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Status of Embedded Linux

Read a detailed report of the Linux Symposium in Canada, covering conference overview, keynote speeches, technical talks, and important observations. Topics like Linux tracing systems, kernel updates, and strategies against patent trolls are discussed. Discover key insights and highlights from this event.

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Status of Embedded Linux

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  1. Linux Symposium Canada Live Report Status of Embedded Linux Tim Bird - CELF AG Chair

  2. Outline • Overview of Conference • Talks so far • Observations about event

  3. Overview of Conference • New Venue in Montreal • Montreal is a “big city” – busier that Ottawa • New venue is nice (not a dungeon) • Tuesday - Tracing mini-Summit • Wednesday • Jonathan Corbet Keynote • Technical talks • Thursday • OIN keynote by Keith Bergelt • Technical Talks

  4. Tracing Mini-summit • Presentations: • Implementing an LTTng trace viewer in Eclipse – Francois Choinard • Adding user-space tracepointing to GDB – Marc Khouzam • Report on Ftrace – Frederick Wiesbecker • SystemTap – Frank Eigler • History and status of Linux tracing – Christoph Hellwig • Panel: Requirements for Linux Tracing Systems • Most of the above, and me

  5. Tracing Issues Raised • Need to unify kernel infrastructure for tracepoint definition (and clock sources and ring buffer implementations) between LTTng and Ftrace • Issues with tracers in embedded • Clock source are often crummy • Many systems don’t handle host-target well (if at all) • Embedded platform support lags X86 • Memory/Performance/Storage constraints • Production platforms have limited I/O channels to extract trace data

  6. Jonathan Corbet Keynote • Status of Linux Kernel • Not slowing down, despite prediction of Andrew Morton • Last year - 54000 change sets • Status of lots of individual features • FS - BTRFS, SquashFS, NILFS • SSD’s soon capable of 100K ops/second • Networking – mostly done but big iptables churn coming • RT – maybe last bits will get merged • Security – TOMOYO, Integrity measurement

  7. Wednesday Talks • Programmatic kernel crash dump analysis tools • Fedora BOF • GStreamer on TI OMAP35x chips • Sandboxer – lightweight application isolation for MIDs • Combined tracing of kernel and user-space with LTTng • Function Duration tracing with Ftrace (by me)

  8. Thursday Keynote • “Keeping Open Source Open” • Keith Bergelt of Open Invention Network • Very interesting talk about fighting patent trolls • There are some well-known trolls • Microsoft starting to get aggressive • TomTom lawsuit • OIN helped lessen the damages

  9. Thursday Keynote (cont.) • OIN has several strategies to defend open source • Peer-to-patent = system to present prior art to patent office • Defensive publications = codify prior art before patents are granted • Patent portfolio, including active patent development • Important Note: • Microsoft is “prowling” Japan for more victims • Make sure your company calls OIN before doing any deals with Microsoft • kbergetl@openinventionnetwork.com • 1-347-721-8511 (24 hours)

  10. Thursday Talks • Dynamic Debug • Mainlined in 2.6.28 • To use: • Use prdebug() instead of printk() • Turn on CONFIG_DYNAMIC_DEBUG • cat debugfs control file to see list of debug points • echo <expr> into control file to turn on/off debug points • Examine kernel log buffer

  11. Thursday Talks (cont.) • Autotest • Nice automated test framework from Google • Overview • Web control interface • Server to control jobs • Clients on targets to perform jobs • Autotest client is in python • Communication with client is via SSH • Handles failures, logging, reporting, etc

  12. Android BOF • Looking forward to this tomorrow

  13. Observations • Attendance is down (~300) • Important community members still attend (maybe fewer than previous years) • Christoph Hellwig • Jon Masters • James Bottomley • Tim Riker • Sessions are good

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