Commit | Line | Data |
---|---|---|
c924c2c6 | 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
2 | <html> | |
3 | <head> | |
f6e6ee82 | 4 | <title>Linux Trace Toolkit Next Generation Manual</title> |
c924c2c6 | 5 | </head> |
6 | <body> | |
7 | ||
f6e6ee82 | 8 | <h1>Linux Trace Toolkit Next Generation Manual</h1> |
c924c2c6 | 9 | |
c924c2c6 | 10 | Author : Mathieu Desnoyers, September 2005<br> |
24070967 | 11 | Last update : January 21st, 2009<br> |
bc58079d | 12 | (originally known as the LTTng QUICKSTART guide) |
24070967 | 13 | |
14 | <h2>Table of Contents</h2> | |
24070967 | 15 | |
d58b406f | 16 | <ul> |
f9ff56f3 | 17 | <li><a href="#intro" name="TOCintro">Introduction</a></li> |
7e77d1a9 | 18 | <ul> |
19 | <li><a href="#arch" name="TOCarch">Supported architectures</a></li> | |
20 | </ul> | |
d58b406f | 21 | |
24070967 | 22 | <li><a href="#section1" name="TOCsection1">Installing LTTng and LTTV from |
6f88b01d | 23 | sources</a></li> |
38b04cd7 | 24 | <ul> |
2d540155 | 25 | <li><a href="#prerequisites" name="TOCprerequisites">Prerequisistes</li> |
26 | <li><a href="#getlttng" name="TOCgetlttng">Getting the LTTng packages</li> | |
27 | <li><a href="#getlttngsrc" name="TOCgetlttngsrc">Getting the LTTng kernel sources</li> | |
28 | <li><a href="#installlttng" name="TOCinstalllttng">Installing a LTTng kernel</li> | |
6f88b01d | 29 | <li><a href="#editconfig" name="TOCeditconfig">Editing the system wide |
30 | configuration</a> | |
31 | <li><a href="#getlttctl" name="TOCgetlttctl">Getting and installing the | |
2d540155 | 32 | ltt-control package</li> |
33 | <li><a href="#userspacetracing" name="TOCuserspacetracing">Userspace Tracing</li> | |
6f88b01d | 34 | <li><a href="#getlttv" name="TOCgetlttv">Getting and installing the LTTV package</ul> |
d58b406f | 35 | |
24070967 | 36 | <li><a href="#section2" name="TOCsection2">Using LTTng and LTTV</a></li> |
d58b406f | 37 | <ul> |
38 | <li><a href="#uselttvgui" name="TOCuselttvgui">Use graphical LTTV to control | |
39 | tracing and analyse traces</a></li> | |
40 | <li><a href="#uselttngtext" name="TOCuselttngtext">Use text mode LTTng to | |
f7828b7c | 41 | control tracing</a></li> |
d58b406f | 42 | <li><a href="#uselttvtext" name="TOCuselttvtext">Use text mode LTTV</a></li> |
43 | <li><a href="#hybrid" name="TOChybrid">Tracing in "Hybrid" mode</a></li> | |
44 | <li><a href="#flight" name="TOCflight">Tracing in flight recorder mode</a></li> | |
d58b406f | 45 | </ul> |
46 | ||
24070967 | 47 | <li><a href="#section3" name="TOCsection3">Adding kernel and user-space |
47e2b195 | 48 | instrumentation</a> |
49 | <ul> | |
50 | <li><a href="#kerneltp" name="TOCkerneltp">Adding kernel instrumentation</a></li> | |
51 | <li><a href="#usertp" name="TOCusertp">Adding userspace instrumentation</a></li> | |
52 | </ul> | |
d58b406f | 53 | |
633bc4a3 | 54 | <li><a href="#section4" name="TOCsection4">Creating Debian and RPM packages |
98dde887 | 55 | from LTTV</a></li> |
56 | <ul> | |
57 | <li><a href="#pkgdebian" name="TOCpkgdebian">Create custom LTTV Debian | |
58 | <li><a href="#pkglttng" name="TOCpkglttng">Create custom LTTng packages</a></li> | |
98dde887 | 59 | </ul> |
c924c2c6 | 60 | |
f9ff56f3 | 61 | </ul> |
62 | ||
63 | <hr /> | |
64 | ||
b9e1fab1 | 65 | <h2><a href="#TOCintro" name="intro">Introduction</a></h2> |
c924c2c6 | 66 | <p> |
