[lttv.git] / trunk / lttv / QUICKSTART.html

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<html>
<head>
  <title>Linux Trace Toolkit Next Generation User Documentation</title>
</head>
  <body>

<h1>Linux Trace Toolkit Next Generation User Documentation</h1>

Author : Mathieu Desnoyers, September 2005<br>
Last update : January 21st, 2009<br>
(originally known as the LTTng QUICKSTART guide)

<h2>Table of Contents</h2>
<ul>

<li><a href="#intro" name="TOCintro">Introduction</a></li>
<li><a href="#section1" name="TOCsection1">Installing LTTng and LTTV from
sources</a></li>
<li><a href="#section2" name="TOCsection2">Using LTTng and LTTV</a></li>
<li><a href="#section3" name="TOCsection3">Adding kernel and user-space
tracepoints</a></li>
<li><a href="#section4" name="TOCsection4">Creating Debian and RPM packages
from LTTV</a>

</ul>

<hr />

<h2><a href="#TOCintro" name="intro">Introduction</a></h2>
<p>
This document is made of four parts : the first one explains how
to install LTTng and LTTV from sources, the second one describes the steps
to follow to trace a system and view it. The third part explains
briefly how to add a new trace point to the kernel and to user space
applications. The fourth and last part explains how to create Debian or RPM
packages from the LTTng and LTTV sources.
<p>
These operations are made for installing the LTTng 0.86 tracer on a linux 2.6.X
kernel. You will also find instructions for installation of LTTV 0.12.x : the
Linux Trace Toolkit Viewer. 
To see the list of compatibilities between LTTng, ltt-control, LTTV, please
refer to :
<a
href="http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/lttng-lttv-compatibility.html">LTTng+LTTV versions compatibility</a>
The lttng patch is necessary to have the tracing hooks in the kernel.

<br>
<br>
Supported architectures : 
<br>
LTTng :<br>
<li> x86 32/64 bits
<li> PowerPC 32 and 64 bits
<li> ARM (with limited timestamping precision, e.g. 1HZ. Need
architecture-specific support for better precision)
<li> MIPS
<br>
<br>
LTTV :<br>
<li> Intel 32/64 bits
<li> PowerPC 32 and 64 bits
<li> Possibly others. Takes care of endianness and type size difference between
the LTTng traces and the LTTV analysis tool.

<hr />


<h2><a href="#TOCsection2" name="section2">Installation from sources</a></h2>
<p>

<li>Prerequisites</li>
<ul>
<p>
Tools needed to follow the package download steps :

<li>wget
<li>bzip2
<li>gzip
<li>tar

<p>
You have to install the standard development libraries and programs necessary
to compile a kernel :

<PRE>
(from Documentation/Changes in the Linux kernel tree)
Gnu C                2.95.3                # gcc --version
Gnu make             3.79.1                # make --version
binutils             2.12                  # ld -v
util-linux           2.10o                 # fdformat --version
module-init-tools    0.9.10                # depmod -V
</PRE>

<p>
You might also want to have libncurses5 to have the text mode kernel
configuration menu, but there are alternatives.

<p>
Prerequisites for LTTV 0.x.x installation are :

<PRE>
gcc 3.2 or better
gtk 2.4 or better development libraries
  (Debian : libgtk2.0, libgtk2.0-dev)
  (Fedora : gtk2, gtk2-devel)
  note : For Fedora users : this might require at least core 3 from Fedora,
  or you might have to compile your own GTK2 library.
glib 2.4 or better development libraries
  (Debian : libglib2.0-0, libglib2.0-dev)
  (Fedora : glib2, glib2-devel)
libpopt development libraries
  (Debian : libpopt0, libpopt-dev)
  (Fedora : popt)
libpango development libraries
  (Debian : libpango1.0, libpango1.0-dev)
  (Fedora : pango, pango-devel)
libc6 development librairies 
  (Debian : libc6, libc6-dev)
  (Fedora : glibc, glibc)
</PRE>
</ul>

<li>Reminder</li>

<p>
See the list of compatibilities between LTTng, ltt-control and LTTV at :
<a
href="http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/lttng-lttv-compatibility.html">LTTng+LTTV
versions compatibility</a>.


