LTTngManual.html

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   4   <title>Linux Trace Toolkit Next Generation Manual</title>
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   7
   8 <h1>Linux Trace Toolkit Next Generation Manual</h1>
   9
  10 Author : Mathieu Desnoyers, September 2005<br>
  11 Last update : January 30, 2010<br>
  12 (originally known as the LTTng QUICKSTART guide)
  13
  14 <h2>Table of Contents</h2>
  15
  16 <ul>
  17 <li><a href="#intro" name="TOCintro">Introduction</a></li>
  18 <ul>
  19 <li><a href="#licenses" name="TOClicenses">Licenses</a></li>
  20 <ul>
  21 <li><a href="#arch" name="TOCarch">Supported architectures</a></li>
  22 </ul>
  23
  24 <li><a href="#section1" name="TOCsection1">Installing LTTng and LTTV from
  25 sources</a></li>
  26 <ul>
  27 <li><a href="#prerequisites" name="TOCprerequisites">Prerequisistes</li>
  28 <li><a href="#getlttng" name="TOCgetlttng">Getting the LTTng packages</li>
  29 <li><a href="#getlttngsrc" name="TOCgetlttngsrc">Getting the LTTng kernel sources</li>
  30 <li><a href="#installlttng" name="TOCinstalllttng">Installing a LTTng kernel</li>
  31 <li><a href="#editconfig" name="TOCeditconfig">Editing the system wide
  32 configuration</a>
  33 <li><a href="#getlttctl" name="TOCgetlttctl">Getting and installing the
  34 ltt-control package</li>
  35 <li><a href="#userspacetracing" name="TOCuserspacetracing">Userspace Tracing</li>
  36 <li><a href="#getlttv" name="TOCgetlttv">Getting and installing the LTTV package</ul>
  37
  38 <li><a href="#section2" name="TOCsection2">Using LTTng and LTTV</a></li>
  39 <ul>
  40 <li><a href="#uselttvgui" name="TOCuselttvgui">Use graphical LTTV to control
  41 tracing and analyse traces</a></li>
  42 <li><a href="#uselttngtext" name="TOCuselttngtext">Use text mode LTTng to
  43 control tracing</a></li>
  44 <li><a href="#uselttvtext" name="TOCuselttvtext">Use text mode LTTV</a></li>
  45 <li><a href="#hybrid" name="TOChybrid">Tracing in "Hybrid" mode</a></li>
  46 <li><a href="#flight" name="TOCflight">Tracing in flight recorder mode</a></li>
  47 </ul>
  48
  49 <li><a href="#section3" name="TOCsection3">Adding kernel and user-space
  50 instrumentation</a>
  51 <ul>
  52 <li><a href="#kerneltp" name="TOCkerneltp">Adding kernel instrumentation</a></li>
  53 <li><a href="#usertp" name="TOCusertp">Adding userspace instrumentation</a></li>
  54 </ul>
  55
  56 <li><a href="#section4" name="TOCsection4">Creating Debian and RPM packages
  57 from LTTV</a></li>
  58 <ul>
  59 <li><a href="#pkgdebian" name="TOCpkgdebian">Create custom LTTV Debian
  60 <li><a href="#pkglttng" name="TOCpkglttng">Create custom LTTng packages</a></li>
  61 </ul>
  62
  63 </ul>
  64
  65 <hr />
  66
  67 <h2><a href="#TOCintro" name="intro">Introduction</a></h2>
  68 <p>
  69 This document is made of five parts : the first one explains how
  70 to install LTTng and LTTV from sources, the second one describes the steps
  71 to follow to trace a system and view it. The third part explains
  72 briefly how to add a new trace point to the kernel and to user space
  73 applications. The fourth and last part explains how to create Debian or RPM
  74 packages from the LTTng and LTTV sources.
  75 <p>
  76 These operations are made for installing the LTTng 0.86 tracer on a linux 2.6.X
  77 kernel. You will also find instructions for installation of LTTV 0.12.x : the
  78 Linux Trace Toolkit Viewer.
  79 To see the list of compatibilities between LTTng, ltt-control, LTTV, please
  80 refer to :
  81 <a
  82 href="http://lttng.org/cgi-bin/gitweb.cgi?p=lttv.git;a=blob_plain;f=doc/developer/lttng-lttv-compatibility.html;hb=HEAD">LTTng+LTTV versions compatibility</a>
  83
  84 The ongoing work had the Linux Kernel Markers integrated in the mainline Linux
  85 kernel since Linux 2.6.24 and the Tracepoints since 2.6.28. In its current
  86 state, the lttng patchset is necessary to have the trace clocksource, the
  87 instrumentation and the LTTng high-speed data extraction mechanism added to the
  88 kernel.