70a3fc43 | 67 | This document is made of five parts : the first one explains how |
24070967 | 68 | to install LTTng and LTTV from sources, the second one describes the steps |
633bc4a3 | 69 | to follow to trace a system and view it. The third part explains |
c924c2c6 | 70 | briefly how to add a new trace point to the kernel and to user space |
42cf459d | 71 | applications. The fourth and last part explains how to create Debian or RPM |
72 | packages from the LTTng and LTTV sources. | |
c924c2c6 | 73 | <p> |
24070967 | 74 | These operations are made for installing the LTTng 0.86 tracer on a linux 2.6.X |
c924c2c6 | 75 | kernel. You will also find instructions for installation of LTTV 0.12.x : the |
76 | Linux Trace Toolkit Viewer. | |
24070967 | 77 | To see the list of compatibilities between LTTng, ltt-control, LTTV, please |
78 | refer to : | |
c924c2c6 | 79 | <a |
80 | href="http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/lttng-lttv-compatibility.html">LTTng+LTTV versions compatibility</a> | |
534f65eb | 81 | |
82 | The ongoing work had the Linux Kernel Markers integrated in the mainline Linux | |
83 | kernel since Linux 2.6.24 and the Tracepoints since 2.6.28. In its current | |
84 | state, the lttng patchset is necessary to have the trace clocksource, the | |
85 | instrumentation and the LTTng high-speed data extraction mechanism added to the | |
86 | kernel. | |
c924c2c6 | 87 | |
24070967 | 88 | <br> |
89 | <br> | |
7e77d1a9 | 90 | <h3><a href="#TOCarch" name="arch">Supported architectures</a></h3> |
70a3fc43 | 91 | <br> |
c924c2c6 | 92 | LTTng :<br> |
70a3fc43 | 93 | <br> |
c924c2c6 | 94 | <li> x86 32/64 bits |
95 | <li> PowerPC 32 and 64 bits | |
f0fcce6d | 96 | <li> ARMv7 OMAP3 |
97 | <li> Other ARM (with limited timestamping precision, e.g. 1HZ. Need | |
c924c2c6 | 98 | architecture-specific support for better precision) |
99 | <li> MIPS | |
1aeeacdb | 100 | <li> sh (partial architecture-specific instrumentation) |
101 | <li> sparc64 (partial architecture-specific instrumentation) | |
102 | <li> s390 (partial architecture-specific instrumentation) | |
103 | <li> Other architectures supported without architecture-specific instrumentation | |
104 | and with low-resolution timestamps.<br> | |
c924c2c6 | 105 | <br> |
24070967 | 106 | <br> |
c924c2c6 | 107 | LTTV :<br> |
70a3fc43 | 108 | <br> |
c924c2c6 | 109 | <li> Intel 32/64 bits |
110 | <li> PowerPC 32 and 64 bits | |
111 | <li> Possibly others. Takes care of endianness and type size difference between | |
112 | the LTTng traces and the LTTV analysis tool. | |
113 | ||
f9ff56f3 | 114 | <hr /> |
115 | ||
c924c2c6 | 116 | |
89aa576c | 117 | <h2><a href="#TOCsection1" name="section1">Installation from sources</a></h2> |
633bc4a3 | 118 | <p> |
c924c2c6 | 119 | |
6f88b01d | 120 | <h3><a href="#TOCprerequisites" name="prerequisites">Prerequisites</a></h3> |
633bc4a3 | 121 | <ul> |
122 | <p> | |
c924c2c6 | 123 | Tools needed to follow the package download steps : |
124 | ||
633bc4a3 | 125 | <li>wget |
126 | <li>bzip2 | |
127 | <li>gzip | |
128 | <li>tar | |
c924c2c6 | 129 | |
633bc4a3 | 130 | <p> |
c924c2c6 | 131 | You have to install the standard development libraries and programs necessary |
132 | to compile a kernel : | |
133 | ||
84cf5903 | 134 | <PRE> |
c924c2c6 | 135 | (from Documentation/Changes in the Linux kernel tree) |