<li>Getting the LTTng packages</li>

<PRE>
su -
mkdir /usr/src/lttng
cd /usr/src/lttng
(see http://ltt.polymtl.ca/lttng for package listing)
wget http://ltt.polymtl.ca/lttng/patch-2.6.X-lttng-0.x.xx.tar.bz2
bzip2 -cd patch-2.6.X-lttng-0.x.xx.tar.bz2 | tar xvof -
</PRE>


<li>Getting LTTng kernel sources</li>

<PRE>
su -
cd /usr/src
wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.X.tar.bz2
bzip2 -cd linux-2.6.X.tar.bz2 | tar xvof -
cd linux-2.6.X
- For LTTng 0.9.4- cat /usr/src/lttng/patch*-2.6.X-lttng-0.x.xx* | patch -p1
- For LTTng 0.9.5+ apply the patches in the order specified in the series file,
  or use quilt
cd ..
mv linux-2.6.X linux-2.6.X-lttng-0.x.xx
</PRE>


<li>Installing a LTTng kernel</li>

<PRE>
su -
cd /usr/src/linux-2.6.X-lttng-0.x.xx
make menuconfig (or make xconfig or make config)
    Select the < Help > button if you are not familiar with kernel
    configuration.
    Items preceded by [*] means they has to be built into the kernel.
    Items preceded by [M] means they has to be built as modules.
    Items preceded by [ ] means they should be removed.
  go to the "General setup" section
    Select the following options :
    [*] Prompt for development and/or incomplete code/drivers
    [*] Activate markers
    [*] Activate userspace markers ABI (experimental, optional)
    [*] Immediate value optimization (optional)
    [*] Linux Trace Toolkit Next Generation (LTTng) --->
    <M> or <*> Compile lttng tracing probes
    <M> or <*> Linux Trace Toolkit High-speed Lockless Data Relay
    <M> or <*> Linux Trace Toolkit Lock-Protected Data Relay
    <M> or <*> Linux Trace Toolkit Serializer
    <M> or <*>   Linux Trace Toolkit Marker Control
    <M> or <*>     Linux Trace Toolkit Tracer
    [*] Align Linux Trace Toolkit Traces
    <M> or <*> Support logging events from userspace
    [*] Support trace extraction from crash dump
    <M> or <*> Linux Trace Toolkit Trace Controller
    <M> or <*> Linux Trace Toolkit State Dump
  Select <Exit>
  Select <Exit>
  Select <Yes>
make
make modules_install
(if necessary, create a initrd with mkinitrd or your preferate alternative)
(mkinitrd -o /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx)

-- on X86, X86_64
make install
reboot
Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader.

-- on PowerPC
cp vmlinux.strip /boot/vmlinux-2.6.X-lttng-0.x.xx
cp System.map /boot/System.map-2.6.X-lttng-0.x.xx
cp .config /boot/config-2.6.X-lttng-0.x.xx
depmod -ae -F /boot/System.map-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx
mkinitrd /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx
(edit /etc/yaboot.conf to add a new entry pointing to your kernel : the entry
that comes first is the default kernel)
ybin
select the right entry at the yaboot prompt (see choices : tab, select : type
the kernel name followed by enter)
Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader.
--
</PRE>

<li>Editing the system wide configuration</li>

<p>
You must activate debugfs and specify a mount point. This is typically done in
fstab such that it happens at boot time.  If you have never used DebugFS before,
these operation would do this for you :

<PRE>
mkdir /mnt/debugfs
cp /etc/fstab /etc/fstab.lttng.bkp
echo "debugfs         /mnt/debugfs    debugfs rw              0       0"  >> /etc/fstab
</PRE>

<p>
then, rebooting or issuing the following command will activate debugfs :
<PRE>
mount /mnt/debugfs
</PRE>

<p>
You need to load the LTT modules to be able to control tracing from user
space. This is done by issuing the following commands. Note however
these commands load all LTT modules. Depending on what options you chose to
compile statically, you may not need to issue all these commands. 

<PRE>
modprobe ltt-trace-control
modprobe ltt-marker-control
modprobe ltt-tracer
modprobe ltt-serialize
modprobe ltt-relay
modprobe ipc-trace
modprobe kernel-trace
modprobe mm-trace
modprobe net-trace
modprobe fs-trace
modprobe jbd2-trace
modprobe ext4-trace
modprobe syscall-trace
modprobe trap-trace
#if locking tracing is wanted, uncomment the following
#modprobe lockdep-trace
</PRE>

<p>
If you want to have complete information about the kernel state (including all
the process names), you need to load the ltt-statedump module. This is done by
issuing the command :

<PRE>
modprobe ltt-statedump
</PRE>
<p>
You can automate at boot time loading the ltt-control module by :

<PRE>
cp /etc/modules /etc/modules.bkp
echo ltt-trace-control >> /etc/modules
echo ltt-marker-control >> /etc/modules
echo ltt-tracer >> /etc/modules
echo ltt-serialize >> /etc/modules
echo ltt-relay >> /etc/modules
echo ipc-trace >> /etc/modules
echo kernel-trace >> /etc/modules
echo mm-trace >> /etc/modules
echo net-trace >> /etc/modules
echo fs-trace >> /etc/modules
echo jbd2-trace >> /etc/modules
echo ext4-trace >> /etc/modules
echo syscall-trace >> /etc/modules
echo trap-trace >> /etc/modules
#if locking tracing is wanted, uncomment the following
#echo lockdep-trace >> /etc/modules
</PRE>

<li>Getting and installing the ltt-control package (on the traced machine)</li>
<p>
(note : the ltt-control package contains lttd and lttctl. Although it has the
same name as the ltt-control kernel module, they are *not* the same thing.)

