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02 June 2013
Desnoyers, Mathieu, Proving the Correctness of Nonblocking Data Structures. ACM Queue, 11 (5): 30-43 (2013).
15 April 2013
In the past, much effort has been invested in high performance kernel tracing tools, but now focus in the tracing community seems to be shifting over to efficient user space application tracing. By providing joint kernel and user space tracing, developers can have deeper insights in their applications latencies. This presentation covers the ongoing efforts within the LTTng project to enhance system-wide tracing at the user space level. It discusses instrumentation sources such as Tracepoints, Uprobes, and SystemTAP SDT providers, along with their integration with LTTng. A brief overview of the latest and upcoming features of the user space tracer is presented. It also discusses ongoing efforts in the area of trace format and control protocol standardisation. Finally, our presentation includes challenging glibc-related issues encountered during LTTng-UST development, opening the discussion on how to improve and collaborate on user-space instrumentation.
The targeted audience is user space and kernel developers, those interested in tracing infrastructure, shared system libraries, and application instrumentation.
30 August 2012
The Tracing Summit 2012 was held in San Diego, on August 30th, 2012, as part of the Linux Plumbers Conference 2012. It was organized by Mathieu Desnoyers (EfficiOS) and Dominique Toupin (Ericsson).
It focuses on the tracing area, gathering people involved in development and end-users of tracing tools as well as trace analysis tools. The main target of this one day conference is to provide room for discussion between people in the various areas that benefit from tracing, namely parallel, distributed and/or real-time systems, as well as kernel development.
30 August 2012
LTTngTop is a top-alike kernel trace viewer. It uses the LTTng trace format (CTF) as input and benefits from the whole kernel tracing infrastructure (tracepoints, kprobes, kretprobes and perf PMU counters). This tool uses the tracing information to represent the state of the kernel at any point in time. As of now it displays the CPU and I/O usage, as well as the performance (PMU) counters evolution associated with all processes. It also provides a detailed view for each process including the file descriptors opened and the amount of data read and written for each. This project is still in active development mode as live tracing is being included and more views are added progressively to suit the needs of developers and system administrators. After presenting the tool and its potential, the discussion will cover the future views and analysis that the Linux Plumbers would be most interested in.
30 August 2012
This presentation introduces new technologies and a common format allowing tracing of Linux systems at the software (hypervisor, kernel, user-space), and hardware levels. One major building block of CTF is the Trace Stream Description Language (TSDL) which flexibility enables description of various binary trace stream layouts. It enables tracing of Linux deployed on multi-core CPUs, interacting with DSPs, where each of these components exports its own trace streams. This presentation covers work on the the Common Trace Format (CTF) specification and its reference implementations: the Babeltrace trace converter, the LTTng 2.0 kernel tracer, and the LTTng-UST 2.0 (user-space tracer). This work has been realized in collaboration with Ericsson, the Multi-Core Association Tool Infrastructure Workgroup and the Linux Foundation Consumer Electronics Linux Forum (CELF) Workgroup.