84cf5903 | 136 | Gnu C 2.95.3 # gcc --version |
137 | Gnu make 3.79.1 # make --version | |
138 | binutils 2.12 # ld -v | |
139 | util-linux 2.10o # fdformat --version | |
140 | module-init-tools 0.9.10 # depmod -V | |
141 | </PRE> | |
c924c2c6 | 142 | |
633bc4a3 | 143 | <p> |
c924c2c6 | 144 | You might also want to have libncurses5 to have the text mode kernel |
145 | configuration menu, but there are alternatives. | |
146 | ||
633bc4a3 | 147 | <p> |
c924c2c6 | 148 | Prerequisites for LTTV 0.x.x installation are : |
149 | ||
84cf5903 | 150 | <PRE> |
151 | gcc 3.2 or better | |
152 | gtk 2.4 or better development libraries | |
c924c2c6 | 153 | (Debian : libgtk2.0, libgtk2.0-dev) |
154 | (Fedora : gtk2, gtk2-devel) | |
155 | note : For Fedora users : this might require at least core 3 from Fedora, | |
156 | or you might have to compile your own GTK2 library. | |
84cf5903 | 157 | glib 2.4 or better development libraries |
c924c2c6 | 158 | (Debian : libglib2.0-0, libglib2.0-dev) |
159 | (Fedora : glib2, glib2-devel) | |
84cf5903 | 160 | libpopt development libraries |
c924c2c6 | 161 | (Debian : libpopt0, libpopt-dev) |
162 | (Fedora : popt) | |
84cf5903 | 163 | libpango development libraries |
c924c2c6 | 164 | (Debian : libpango1.0, libpango1.0-dev) |
165 | (Fedora : pango, pango-devel) | |
84cf5903 | 166 | libc6 development librairies |
c924c2c6 | 167 | (Debian : libc6, libc6-dev) |
168 | (Fedora : glibc, glibc) | |
84cf5903 | 169 | </PRE> |
633bc4a3 | 170 | </ul> |
c924c2c6 | 171 | |
c8997124 | 172 | <li>Reminder</li> |
c924c2c6 | 173 | |
c8997124 | 174 | <p> |
633bc4a3 | 175 | See the list of compatibilities between LTTng, ltt-control and LTTV at : |
176 | <a | |
177 | href="http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/lttng-lttv-compatibility.html">LTTng+LTTV | |
178 | versions compatibility</a>. | |
c924c2c6 | 179 | |
180 | ||
6f88b01d | 181 | <h3><a href="#TOCgetlttng" name="getlttng">Getting the LTTng packages</a></h3> |
c924c2c6 | 182 | |
c8997124 | 183 | <PRE> |
c924c2c6 | 184 | su - |
185 | mkdir /usr/src/lttng | |
186 | cd /usr/src/lttng | |
187 | (see http://ltt.polymtl.ca/lttng for package listing) | |
188 | wget http://ltt.polymtl.ca/lttng/patch-2.6.X-lttng-0.x.xx.tar.bz2 | |
189 | bzip2 -cd patch-2.6.X-lttng-0.x.xx.tar.bz2 | tar xvof - | |
c8997124 | 190 | </PRE> |
c924c2c6 | 191 | |
192 | ||
6f88b01d | 193 | <h3><a href="#TOCgetlttngsrc" name="getlttngsrc">Getting LTTng kernel sources</a></h3> |
c924c2c6 | 194 | |
c8997124 | 195 | <PRE> |
c924c2c6 | 196 | su - |
197 | cd /usr/src | |
198 | wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.X.tar.bz2 | |
199 | bzip2 -cd linux-2.6.X.tar.bz2 | tar xvof - | |
200 | cd linux-2.6.X | |
201 | - For LTTng 0.9.4- cat /usr/src/lttng/patch*-2.6.X-lttng-0.x.xx* | patch -p1 | |
202 | - For LTTng 0.9.5+ apply the patches in the order specified in the series file, | |
203 | or use quilt | |
204 | cd .. | |
205 | mv linux-2.6.X linux-2.6.X-lttng-0.x.xx | |
c8997124 | 206 | </PRE> |
c924c2c6 | 207 | |
208 | ||
6f88b01d | 209 | <h3><a href="#TOCinstalllttng" name="installlttng">Installing a LTTng kernel</a></h3> |
c924c2c6 | 210 | |
c8997124 | 211 | <PRE> |
c924c2c6 | 212 | su - |
213 | cd /usr/src/linux-2.6.X-lttng-0.x.xx | |
214 | make menuconfig (or make xconfig or make config) | |