<PRE>
su -
cd /usr/src
wget http://ltt.polymtl.ca/lttng/ltt-control-0.x-xxxx2006.tar.gz
gzip -cd ltt-control-0.x-xxxx2008.tar.gz | tar xvof -
cd ltt-control-0.x-xxxx2006
(refer to README to see the development libraries that must be installed on you
system)
./configure
make
make install
</PRE>

<li>Userspace tracing</li>

<PRE>
Make sure you selected the kernel menuconfig option :
    <M> or <*> Support logging events from userspace
And that the ltt-userspace-event kernel module is loaded if selected as a
module.

Simple userspace tracing is available through
echo "some text to record" > /mnt/debugfs/ltt/write_event

It will appear in the trace under event :
channel : userspace
event name : event
</PRE>

<li>Getting and installing the LTTV package (on the visualisation machine, same
or different from the visualisation machine)</li>

<PRE>
su -
cd /usr/src
wget http://ltt.polymtl.ca/packages/lttv-0.x.xx-xxxx2008.tar.gz
gzip -cd lttv-0.x.xx-xxxx2008.tar.gz | tar xvof -
cd lttv-0.x.xx-xxxx2008
(refer to README to see the development libraries that must be installed on your
system)
./configure
make
make install
</PRE>

<li>Getting and installing the markers-userspace package for user space
tracing (experimental)</li>
<p>
See <a
href="http://ltt.polymtl.ca/packages/markers-userspace-0.5.tar.bz2">markers-userspace-0.5.tar.bz2</a> or more recent.

<hr />


<h2><a href="#TOCsection3" name="section3">Using LTTng and LTTV</a></h2>

<li>IMPORTANT : Arm Linux Kernel Markers after each boot</li>
<PRE>
ltt-armall
</PRE>

<li>Use graphical LTTV to control tracing and analyse traces</li>
<PRE>
lttv-gui (or /usr/local/bin/lttv-gui)
  - Spot the "Tracing Control" icon : click on it
      (it's a traffic light icon)
    - enter the root password
    - click "start"
    - click "stop"
    - Yes
      * You should now see a trace
</PRE>

<li>Use text mode LTTng to control tracing</li>
<PRE>
The tracing can be controlled from a terminal by using the lttctl command (as
root).

Start tracing :

lttctl -C -w /tmp/trace1 trace1

Stop tracing and destroy trace channels :

lttctl -D trace1

see lttctl --help for details.
</PRE>
<p>
(note : to see if the buffers has been filled, look at the dmesg output after
lttctl -R or after stopping tracing from the GUI, it will show an event lost
count. If it is the case, try using larger buffers. See lttctl --help to learn 
how. lttv now also shows event lost messages in the console when loading a trace
with missing events or lost subbuffers.)

<li>Use text mode LTTV</li>
<p>
Feel free to look in /usr/local/lib/lttv/plugins to see all the text and
graphical plugins available.
<p>
For example, a simple trace dump in text format is available with :
<PRE>
lttv -m textDump -t /tmp/trace
</PRE>
<p>
See lttv -m textDump --help for detailed command line options of textDump.
<p>
It is, in the current state of the project, very useful to use "grep" on the
text output to filter by specific event fields. You can later copy the timestamp
of the events to the clipboard and paste them in the GUI by clicking on the
bottom right label "Current time". Support for this type of filtering should
be added to the filter module soon.

<li>Hybrid mode</li>
<p>
Starting from LTTng 0.5.105 and ltt-control 0.20, a new mode can be used :
hybrid. It can be especially useful when studying big workloads on a long period
of time.
<p>
When using this mode, the most important, low rate control information will be
recorded during all the trace by lttd (i.e. process creation/exit). The high
rate information (i.e. interrupt/traps/syscall entry/exit) will be kept in a
flight recorder buffer (now named flight-channelname_X).
<p>
The following lttctl commands take an hybrid trace :
<p>
Create trace channel, start lttd on normal channels, start tracing:
<PRE>
lttctl -C -w /tmp/trace2 -o channel.kernel.overwrite=1 trace2
</PRE>
<p>
Stop tracing, start lttd on flight recorder channels, destroy trace channels :
<PRE>
lttctl -D -w /tmp/trace2 trace2
</PRE>
<p>
Each "overwrite" channel is flight recorder channel.

