of possible options and commands. |
c9e32613 | 398 | \-\-list-options |
6991b181 | 399 | Simple listing of options |
391b9c72 | 400 | \-s, \-\-session NAME |
6991b181 | 401 | Apply on session name |
391b9c72 | 402 | \-c, \-\-channel NAME |
6991b181 | 403 | Apply on channel name |
c9e32613 | 404 | \-a, \-\-all |
c5650942 DG |
405 | Enable all tracepoints and syscalls. This actually enable a single |
406 | wildcard event "*". | |
c9e32613 | 407 | \-k, \-\-kernel |
6991b181 | 408 | Apply for the kernel tracer |
c9e32613 | 409 | \-u, \-\-userspace |
6991b181 DG |
410 | Apply for the user-space tracer |
411 | ||
c9e32613 | 412 | \-\-tracepoint |
6991b181 DG |
413 | Tracepoint event (default) |
414 | - userspace tracer supports wildcards at end of string. Don't forget to | |
415 | quote to deal with bash expansion. | |
416 | e.g.: | |
417 | "*" | |
418 | "app_component:na*" | |
391b9c72 DG |
419 | \-\-loglevel NAME |
420 | Tracepoint loglevel range from 0 to loglevel. Listed in the help (\-h). | |
421 | \-\-loglevel-only NAME | |
422 | Tracepoint loglevel (only this loglevel). | |
423 | ||
424 | The loglevel or loglevel-only options should be combined with a | |
425 | tracepoint name or tracepoint wildcard. | |
c9e32613 | 426 | \-\-probe [addr | symbol | symbol+offset] |
6991b181 DG |
427 | Dynamic probe. Addr and offset can be octal (0NNN...), decimal (NNN...) |
428 | or hexadecimal (0xNNN...) | |
c9e32613 | 429 | \-\-function [addr | symbol | symbol+offset] |
6991b181 DG |
430 | Dynamic function entry/return probe. Addr and offset can be octal |
431 | (0NNN...), decimal (NNN...) or hexadecimal (0xNNN...) | |
c9e32613 | 432 | \-\-syscall |
6b8f2e64 DG |
433 | System call event. Enabling syscalls tracing (kernel tracer), you will |
434 | not be able to disable them with disable-event. This is a known | |
435 | limitation. You can disable the entire channel to do the trick. | |
9bd578f5 | 436 | |
919e300c | 437 | \-\-filter 'expression' |
6b8f2e64 | 438 | Set a filter on a newly enabled event. Filter expression on event |
ee8ccafa MD |
439 | fields and context. Event recording depends on evaluation. Only |
440 | specify on first activation of a given event within a session. | |
441 | Filter only allowed when enabling events within a session before | |
442 | tracing is started. If the filter fails to link with the event | |
443 | within the traced domain, the event will be discarded. | |
444 | Currently, filter is only implemented for the user-space tracer. | |
6b8f2e64 DG |
445 | |
446 | Expression examples: | |
447 | ||
448 | 'intfield > 500 && intfield < 503' | |
449 | '(stringfield == "test" || intfield != 10) && intfield > 33' | |
450 | 'doublefield > 1.1 && intfield < 5.3' | |
451 | ||
452 | Wildcards are allowed at the end of strings: | |
453 | 'seqfield1 == "te*"' | |
454 | In string literals, the escape character is a '\\'. Use '\\*' for | |
ee8ccafa MD |
455 | the '*' character, and '\\\\' for the '\\' character. Wildcard |
456 | match any sequence of characters, including an empty sub-string | |
457 | (match 0 or more characters). | |
458 | ||
459 | Context information can be used for filtering. The examples | |
460 | below show usage of context filtering on process name (with a | |
461 | wildcard), process ID range, and unique thread ID for filtering. | |
462 | The process and thread ID of running applications can be found | |
