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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 0.4 tracer on a |
17 | linux 2.6.12-rc4-mm2 kernel. You will also find instructions for installtion of |
18 | LTTV 0.6.x : the Linux Trace Toolkit Viewer. |
19 | |
20 | At this point, the -mm tree of the kernel is used because it has RelayFS support |
21 | in it. In a nearby future, a vanilla kernel 2.6.14 will be used, as RelayFS has |
22 | been integrated in the linux 2.6.14-rc series. |
23 | |
24 | The following lttng patch is necessary to have the tracing hooks in the kernel. |
25 | The following ltt-control module controls the tracing. |
26 | |
27 | Required programs and librairies are assumed to be automatically installed in an |
28 | installation with Debian or RPM packages. In the case of an installation from |
29 | sources, the dependencies are listed. |
30 | |
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31 | |
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32 | Author : Mathieu Desnoyers, September 2005 |
33 | |
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34 | |
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35 | |
36 | *********************************************************** |
37 | ** Section 1 * Installation from Debian or RPM packages ** |
38 | *********************************************************** |
39 | |
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40 | No RPM packages are ready yet. |
41 | No Debian kernel LTTng patch is ready yet. |
42 | |
43 | You can use the ltt.polymtl.ca apt source to get LTTV for Debian : |
44 | |
45 | Add the following two sources to your /etc/apt/sources.list : |
46 | |
47 | deb http://ltt.polymtl.ca/packages/debian experimental main |
48 | deb-src http://ltt.polymtl.ca/packages/debian experimental main |
49 | |
50 | Then, perform the following : |
51 | |
52 | su - |
53 | apt-get update |
54 | apt-get install lttv lttv-doc |
55 | * note : the packages are signed by myself. I am not considered a trusted |
56 | Debian source yet, so warnings are normal. |
57 | |
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58 | Packages are only available for i386. If you want to create packages for other |
59 | platforms, do : |
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60 | |
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61 | apt-get source lttv |
62 | cd lttv-0.6.7 |
63 | dpkg-buildpackage -rfakeroot |
64 | |
65 | You should then have your .deb files created for your architecture. |
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66 | |
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67 | |
68 | |
69 | *********************************************************** |
70 | ** Section 2 * Installation from sources ** |
71 | *********************************************************** |
72 | |
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73 | * Prerequisites |
74 | |
75 | Tools needed to follow the package download steps : |
76 | |
77 | o wget |
78 | o bzip2 |
79 | o gzip |
80 | o tar |
81 | |
82 | You have to install the standard development librairies and programs necessary |
83 | to compile a kernel : |
84 | |
85 | (from Documentation/Changes in the Linux kernel tree) |
86 | o Gnu C 2.95.3 # gcc --version |
87 | o Gnu make 3.79.1 # make --version |
88 | o binutils 2.12 # ld -v |
89 | o util-linux 2.10o # fdformat --version |
90 | o module-init-tools 0.9.10 # depmod -V |
91 | |
92 | You might also want to have libncurses5 to have the text mode kernel |
93 | configuration menu, but there are alternatives. |
94 | |
95 | Prerequisites for LTTV 0.6.x installation are : |
96 | |
97 | gtk 2.4 or better development libraries (libgtk2.0, libgtk2.0-dev) |
98 | glib 2.4 or better development libraries (libglib2.0-0, libglib2.0-dev) |
99 | libpopt development libraries (libpopt0, libpopt-dev) |
100 | libpango development libraries (libpango1.0, libpango1.0-dev) |
101 | libc6 development librairies (libc6, libc6-dev) |
102 | |
103 | |
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104 | * Getting the LTTng packages |
105 | |
106 | su - |
107 | mkdir /usr/src/lttng |
108 | cd /usr/src/lttng |
109 | (see http://ltt.polymtl.ca/lttng for package listing) |
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110 | wget http://ltt.polymtl.ca/lttng/lttng-modules-0.3.tar.bz2 |
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111 | wget http://ltt.polymtl.ca/lttng/patch-2.6.12-rc4-mm2-lttng-0.4.bz2 |
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112 | bzip2 -cd lttng-modules-0.3.tar.bz2 | tar xvof - |
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113 | |
114 | |
115 | * Getting LTTng kernel sources |
116 | |
117 | su - |
118 | cd /usr/src |
119 | wget http://kernel.org/pub/linux/kernel/v2.6/testing/linux-2.6.12-rc4.tar.bz2 |
120 | wget http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.12-rc4/2.6.12-rc4-mm2/2.6.12-rc4-mm2.bz2 |
121 | bzip2 -cd linux-2.6.12-rc4.tar.bz2 | tar xvof - |
122 | cd linux-2.6.12-rc4 |
123 | bzip2 -cd ../2.6.12-rc4-mm2.bz2 | patch -p1 |
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124 | bzip2 -cd /usr/src/lttng/patch-2.6.12-rc4-mm2-lttng-0.4.bz2 | patch -p1 |
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125 | cd .. |
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126 | mv linux-2.6.12-rc4 linux-2.6.12-rc4-mm2-lttng-0.4 |
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127 | |
128 | |
129 | * Installing a LTTng kernel |
130 | |
131 | su - |
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132 | cd /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4 |
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133 | make menuconfig (or make xconfig or make config) |
134 | Select the < Help > button if you are not familiar with kernel |
135 | configuration. |
136 | Items preceded by [*] means they has to be built into the kernel. |
137 | Items preceded by [M] means they has to be built as modules. |
138 | Items preceded by [ ] means they should be removed. |
139 | go to the "General setup" section |
140 | Select the following options : |
141 | [*] Linux Trace Toolkit Instrumentation Support |
142 | [M] or [*] Linux Trace Toolkit Tracer |
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143 | It makes no difference for the rest of the procedure whether the Tracer |
144 | is compiled built-in or as a module. |
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145 | do NOT activate (not ready yet) : |
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146 | [ ] Align Linux Trace Toolkit Traces |
147 | [ ] Activate Linux Trace Toolkit Heartbeat Timer |
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148 | IMPORTANT : This is enabled by default : you must disable it! |
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149 | Select <Exit> |
150 | Select <Exit> |
151 | Select <Yes> |
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152 | make |
