| 1 | |
| 2 | QUICKSTART |
| 3 | |
| 4 | How to use LTTng and LTTV in a few lines : |
| 5 | |
| 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 | |
| 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 | |
| 31 | |
| 32 | Author : Mathieu Desnoyers, September 2005 |
| 33 | |
| 34 | |
| 35 | |
| 36 | *********************************************************** |
| 37 | ** Section 1 * Installation from Debian or RPM packages ** |
| 38 | *********************************************************** |
| 39 | |
| 40 | No Debian or RPM packages are ready yet. |
| 41 | |
| 42 | TODO |
| 43 | |
| 44 | |
| 45 | *********************************************************** |
| 46 | ** Section 2 * Installation from sources ** |
| 47 | *********************************************************** |
| 48 | |
| 49 | * Prerequisites |
| 50 | |
| 51 | Tools needed to follow the package download steps : |
| 52 | |
| 53 | o wget |
| 54 | o bzip2 |
| 55 | o gzip |
| 56 | o tar |
| 57 | |
| 58 | You have to install the standard development librairies and programs necessary |
| 59 | to compile a kernel : |
| 60 | |
| 61 | (from Documentation/Changes in the Linux kernel tree) |
| 62 | o Gnu C 2.95.3 # gcc --version |
| 63 | o Gnu make 3.79.1 # make --version |
| 64 | o binutils 2.12 # ld -v |
| 65 | o util-linux 2.10o # fdformat --version |
| 66 | o module-init-tools 0.9.10 # depmod -V |
| 67 | |
| 68 | You might also want to have libncurses5 to have the text mode kernel |
| 69 | configuration menu, but there are alternatives. |
| 70 | |
| 71 | Prerequisites for LTTV 0.6.x installation are : |
| 72 | |
| 73 | gtk 2.4 or better development libraries (libgtk2.0, libgtk2.0-dev) |
| 74 | glib 2.4 or better development libraries (libglib2.0-0, libglib2.0-dev) |
| 75 | libpopt development libraries (libpopt0, libpopt-dev) |
| 76 | libpango development libraries (libpango1.0, libpango1.0-dev) |
| 77 | libc6 development librairies (libc6, libc6-dev) |
| 78 | |
| 79 | |
| 80 | * Getting the LTTng packages |
| 81 | |
| 82 | su - |
| 83 | mkdir /usr/src/lttng |
| 84 | cd /usr/src/lttng |
| 85 | (see http://ltt.polymtl.ca/lttng for package listing) |
| 86 | wget http://ltt.polymtl.ca/lttng/lttng-modules-0.2.tar.bz2 |
| 87 | wget http://ltt.polymtl.ca/lttng/patch-2.6.12-rc4-mm2-lttng-0.4.bz2 |
| 88 | bzip2 -cd lttng-modules-0.2.tar.bz2 | tar xvof - |
| 89 | |
| 90 | |
| 91 | * Getting LTTng kernel sources |
| 92 | |
| 93 | su - |
| 94 | cd /usr/src |
| 95 | wget http://kernel.org/pub/linux/kernel/v2.6/testing/linux-2.6.12-rc4.tar.bz2 |
| 96 | 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 |
| 97 | bzip2 -cd linux-2.6.12-rc4.tar.bz2 | tar xvof - |
| 98 | cd linux-2.6.12-rc4 |
| 99 | bzip2 -cd ../2.6.12-rc4-mm2.bz2 | patch -p1 |
| 100 | bzip2 -cd /usr/src/lttng/patch-2.6.12-rc4-mm2-lttng-0.4.bz2 | patch -p1 |
| 101 | cd .. |
| 102 | mv linux-2.6.12-rc4 linux-2.6.12-rc4-mm2-lttng-0.4 |
| 103 | |
| 104 | |
| 105 | * Installing a LTTng kernel |
| 106 | |
| 107 | su - |
| 108 | cd /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4 |
| 109 | make menuconfig (or make xconfig or make config) |
| 110 | Select the < Help > button if you are not familiar with kernel |
| 111 | configuration. |
| 112 | Items preceded by [*] means they has to be built into the kernel. |
| 113 | Items preceded by [M] means they has to be built as modules. |
| 114 | Items preceded by [ ] means they should be removed. |
| 115 | go to the "General setup" section |
| 116 | Select the following options : |
| 117 | [*] Linux Trace Toolkit Instrumentation Support |
| 118 | [M] or [*] Linux Trace Toolkit Tracer |
| 119 | do NOT activate (not ready yet) : |
| 120 | [ ] Align Linux Trace Toolkit Traces |
| 121 | [ ] Activate Linux Trace Toolkit Heartbeat Timer |
| 122 | IMPORTANT : This is enabled by default : you must disable it! |
| 123 | Select <Exit> |
| 124 | Select <Exit> |
| 125 | Select <Yes> |
| 126 | make |
| 127 | make install |
| 128 | make modules_install |
| 129 | |
| 130 | You must activate relayfs and specify a mount point. This is typically done in |
| 131 | fstab such that it happens at boot time. |
| 132 | |
| 133 | If you have never used RelayFS before, these operation would do this for you : |
| 134 | mkdir /mnt/relayfs |
| 135 | echo "relayfs /mnt/relayfs relayfs rw 0 0" \ |