<li>Flight recorder mode</li>
<p>
The flight recorder mode writes data into overwritten buffers for all channels,
including control channels, except for the facilities tracefiles. It consists of
setting all channels to "overwrite".
<p>
The following lttctl commands take a flight recorder trace :
<PRE>
lttctl -C -w /tmp/trace3 -o channel.all.overwrite=1 trace3
...
lttctl -D -w /tmp/trace3 trace3
</PRE>

**************************************************************
** Section 4 * Adding new instrumentations with the markers **
**************************************************************

See Documentation/markers.txt and Documentation/tracepoints.txt in your kernel
tree.

* Add new events to userspace programs with userspace markers
http://ltt.polymtl.ca/packages/

Get the latest markers-userspace-*.tar.bz2 and see the Makefile and examples. It
allows inserting markers in executables and libraries, currently only on x86_32
and x86_64.

***********************************************************
** Section 5 * Creating Debian or RPM packages           **
***********************************************************

* Create custom LTTV Debian packages

Use : dpkg-buildpackage -rfakeroot

You should then have your LTTV .deb files created for your architecture.

* Create custom LTTng packages

For building LTTng Debian packages :

Get the build tree with patches applies as explained in section 2.

make menuconfig (or xconfig or config) (customize your configuration)
make-kpkg kernel_image

You will then see your freshly created .deb in /usr/src. Install it with
dpkg -i /usr/src/(image-name).deb

Then, follow the section "Editing the system wide configuration" in section 2.