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153 | make modules_install |
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154 | make install |
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155 | |
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156 | You must activate relayfs and specify a mount point. This is typically done in |
157 | fstab such that it happens at boot time. |
158 | |
159 | If you have never used RelayFS before, these operation would do this for you : |
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160 | |
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161 | mkdir /mnt/relayfs |
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162 | cp /etc/fstab /etc/fstab.lttng.bkp |
163 | echo "relayfs /mnt/relayfs relayfs rw 0 0" >> /etc/fstab |
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164 | |
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165 | reboot |
166 | |
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167 | Select the Linux 2.6.12-rc4-mm2-lttng-0.4 kernel in your boot loader. |
168 | |
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169 | |
170 | * Install the ltt-modules |
171 | |
172 | su - |
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173 | cd /usr/src/lttng/lttng-modules-0.3 |
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174 | KERNELDIR=/usr/src/linux-2.6.12-rc4-mm2-lttng-0.4 make |
175 | KERNELDIR=/usr/src/linux-2.6.12-rc4-mm2-lttng-0.4 make modules_install |
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176 | |
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177 | You need to load the ltt-control module to be able to control tracing from user |
178 | space. This is done by issuing the command : |
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179 | |
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180 | modprobe ltt-control |
181 | |
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182 | You can automate at boot time loading the ltt-control module by : |
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183 | |
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184 | echo ltt-control >> /etc/modules |
185 | |
186 | |
187 | * Getting and installing the LTTV package |
188 | |
189 | su - |
190 | cd /usr/src |
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191 | wget http://ltt.polymtl.ca/packages/LinuxTraceToolkitViewer-0.6.5-21092005.tar.gz |
192 | gzip -cd LinuxTraceToolkitViewer-0.6.5-21092005.tar.gz | tar xvof - |
193 | cd LinuxTraceToolkitViewer-0.6.5-21092005 |
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194 | (refer to README to see the development libraries that must be installed on you |
195 | system) |
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196 | ./configure |
197 | make |
198 | make install |
199 | |
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200 | |
201 | |
202 | |
203 | *********************************************************** |
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204 | ** Section 3 * Using LTTng and LTTV ** |
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205 | *********************************************************** |
206 | |
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207 | * Use graphical LTTV to control tracing and analyse traces |
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208 | |
209 | lttv-gui (or /usr/local/bin/lttv-gui) |
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210 | - Spot the "Tracing Control" icon : click on it |
211 | (it's a traffic light icon) |
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212 | - enter the root password |
213 | - click "start" |
214 | - click "stop" |
215 | - Yes |
216 | * You should now see a trace |
217 | |
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218 | * Use text mode LTTng to control tracing |
219 | |
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220 | The tracing can be controlled from a terminal by using the lttctl command (as |
221 | root). |
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222 | |
223 | Start tracing : |
224 | |
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225 | lttctl -n trace -d -l /mnt/relayfs/ltt -t /tmp/trace |
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226 | |
227 | Stop tracing and destroy trace channels : |
228 | |
229 | lttctl -n trace -R |
230 | |
231 | see lttctl --help for details. |
232 | |
233 | |
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234 | * Use text mode LTTV |
235 | |
236 | Fell free to look in /usr/local/lib/lttv/plugins to see all the text and |
237 | graphical plugins available. |
238 | |
239 | For example, a simple trace dump in text format is available with : |
240 | |
241 | lttv -m textDump -t /tmp/trace |
242 | |
243 | see lttv -m textDump --help for detailed command line options of textDump. |
244 | |
245 | |
246 | |
247 | |
248 | *********************************************************** |
249 | ** Section 4 * Adding new instrumentations with genevent ** |
250 | *********************************************************** |
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251 | |
252 | * Getting and installing genevent |
253 | |
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254 | su - |
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255 | cd /usr/src |
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256 | wget http://ltt.polymtl.ca/packages/genevent-0.2.tar.gz |
257 | gzip -cd genevent-0.2.tar.gz | tar xvof - |
258 | cd genevent-0.2 |
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259 | make |
260 | make install |
261 | |
262 | |
263 | * Add new events to the kernel with genevent |
264 | |
265 | su - |
266 | cd /usr/local/share/LinuxTraceToolkitViewer/facilities |
267 | cp process.xml yourfacility.xml |
268 | * edit yourfacility.xml to fit your needs. |
269 | cd /tmp |
270 | /usr/local/bin/genevent /usr/local/share/LinuxTraceToolkitViewer/yourfacility.xml |
271 | cp ltt-facility-yourfacility.h ltt-facility-id-yourfacility.h \ |
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272 | /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4/include/linux/ltt |
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273 | cp ltt-facility-loader-yourfacility.c ltt-facility-loader-yourfacility.h \ |
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274 | /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4/ltt |
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275 | * edit the kernel file you want to instrument |
276 | - Add #include <linux/ltt/ltt-facility-yourfacility.h> at the beginning |
277 | of the file. |
278 | - Add a call to the tracing functions. See their names and parameters in |
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279 | /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4/include/linux/ltt/ltt-facility-yourfacility.h |
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280 | |
281 | |
282 | |