463 | under columns "PID" and "LWP" of the "ps -eLf" command. | |
464 | ||
465 | '$ctx.procname == "demo*"' | |
466 | '$ctx.vpid >= 4433 && $ctx.vpid < 4455' | |
467 | '$ctx.vtid == 1234' | |
6991b181 DG |
468 | .fi |
469 | ||
c9e32613 | 470 | .IP "\fBdisable-channel\fP NAME[,NAME2,...] [\-k|\-u] [OPTIONS]" |
6991b181 DG |
471 | .nf |
472 | Disable tracing channel | |
473 | ||
474 | Disabling a channel makes all event(s) in that channel to stop tracing. You can | |
475 | enable it back by calling \fBlttng enable-channel NAME\fP again. | |
476 | ||
c9e32613 | 477 | If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc |
6991b181 DG |
478 | file. |
479 | .fi | |
480 | ||
481 | .B OPTIONS: | |
482 | ||
6b8f2e64 DG |
483 | .nf |
484 | \-h, \-\-help | |
485 | Show summary of possible options and commands. | |
486 | \-\-list-options | |
487 | Simple listing of options | |
488 | \-s, \-\-session NAME | |
6991b181 | 489 | Apply on session name |
c9e32613 | 490 | \-k, \-\-kernel |
6991b181 | 491 | Apply for the kernel tracer |
c9e32613 | 492 | \-u, \-\-userspace |
6991b181 DG |
493 | Apply for the user-space tracer |
494 | .fi | |
495 | ||
c9e32613 | 496 | .IP "\fBdisable-event\fP NAME[,NAME2,...] [\-k|\-u] [OPTIONS]" |
6991b181 DG |
497 | .nf |
498 | Disable tracing event | |
499 | ||
500 | The event, once disabled, can be re-enabled by calling \fBlttng enable-event | |
501 | NAME\fP again. | |
502 | ||
c9e32613 | 503 | If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc |
6991b181 DG |
504 | file. |
505 | .fi | |
506 | ||
507 | .B OPTIONS: | |
508 | ||
509 | .nf | |
c9e32613 | 510 | \-h, \-\-help |
6991b181 | 511 | Show summary of possible options and commands. |
c9e32613 | 512 | \-\-list-options |
6991b181 | 513 | Simple listing of options |
391b9c72 | 514 | \-s, \-\-session NAME |
6991b181 | 515 | Apply on session name |
c5650942 DG |
516 | \-a, \-\-all-events |
517 | Disable all events. This does NOT disable "*" but rather | |
518 | every known events of the session. | |
c9e32613 | 519 | \-k, \-\-kernel |
6991b181 | 520 | Apply for the kernel tracer |
c9e32613 | 521 | \-u, \-\-userspace |
6991b181 DG |
522 | Apply for the user-space tracer |
523 | .fi | |
524 | ||
c9e32613 | 525 | .IP "\fBlist\fP [\-k|\-u] [SESSION [SESSION_OPTIONS]]" |
6991b181 | 526 | .nf |
c9e32613 | 527 | List tracing session information. |
6991b181 DG |
528 | |
529 | With no arguments, it will list available tracing session(s). | |
530 | ||
fa072eae YB |
531 | With the session name, it will display the details of the session including |
532 | the trace file path, the associated channels and their state (activated | |
d829b38c | 533 | and deactivated), the activated events and more. |
fa072eae | 534 | |
c9e32613 | 535 | With \-k alone, it will list all available kernel events (except the system |
6991b181 | 536 | calls events). |
c9e32613 DG |
537 | With \-u alone, it will list all available user-space events from registered |
538 | applications. Here is an example of 'lttng list \-u': | |
6991b181 DG |
539 | |
540 | PID: 7448 - Name: /tmp/lttng-ust/tests/hello/.libs/lt-hello | |
541 | ust_tests_hello:tptest_sighandler (type: tracepoint) | |
542 | ust_tests_hello:tptest (type: tracepoint) | |
543 | ||
544 | You can now enable any event listed by using the name : | |
545 | \fBust_tests_hello:tptest\fP. | |
546 | .fi | |
547 | ||
548 | .B OPTIONS: | |
549 | ||
550 | .nf | |
c9e32613 | 551 | \-h, \-\-help |
