Messages in this thread | | | Date | Mon, 14 Jul 2008 20:12:02 -0400 | From | Mathieu Desnoyers <> | Subject | LTTng 0.10 for kernel 2.6.26 |
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Hi,
I just released LTTng kernel tracer 0.10 for kernel 2.6.26. The new userspace markers now have a brand new package, which includes the linker script for x86 32 and 64 bits and example code and Makefile, available at : http://ltt.polymtl.ca/packages/markers-userspace-0.5.tar.bz2
As always, the kernel patches are available at : http://ltt.polymtl.ca/lttng/patch-2.6.26-0.10.tar.bz2
The userspace tracing control tool : http://ltt.polymtl.ca/lttng/ltt-control-0.49-14072008.tar.gz
The trace viewer : http://ltt.polymtl.ca/packages/lttv-0.10.0-pre13-27052008.tar.gz
There is currently limited userspace tracing support :
- It traces through a system call - It records a string taken from the syscall parameter to the kernel event "userspace_string". It's not as compact as the kernel binary format, but it "does the job" for now. Other type support are WIP. - The markers userspace object, linked with the binary, adds a section to describe the markers and new constructors/destructors to register the markers to the kernel. - It supports instrumentation of libraries and executables. - It is currently limited to activation of system-wide tracepoints. The easiest way to activate them is to have them registered when ltt-armalluser is executed. It will automatically find them through /proc and enable them system-wide. They will then be automatically activated for all new processes created which register these markers. - It is better to tell yourself to /proc/ltt to activate the named markers if you plan to run a program which has a short execution time, because they would have to be enabled before they are listed in /proc. See the ltt-armalluser script as an example; just put your own marker name instead.
Feedback is welcome.
See the version compatibility list for details : http://ltt.polymtl.ca/svn/ltt/branches/poly/doc/developer/lttng-lttv-compatibility.html And follow the quickstart guide for instructions about how to install and use the tools. http://ltt.polymtl.ca/svn/ltt/branches/poly/QUICKSTART
Mathieu
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