  89
  90 <br>
  91 <br>
  92 <h3><a href="#TOClicenses" name="licenses">Licenses</a></h3>
  93 <p>
  94 LTTng, UST and LTTV are developed by an open community. LTTng is released under
  95 a dual Gnu LGPLv2.1/GPLv2 license, except for very few kernel-specific files
  96 which are derived work from the Linux kernel.
  97 <p>
  98 LTTV is available under the Gnu GPLv2. The low-level LTTV trace reading library
  99 is released under Gnu LGPLv2.1.
 100 <p>
 101 The Eclipse LTTng trace analysis tool is released under the EPL and uses the
 102 LTTV trace reading library (LGPLv2.1).
 103 <p>
 104 The UST (Userspace Tracing) and the Userspace RCU libraries are released under
 105 the LGPLv2.1 license, which allows linking with non-GPL (BSD, proprietary...)
 106 applications. The associated headers are released under MIT-style/BSD-style
 107 licenses.
 108 <p>
 109 Please refer to each particular file licensing for details.
 110
 111 <h3><a href="#TOCarch" name="arch">Supported architectures</a></h3>
 112 LTTng :<br>
 113 <br>
 114 <li> x86 32/64 bits
 115 <li> PowerPC 32 and 64 bits
 116 <li> ARMv7 OMAP3
 117 <li> Other ARM (with limited timestamping precision, e.g. 1HZ. Need
 118 architecture-specific support for better precision)
 119 <li> MIPS
 120 <li> sh (partial architecture-specific instrumentation)
 121 <li> sparc64 (partial architecture-specific instrumentation)
 122 <li> s390 (partial architecture-specific instrumentation)
 123 <li> Other architectures supported without architecture-specific instrumentation
 124 and with low-resolution timestamps.<br>
 125 <br>
 126 <br>
 127 LTTV :<br>
 128 <br>
 129 <li> Intel 32/64 bits
 130 <li> PowerPC 32 and 64 bits
 131 <li> Possibly others. Takes care of endianness and type size difference between
 132 the LTTng traces and the LTTV analysis tool.
 133
 134 <hr />
 135
 136
 137 <h2><a href="#TOCsection1" name="section1">Installation from sources</a></h2>
 138 <p>
 139
 140 <h3><a href="#TOCprerequisites" name="prerequisites">Prerequisites</a></h3>
 141 <ul>
 142 <p>
 143 Tools needed to follow the package download steps :
 144
 145 <li>wget
 146 <li>bzip2
 147 <li>gzip
 148 <li>tar
 149
 150 <p>
 151 You have to install the standard development libraries and programs necessary
 152 to compile a kernel :
 153
 154 <PRE>
 155 (from Documentation/Changes in the Linux kernel tree)
 156 Gnu C                2.95.3                # gcc --version
 157 Gnu make             3.79.1                # make --version
 158 binutils             2.12                  # ld -v
 159 util-linux           2.10o                 # fdformat --version
 160 module-init-tools    0.9.10                # depmod -V
 161 </PRE>
 162
 163 <p>
 164 You might also want to have libncurses5 to have the text mode kernel
 165 configuration menu, but there are alternatives.
 166
 167 <p>
 168 Prerequisites for LTTV 0.x.x installation are :
 169
 170 <PRE>
 171 gcc 3.2 or better
 172 gtk 2.4 or better development libraries
 173   (Debian : libgtk2.0, libgtk2.0-dev)
 174   (Fedora : gtk2, gtk2-devel)
 175   note : For Fedora users : this might require at least core 3 from Fedora,
 176   or you might have to compile your own GTK2 library.
