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1 | |
2 | QUICKSTART |
3 | |
4 | How to use LTTng and LTTV in a few lines : |
5 | |
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6 | This document is made of four parts : The first one explains how to install |
7 | LTTng and LTTV from Debian and RPM binary packages, the second one explains how |
8 | to install LTTng and LTTV from sources and the third one describes the steps |
9 | to follow to trace a system and view it. The fourth and last part explains |
10 | briefly how to add a new trace point to the kernel. |
11 | |
12 | What you will typically want is to read sections 1 and 3 : install LTTng from |
13 | binary packages and use it. If there are no packages ready for your system, you |
14 | will have to install from sources (section 2) instead. |
15 | |
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16 | These operations are made for installing the LTTng 0.5.X tracer on a |
17 | linux 2.6.X kernel. You will also find instructions for installation of |
18 | LTTV 0.8.x : the Linux Trace Toolkit Viewer. |
19 | |
20 | To see the list of compatibilities between LTTng, ltt-control, LTTV, genevent |
21 | and lttng-modules, please refer to : |
22 | http://ltt.polymtl.ca > LTTng+LTTV versions compatibility |
23 | |
24 | |
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25 | |
26 | The following lttng patch is necessary to have the tracing hooks in the kernel. |
27 | The following ltt-control module controls the tracing. |
28 | |
29 | Required programs and librairies are assumed to be automatically installed in an |
30 | installation with Debian or RPM packages. In the case of an installation from |
31 | sources, the dependencies are listed. |
32 | |
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33 | |
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34 | ** Current development status ** |
35 | |
36 | LTTng : |
37 | supported architectures : |
38 | Intel Pentium (UP/SMP) with TSC |
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39 | PowerPC 32 and 64 bits |
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40 | ARM |
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41 | C2 Microsystems (variant of MIPS) |
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42 | |
43 | LTTV : |
44 | supported architectures : |
45 | Intel i386 and better |
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46 | Intel 64 bits |
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47 | PowerPC 32 and 64 bits |
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48 | |
49 | |
50 | |
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51 | Author : Mathieu Desnoyers, September 2005 |
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52 | Last update : May 23, 2006 |
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53 | |
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54 | |
55 | *********************************************************** |
56 | ** Section 1 * Installation from Debian or RPM packages ** |
57 | *********************************************************** |
58 | |
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59 | ** NOTE : RPM and debian packages are only made once a version has been |
60 | thoroughly tested. If they do not exist at the moment, please install from |
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61 | sources (see section 2 below). To see the list of compatibilities between |
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62 | LTTng, ltt-control, LTTV, genevent and lttng-modules, please refer to |
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63 | http://ltt.polymtl.ca > LTTng+LTTV versions compatibility |
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64 | |
65 | |
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66 | * Install from RPM packages on Fedora Core 4 : |
67 | |
68 | Get LTTV RPM from : |
69 | |
70 | http://ltt.polymtl.ca/packages/fedora/RPMS |
71 | |
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72 | LTTV RPM are ready. |
73 | |
74 | LTTng kernel and lttng-modules RPM are available for some architectures (i586, |
75 | i686). Feel free to help fix the spec files to have correct lttng-modules RPM |
76 | package. |
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77 | |
78 | |
79 | * Install from Deb packages on Debian : |
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80 | |
81 | You can use the ltt.polymtl.ca apt source to get LTTV for Debian : |
82 | |
83 | Add the following two sources to your /etc/apt/sources.list : |
84 | |
85 | deb http://ltt.polymtl.ca/packages/debian experimental main |
86 | deb-src http://ltt.polymtl.ca/packages/debian experimental main |
87 | |
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88 | |
89 | * Install from precompiled binary packages (LTTV compiled only for i386, and |
90 | LTTng only for i686 smp), perform the following : |
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91 | |
92 | su - |
93 | apt-get update |
94 | apt-get install lttv lttv-doc |
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95 | apt-get install kernel-image-2.6.12-rc4-mm2-lttng-0.4.2 |
96 | apt-get install lttng-modules-modules-2.6.12-rc4-mm2-lttng-0.4.2 |
