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1bb74e94 | 1 | LTTNG USERSPACE TRACER (LTTng-UST) |
1af1f1db PMF |
2 | ---------------------------- |
3 | ||
77ca1460 | 4 | UST web site: http://lttng.org |
2615de09 | 5 | |
0207cc51 | 6 | Updated versions of this package may be found at: |
0207cc51 | 7 | |
77ca1460 | 8 | * Releases: http://lttng.org/download |
1bb74e94 MD |
9 | * GitWeb: http://git.lttng.org (project: lttng-ust) |
10 | * Git: git://git.lttng.org/lttng-ust.git | |
2615de09 | 11 | |
2615de09 | 12 | |
2a93485b | 13 | PREREQUISITES: |
6514bc5d | 14 | |
2a93485b | 15 | - liburcu |
2a93485b | 16 | Userspace RCU library, by Mathieu Desnoyers and Paul E. McKenney |
2615de09 | 17 | |
bf956ec0 | 18 | -> This release depends on liburcu v0.7.2 |
2615de09 | 19 | |
8f03ca96 PMF |
20 | * Debian/Ubuntu package: liburcu-dev |
21 | * Website: http://lttng.org/urcu | |
22 | * Releases: http://lttng.org/files/urcu | |
23 | * GitWeb: http://lttng.org/cgi-bin/gitweb.cgi?p=userspace-rcu.git;a=summary | |
24 | * Git: git://lttng.org/userspace-rcu.git | |
cbccb4a9 | 25 | |
efac0f0f MD |
26 | For developers using the git tree: |
27 | ||
28 | This source tree is based on the autotools suite from GNU to simplify | |
29 | portability. Here are some things you should have on your system in order to | |
30 | compile the git repository tree : | |
31 | ||
32 | - GNU autotools (automake >=1.10, autoconf >=2.50, autoheader >=2.50) | |
33 | (make sure your system wide "automake" points to a recent version!) | |
34 | - GNU Libtool >=2.2 | |
35 | (for more information, go to http://www.gnu.org/software/autoconf/) | |
7fedf800 JG |
36 | - Perl (optional) |
37 | Needed for make check and tests. | |
efac0f0f MD |
38 | |
39 | If you get the tree from the repository, you will need to use the "bootstrap" | |
40 | script in the root of the tree. It calls all the GNU tools needed to prepare the | |
41 | tree configuration. | |
42 | ||
2a93485b | 43 | |
5de791bd | 44 | INSTALLATION INSTRUCTIONS: |
2a93485b | 45 | |
7066ec32 | 46 | - Download, compile and install liburcu. |
2a93485b PMF |
47 | - In this package's tree, run ./configure. |
48 | - Run make. | |
49 | - Run make install. | |
50 | - Run ldconfig. | |
2a93485b | 51 | |
1ffa770b PMF |
52 | If compiling from the git repository, run ./bootstrap before running |
53 | the configure script, to generate it. | |
2a93485b | 54 | |
b7ce18ac JG |
55 | Note that configure sets '/usr/local' as the default prefix for files it |
56 | installs. However, this path is not part of most distributions' default | |
57 | library path which will cause builds depending on liblttng-ust to fail unless | |
58 | '-L/usr/local/lib' is added to LDFLAGS. You may provide a custom prefix to | |
59 | configure by using the --prefix switch. | |
2a93485b | 60 | |
5e96a467 MD |
61 | USAGE: |
62 | ||
63 | - Create an instrumentation header following the tracepoint examples. | |
8844360e | 64 | See lttng/tracepoint.h, and examples. |
628e1d81 MD |
65 | |
66 | There are 2 ways to compile the Tracepoint Provider with the | |
67 | application: either statically or dynamically. Please follow | |
68 | carefully: | |
69 | ||
70 | 1.1) Compile the Tracepoint provider with the application, either | |
71 | directly or through a static library (.a): | |
72 | - Into exactly one object of your application: define | |
73 | "TRACEPOINT_DEFINE" and include the tracepoint provider. | |
8844360e MD |
74 | - Use "-I." for the compilation unit containing the tracepoint |
75 | provider include (e.g. tp.c). | |
c6c454ab | 76 | - Link application with "-ldl" on Linux, with "-lc" on BSD. |
0ba9b647 MD |
77 | - If building the provider directly into the application, |
78 | link the application with "-llttng-ust". | |
79 | - If building a static library for the provider, link the static | |
a16877ab | 80 | library with "-llttng-ust". |
628e1d81 MD |
81 | - Include the tracepoint provider header into all C files using |
82 | the provider. | |
a106a9f8 JG |
83 | - Examples: |
84 | - doc/examples/easy-ust/ sample.c sample_component_provider.h | |
85 | tp.c Makefile | |
86 | - doc/examples/hello-static-lib/ hello.c tp.c ust_test_hello.h | |
87 | Makefile | |
628e1d81 MD |
88 | |
89 | 2) Compile the Tracepoint Provider separately from the application, | |
90 | using dynamic linking: | |
91 | - Into exactly one object of your application: define | |
92 | "TRACEPOINT_DEFINE" _and_ also define | |
93 | "TRACEPOINT_PROBE_DYNAMIC_LINKAGE", then include the tracepoint | |
94 | provider header. | |
95 | - Include the tracepoint provider header into all instrumented C | |
96 | files that use the provider. | |
8844360e MD |
97 | - Compile the tracepoint provider with "-I.". |