 177 glib 2.16 or better development libraries
 178   (Debian : libglib2.0-0, libglib2.0-dev)
 179   (Fedora : glib2, glib2-devel)
 180 libpopt development libraries
 181   (Debian : libpopt0, libpopt-dev)
 182   (Fedora : popt)
 183 libpango development libraries
 184   (Debian : libpango1.0, libpango1.0-dev)
 185   (Fedora : pango, pango-devel)
 186 libc6 development librairies
 187   (Debian : libc6, libc6-dev)
 188   (Fedora : glibc, glibc)
 189 </PRE>
 190 </ul>
 191
 192 <li>Reminder</li>
 193
 194 <p>
 195 See the list of compatibilities between LTTng, ltt-control and LTTV at :
 196 <a
 197 href="http://lttng.org/cgi-bin/gitweb.cgi?p=lttv.git;a=blob_plain;f=doc/developer/lttng-lttv-compatibility.html;hb=HEAD">LTTng+LTTV versions compatibility</a>.
 198
 199
 200 <h3><a href="#TOCgetlttng" name="getlttng">Getting the LTTng packages</a></h3>
 201
 202 <PRE>
 203 su -
 204 mkdir /usr/src/lttng
 205 cd /usr/src/lttng
 206 (see http://ltt.polymtl.ca/lttng for package listing)
 207 wget http://ltt.polymtl.ca/lttng/patch-2.6.X-lttng-0.x.xx.tar.bz2
 208 bzip2 -cd patch-2.6.X-lttng-0.x.xx.tar.bz2 | tar xvof -
 209 </PRE>
 210
 211
 212 <h3><a href="#TOCgetlttngsrc" name="getlttngsrc">Getting LTTng kernel sources</a></h3>
 213
 214 <PRE>
 215 su -
 216 cd /usr/src
 217 wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.X.tar.bz2
 218 bzip2 -cd linux-2.6.X.tar.bz2 | tar xvof -
 219 cd linux-2.6.X
 220 - For LTTng 0.9.4- cat /usr/src/lttng/patch*-2.6.X-lttng-0.x.xx* | patch -p1
 221 - For LTTng 0.9.5+ apply the patches in the order specified in the series file,
 222   or use quilt
 223 cd ..
 224 mv linux-2.6.X linux-2.6.X-lttng-0.x.xx
 225 </PRE>
 226
 227
 228 <h3><a href="#TOCinstalllttng" name="installlttng">Installing a LTTng kernel</a></h3>
 229
 230 <PRE>
 231 su -
 232 cd /usr/src/linux-2.6.X-lttng-0.x.xx
 233 make menuconfig (or make xconfig or make config)
 234     Select the &lt; Help &gt; button if you are not familiar with kernel
 235     configuration.
 236     Items preceded by [*] means they has to be built into the kernel.
 237     Items preceded by [M] means they has to be built as modules.
 238     Items preceded by [ ] means they should be removed.
 239   go to the "General setup" section
 240     Select the following options :
 241     [*] Prompt for development and/or incomplete code/drivers
 242     [*] Activate markers
 243     [*] Activate userspace markers ABI (experimental, optional)
 244     [*] Immediate value optimization (optional)
 245     [*] Linux Trace Toolkit Next Generation (LTTng) ---&gt;
 246     &lt;M&gt; or &lt;*&gt; Compile lttng tracing probes
 247     &lt;M&gt; or &lt;*&gt; Linux Trace Toolkit High-speed Lockless Data Relay
 248     &lt;M&gt; or &lt;*&gt; Linux Trace Toolkit Lock-Protected Data Relay
 249     &lt;M&gt; or &lt;*&gt; Linux Trace Toolkit Serializer
 250     &lt;M&gt; or &lt;*&gt;   Linux Trace Toolkit Marker Control
 251     &lt;M&gt; or &lt;*&gt;     Linux Trace Toolkit Tracer
 252     [*] Align Linux Trace Toolkit Traces
 253     &lt;M&gt; or &lt;*&gt; Support logging events from userspace
 254     [*] Support trace extraction from crash dump
 255     &lt;M&gt; or &lt;*&gt; Linux Trace Toolkit Trace Controller
 256     &lt;M&gt; or &lt;*&gt; Linux Trace Toolkit State Dump
 257   Select &lt;Exit&gt;
 258   Select &lt;Exit&gt;
 259   Select &lt;Yes&gt;
 260 make
 261 make modules_install
 262 (if necessary, create a initrd with mkinitrd or your preferate alternative)
 263 (mkinitrd -o /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx)
 264
 265 -- on X86, X86_64
 266 make install
 267 reboot
 268 Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader.