| 136 | >> /etc/fstab |
| 137 | |
| 138 | reboot |
| 139 | |
| 140 | Select the Linux 2.6.12-rc4-mm2-lttng-0.4 kernel in your boot loader. |
| 141 | |
| 142 | |
| 143 | * Install the ltt-modules |
| 144 | |
| 145 | su - |
| 146 | cd /usr/src/lttng/lttng-modules-0.2 |
| 147 | KERNELDIR=/usr/src/linux-2.6.12-rc4-mm2-lttng-0.4 make |
| 148 | KERNELDIR=/usr/src/linux-2.6.12-rc4-mm2-lttng-0.4 make modules_install |
| 149 | |
| 150 | You need to load the ltt-control module to be able to control tracing from user |
| 151 | space. This is done by issuing the command : |
| 152 | modprobe ltt-control |
| 153 | |
| 154 | You can automate at boot time loading the ltt-control module by : |
| 155 | echo ltt-control >> /etc/modules |
| 156 | |
| 157 | |
| 158 | * Getting and installing the LTTV package |
| 159 | |
| 160 | su - |
| 161 | cd /usr/src |
| 162 | wget http://ltt.polymtl.ca/packages/LinuxTraceToolkitViewer-0.6.4-21092005.tar.gz |
| 163 | gzip -cd LinuxTraceToolkitViewer-0.6.4-21092005.tar.gz | tar xvof - |
| 164 | cd LinuxTraceToolkitViewer-0.6.4-21092005 |
| 165 | (refer to README to see the development libraries that must be installed on you |
| 166 | system) |
| 167 | ./configure |
| 168 | make |
| 169 | make install |
| 170 | |
| 171 | |
| 172 | |
| 173 | |
| 174 | *********************************************************** |
| 175 | ** Section 3 * Using LTTng and LTTV ** |
| 176 | *********************************************************** |
| 177 | |
| 178 | * Use graphical LTTV to control tracing and analyse traces |
| 179 | |
| 180 | lttv-gui (or /usr/local/bin/lttv-gui) |
| 181 | - Spot the "Tracing Control" icon : click on it |
| 182 | (it's a traffic light icon) |
| 183 | - enter the root password |
| 184 | - click "start" |
| 185 | - click "stop" |
| 186 | - Yes |
| 187 | * You should now see a trace |
| 188 | |
| 189 | * Use text mode LTTng to control tracing |
| 190 | |
| 191 | The tracing can be controlled from a terminal by using the lttctl command (as |
| 192 | root). |
| 193 | |
| 194 | Start tracing : |
| 195 | |
| 196 | lttctl -n trace -d -l /mnt/relayfs/ltt -t /tmp/trace |
| 197 | |
| 198 | Stop tracing and destroy trace channels : |
| 199 | |
| 200 | lttctl -n trace -R |
| 201 | |
| 202 | see lttctl --help for details. |
| 203 | |
| 204 | |
| 205 | * Use text mode LTTV |
| 206 | |
| 207 | Fell free to look in /usr/local/lib/lttv/plugins to see all the text and |
| 208 | graphical plugins available. |
| 209 | |
| 210 | For example, a simple trace dump in text format is available with : |
| 211 | |
| 212 | lttv -m textDump -t /tmp/trace |
| 213 | |
| 214 | see lttv -m textDump --help for detailed command line options of textDump. |
| 215 | |
| 216 | |
| 217 | |
| 218 | |
| 219 | *********************************************************** |
| 220 | ** Section 4 * Adding new instrumentations with genevent ** |
| 221 | *********************************************************** |
| 222 | |
| 223 | * Getting and installing genevent |
| 224 | |
| 225 | su - |
| 226 | cd /usr/src |
| 227 | wget http://ltt.polymtl.ca/packages/genevent-0.1.tar.gz |
| 228 | gzip -cd genevent-0.1.tar.gz | tar xvof - |
| 229 | cd genevent-0.1 |
| 230 | make |
| 231 | make install |
| 232 | |
| 233 | |
| 234 | * Add new events to the kernel with genevent |
| 235 | |
| 236 | su - |
| 237 | cd /usr/local/share/LinuxTraceToolkitViewer/facilities |
| 238 | cp process.xml yourfacility.xml |
| 239 | * edit yourfacility.xml to fit your needs. |
| 240 | cd /tmp |
| 241 | /usr/local/bin/genevent /usr/local/share/LinuxTraceToolkitViewer/yourfacility.xml |
| 242 | cp ltt-facility-yourfacility.h ltt-facility-id-yourfacility.h \ |
| 243 | /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4/include/linux/ltt |
| 244 | cp ltt-facility-loader-yourfacility.c ltt-facility-loader-yourfacility.h \ |
| 245 | /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4/ltt |
| 246 | * edit the kernel file you want to instrument |
| 247 | - Add #include <linux/ltt/ltt-facility-yourfacility.h> at the beginning |
| 248 | of the file. |
| 249 | - Add a call to the tracing functions. See their names and parameters in |
| 250 | /usr/src/linux-2.6.12-rc4-mm2-lttng-0.4/include/linux/ltt/ltt-facility-yourfacility.h |
| 251 | |
| 252 | |
| 253 | |