6991b181 | 552 | Show summary of possible options and commands. |
c9e32613 | 553 | \-\-list-options |
6991b181 | 554 | Simple listing of options |
c9e32613 | 555 | \-k, \-\-kernel |
d829b38c | 556 | Select kernel domain |
c9e32613 | 557 | \-u, \-\-userspace |
6991b181 DG |
558 | Select user-space domain. |
559 | ||
6b8f2e64 DG |
560 | .B SESSION OPTIONS: |
561 | ||
c9e32613 | 562 | \-c, \-\-channel NAME |
6991b181 | 563 | List details of a channel |
c9e32613 | 564 | \-d, \-\-domain |
6991b181 DG |
565 | List available domain(s) |
566 | .fi | |
567 | ||
568 | .IP "\fBset-session\fP NAME" | |
569 | .nf | |
570 | Set current session name | |
571 | ||
572 | Will change the session name in the .lttngrc file. | |
573 | .fi | |
574 | ||
575 | .B OPTIONS: | |
576 | ||
577 | .nf | |
c9e32613 | 578 | \-h, \-\-help |
6991b181 | 579 | Show summary of possible options and commands. |
c9e32613 | 580 | \-\-list-options |
6991b181 DG |
581 | Simple listing of options |
582 | .fi | |
583 | ||
584 | .IP | |
585 | ||
6b8f2e64 | 586 | .IP "\fBstart\fP [NAME] [OPTIONS]" |
6991b181 DG |
587 | .nf |
588 | Start tracing | |
589 | ||
590 | It will start tracing for all tracers for a specific tracing session. | |
591 | ||
592 | If NAME is omitted, the session name is taken from the .lttngrc file. | |
593 | .fi | |
594 | ||
595 | .B OPTIONS: | |
596 | ||
597 | .nf | |
c9e32613 | 598 | \-h, \-\-help |
6991b181 | 599 | Show summary of possible options and commands. |
c9e32613 | 600 | \-\-list-options |
6991b181 DG |
601 | Simple listing of options |
602 | .fi | |
603 | ||
604 | .IP | |
605 | ||
6b8f2e64 | 606 | .IP "\fBstop\fP [NAME] [OPTIONS]" |
6991b181 DG |
607 | .nf |
608 | Stop tracing | |
609 | ||
391b9c72 DG |
610 | It will stop tracing for all tracers for a specific tracing session. Before |
611 | returning, the command checks for data availability meaning that it will wait | |
612 | until the trace is readable for the session. Use \-\-no-wait to avoid this | |
613 | behavior. | |
6991b181 DG |
614 | |
615 | If NAME is omitted, the session name is taken from the .lttngrc file. | |
616 | .fi | |
617 | ||
618 | .B OPTIONS: | |
619 | ||
620 | .nf | |
c9e32613 | 621 | \-h, \-\-help |
6991b181 | 622 | Show summary of possible options and commands. |
c9e32613 | 623 | \-\-list-options |
6991b181 | 624 | Simple listing of options |
391b9c72 DG |
625 | \-\-no-wait |
626 | Don't wait for data availability. | |
6991b181 DG |
627 | .fi |
628 | ||
629 | .IP | |
630 | ||
631 | .IP "\fBversion\fP" | |
632 | .nf | |
633 | Show version information | |
634 | .fi | |
635 | ||
636 | .B OPTIONS: | |
637 | ||
638 | .nf | |
c9e32613 | 639 | \-h, \-\-help |
6991b181 | 640 | Show summary of possible options and commands. |
c9e32613 | 641 | \-\-list-options |
6991b181 DG |
642 | Simple listing of options |
643 | .fi | |
644 | ||
645 | .IP | |
646 | ||
647 | .IP "\fBview\fP [SESSION_NAME] [OPTIONS]" | |
648 | .nf | |
649 | View traces of a tracing session | |
650 | ||
651 | By default, the babeltrace viewer will be used for text viewing. | |
652 | ||
fa072eae YB |
653 | If SESSION_NAME is omitted, the session name is taken from the .lttngrc file. |
654 | ||
6991b181 DG |
655 | .fi |
656 | ||
657 | .B OPTIONS: | |
658 | ||
659 | .nf | |
c9e32613 | 660 | \-h, \-\-help |
6991b181 | 661 | Show this help |
c9e32613 | 662 | \-\-list-options |
6991b181 | 663 | Simple listing of options |
c9e32613 | 664 | \-t, \-\-trace-path PATH |