 269
 270 -- on PowerPC
 271 cp vmlinux.strip /boot/vmlinux-2.6.X-lttng-0.x.xx
 272 cp System.map /boot/System.map-2.6.X-lttng-0.x.xx
 273 cp .config /boot/config-2.6.X-lttng-0.x.xx
 274 depmod -ae -F /boot/System.map-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx
 275 mkinitrd /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx
 276 (edit /etc/yaboot.conf to add a new entry pointing to your kernel : the entry
 277 that comes first is the default kernel)
 278 ybin
 279 select the right entry at the yaboot prompt (see choices : tab, select : type
 280 the kernel name followed by enter)
 281 Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader.
 282 --
 283 </PRE>
 284
 285 <h3><a href="#TOCeditconfig" name="editconfig">Editing the system wide
 286 configuration</a></h3>
 287
 288 <p>
 289 You must activate debugfs and specify a mount point. This is typically done in
 290 fstab such that it happens at boot time.  If you have never used DebugFS before,
 291 these operation would do this for you :
 292
 293 <PRE>
 294 mkdir /mnt/debugfs
 295 cp /etc/fstab /etc/fstab.lttng.bkp
 296 echo "debugfs         /mnt/debugfs    debugfs rw              0       0"  >> /etc/fstab
 297 </PRE>
 298
 299 <p>
 300 then, rebooting or issuing the following command will activate debugfs :
 301 <PRE>
 302 mount /mnt/debugfs
 303 </PRE>
 304
 305 <p>
 306 You need to load the LTT modules to be able to control tracing from user
 307 space. This is done by issuing the following commands. Note however
 308 these commands load all LTT modules. Depending on what options you chose to
 309 compile statically, you may not need to issue all these commands.
 310
 311 <PRE>
 312 modprobe ltt-trace-control
 313 modprobe ltt-marker-control
 314 modprobe ltt-tracer
 315 modprobe ltt-serialize
 316 modprobe ltt-relay
 317 modprobe ipc-trace
 318 modprobe kernel-trace
 319 modprobe mm-trace
 320 modprobe net-trace
 321 modprobe fs-trace
 322 modprobe jbd2-trace
 323 modprobe ext4-trace
 324 modprobe syscall-trace
 325 modprobe trap-trace
 326 modprobe block-trace
 327 #if locking tracing is wanted, uncomment the following
 328 #modprobe lockdep-trace
 329 </PRE>
 330
 331 <p>
 332 If you want to have complete information about the kernel state (including all
 333 the process names), you need to load the ltt-statedump module. This is done by
 334 issuing the command :
 335
 336 <PRE>
 337 modprobe ltt-statedump
 338 </PRE>
 339 <p>
 340 You can automate at boot time loading the ltt-control module by :
 341
 342 <PRE>
 343 cp /etc/modules /etc/modules.bkp
 344 echo ltt-trace-control >> /etc/modules
 345 echo ltt-marker-control >> /etc/modules
 346 echo ltt-tracer >> /etc/modules
 347 echo ltt-serialize >> /etc/modules
 348 echo ltt-relay >> /etc/modules
 349 echo ipc-trace >> /etc/modules
 350 echo kernel-trace >> /etc/modules
 351 echo mm-trace >> /etc/modules
 352 echo net-trace >> /etc/modules
 353 echo fs-trace >> /etc/modules
 354 echo jbd2-trace >> /etc/modules
 355 echo ext4-trace >> /etc/modules
 356 echo syscall-trace >> /etc/modules
 357 echo trap-trace >> /etc/modules
 358 #if locking tracing is wanted, uncomment the following
 359 #echo lockdep-trace >> /etc/modules
 360 </PRE>
 361
 362
 363 <h3><a href="#TOCgetlttctl" name="getlttctl">Getting and installing the
 364 ltt-control package (on the traced machine)</a></h3>
 365 <p>
 366 (note : the ltt-control package contains lttd and lttctl. Although it has the
 367 same name as the ltt-control kernel module, they are *not* the same thing.)