  </body>
</html>
Commit	Line	Data
c924c2c6	1	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
	2	<html>
	3	<head>
bc58079d	4	<title>Linux Trace Toolkit Next Generation User Documentation</title>
c924c2c6	5	</head>
	6	<body>
	7
bc58079d	8	<h1>Linux Trace Toolkit Next Generation User Documentation</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>
	15	<ul>
	16
f9ff56f3	17	<li><a href="#intro" name="TOCintro">Introduction</a></li>
24070967	18	<li><a href="#section1" name="TOCsection1">Installing LTTng and LTTV from
	19	sources</a></li>
	20	<li><a href="#section2" name="TOCsection2">Using LTTng and LTTV</a></li>
	21	<li><a href="#section3" name="TOCsection3">Adding kernel and user-space
	22	tracepoints</a></li>
633bc4a3	23	<li><a href="#section4" name="TOCsection4">Creating Debian and RPM packages
633bc4a3	24	from LTTV</a>
c924c2c6	25
f9ff56f3	26	</ul>
	27
	28	<hr />
	29
b9e1fab1	30	<h2><a href="#TOCintro" name="intro">Introduction</a></h2>
c924c2c6	31	<p>
633bc4a3	32	This document is made of four parts : the first one explains how
24070967	33	to install LTTng and LTTV from sources, the second one describes the steps
633bc4a3	34	to follow to trace a system and view it. The third part explains
c924c2c6	35	briefly how to add a new trace point to the kernel and to user space
633bc4a3	36	applications. The fourth and last part explains how to create Debian or RPM
633bc4a3	37	packages from the LTTng and LTTV sources.
c924c2c6	38	<p>
24070967	39	These operations are made for installing the LTTng 0.86 tracer on a linux 2.6.X
c924c2c6	40	kernel. You will also find instructions for installation of LTTV 0.12.x : the
c924c2c6	41	Linux Trace Toolkit Viewer.
24070967	42	To see the list of compatibilities between LTTng, ltt-control, LTTV, please
24070967	43	refer to :
c924c2c6	44	<a
c924c2c6	45	href="http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/lttng-lttv-compatibility.html">LTTng+LTTV versions compatibility</a>
24070967	46	The lttng patch is necessary to have the tracing hooks in the kernel.
c924c2c6	47
24070967	48	<br>
24070967	49	<br>
633bc4a3	50	Supported architectures :
24070967	51	<br>
c924c2c6	52	LTTng :<br>
c924c2c6	53	<li> x86 32/64 bits
	54	<li> PowerPC 32 and 64 bits
	55	<li> ARM (with limited timestamping precision, e.g. 1HZ. Need
	56	architecture-specific support for better precision)
	57	<li> MIPS
	58	<br>
24070967	59	<br>
c924c2c6	60	LTTV :<br>
c924c2c6	61	<li> Intel 32/64 bits
	62	<li> PowerPC 32 and 64 bits
	63	<li> Possibly others. Takes care of endianness and type size difference between
	64	the LTTng traces and the LTTV analysis tool.
	65
f9ff56f3	66	<hr />
f9ff56f3	67
c924c2c6	68
633bc4a3	69	<h2><a href="#TOCsection2" name="section2">Installation from sources</a></h2>
633bc4a3	70	<p>
c924c2c6	71
633bc4a3	72	<li>Prerequisites</li>
	73	<ul>
	74	<p>
c924c2c6	75	Tools needed to follow the package download steps :
c924c2c6	76
633bc4a3	77	<li>wget
	78	<li>bzip2
	79	<li>gzip
	80	<li>tar
c924c2c6	81
633bc4a3	82	<p>
c924c2c6	83	You have to install the standard development libraries and programs necessary
	84	to compile a kernel :
	85
84cf5903	86	<PRE>
c924c2c6	87	(from Documentation/Changes in the Linux kernel tree)
84cf5903	88	Gnu C 2.95.3 # gcc --version
	89	Gnu make 3.79.1 # make --version
	90	binutils 2.12 # ld -v
	91	util-linux 2.10o # fdformat --version
	92	module-init-tools 0.9.10 # depmod -V
	93	</PRE>
c924c2c6	94
633bc4a3	95	<p>
c924c2c6	96	You might also want to have libncurses5 to have the text mode kernel
	97	configuration menu, but there are alternatives.
	98
633bc4a3	99	<p>
c924c2c6	100	Prerequisites for LTTV 0.x.x installation are :
c924c2c6	101
84cf5903	102	<PRE>
	103	gcc 3.2 or better
	104	gtk 2.4 or better development libraries
c924c2c6	105	(Debian : libgtk2.0, libgtk2.0-dev)
	106	(Fedora : gtk2, gtk2-devel)
	107	note : For Fedora users : this might require at least core 3 from Fedora,
	108	or you might have to compile your own GTK2 library.
84cf5903	109	glib 2.4 or better development libraries
c924c2c6	110	(Debian : libglib2.0-0, libglib2.0-dev)
c924c2c6	111	(Fedora : glib2, glib2-devel)
84cf5903	112	libpopt development libraries
c924c2c6	113	(Debian : libpopt0, libpopt-dev)
c924c2c6	114	(Fedora : popt)
84cf5903	115	libpango development libraries
c924c2c6	116	(Debian : libpango1.0, libpango1.0-dev)
c924c2c6	117	(Fedora : pango, pango-devel)
84cf5903	118	libc6 development librairies
c924c2c6	119	(Debian : libc6, libc6-dev)
c924c2c6	120	(Fedora : glibc, glibc)
84cf5903	121	</PRE>
633bc4a3	122	</ul>
c924c2c6	123
c8997124	124	<li>Reminder</li>
c924c2c6	125
c8997124	126	<p>
633bc4a3	127	See the list of compatibilities between LTTng, ltt-control and LTTV at :