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97 | * note : the packages are signed by myself. I am not considered a trusted |
98 | Debian source yet, so warnings are normal. |
99 | |
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100 | Then, follow the section "Editing the system wide configuration" in section 2. |
101 | |
102 | * Create custom LTTV Debian packages |
103 | |
104 | Binary packages are only available for i386. If you want to create your own LTTV |
105 | packages for other platforms, do : |
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106 | |
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107 | su - |
108 | cd /usr/src |
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109 | apt-get source lttv |
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110 | cd lttv-0.6.9 |
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111 | dpkg-buildpackage -rfakeroot |
112 | |
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113 | You should then have your LTTV .deb files created for your architecture. |
114 | |
115 | * Create custom LTTng packages |
116 | |
117 | For building LTTng Debian packages : |
118 | |
119 | su - |
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120 | apt-get install kernel-source-2.6.12-rc4-mm2-lttng-0.4.2 |
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121 | cd /usr/src |
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122 | bzip2 -cd kernel-source-2.6.12-rc4-mm2-lttng-0.4.2.tar.bz2 | tar xvof - |
123 | cd kernel-source-2.6.12-rc4-mm2-lttng-0.4.2 |
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124 | make menuconfig (or xconfig or config) (customize your configuration) |
125 | make-kpkg kernel_image |
126 | |
127 | You will then see your freshly created .deb in /usr/src. Install it with |
128 | dpkg -i /usr/src/(image-name).deb |
129 | |
130 | You will also need to create a package for the lttng-modules : |
131 | |
132 | su - |
133 | cd /usr/src |
134 | apt-get source lttng-modules |
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135 | cd kernel-source-2.6.12-rc4-mm2-lttng-0.4.2 |
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136 | make-kpkg --added_modules /usr/src/lttng-modules-0.3 modules_image |
137 | |
138 | You will then see your freshly created .deb in /usr/src. Install it with |
139 | dpkg -i /usr/src/lttng-modules-modules-(your version).deb |
140 | |
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141 | |
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142 | Then, follow the section "Editing the system wide configuration" in section 2. |
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143 | |
144 | |
145 | *********************************************************** |
146 | ** Section 2 * Installation from sources ** |
147 | *********************************************************** |
148 | |
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149 | * Prerequisites |
150 | |
151 | Tools needed to follow the package download steps : |
152 | |
153 | o wget |
154 | o bzip2 |
155 | o gzip |
156 | o tar |
157 | |
158 | You have to install the standard development librairies and programs necessary |
159 | to compile a kernel : |
160 | |
161 | (from Documentation/Changes in the Linux kernel tree) |
162 | o Gnu C 2.95.3 # gcc --version |
163 | o Gnu make 3.79.1 # make --version |
164 | o binutils 2.12 # ld -v |
165 | o util-linux 2.10o # fdformat --version |
166 | o module-init-tools 0.9.10 # depmod -V |
167 | |
168 | You might also want to have libncurses5 to have the text mode kernel |
169 | configuration menu, but there are alternatives. |
170 | |
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171 | Prerequisites for LTTV 0.x.x installation are : |
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172 | |
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173 | gcc 3.2 or better |
174 | gtk 2.4 or better development libraries |
175 | (Debian : libgtk2.0, libgtk2.0-dev) |
176 | (Fedora : gtk2, gtk2-devel) |
177 | note : For Fedora users : this might require at least core 3 from Fedora, |
178 | or you might have to compile your own GTK2 library. |
179 | glib 2.4 or better development libraries |
180 | (Debian : libglib2.0-0, libglib2.0-dev) |
181 | (Fedora : glib2, glib2-devel) |
182 | libpopt development libraries |
183 | (Debian : libpopt0, libpopt-dev) |
184 | (Fedora : popt) |
185 | libpango development libraries |
186 | (Debian : libpango1.0, libpango1.0-dev) |
187 | (Fedora : pango, pango-devel) |
188 | libc6 development librairies |
189 | (Debian : libc6, libc6-dev) |
190 | (Fedora : glibc, glibc) |
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191 | |
192 | |
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193 | * Getting the LTTng packages |
194 | |
195 | su - |
196 | mkdir /usr/src/lttng |
197 | cd /usr/src/lttng |
198 | (see http://ltt.polymtl.ca/lttng for package listing) |
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199 | wget http://ltt.polymtl.ca/lttng/patch-2.6.16-lttng-0.x.xx.tar.bz2 |
200 | bzip2 -cd patch-2.6.16-lttng-0.x.xx.tar.bz2 | tar xvof - |
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201 | |
202 | |
203 | * Getting LTTng kernel sources |
204 | |
205 | su - |
206 | cd /usr/src |
