Messages in this thread | | | Date | Fri, 11 Jul 2008 11:19:06 -0400 | From | Mathieu Desnoyers <> | Subject | LTTng 0.10-pre57 for linux 2.6.26-rc9 (with userspace tracing for x86) |
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Hi,
Here is a new release of LTTng for the 2.6.26-rc9 kernel, which introduces :
- The tracepoints infrastructure. - Architecture independent markers converted to tracepoints. - Re-introduction of userspace tracing, only for x86 for now. Allows to do boot-time tracing (such as tracing the init process). Adds 2 system calls : sys_marker (marker registration) and sys_trace (tracing per se). The type support is currently limited : strings are formatted in userspace and sent to the kernel for logging under the event "userspace_string". I am doing this simple implementation to get the feature in until I have time to think more carefully about namespacing issues, typing and 32/64 bits processes in 64 bits architectures.
Please consider this last feature experimental. Review and testing is welcome. The userspace linker script and library needed to perform userspace tracing, as well as some sample code and Makefile, are available in the svn repository at
http://ltt.polymtl.ca/svn/markers-userspace/
Ports of the linker script, kernel-api.h (which should be per-architecture) and of markers-userspace-x86.patch to other architectures are welcome.
As always, please follow the compatibility list and the quickstart guide located at :
http://ltt.polymtl.ca/svn/ltt/branches/poly/doc/developer/lttng-lttv-compatibility.html
http://ltt.polymtl.ca/svn/ltt/branches/poly/QUICKSTART
Mathieu
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