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1 | LTTng 2.0 modules |
2 | ||
3 | Mathieu Desnoyers | |
4 | July 19, 2011 | |
5 | ||
6 | LTTng 2.0 kernel modules build against a vanilla or distribution kernel, without | |
7 | need for additional patches. Other features: | |
8 | ||
9 | - Produces CTF (Common Trace Format) natively, | |
10 | (http://www.efficios.com/ctf) | |
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11 | - Tracepoints, Function tracer, CPU Performance Monitoring Unit (PMU) |
12 | counters and kprobes support, | |
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13 | - Integrated interface for both kernel and userspace tracing, |
14 | - Have the ability to attach "context" information to events in the | |
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15 | trace (e.g. any PMU counter, pid, ppid, tid, comm name, etc). |
16 | All the extra information fields to be collected with events are | |
17 | optional, specified on a per-tracing-session basis (except for | |
18 | timestamp and event id, which are mandatory). | |
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19 | |
20 | To build and install, you will need to have your kernel headers available (or | |
21 | access to your full kernel source tree), and use: | |
22 | ||
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23 | % make |
24 | # make modules_install | |
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25 | |
26 | If you need to specify the target directory to the kernel you want to build | |
27 | against, use: | |
28 | ||
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29 | % KERNELDIR=path_to_kernel_dir make |
30 | # KERNELDIR=path_to_kernel_dir make modules_install | |
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32 | Use lttng-tools to control the tracer. LTTng tools should automatically load |
33 | the kernel modules when needed. Use Babeltrace to print traces as a | |
34 | human-readable text log. These tools are available at the following URL: | |
35 | http://lttng.org/lttng2.0 | |
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36 | |
37 | Please note that the LTTng-UST 2.0 (user-space tracing counterpart of LTTng 2.0) | |
38 | is still in active development and not released yet. | |
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39 | |
40 | So far, it has been tested on vanilla kernels 2.6.38 and 2.6.39 (on x86 at the | |
41 | moment). It should work fine with newer kernels and other architectures, but | |
42 | expect build issues with kernels older than 2.6.36. The clock source currently | |
43 | used is the standard gettimeofday (slower, less scalable and less precise than | |
44 | the LTTng 0.x clocks). Support for LTTng 0.x clocks will be added back soon into | |
45 | LTTng 2.0. |