2011年1月17日

[ANNOUNCEMENT] LTTng development roadmap, snapshot 20110116

Hi,

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
Format).

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


The kernel tree snapshot is available as a tarball at:
http://lttng.org/files/lttng/patch-2.6.37-lttng-dev-snapshot-20110116.tar.bz2

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.

Thanks,

Mathieu

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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投稿者 xml-rpc : 2011年1月17日 14:49
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