 368
 369 <PRE>
 370 su -
 371 cd /usr/src
 372 wget http://ltt.polymtl.ca/lttng/ltt-control-0.x-xxxx2006.tar.gz
 373 gzip -cd ltt-control-0.x-xxxx2008.tar.gz | tar xvof -
 374 cd ltt-control-0.x-xxxx2006
 375 (refer to README to see the development libraries that must be installed on you
 376 system)
 377 ./configure
 378 make
 379 make install
 380 # (run ldconfig to ensure new shared objects are taken into account)
 381 ldconfig
 382 </PRE>
 383
 384 <h3><a href="#TOCuserspacetracing" name="userspacetracing">Userspace tracing</a></h3>
 385
 386 <PRE>
 387 Make sure you selected the kernel menuconfig option :
 388     &lt;M&gt; or &lt;*&gt; Support logging events from userspace
 389 And that the ltt-userspace-event kernel module is loaded if selected as a
 390 module.
 391
 392 Simple userspace tracing is available through
 393 echo "some text to record" &gt; /mnt/debugfs/ltt/write_event
 394
 395 It will appear in the trace under event :
 396 channel : userspace
 397 event name : event
 398 </PRE>
 399
 400 <h3><a href="#TOCgetlttv" name="getlttv">Getting and installing the LTTV package
 401 (on the visualisation machine, same
 402 or different from the visualisation machine)</a></h3>
 403
 404 <PRE>
 405 su -
 406 cd /usr/src
 407 wget http://ltt.polymtl.ca/packages/lttv-0.x.xx-xxxx2008.tar.gz
 408 gzip -cd lttv-0.x.xx-xxxx2008.tar.gz | tar xvof -
 409 cd lttv-0.x.xx-xxxx2008
 410 (refer to README to see the development libraries that must be installed on your
 411 system)
 412 ./configure
 413 make
 414 make install
 415 # (run ldconfig to ensure new shared objects are taken into account)
 416 ldconfig
 417 </PRE>
 418
 419 <hr />
 420
 421
 422 <h2><a href="#TOCsection2" name="section2">Using LTTng and LTTV</a></h2>
 423
 424 <li><b>IMPORTANT : Arm Linux Kernel Markers after each boot before tracing</b></li>
 425 <PRE>
 426 ltt-armall
 427 </PRE>
 428
 429 <h3><a href="#TOCuselttvgui" name="uselttvgui">Use graphical LTTV to control
 430 tracing and analyse traces</a></h3>
 431 <PRE>
 432 lttv-gui (or /usr/local/bin/lttv-gui)
 433   - Spot the "Tracing Control" icon : click on it
 434       (it's a traffic light icon)
 435     - enter the root password
 436     - click "start"
 437     - click "stop"
 438     - Yes
 439       * You should now see a trace
 440 </PRE>
 441
 442 <h3><a href="#TOCuselttngtext" name="uselttngtext">Use text mode LTTng to control tracing</a></h3>
 443 <PRE>
 444 The tracing can be controlled from a terminal by using the lttctl command (as
 445 root).
 446
 447 Start tracing :
 448
 449 lttctl -C -w /tmp/trace1 trace1
 450
 451 Stop tracing and destroy trace channels :
 452
 453 lttctl -D trace1
 454
 455 see lttctl --help for details.
 456 </PRE>
 457 <p>
 458 (note : to see if the buffers has been filled, look at the dmesg output after
 459 lttctl -D or after stopping tracing from the GUI, it will show an event lost
 460 count. If it is the case, try using larger buffers. See lttctl --help to learn
 461 how. lttv now also shows event lost messages in the console when loading a trace
 462 with missing events or lost subbuffers.)
 463
 464 <h3><a href="#TOCuselttvtext" name="uselttvtext">Use text mode LTTV</a></h3>
 465 <p>
 466 Feel free to look in /usr/local/lib/lttv/plugins to see all the text and
 467 graphical plugins available.
 468 <p>
 469 For example, a simple trace dump in text format is available with :
 470 <PRE>
 471 lttv -m textDump -t /tmp/trace
 472 </PRE>
 473 <p>
 474 See lttv -m textDump --help for detailed command line options of textDump.
 475 <p>
 476 It is, in the current state of the project, very useful to use "grep" on the
 477 text output to filter by specific event fields. You can later copy the timestamp
 478 of the events to the clipboard and paste them in the GUI by clicking on the
 479 bottom right label "Current time". Support for this type of filtering should
 480 be added to the filter module soon.
 481
 482 <h3><a href="#TOChybrid" name="hybrid">Tracing in "Hybrid" mode</a></h3>
 483 <p>
 484 Starting from LTTng 0.5.105 and ltt-control 0.20, a new mode can be used :
 485 hybrid. It can be especially useful when studying big workloads on a long period
 486 of time.