215 | Select the < Help > button if you are not familiar with kernel | |
216 | configuration. | |
217 | Items preceded by [*] means they has to be built into the kernel. | |
218 | Items preceded by [M] means they has to be built as modules. | |
219 | Items preceded by [ ] means they should be removed. | |
220 | go to the "General setup" section | |
221 | Select the following options : | |
222 | [*] Prompt for development and/or incomplete code/drivers | |
223 | [*] Activate markers | |
224 | [*] Activate userspace markers ABI (experimental, optional) | |
225 | [*] Immediate value optimization (optional) | |
226 | [*] Linux Trace Toolkit Next Generation (LTTng) ---> | |
227 | <M> or <*> Compile lttng tracing probes | |
228 | <M> or <*> Linux Trace Toolkit High-speed Lockless Data Relay | |
229 | <M> or <*> Linux Trace Toolkit Lock-Protected Data Relay | |
230 | <M> or <*> Linux Trace Toolkit Serializer | |
231 | <M> or <*> Linux Trace Toolkit Marker Control | |
232 | <M> or <*> Linux Trace Toolkit Tracer | |
233 | [*] Align Linux Trace Toolkit Traces | |
234 | <M> or <*> Support logging events from userspace | |
235 | [*] Support trace extraction from crash dump | |
236 | <M> or <*> Linux Trace Toolkit Trace Controller | |
237 | <M> or <*> Linux Trace Toolkit State Dump | |
238 | Select <Exit> | |
239 | Select <Exit> | |
240 | Select <Yes> | |
241 | make | |
242 | make modules_install | |
243 | (if necessary, create a initrd with mkinitrd or your preferate alternative) | |
244 | (mkinitrd -o /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx) | |
245 | ||
246 | -- on X86, X86_64 | |
247 | make install | |
248 | reboot | |
249 | Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader. | |
250 | ||
251 | -- on PowerPC | |
252 | cp vmlinux.strip /boot/vmlinux-2.6.X-lttng-0.x.xx | |
253 | cp System.map /boot/System.map-2.6.X-lttng-0.x.xx | |
254 | cp .config /boot/config-2.6.X-lttng-0.x.xx | |
255 | depmod -ae -F /boot/System.map-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx | |
256 | mkinitrd /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx | |
257 | (edit /etc/yaboot.conf to add a new entry pointing to your kernel : the entry | |
258 | that comes first is the default kernel) | |
259 | ybin | |
260 | select the right entry at the yaboot prompt (see choices : tab, select : type | |
261 | the kernel name followed by enter) | |
262 | Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader. | |
263 | -- | |
c8997124 | 264 | </PRE> |
c924c2c6 | 265 | |
6f88b01d | 266 | <h3><a href="#TOCeditconfig" name="editconfig">Editing the system wide |
267 | configuration</a></h3> | |
c924c2c6 | 268 | |
c8997124 | 269 | <p> |
c924c2c6 | 270 | You must activate debugfs and specify a mount point. This is typically done in |
c8997124 | 271 | fstab such that it happens at boot time. If you have never used DebugFS before, |
272 | these operation would do this for you : | |
c924c2c6 | 273 | |
c8997124 | 274 | <PRE> |
c924c2c6 | 275 | mkdir /mnt/debugfs |
276 | cp /etc/fstab /etc/fstab.lttng.bkp | |
277 | echo "debugfs /mnt/debugfs debugfs rw 0 0" >> /etc/fstab | |
c8997124 | 278 | </PRE> |
c924c2c6 | 279 | |
c8997124 | 280 | <p> |
c924c2c6 | 281 | then, rebooting or issuing the following command will activate debugfs : |
c8997124 | 282 | <PRE> |