	128	<a
	129	href="http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/lttng-lttv-compatibility.html">LTTng+LTTV
	130	versions compatibility</a>.
c924c2c6	131
c924c2c6	132
c8997124	133	<li>Getting the LTTng packages</li>
c924c2c6	134
c8997124	135	<PRE>
c924c2c6	136	su -
	137	mkdir /usr/src/lttng
	138	cd /usr/src/lttng
	139	(see http://ltt.polymtl.ca/lttng for package listing)
	140	wget http://ltt.polymtl.ca/lttng/patch-2.6.X-lttng-0.x.xx.tar.bz2
	141	bzip2 -cd patch-2.6.X-lttng-0.x.xx.tar.bz2 \| tar xvof -
c8997124	142	</PRE>
c924c2c6	143
c924c2c6	144
c8997124	145	<li>Getting LTTng kernel sources</li>
c924c2c6	146
c8997124	147	<PRE>
c924c2c6	148	su -
	149	cd /usr/src
	150	wget http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.X.tar.bz2
	151	bzip2 -cd linux-2.6.X.tar.bz2 \| tar xvof -
	152	cd linux-2.6.X
	153	- For LTTng 0.9.4- cat /usr/src/lttng/patch-2.6.X-lttng-0.x.xx \| patch -p1
	154	- For LTTng 0.9.5+ apply the patches in the order specified in the series file,
	155	or use quilt
	156	cd ..
	157	mv linux-2.6.X linux-2.6.X-lttng-0.x.xx
c8997124	158	</PRE>
c924c2c6	159
c924c2c6	160
c8997124	161	<li>Installing a LTTng kernel</li>
c924c2c6	162
c8997124	163	<PRE>
c924c2c6	164	su -
	165	cd /usr/src/linux-2.6.X-lttng-0.x.xx
	166	make menuconfig (or make xconfig or make config)
	167	Select the < Help > button if you are not familiar with kernel
	168	configuration.
	169	Items preceded by [*] means they has to be built into the kernel.
	170	Items preceded by [M] means they has to be built as modules.
	171	Items preceded by [ ] means they should be removed.
	172	go to the "General setup" section
	173	Select the following options :
	174	[*] Prompt for development and/or incomplete code/drivers
	175	[*] Activate markers
	176	[*] Activate userspace markers ABI (experimental, optional)
	177	[*] Immediate value optimization (optional)
	178	[*] Linux Trace Toolkit Next Generation (LTTng) --->
	179	<M> or <*> Compile lttng tracing probes
	180	<M> or <*> Linux Trace Toolkit High-speed Lockless Data Relay
	181	<M> or <*> Linux Trace Toolkit Lock-Protected Data Relay
	182	<M> or <*> Linux Trace Toolkit Serializer
	183	<M> or <*> Linux Trace Toolkit Marker Control
	184	<M> or <*> Linux Trace Toolkit Tracer
	185	[*] Align Linux Trace Toolkit Traces
	186	<M> or <*> Support logging events from userspace
	187	[*] Support trace extraction from crash dump
	188	<M> or <*> Linux Trace Toolkit Trace Controller
	189	<M> or <*> Linux Trace Toolkit State Dump
	190	Select <Exit>
	191	Select <Exit>
	192	Select <Yes>
	193	make
	194	make modules_install
	195	(if necessary, create a initrd with mkinitrd or your preferate alternative)
	196	(mkinitrd -o /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx)
	197
	198	-- on X86, X86_64
	199	make install
	200	reboot
	201	Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader.
	202
	203	-- on PowerPC
	204	cp vmlinux.strip /boot/vmlinux-2.6.X-lttng-0.x.xx
	205	cp System.map /boot/System.map-2.6.X-lttng-0.x.xx
	206	cp .config /boot/config-2.6.X-lttng-0.x.xx
	207	depmod -ae -F /boot/System.map-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx
	208	mkinitrd /boot/initrd.img-2.6.X-lttng-0.x.xx 2.6.X-lttng-0.x.xx
	209	(edit /etc/yaboot.conf to add a new entry pointing to your kernel : the entry
	210	that comes first is the default kernel)
	211	ybin
	212	select the right entry at the yaboot prompt (see choices : tab, select : type
	213	the kernel name followed by enter)
	214	Select the Linux 2.6.X-lttng-0.x.xx kernel in your boot loader.
	215	--
c8997124	216	</PRE>
c924c2c6	217
c8997124	218	<li>Editing the system wide configuration</li>
c924c2c6	219
c8997124	220	<p>
c924c2c6	221	You must activate debugfs and specify a mount point. This is typically done in
c8997124	222	fstab such that it happens at boot time. If you have never used DebugFS before,
c8997124	223	these operation would do this for you :
c924c2c6	224
c8997124	225	<PRE>
c924c2c6	226	mkdir /mnt/debugfs
	227	cp /etc/fstab /etc/fstab.lttng.bkp
	228	echo "debugfs /mnt/debugfs debugfs rw 0 0" >> /etc/fstab
c8997124	229	</PRE>
c924c2c6	230
c8997124	231	<p>
c924c2c6	232	then, rebooting or issuing the following command will activate debugfs :
c8997124	233	<PRE>
c924c2c6	234	mount /mnt/debugfs
c8997124	235	</PRE>
c924c2c6	236
c8997124	237	<p>
c924c2c6	238	You need to load the LTT modules to be able to control tracing from user
	239	space. This is done by issuing the following commands. Note however
	240	these commands load all LTT modules. Depending on what options you chose to
	241	compile statically, you may not need to issue all these commands.
	242
c8997124	243	<PRE>