6991b181 | 665 | Trace directory path for the viewer |
c9e32613 | 666 | \-e, \-\-viewer CMD |
6991b181 DG |
667 | Specify viewer and/or options to use |
668 | This will completely override the default viewers so | |
669 | please make sure to specify the full command. The trace | |
670 | directory path of the session will be appended at the end | |
671 | to the arguments | |
672 | .fi | |
673 | ||
c206d957 | 674 | .SH "EXIT VALUES" |
6b8f2e64 DG |
675 | On success 0 is returned and a positive value on error. Value of 1 means a command |
676 | error, 2 an undefined command, 3 a fatal error and 4 a command warning meaning that | |
677 | something went wrong during the command. | |
c206d957 | 678 | |
6b8f2e64 DG |
679 | Any other value above 10, please refer to |
680 | .BR <lttng/lttng-error.h> | |
681 | for a detailed list or use lttng_strerror() to get a human readable string of | |
682 | the error code. | |
c206d957 | 683 | |
c206d957 | 684 | .PP |
6991b181 DG |
685 | .SH "ENVIRONMENT VARIABLES" |
686 | ||
687 | .PP | |
688 | Note that all command line options override environment variables. | |
689 | .PP | |
690 | ||
691 | .PP | |
05833633 | 692 | .IP "LTTNG_SESSIOND_PATH" |
c9e32613 DG |
693 | Allows one to specify the full session daemon binary path to lttng command line |
694 | tool. You can also use \-\-sessiond-path option having the same effect. | |
6991b181 | 695 | .SH "SEE ALSO" |
6b8f2e64 DG |
696 | .BR babeltrace(1), |
697 | .BR lttng-ust(3), | |
698 | .BR lttng-sessiond(8), | |
699 | .BR lttng-relayd(8), | |
700 | .BR lttng-health-check(3) | |
6991b181 DG |
701 | .SH "BUGS" |
702 | ||
6991b181 | 703 | If you encounter any issues or usability problem, please report it on our |
6b8f2e64 DG |
704 | mailing list <lttng-dev@lists.lttng.org> to help improve this project or |
705 | at https://bugs.lttng.org which is a bugtracker. | |
6991b181 DG |
706 | .SH "CREDITS" |
707 | ||
708 | .PP | |
c9e32613 | 709 | lttng is distributed under the GNU General Public License version 2. See the file |
6991b181 DG |
710 | COPYING for details. |
711 | .PP | |
712 | A Web site is available at http://lttng.org for more information on the LTTng | |
713 | project. | |
714 | .PP | |
715 | You can also find our git tree at http://git.lttng.org. | |
716 | .PP | |
717 | Mailing lists for support and development: <lttng-dev@lists.lttng.org>. | |
718 | .PP | |
719 | You can find us on IRC server irc.oftc.net (OFTC) in #lttng. | |
720 | .PP | |
721 | .SH "THANKS" | |
722 | ||
723 | .PP | |
724 | Thanks to Yannick Brosseau without whom this project would never have been so | |
725 | lean and mean! Also thanks to the Ericsson teams working on tracing which | |
fa072eae | 726 | helped us greatly with detailed bug reports and unusual test cases. |
6991b181 DG |
727 | |
728 | Thanks to our beloved packager Alexandre Montplaisir-Goncalves (Ubuntu and PPA | |
729 | maintainer) and Jon Bernard for our Debian packages. | |
730 | ||
731 | Special thanks to Michel Dagenais and the DORSAL laboratory at Polytechnique de | |
732 | Montreal for the LTTng journey. | |
c9e32613 | 733 | .PP |
6991b181 DG |
734 | .SH "AUTHORS" |
735 | ||
736 | .PP | |
737 | lttng-tools was originally written by Mathieu Desnoyers, Julien Desfossez and | |
738 | David Goulet. More people have since contributed to it. It is currently | |
739 | maintained by David Goulet <dgoulet@efficios.com>. | |
740 | .PP |