c924c2c6 | 283 | mount /mnt/debugfs |
c8997124 | 284 | </PRE> |
c924c2c6 | 285 | |
c8997124 | 286 | <p> |
c924c2c6 | 287 | You need to load the LTT modules to be able to control tracing from user |
288 | space. This is done by issuing the following commands. Note however | |
289 | these commands load all LTT modules. Depending on what options you chose to | |
290 | compile statically, you may not need to issue all these commands. | |
291 | ||
c8997124 | 292 | <PRE> |
c924c2c6 | 293 | modprobe ltt-trace-control |
294 | modprobe ltt-marker-control | |
295 | modprobe ltt-tracer | |
296 | modprobe ltt-serialize | |
297 | modprobe ltt-relay | |
298 | modprobe ipc-trace | |
299 | modprobe kernel-trace | |
300 | modprobe mm-trace | |
301 | modprobe net-trace | |
302 | modprobe fs-trace | |
303 | modprobe jbd2-trace | |
304 | modprobe ext4-trace | |
305 | modprobe syscall-trace | |
306 | modprobe trap-trace | |
307 | #if locking tracing is wanted, uncomment the following | |
308 | #modprobe lockdep-trace | |
c8997124 | 309 | </PRE> |
c924c2c6 | 310 | |
c8997124 | 311 | <p> |
c924c2c6 | 312 | If you want to have complete information about the kernel state (including all |
313 | the process names), you need to load the ltt-statedump module. This is done by | |
314 | issuing the command : | |
315 | ||
c8997124 | 316 | <PRE> |
c924c2c6 | 317 | modprobe ltt-statedump |
c8997124 | 318 | </PRE> |
319 | <p> | |
c924c2c6 | 320 | You can automate at boot time loading the ltt-control module by : |
321 | ||
c8997124 | 322 | <PRE> |
c924c2c6 | 323 | cp /etc/modules /etc/modules.bkp |
324 | echo ltt-trace-control >> /etc/modules | |
325 | echo ltt-marker-control >> /etc/modules | |
326 | echo ltt-tracer >> /etc/modules | |
327 | echo ltt-serialize >> /etc/modules | |
328 | echo ltt-relay >> /etc/modules | |
329 | echo ipc-trace >> /etc/modules | |
330 | echo kernel-trace >> /etc/modules | |
331 | echo mm-trace >> /etc/modules | |
332 | echo net-trace >> /etc/modules | |
333 | echo fs-trace >> /etc/modules | |
334 | echo jbd2-trace >> /etc/modules | |
335 | echo ext4-trace >> /etc/modules | |
336 | echo syscall-trace >> /etc/modules | |
337 | echo trap-trace >> /etc/modules | |
338 | #if locking tracing is wanted, uncomment the following | |
339 | #echo lockdep-trace >> /etc/modules | |
c8997124 | 340 | </PRE> |
c924c2c6 | 341 | |
6f88b01d | 342 | |
343 | <h3><a href="#TOCgetlttctl" name="getlttctl">Getting and installing the | |
344 | ltt-control package (on the traced machine)</a></h3> | |
c8997124 | 345 | <p> |
c924c2c6 | 346 | (note : the ltt-control package contains lttd and lttctl. Although it has the |
347 | same name as the ltt-control kernel module, they are *not* the same thing.) | |
c8997124 | 348 | |
349 | <PRE> | |
c924c2c6 | 350 | su - |
351 | cd /usr/src | |
352 | wget http://ltt.polymtl.ca/lttng/ltt-control-0.x-xxxx2006.tar.gz | |
353 | gzip -cd ltt-control-0.x-xxxx2008.tar.gz | tar xvof - | |
354 | cd ltt-control-0.x-xxxx2006 | |
355 | (refer to README to see the development libraries that must be installed on you | |
356 | system) | |
357 | ./configure | |
358 | make | |
359 | make install | |
4411682a MD |
360 | # (run ldconfig to ensure new shared objects are taken into account) |
361 | ldconfig | |
c8997124 | 362 | </PRE> |
c924c2c6 | 363 | |