98 | - Link the tracepoint provider with "-llttng-ust". | |
c6c454ab | 99 | - Link application with "-ldl" on Linux, "-lc" on BSD. |
8844360e MD |
100 | - Set a LD_PRELOAD environment to preload the tracepoint provider |
101 | shared object before starting the application when tracing is | |
b834dead MD |
102 | needed. Another way is to dlopen the tracepoint probe when needed |
103 | by the application. | |
8844360e | 104 | - Example: |
a106a9f8 | 105 | - doc/examples/demo demo.c tp*.c ust_tests_demo*.h demo-trace Makefile |
628e1d81 | 106 | |
13fb2d2c JG |
107 | - Note about dlclose() usage: it is not safe to use dlclose on a |
108 | provider shared object that is being actively used for tracing due | |
109 | to a lack of reference counting from lttng-ust to the used shared | |
110 | object. | |
a106a9f8 JG |
111 | - Enable instrumentation and control tracing with the "lttng" command |
112 | from lttng-tools. See lttng-tools doc/quickstart.txt. | |
46d52200 | 113 | - Note for C++ support: since LTTng-UST 2.3, both tracepoints and |
8481f7a0 ZT |
114 | tracepoint probes can be compiled in C++. To compile tracepoint probes |
115 | in C++, you need g++ >= 4.7 or Clang. | |
a106a9f8 | 116 | |
5e96a467 | 117 | |
cf12a773 MD |
118 | ENVIRONMENT VARIABLES: |
119 | ||
f3049ad9 MD |
120 | - liblttng-ust debug can be activated by setting the environment variable |
121 | "LTTNG_UST_DEBUG" when launching the application. It can also be enabled | |
122 | at compile-time by compiling libust with -DLTTNG_UST_DEBUG. | |
cf12a773 | 123 | |
f3049ad9 | 124 | - The environment variable "LTTNG_UST_REGISTER_TIMEOUT" can be used to |
cf12a773 MD |
125 | specify how long the applications should wait for sessiond |
126 | "registration done" command before proceeding to execute the main | |
127 | program. The default is 3000ms (3 seconds). The timeout value is | |
7b766b16 | 128 | specified in milliseconds. The value 0 means "don't wait". The value |
8844360e MD |
129 | -1 means "wait forever". Setting this environment variable to 0 is |
130 | recommended for applications with time constraints on the process | |
131 | startup time. | |
5e96a467 | 132 | |
fdb4af10 MD |
133 | - The compilation flag "-DLTTNG_UST_DEBUG_VALGRIND" should be enabled |
134 | at build time to allow liblttng-ust to be used with valgrind | |
135 | (side-effect: disables per-cpu buffering). | |
136 | ||
5e96a467 | 137 | |
5de791bd PMF |
138 | TRACE VIEWER: |
139 | ||
77ca1460 | 140 | Use babeltrace for viewing traces generated by LTTng UST 2.x. |
f3049ad9 | 141 | See http://lttng.org for download. |
5de791bd PMF |
142 | |
143 | ||
13ef5c0e MD |
144 | CONTACT: |
145 | ||
146 | Maintainer: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
1bb74e94 | 147 | Mailing list: lttng-dev@lists.lttng.org |
13ef5c0e MD |
148 | |
149 | ||
2a93485b PMF |
150 | PACKAGE CONTENTS: |
151 | ||
5de791bd PMF |
152 | This package contains the following elements. |
153 | ||
f3049ad9 | 154 | - liblttng-ust |
2a93485b PMF |
155 | The actual userspace tracing library that must be linked to the |
156 | instrumented programs. | |
157 | ||
56097329 PMF |
158 | - include |
159 | The public header files that will be installed on the system. | |
160 | ||
a4c5d022 PMF |
161 | - tests |
162 | Various test programs | |
2a93485b | 163 | |
476037d9 | 164 | - liblttng-ust-libc-wrapper |
1622ba22 MD |
165 | An example library that can be LD_PRELOAD'ed to instrument some |
166 | calls to libc (currently malloc() and free()) in any program without | |
167 | need to recompile it. | |
2a93485b | 168 | |
f3049ad9 | 169 | - liblttng-ust-fork |
2a93485b | 170 | A library that is LD_PRELOAD'ed, and that hijacks calls to several system |
1ffa770b PMF |
171 | calls in order to trace across these calls. It _has_ to be LD_PRELOAD'ed |
172 | in order to hijack calls. In contrast, libust may be linked at build time. | |
a4c5d022 | 173 | |
f3049ad9 MD |
174 | - liblttng-ust-ctl |
175 | A library to control tracing in other processes. Used by lttng-tools. | |
a4c5d022 | 176 | |
f3049ad9 MD |
177 | - liblttng-ust-comm |
178 | A static library shared between libust and lttng-tools, that | |
9dc7b7ff NC |
179 | provides functions that allow these components to communicate together. |
180 | ||
8844360e MD |
181 | - libringbuffer |
182 | The ring buffer implementation used within LTTng-UST. | |
183 | ||
a4c5d022 PMF |
184 | - snprintf |
185 | An asynchronous signal-safe version of snprintf. | |
186 | ||
8844360e | 187 | - liblttng-ust-java |
a4c5d022 | 188 | A simple library that uses JNI to allow tracing in java programs. |
8844360e | 189 | See liblttng-ust-java/README for build instructions. |