[ltt-dev] [ANNOUNCEMENT] LTTng development roadmap, snapshot 20110116

Mathieu Desnoyers mathieu.desnoyers at efficios.com
Mon Jan 17 00:49:37 EST 2011


I just released a development snapshot of the current LTTng so those interested
can start building it in various configurations. The targets of this
development phase were as follows:

1) The size of the kernel patchset has been shrinked for Linux distributions by
   removing all LTTng-specific instrumentation from the tree.

2) The lttng-modules package now implements an ABI based on anonymous file
   descriptors (inspired from perf) rather than the full-blown VFS tree the
   previous LTTng versions were implementing.

3) lttng-modules now exports trace data and metadata in the CTF (Common Trace

4) lttng-modules now uses the Generic Ring Buffer Library.

The kernel tree snapshot is available as a tarball at:

The kernel patchset contains the following subdirectories:

trace-event-merged/                (3 patches, merged in the tracing tree)
 5 files changed, 22 insertions(+), 17 deletions(-)

trace-event-semicolon-removal/     (29 patches)
 37 files changed, 730 insertions(+), 662 deletions(-)

trace-event-assign-macros/         (8 patches)
 10 files changed, 251 insertions(+), 223 deletions(-)

trace-clock/                       (19 patches)
 60 files changed, 2750 insertions(+), 216 deletions(-)

lib-ring-buffer/                   (9 patches)
 34 files changed, 6635 insertions(+), 71 deletions(-)

lttng/                             (3 patches)
 3 files changed, 11 insertions(+), 1 deletion(-)

lib-ring-buffer-improvements/      (7 patches)
 12 files changed, 279 insertions(+), 14 deletions(-)

The LTTng kernel patchset is needed to build the current lttng-modules git tree
(a kernel module package). To fetch it:

git clone git://git.lttng.org/lttng-modules.git
(.c and .h files:   3170 lines total)

I currently have only a rather basic test program to interface with the new ABI
(available at http://lttng.org/files/lttng/test-lttng-ioctl.c), but I am
planning to work on the new strace-like command line program within the next
weeks (note: the location of the debugfs LTTng file will very likely change).
The objective is to create one single command-line tool to control both the
LTTng kernel tracer and the UST user-space tracer.



Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.

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