 487 <p>
 488 When using this mode, the most important, low rate control information will be
 489 recorded during all the trace by lttd (i.e. process creation/exit). The high
 490 rate information (i.e. interrupt/traps/syscall entry/exit) will be kept in a
 491 flight recorder buffer (now named flight-channelname_X).
 492 <p>
 493 The following lttctl commands take an hybrid trace :
 494 <p>
 495 Create trace channel, start lttd on normal channels, start tracing:
 496 <PRE>
 497 lttctl -C -w /tmp/trace2 -o channel.kernel.overwrite=1 trace2
 498 </PRE>
 499 <p>
 500 Stop tracing, start lttd on flight recorder channels, destroy trace channels :
 501 <PRE>
 502 lttctl -D -w /tmp/trace2 trace2
 503 </PRE>
 504 <p>
 505 Each "overwrite" channel is flight recorder channel.
 506
 507
 508 <h3><a href="#TOCflight" name="flight">Tracing in flight recorder mode</a></h3>
 509 <li>Flight recorder mode</li>
 510 <p>
 511 The flight recorder mode writes data into overwritten buffers for all channels,
 512 including control channels, except for the facilities tracefiles. It consists of
 513 setting all channels to "overwrite".
 514 <p>
 515 The following lttctl commands take a flight recorder trace :
 516 <PRE>
 517 lttctl -C -w /tmp/trace3 -o channel.all.overwrite=1 trace3
 518 ...
 519 lttctl -D -w /tmp/trace3 trace3
 520 </PRE>
 521
 522 <hr />
 523
 524
 525 <h2><a href="#TOCsection3" name="section3">Adding new instrumentations with the
 526 markers</a></h2>
 527 <p>
 528
 529 <h3><a href="#TOCkerneltp" name="kerneltp">Adding kernel
 530 instrumentation</a></h3>
 531
 532 <p>
 533 See <a
 534 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>
 535 and <a
 536 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
 537 tree.
 538 <p>
 539 Also see <a
 540 href="http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=tree;f=ltt/probes">ltt/probes/</a>
 541 for LTTng probe examples.
 542
 543 <h3><a href="#TOCusertp" name="usertp">Adding userspace instrumentation</a></h3>
 544
 545 Add new events to userspace programs with
 546 <a href="http://ltt.polymtl.ca/packages/">userspace markers packages</a>.
 547 Get the latest markers-userspace-*.tar.bz2 and see the Makefile and examples. It
 548 allows inserting markers in executables and libraries, currently only on x86_32
 549 and x86_64.
 550 See <a
 551 href="http://ltt.polymtl.ca/packages/markers-userspace-0.5.tar.bz2">markers-userspace-0.5.tar.bz2</a> or more recent.
 552
 553 <p>
 554 Note that tracepoint/marker-based userspace tracing is available at <a
 555 href="http://lttng.org/ust/">LTTng User-space Tracer (UST)</a>.
 556
 557 <p>
 558 The easy quick-and-dirty way to perform userspace tracing is currently to write
 559 an string to /mnt/debugfs/ltt/write_event. See <a
 560 href="#userspacetracing">Userspace tracing</a> in the
 561 installation for sources section of this document.
 562
 563 <hr />
 564
 565 <h2><a href="#TOCsection4" name="section4">Creating Debian or RPM packages</a></h2>
 566 <p>
 567
 568 <h3><a href="#TOCpkgdebian" name="pkgdebian">Create custom LTTV Debian packages</a></h3>
 569
 570 <PRE>
 571 Use : dpkg-buildpackage -rfakeroot
 572 </PRE>
 573 <p>
 574 You should then have your LTTV .deb files created for your architecture.
 575
 576 <h3><a href="#TOCpkglttng" name="pkglttng">Create custom LTTng packages</a></h3>
 577 <p>
 578 For building LTTng Debian packages :
 579 get the build tree with patches applies as explained in section 2.
 580
 581 <PRE>
 582 make menuconfig (or xconfig or config) (customize your configuration)
 583 make-kpkg kernel_image
 584 </PRE>
 585 <p>
 586 You will then see your freshly created .deb in /usr/src. Install it with
 587 <PRE>
 588 dpkg -i /usr/src/(image-name).deb
 589 </PRE>
 590 <p>
 591 Then, follow the section "Editing the system wide configuration" in section 2.
 592
 593 <hr />
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