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207 | wget http://kernel.org/pub/linux/kernel/v2.6/testing/linux-2.6.16.tar.bz2 |
208 | bzip2 -cd linux-2.6.16.tar.bz2 | tar xvof - |
209 | cd linux-2.6.16 |
210 | cat /usr/src/lttng/patch-2.6.16-lttng-0.x.xx* | patch -p1 |
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211 | cd .. |
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212 | mv linux-2.6.16 linux-2.6.16-lttng-0.x.xx |
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213 | |
214 | |
215 | * Installing a LTTng kernel |
216 | |
217 | su - |
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218 | cd /usr/src/linux-2.6.16-lttng-0.x.xx |
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219 | make menuconfig (or make xconfig or make config) |
220 | Select the < Help > button if you are not familiar with kernel |
221 | configuration. |
222 | Items preceded by [*] means they has to be built into the kernel. |
223 | Items preceded by [M] means they has to be built as modules. |
224 | Items preceded by [ ] means they should be removed. |
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225 | go to the "Instrumentation Support" section |
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226 | Select the following options : |
227 | [*] Linux Trace Toolkit Instrumentation Support |
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228 | <M> or <*> Linux Trace Toolkit Tracer |
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229 | It makes no difference for the rest of the procedure whether the Tracer |
230 | is compiled built-in or as a module. |
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231 | activate : |
232 | [*] Align Linux Trace Toolkit Traces |
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233 | [*] Allow tracing from userspace |
234 | your choice (see < Help >) : |
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235 | [ ] Activate Linux Trace Toolkit Heartbeat Timer |
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236 | You may or may not activate instrumentation per facility. They are all |
237 | selected for logging by default. It can be used as a compile time filter to |
238 | enable/disable logging of events. It is useful to discard events with a |
239 | minimal impact on the system and especially useful for now, as the dynamic |
240 | filter has not been implemented yet. |
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241 | Select <Exit> |
242 | Select <Exit> |
243 | Select <Yes> |
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244 | make |
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245 | make modules_install |
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246 | make install |
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247 | |
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248 | reboot |
249 | |
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250 | Select the Linux 2.6.16-lttng-0.x.xx kernel in your boot loader. |
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251 | |
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252 | |
253 | * Editing the system wide configuration |
254 | |
255 | You must activate relayfs and specify a mount point. This is typically done in |
256 | fstab such that it happens at boot time. |
257 | |
258 | If you have never used RelayFS before, these operation would do this for you : |
259 | |
260 | mkdir /mnt/relayfs |
261 | cp /etc/fstab /etc/fstab.lttng.bkp |
262 | echo "relayfs /mnt/relayfs relayfs rw 0 0" >> /etc/fstab |
263 | |
264 | then, rebooting or issuing the following command will activate relayfs : |
265 | |
266 | mount /mnt/relayfs |
267 | |
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268 | You need to load the ltt-control module to be able to control tracing from user |
269 | space. This is done by issuing the command : |
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270 | |
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271 | modprobe ltt-control |
272 | |
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273 | If you want to have complete information about the kernel state (including all |
274 | the process names), you need to load the ltt-statedump module. This is done by |
275 | issuing the command : |
276 | |
277 | modprobe ltt-statedump |
278 | |
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279 | You can automate at boot time loading the ltt-control module by : |
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280 | |
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281 | echo ltt-control >> /etc/modules |
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282 | echo ltt-statedump >> /etc/modules |
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283 | |
284 | |
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285 | * Getting and installing the ltt-control package (on the traced machine) |
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286 | (note : the ltt-control package contains lttd and lttctl. Although it has the |
287 | same name as the ltt-control kernel module, they are *not* the same thing.) |
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288 | su - |
289 | cd /usr/src |
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290 | wget http://ltt.polymtl.ca/lttng/ltt-control-0.x-xxxx2006.tar.gz |