38b04cd7 | 364 | <h3><a href="#TOCuserspacetracing" name="userspacetracing">Userspace tracing</a></h3> |
c924c2c6 | 365 | |
c8997124 | 366 | <PRE> |
c924c2c6 | 367 | Make sure you selected the kernel menuconfig option : |
368 | <M> or <*> Support logging events from userspace | |
369 | And that the ltt-userspace-event kernel module is loaded if selected as a | |
370 | module. | |
371 | ||
372 | Simple userspace tracing is available through | |
373 | echo "some text to record" > /mnt/debugfs/ltt/write_event | |
374 | ||
375 | It will appear in the trace under event : | |
376 | channel : userspace | |
377 | event name : event | |
c8997124 | 378 | </PRE> |
c924c2c6 | 379 | |
6f88b01d | 380 | <h3><a href="#TOCgetlttv" name="getlttv">Getting and installing the LTTV package |
381 | (on the visualisation machine, same | |
382 | or different from the visualisation machine)</a></h3> | |
c924c2c6 | 383 | |
c8997124 | 384 | <PRE> |
c924c2c6 | 385 | su - |
386 | cd /usr/src | |
387 | wget http://ltt.polymtl.ca/packages/lttv-0.x.xx-xxxx2008.tar.gz | |
388 | gzip -cd lttv-0.x.xx-xxxx2008.tar.gz | tar xvof - | |
389 | cd lttv-0.x.xx-xxxx2008 | |
390 | (refer to README to see the development libraries that must be installed on your | |
391 | system) | |
392 | ./configure | |
393 | make | |
394 | make install | |
4411682a MD |
395 | # (run ldconfig to ensure new shared objects are taken into account) |
396 | ldconfig | |
13d7a628 | 397 | </PRE> |
c924c2c6 | 398 | |
c8997124 | 399 | <hr /> |
c924c2c6 | 400 | |
c924c2c6 | 401 | |
89aa576c | 402 | <h2><a href="#TOCsection2" name="section2">Using LTTng and LTTV</a></h2> |
c924c2c6 | 403 | |
d58b406f | 404 | <li><b>IMPORTANT : Arm Linux Kernel Markers after each boot before tracing</b></li> |
c8997124 | 405 | <PRE> |
c924c2c6 | 406 | ltt-armall |
c8997124 | 407 | </PRE> |
c924c2c6 | 408 | |
d58b406f | 409 | <h3><a href="#TOCuselttvgui" name="uselttvgui">Use graphical LTTV to control |
410 | tracing and analyse traces</a></h3> | |
c8997124 | 411 | <PRE> |
c924c2c6 | 412 | lttv-gui (or /usr/local/bin/lttv-gui) |
413 | - Spot the "Tracing Control" icon : click on it | |
414 | (it's a traffic light icon) | |
415 | - enter the root password | |
416 | - click "start" | |
417 | - click "stop" | |
418 | - Yes | |
419 | * You should now see a trace | |
c8997124 | 420 | </PRE> |
c924c2c6 | 421 | |
d58b406f | 422 | <h3><a href="#TOCuselttngtext" name="uselttngtext">Use text mode LTTng to control tracing</a></h3> |
c8997124 | 423 | <PRE> |
c924c2c6 | 424 | The tracing can be controlled from a terminal by using the lttctl command (as |
425 | root). | |
426 | ||
427 | Start tracing : | |
428 | ||
429 | lttctl -C -w /tmp/trace1 trace1 | |
430 | ||
431 | Stop tracing and destroy trace channels : | |
432 | ||
433 | lttctl -D trace1 | |
434 | ||
435 | see lttctl --help for details. | |
df7f63ab | 436 | </PRE> |
c8997124 | 437 | <p> |
c924c2c6 | 438 | (note : to see if the buffers has been filled, look at the dmesg output after |
196f71c4 | 439 | lttctl -D or after stopping tracing from the GUI, it will show an event lost |
c924c2c6 | 440 | count. If it is the case, try using larger buffers. See lttctl --help to learn |
441 | how. lttv now also shows event lost messages in the console when loading a trace | |
442 | with missing events or lost subbuffers.) | |
443 | ||
