|| ||Mathieu Desnoyers <firstname.lastname@example.org>|
|| ||email@example.com, firstname.lastname@example.org|
|| ||LTTng 0.10 for kernel 2.6.26|
|| ||Mon, 14 Jul 2008 20:12:02 -0400|
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 :
As always, the kernel patches are available at :
The userspace tracing control tool :
The trace viewer :
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
Feedback is welcome.
See the version compatibility list for details :
And follow the quickstart guide for instructions about how to install
and use the tools.
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