c924c2c6	244	modprobe ltt-trace-control
	245	modprobe ltt-marker-control
	246	modprobe ltt-tracer
	247	modprobe ltt-serialize
	248	modprobe ltt-relay
	249	modprobe ipc-trace
	250	modprobe kernel-trace
	251	modprobe mm-trace
	252	modprobe net-trace
	253	modprobe fs-trace
	254	modprobe jbd2-trace
	255	modprobe ext4-trace
	256	modprobe syscall-trace
	257	modprobe trap-trace
	258	#if locking tracing is wanted, uncomment the following
	259	#modprobe lockdep-trace
c8997124	260	</PRE>
c924c2c6	261
c8997124	262	<p>
c924c2c6	263	If you want to have complete information about the kernel state (including all
	264	the process names), you need to load the ltt-statedump module. This is done by
	265	issuing the command :
	266
c8997124	267	<PRE>
c924c2c6	268	modprobe ltt-statedump
c8997124	269	</PRE>
c8997124	270	<p>
c924c2c6	271	You can automate at boot time loading the ltt-control module by :
c924c2c6	272
c8997124	273	<PRE>
c924c2c6	274	cp /etc/modules /etc/modules.bkp
	275	echo ltt-trace-control >> /etc/modules
	276	echo ltt-marker-control >> /etc/modules
	277	echo ltt-tracer >> /etc/modules
	278	echo ltt-serialize >> /etc/modules
	279	echo ltt-relay >> /etc/modules
	280	echo ipc-trace >> /etc/modules
	281	echo kernel-trace >> /etc/modules
	282	echo mm-trace >> /etc/modules
	283	echo net-trace >> /etc/modules
	284	echo fs-trace >> /etc/modules
	285	echo jbd2-trace >> /etc/modules
	286	echo ext4-trace >> /etc/modules
	287	echo syscall-trace >> /etc/modules
	288	echo trap-trace >> /etc/modules
	289	#if locking tracing is wanted, uncomment the following
	290	#echo lockdep-trace >> /etc/modules
c8997124	291	</PRE>
c924c2c6	292
c8997124	293	<li>Getting and installing the ltt-control package (on the traced machine)</li>
c8997124	294	<p>
c924c2c6	295	(note : the ltt-control package contains lttd and lttctl. Although it has the
c924c2c6	296	same name as the ltt-control kernel module, they are not the same thing.)
c8997124	297
c8997124	298	<PRE>
c924c2c6	299	su -
	300	cd /usr/src
	301	wget http://ltt.polymtl.ca/lttng/ltt-control-0.x-xxxx2006.tar.gz
	302	gzip -cd ltt-control-0.x-xxxx2008.tar.gz \| tar xvof -
	303	cd ltt-control-0.x-xxxx2006
	304	(refer to README to see the development libraries that must be installed on you
	305	system)
	306	./configure
	307	make
	308	make install
c8997124	309	</PRE>
c924c2c6	310
c8997124	311	<li>Userspace tracing</li>
c924c2c6	312
c8997124	313	<PRE>
c924c2c6	314	Make sure you selected the kernel menuconfig option :
	315	<M> or <*> Support logging events from userspace
	316	And that the ltt-userspace-event kernel module is loaded if selected as a
	317	module.
	318
	319	Simple userspace tracing is available through
	320	echo "some text to record" > /mnt/debugfs/ltt/write_event
	321
	322	It will appear in the trace under event :
	323	channel : userspace
	324	event name : event
c8997124	325	</PRE>
c924c2c6	326
c8997124	327	<li>Getting and installing the LTTV package (on the visualisation machine, same
c8997124	328	or different from the visualisation machine)</li>
c924c2c6	329
c8997124	330	<PRE>
c924c2c6	331	su -
	332	cd /usr/src
	333	wget http://ltt.polymtl.ca/packages/lttv-0.x.xx-xxxx2008.tar.gz
	334	gzip -cd lttv-0.x.xx-xxxx2008.tar.gz \| tar xvof -
	335	cd lttv-0.x.xx-xxxx2008
	336	(refer to README to see the development libraries that must be installed on your
	337	system)
	338	./configure
	339	make
	340	make install
13d7a628	341	</PRE>
c924c2c6	342
c8997124	343	<li>Getting and installing the markers-userspace package for user space
c8997124	344	tracing (experimental)</li>
3fafc0cd	345	<p>
c8997124	346	See <a
c8997124	347	href="http://ltt.polymtl.ca/packages/markers-userspace-0.5.tar.bz2">markers-userspace-0.5.tar.bz2</a> or more recent.
c924c2c6	348
c8997124	349	<hr />
c924c2c6	350
c924c2c6	351
c8997124	352	<h2><a href="#TOCsection3" name="section3">Using LTTng and LTTV</a></h2>
c924c2c6	353
c8997124	354	<li>IMPORTANT : Arm Linux Kernel Markers after each boot</li>
c8997124	355	<PRE>
c924c2c6	356	ltt-armall
c8997124	357	</PRE>
c924c2c6	358
c8997124	359	<li>Use graphical LTTV to control tracing and analyse traces</li>
c8997124	360	<PRE>
c924c2c6	361	lttv-gui (or /usr/local/bin/lttv-gui)
	362	- Spot the "Tracing Control" icon : click on it
	363	(it's a traffic light icon)
	364	- enter the root password
	365	- click "start"
	366	- click "stop"
	367	- Yes
	368	* You should now see a trace
c8997124	369	</PRE>
c924c2c6	370
c8997124	371	<li>Use text mode LTTng to control tracing</li>
c8997124	372	<PRE>
c924c2c6	373	The tracing can be controlled from a terminal by using the lttctl command (as
	374	root).
	375
	376	Start tracing :
	377
	378	lttctl -C -w /tmp/trace1 trace1