d58b406f | 444 | <h3><a href="#TOCuselttvtext" name="uselttvtext">Use text mode LTTV</a></h3> |
c8997124 | 445 | <p> |
c924c2c6 | 446 | Feel free to look in /usr/local/lib/lttv/plugins to see all the text and |
447 | graphical plugins available. | |
c8997124 | 448 | <p> |
c924c2c6 | 449 | For example, a simple trace dump in text format is available with : |
c8997124 | 450 | <PRE> |
c924c2c6 | 451 | lttv -m textDump -t /tmp/trace |
c8997124 | 452 | </PRE> |
c8997124 | 453 | <p> |
454 | See lttv -m textDump --help for detailed command line options of textDump. | |
c8997124 | 455 | <p> |
c924c2c6 | 456 | It is, in the current state of the project, very useful to use "grep" on the |
457 | text output to filter by specific event fields. You can later copy the timestamp | |
458 | of the events to the clipboard and paste them in the GUI by clicking on the | |
459 | bottom right label "Current time". Support for this type of filtering should | |
460 | be added to the filter module soon. | |
461 | ||
d58b406f | 462 | <h3><a href="#TOChybrid" name="hybrid">Tracing in "Hybrid" mode</a></h3> |
c8997124 | 463 | <p> |
c924c2c6 | 464 | Starting from LTTng 0.5.105 and ltt-control 0.20, a new mode can be used : |
465 | hybrid. It can be especially useful when studying big workloads on a long period | |
466 | of time. | |
c8997124 | 467 | <p> |
c924c2c6 | 468 | When using this mode, the most important, low rate control information will be |
469 | recorded during all the trace by lttd (i.e. process creation/exit). The high | |
470 | rate information (i.e. interrupt/traps/syscall entry/exit) will be kept in a | |
471 | flight recorder buffer (now named flight-channelname_X). | |
c8997124 | 472 | <p> |
c924c2c6 | 473 | The following lttctl commands take an hybrid trace : |
c8997124 | 474 | <p> |
c924c2c6 | 475 | Create trace channel, start lttd on normal channels, start tracing: |
c8997124 | 476 | <PRE> |
c924c2c6 | 477 | lttctl -C -w /tmp/trace2 -o channel.kernel.overwrite=1 trace2 |
c8997124 | 478 | </PRE> |
479 | <p> | |
c924c2c6 | 480 | Stop tracing, start lttd on flight recorder channels, destroy trace channels : |
c8997124 | 481 | <PRE> |
c924c2c6 | 482 | lttctl -D -w /tmp/trace2 trace2 |
c8997124 | 483 | </PRE> |
484 | <p> | |
c924c2c6 | 485 | Each "overwrite" channel is flight recorder channel. |
486 | ||
d58b406f | 487 | |
488 | <h3><a href="#TOCflight" name="flight">Tracing in flight recorder mode</a></h3> | |
c8997124 | 489 | <li>Flight recorder mode</li> |
c8997124 | 490 | <p> |
c924c2c6 | 491 | The flight recorder mode writes data into overwritten buffers for all channels, |
492 | including control channels, except for the facilities tracefiles. It consists of | |
493 | setting all channels to "overwrite". | |
c8997124 | 494 | <p> |
c924c2c6 | 495 | The following lttctl commands take a flight recorder trace : |
c8997124 | 496 | <PRE> |
c924c2c6 | 497 | lttctl -C -w /tmp/trace3 -o channel.all.overwrite=1 trace3 |
498 | ... | |
499 | lttctl -D -w /tmp/trace3 trace3 | |
c8997124 | 500 | </PRE> |
c924c2c6 | 501 | |
89aa576c | 502 | <hr /> |
503 | ||
504 | ||
505 | <h2><a href="#TOCsection3" name="section3">Adding new instrumentations with the | |
506 | markers</a></h2> | |
507 | <p> | |
c924c2c6 | 508 | |
47e2b195 | 509 | <h3><a href="#TOCkerneltp" name="kerneltp">Adding kernel |
510 | instrumentation</a></h3> | |
