LTTng

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LTTng ( Linux Trace Toolkit: next generation ) is a system software package for correlated tracing of the Linux kernel , applications and libraries. The project was originated by Mathieu Desnoyers with an initial release in 2005. Its predecessor is the Linux Trace Toolkit .

LTTng uses the Tracepoint instrumentation of the Linux kernel , as well as various other information sources such as kprobes , and the Perf performance monitoring counters.

Designed for minimal performance impact and having a near-zero impact when not tracing, it is useful for debugging a wide range of bugs that are otherwise extremely challenging.

Features [ edit ]

The challenging problems traceable with LTTng include, for example, performance problems on parallel systems and on real-time systems.

Custom instrumentation is easy to add.

Structure [ edit ]

LTTng consists of kernel modules (for Linux kernel tracing) and dynamically linked libraries (for application and library tracing). ^[1] It is controlled by a session daemon, which receives commands from a command line interface, lttng . The Babeltrace project allows translating traces into a human-readable log, and provides a trace reading library, libbabeltrace .

Deployment [ edit ]

LTTng is available as a set of packages. ^[2]

LTTng has at least basic support for all Linux -supported architectures (see the LTTng-modules README file for more details) as well as support for FreeBSD ^{[ citation needed ]} .

Major users include Google , IBM , Autodesk , Siemens , Nokia , Sony and Ericsson . It is included in Wind River Workbench, Mentor Graphics Mentor Embedded Linux, ELinOS embedded Linux, MontaVista Mobilinux 5.0, STLinux and SUSE Linux Enterprise Real-Time Linux distributions. Once collected, multiple solutions exist to process and visualize LTTng trace data (kernel and userspace) such as the open-source LTTV viewer, Eclipse Trace Compass ^[3] or commercial tools such as Mentor Graphics ' Sourcery Analyzer and Percepio Tracealyzer. ^[4]

LTTng-modules, LTTng-UST, LTTng-tools and Babeltrace are actively developed by an open community.

See also [ edit ]

• Kernel marker
• SystemTap
• strace
• DTrace

Further reading [ edit ]

• LTTng, Filling the Gap Between Kernel Instrumentation and a Widely Usable Kernel Tracer
• LTTng: Tracing across execution layers
• Tracing for HardWare, Driver, and Binary Reverse Engineering in Linux

References [ edit ]

External links [ edit ]

• Official website
• LTTng git repositories
• MontaVista Linux Platform Development Kit 5.0 datasheet
• On the value of static tracepoints