291 | gzip -cd ltt-control-0.x-xxxx2006.tar.gz | tar xvof - |
292 | cd ltt-control-0.x-xxxx2006 |
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293 | (refer to README to see the development libraries that must be installed on you |
294 | system) |
295 | ./configure |
296 | make |
297 | make install |
298 | |
299 | |
300 | * Getting and installing the LTTV package (on the visualisation machine, same or |
301 | different from the visualisation machine) |
302 | |
303 | su - |
304 | cd /usr/src |
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305 | wget http://ltt.polymtl.ca/packages/LinuxTraceToolkitViewer-0.x.xx-xxxx2006.tar.gz |
306 | gzip -cd LinuxTraceToolkitViewer-0.x.xx-xxxx2006.tar.gz | tar xvof - |
307 | cd LinuxTraceToolkitViewer-0.x.xx-xxxx2006 |
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308 | (refer to README to see the development libraries that must be installed on you |
309 | system) |
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310 | ./configure |
311 | make |
312 | make install |
313 | |
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314 | |
315 | |
316 | |
317 | *********************************************************** |
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318 | ** Section 3 * Using LTTng and LTTV ** |
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319 | *********************************************************** |
320 | |
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321 | * Use graphical LTTV to control tracing and analyse traces |
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322 | |
323 | lttv-gui (or /usr/local/bin/lttv-gui) |
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324 | - Spot the "Tracing Control" icon : click on it |
325 | (it's a traffic light icon) |
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326 | - enter the root password |
327 | - click "start" |
328 | - click "stop" |
329 | - Yes |
330 | * You should now see a trace |
331 | |
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332 | * Use text mode LTTng to control tracing |
333 | |
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334 | The tracing can be controlled from a terminal by using the lttctl command (as |
335 | root). |
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336 | |
337 | Start tracing : |
338 | |
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339 | lttctl -n trace -d -l /mnt/relayfs/ltt -t /tmp/trace |
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340 | |
341 | Stop tracing and destroy trace channels : |
342 | |
343 | lttctl -n trace -R |
344 | |
345 | see lttctl --help for details. |
346 | |
347 | |
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348 | * Use text mode LTTV |
349 | |
350 | Fell free to look in /usr/local/lib/lttv/plugins to see all the text and |
351 | graphical plugins available. |
352 | |
353 | For example, a simple trace dump in text format is available with : |
354 | |
355 | lttv -m textDump -t /tmp/trace |
356 | |
357 | see lttv -m textDump --help for detailed command line options of textDump. |
358 | |
359 | |
360 | |
361 | |
362 | *********************************************************** |
363 | ** Section 4 * Adding new instrumentations with genevent ** |
364 | *********************************************************** |
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365 | |
366 | * Getting and installing genevent |
367 | |
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368 | su - |
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369 | cd /usr/src |
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370 | wget http://ltt.polymtl.ca/packages/genevent-0.xx.tar.gz |
371 | gzip -cd genevent-0.xx.tar.gz | tar xvof - |
372 | cd genevent-0.xx |
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373 | make |
374 | make install |
375 | |
376 | |
377 | * Add new events to the kernel with genevent |
378 | |
379 | su - |
380 | cd /usr/local/share/LinuxTraceToolkitViewer/facilities |
381 | cp process.xml yourfacility.xml |
382 | * edit yourfacility.xml to fit your needs. |
383 | cd /tmp |
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384 | /usr/local/bin/genevent /usr/local/share/LinuxTraceToolkitViewer/facilities/yourfacility.xml |
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385 | cp ltt-facility-yourfacility.h ltt-facility-id-yourfacility.h \ |
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386 | /usr/src/linux-2.6.16-lttng-0.x.xx8/include/linux/ltt |
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387 | cp ltt-facility-loader-yourfacility.c ltt-facility-loader-yourfacility.h \ |
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388 | /usr/src/linux-2.6.16-lttng-0.x.xx/ltt |
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389 | * edit the kernel file you want to instrument |
390 | - Add #include <linux/ltt/ltt-facility-yourfacility.h> at the beginning |
391 | of the file. |
392 | - Add a call to the tracing functions. See their names and parameters in |
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393 | /usr/src/linux-2.6.16-lttng-0.x.xx/include/linux/ltt/ltt-facility-yourfacility.h |
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394 | |
395 | |
396 | |