511 | ||
89aa576c | 512 | <p> |
47e2b195 | 513 | See <a |
514 | href="http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=blob;f=Documentation/markers.txt">Documentation/markers.txt</a> | |
515 | and <a | |
81654ff7 | 516 | href="http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=blob;f=Documentation/trace/tracepoints.txt">Documentation/trace/tracepoints.txt</a> in your kernel |
c924c2c6 | 517 | tree. |
47e2b195 | 518 | <p> |
519 | Also see <a | |
520 | href="http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=tree;f=ltt/probes">ltt/probes/</a> | |
521 | for LTTng probe examples. | |
522 | ||
523 | <h3><a href="#TOCusertp" name="usertp">Adding userspace instrumentation</a></h3> | |
c924c2c6 | 524 | |
305fd815 | 525 | Add new events to userspace programs with |
526 | <a href="http://ltt.polymtl.ca/packages/">userspace markers packages</a>. | |
c924c2c6 | 527 | Get the latest markers-userspace-*.tar.bz2 and see the Makefile and examples. It |
528 | allows inserting markers in executables and libraries, currently only on x86_32 | |
529 | and x86_64. | |
e01a1ce1 | 530 | See <a |
531 | href="http://ltt.polymtl.ca/packages/markers-userspace-0.5.tar.bz2">markers-userspace-0.5.tar.bz2</a> or more recent. | |
532 | ||
38b04cd7 | 533 | <p> |
e01a1ce1 | 534 | Note that a new design document for a 3rd generation of tracepoint/marker-based |
535 | userspace tracing is available at <a | |
536 | href="http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/ust.html">LTTng User-space Tracing | |
98dde887 | 537 | Design</a>. This new infrastructure is not yet implemented. |
38b04cd7 | 538 | |
539 | <p> | |
540 | The easy quick-and-dirty way to perform userspace tracing is currently to write | |
541 | an string to /mnt/debugfs/ltt/write_event. See <a | |
542 | href="#userspacetracing">Userspace tracing</a> in the | |
543 | installation for sources section of this document. | |
e01a1ce1 | 544 | |
89aa576c | 545 | <hr /> |
633bc4a3 | 546 | |
89aa576c | 547 | <h2><a href="#TOCsection4" name="section4">Creating Debian or RPM packages</a></h2> |
548 | <p> | |
633bc4a3 | 549 | |
98dde887 | 550 | <h3><a href="#TOCpkgdebian" name="pkgdebian">Create custom LTTV Debian packages</a></h3> |
633bc4a3 | 551 | |
89aa576c | 552 | <PRE> |
553 | Use : dpkg-buildpackage -rfakeroot | |
554 | </PRE> | |
555 | <p> | |
633bc4a3 | 556 | You should then have your LTTV .deb files created for your architecture. |
557 | ||
98dde887 | 558 | <h3><a href="#TOCpkglttng" name="pkglttng">Create custom LTTng packages</a></h3> |
89aa576c | 559 | <p> |
633bc4a3 | 560 | For building LTTng Debian packages : |
89aa576c | 561 | get the build tree with patches applies as explained in section 2. |
633bc4a3 | 562 | |
89aa576c | 563 | <PRE> |
633bc4a3 | 564 | make menuconfig (or xconfig or config) (customize your configuration) |
565 | make-kpkg kernel_image | |
89aa576c | 566 | </PRE> |
567 | <p> | |
633bc4a3 | 568 | You will then see your freshly created .deb in /usr/src. Install it with |
89aa576c | 569 | <PRE> |
633bc4a3 | 570 | dpkg -i /usr/src/(image-name).deb |
89aa576c | 571 | </PRE> |
572 | <p> | |
633bc4a3 | 573 | Then, follow the section "Editing the system wide configuration" in section 2. |
574 | ||
70a3fc43 | 575 | <hr /> |
633bc4a3 | 576 | |
c924c2c6 | 577 | </body> |
578 | </html> |