	379
	380	Stop tracing and destroy trace channels :
	381
	382	lttctl -D trace1
	383
	384	see lttctl --help for details.
df7f63ab	385	</PRE>
c8997124	386	<p>
c924c2c6	387	(note : to see if the buffers has been filled, look at the dmesg output after
	388	lttctl -R or after stopping tracing from the GUI, it will show an event lost
	389	count. If it is the case, try using larger buffers. See lttctl --help to learn
	390	how. lttv now also shows event lost messages in the console when loading a trace
	391	with missing events or lost subbuffers.)
	392
c8997124	393	<li>Use text mode LTTV</li>
c8997124	394	<p>
c924c2c6	395	Feel free to look in /usr/local/lib/lttv/plugins to see all the text and
c924c2c6	396	graphical plugins available.
c8997124	397	<p>
c924c2c6	398	For example, a simple trace dump in text format is available with :
c8997124	399	<PRE>
c924c2c6	400	lttv -m textDump -t /tmp/trace
c8997124	401	</PRE>
c8997124	402	<p>
c8997124	403	See lttv -m textDump --help for detailed command line options of textDump.
c8997124	404	<p>
c924c2c6	405	It is, in the current state of the project, very useful to use "grep" on the
	406	text output to filter by specific event fields. You can later copy the timestamp
	407	of the events to the clipboard and paste them in the GUI by clicking on the
	408	bottom right label "Current time". Support for this type of filtering should
	409	be added to the filter module soon.
	410
c8997124	411	<li>Hybrid mode</li>
c8997124	412	<p>
c924c2c6	413	Starting from LTTng 0.5.105 and ltt-control 0.20, a new mode can be used :
	414	hybrid. It can be especially useful when studying big workloads on a long period
	415	of time.
c8997124	416	<p>
c924c2c6	417	When using this mode, the most important, low rate control information will be
	418	recorded during all the trace by lttd (i.e. process creation/exit). The high
	419	rate information (i.e. interrupt/traps/syscall entry/exit) will be kept in a
	420	flight recorder buffer (now named flight-channelname_X).
c8997124	421	<p>
c924c2c6	422	The following lttctl commands take an hybrid trace :
c8997124	423	<p>
c924c2c6	424	Create trace channel, start lttd on normal channels, start tracing:
c8997124	425	<PRE>
c924c2c6	426	lttctl -C -w /tmp/trace2 -o channel.kernel.overwrite=1 trace2
c8997124	427	</PRE>
c8997124	428	<p>
c924c2c6	429	Stop tracing, start lttd on flight recorder channels, destroy trace channels :
c8997124	430	<PRE>
c924c2c6	431	lttctl -D -w /tmp/trace2 trace2
c8997124	432	</PRE>
c8997124	433	<p>
c924c2c6	434	Each "overwrite" channel is flight recorder channel.
c924c2c6	435
c8997124	436	<li>Flight recorder mode</li>
c8997124	437	<p>
c924c2c6	438	The flight recorder mode writes data into overwritten buffers for all channels,
	439	including control channels, except for the facilities tracefiles. It consists of
	440	setting all channels to "overwrite".
c8997124	441	<p>
c924c2c6	442	The following lttctl commands take a flight recorder trace :
c8997124	443	<PRE>
c924c2c6	444	lttctl -C -w /tmp/trace3 -o channel.all.overwrite=1 trace3
	445	...
	446	lttctl -D -w /tmp/trace3 trace3
c8997124	447	</PRE>
c924c2c6	448
	449	**************************************************************
	450	** Section 4 * Adding new instrumentations with the markers **
	451	**************************************************************
	452
	453	See Documentation/markers.txt and Documentation/tracepoints.txt in your kernel
	454	tree.
	455
	456	* Add new events to userspace programs with userspace markers
	457	http://ltt.polymtl.ca/packages/
	458
	459	Get the latest markers-userspace-*.tar.bz2 and see the Makefile and examples. It
	460	allows inserting markers in executables and libraries, currently only on x86_32
	461	and x86_64.
	462
633bc4a3	463	***********************************************************
	464	** Section 5 * Creating Debian or RPM packages **
	465	***********************************************************
	466
	467	* Create custom LTTV Debian packages
	468
	469	Use : dpkg-buildpackage -rfakeroot
	470
	471	You should then have your LTTV .deb files created for your architecture.
	472
	473	* Create custom LTTng packages
	474
	475	For building LTTng Debian packages :
	476
	477	Get the build tree with patches applies as explained in section 2.
	478
	479	make menuconfig (or xconfig or config) (customize your configuration)
	480	make-kpkg kernel_image
	481
	482	You will then see your freshly created .deb in /usr/src. Install it with
	483	dpkg -i /usr/src/(image-name).deb
	484
	485	Then, follow the section "Editing the system wide configuration" in section 2.
	486
	487
	488
c924c2c6	489	</body>
c924c2c6	490	</html>