linux-kernel - Re: [RELEASE] LTTng 2.0 prerelease 1

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Date:	Tue, 26 Jul 2011 11:52:37 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	ltt-dev@...ts.casi.polymtl.ca
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RELEASE] LTTng 2.0 prerelease 1

* Mathieu Desnoyers (mathieu.desnoyers@...icios.com) wrote:
> 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.

FYI, the new bundle:
http://lttng.org/bundles/20110726/

contains lttng-modules-2.0-pre2 which fixes perf counters context
support: in pre1, using perf counters with multiple contexts, on a setup
with cpu hotplug enabled, sometimes caused kernel OOPS on trace session
destroy, because reallocation of context array could move these
addresses, but cpu hotplug notifier needs a fixed address. This is fixed
in lttng-modules-2.0-pre2.

Thanks,

Mathieu

> 
> New Features:
> 
> - LTTng 2.0 kernel modules build against a vanilla or distribution
>   kernel, without need for additional patches.
> - Produces CTF (Common Trace Format) natively,
>   (http://www.efficios.com/ctf)
> - Tracepoints, Function tracer, CPU Performance Monitoring Unit (PMU)
>   counters and kprobes support,
> - Integrated interface for both kernel and userspace tracing,
> - 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.
> 
> You can get a the current release "bundle" (recommanded set of packages)
> at the following URL:
> 
> http://lttng.org/bundles/20110725/
> 
> Refer to the README files for installation instructions and lttng-tools
> doc/quickstart.txt for usage information and examples.
> (http://git.lttng.org/?p=lttng-tools.git;a=blob_plain;f=doc/quickstart.txt)
> 
> Please note that the LTTng-UST 2.0 (user-space tracing counterpart of
> LTTng 2.0) is still in active development and not released yet. Only
> text-dump output of the binary traces is available at this moment
> through the Babeltrace tool (LTTV is not supported yet). Tracing from
> the "tracing" group currently produces traces owned by "root"; this
> known problem will be fixed in the next prerelease. This release has
> been tested on vanilla Linux kernels, Debian kernels, Ubuntu kernels,
> and Fedora kernels on the version range 2.6.38, 2.6.39 and 3.0 (on x86
> 32/64-bit, and powerpc 32-bit at the moment, build tested on ARM).
> 
> Feedback is welcome!
> 
> Thanks,
> 
> Mathieu
> 
> Project website: http://lttng.org
> Download link: http://lttng.org/lttng2.0
> 
> -- 
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com

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