[RELEASE] LTTng 2.0 Release Candidate 2

[RELEASE] LTTng 2.0 Release Candidate 2

[Mathieu Desnoyers]

LTTng, the Linux Trace Toolkit Next Generation, is a highly efficient
full system tracing solution toolchain. It is composed of several
components to allow tracing of the kernel, of userspace, trace viewing
and analysis and trace streaming. LTTng is open source software.

* Important compatibility note:

  In rc2, we had to add padding in the ABIs between applications
  TRACEPOINT_EVENT providers and liblttng-ust, and in the ring buffer ABI
  shared between lttng-ust and the lttng-tools consumer. Therefore,
  users upgrading to rc2 should recompile their tracepoint providers and
  upgrade both lttng-ust and lttng-tools to rc2.


We plan to release LTTng 2.0 final on March 20, 2012.

For the entire RC time-frame the latest packages under section "Download
Toolchain Source Packages" from the following URL should be used:

  http://lttng.org/lttng2.0

Project website: http://lttng.org
Download link: http://lttng.org/lttng2.0
(please refer to the README files for installation instructions and
lttng-tools doc/quickstart.txt for usage information)

Key Features:

- Efficient synchronized User-space and Kernel tracing using the same
  time-source provides view of correlated kernel and user-space events.
- LTTng 2.0 kernel modules build against a vanilla or distribution
  kernel, without need for additional patches,
- Tracepoints, detailed syscall tracing (fast strace replacement),
  CPU Performance Monitoring Unit (PMU) counters, dynamic address/symbol
  probing (kprobes) and function call/return tracing (kretprobes support),
- Have the ability to attach "context" information to events in the
  trace (e.g. any PMU counter, pid, ppid, tid, comm name, etc).
  All the extra information fields to be collected with events are
  optional, specified on a per-tracing-session basis (except for
  timestamp and event id, which are mandatory).
- Allows non-root users part of the "tracing" group to perform kernel
  and userspace tracing.
- Allows multiple tracing sessions to be active concurrently, each with
  its own instrumentation set.
- Integrated interface for both kernel and userspace tracing,
- Produces CTF (Common Trace Format) natively,
  (http://www.efficios.com/ctf)


-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com