1. LTTng Integration
Eclipse Linux Tools
francois.chouinard@ericsson.com

2. Introduction
› About tracing
› Troubleshooting technique
› Record information about program execution
› Typically low­level, high­volume data logging
› Challenges
› Efficiency – low overhead
› Storage – trace data can become huge in no time
› Correlation – traces from multiple sources/layers/threads
› Analysis – make sense out of the deluge of data
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3. LTTng
› Linux Tracing Toolkit (lttng.org)
› Efficiency
› Low impact, high performace tracing system (~2% overhead)
› Support for conditional tracing
› Highly optimized static tracing (compile time)
› Dynamic tracing (kprobes)
› Storage
› Highly optimized binary storage format (for compactness)
› Self­describing trace format
› Various tracing modes:
› Write­to­disk
› Flight recorder
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4. LTTng
› Correlation
› Timestamped trace events (cycle counter precision ~1ns)
› Accurate event ordering across traces
› Analysis
› Numerous analysis views (see lttng.org)
› Other features
› Support for many processor types and Linux architectures
› Support for kernel and user­space tracing
› Support for very large traces (> 10GB)
› and much more (see lttng.org)
© Ericsson | EclipseCon 2010

5. LTTng
› Upcoming features
› Remote streaming
› Online monitoring
› Eclipse­based UI (that's why you are here)
› Structure
› Instrumented kernel (set of patches)
› lttd – logging daemon
› lttctl – user­space control
› Host­based UI
© Ericsson | EclipseCon 2010

6. LTTng Overview
Host Target
C/C++ App Java App Whatever
LTTng C adapter C adapter
libust libust libust
TMF
libustd libustctl
RSE/TCF TCF Agent lttd lttctl
Eclipse
Kernel Space
Patched
Shell cmd Local FS
Kernel
© Ericsson | EclipseCon 2010

7. Eclipse Integration
› LTTng Control
› Configuration and control of tracing
› RSE/TCF based
› Data Collection and Transfer
› Trace data retrieval
› Live streaming (under development)
› Monitoring (under development)
› RSE/TCF based
› Analysis
› Kernel State System (completely re­designed)
› Data Visualization
› LTTng perspective
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8. LTTng Perspective
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9. Demo
› Project View
› Importing an LTTng trace
› Creating an experiment
› Time Frame View
› Events View
› Statistics View
› Control Flow View
› Resources View
© Ericsson | EclipseCon 2010

10. Upcoming Features
› Helios Timeframe (June 2010)
› Feature parity with LTTV
› Control View
› Histogram View
› Multi­trace analysis
› User­space tracing
› By year­end (famous last words :­)
› Multi­traces synchronization
› More generic statistical analysis (for UST)
© Ericsson | EclipseCon 2010

11. Pointers
› LTTng Eclipse Project (http://www.eclipse.org/linuxtools/projectPages/lttng)
› LTTng Eclipse Wiki (http://wiki.eclipse.org/Linux_Tools_Project/LTTng)
› Linux Tools (http://www.eclipse.org/linuxtools/index.php)
› Update Site (http://download.eclipse.org/technology/linuxtools/update)
› LTTng Project (http://lttng.org)
› Tracing Wiki (http://lttng.org/tracingwiki/index.php/TracingBook)
© Ericsson | EclipseCon 2010

12. © Ericsson | EclipseCon 2010