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Embedded Linux BOF

Embedded Linux BOF. Tim Bird Software Engineer, Sony Electronics Chair, CE Linux Forum Architecture Group. Embedded Linux Stuff. Year in Review Shameless plug Embedded Linux wiki Lightning talks. Year in Review. Real-time Size Bootup Time Audio/Video/Graphics Security

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Embedded Linux BOF

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  1. Embedded Linux BOF Tim Bird Software Engineer, Sony Electronics Chair, CE Linux Forum Architecture Group CE Linux Forum Members Confidential

  2. Embedded Linux Stuff • Year in Review • Shameless plug • Embedded Linux wiki • Lightning talks CE Linux Forum Members Confidential

  3. Year in Review • Real-time • Size • Bootup Time • Audio/Video/Graphics • Security • Power Management • Mobile Phone • Processor support • Tools CE Linux Forum Members Confidential

  4. Realtime • hrtimers (2.6.18?) • clock sources (2.6.18) • HR timer API • http://lwn.net/Articles/167315/ • ktimers explanation: • http://lwn.net/Articles/152436/ • Generic IRQ (2.6.18) • Tickless Idle coming CE Linux Forum Members Confidential

  5. Rt-Preempt • Mainline status • Most stuff in, “only” need: • sleeping spinlocks • threaded IRQs • Priority Inheritance (2.6.18) • http://lwn.net/Articles/177838/ • Latency tracer CE Linux Forum Members Confidential

  6. Size • Linux-tiny • Squashfs • Inode Slimming • Unit-at-a-time compilation • Size Testing • Bloatwatch • Config size testing CE Linux Forum Members Confidential

  7. Linx-tiny mainlining • small-8023.patch • fs_open-inlines.patch • inode-inlines.patch • fslocks-inline.patch • bloat-o-meter.patch • no-doublefault.patch • no-elf-core.patch • slob.patch • remove-vm86.patch • uid16.patch CE Linux Forum Members Confidential

  8. Inode Slimming Patches • brand new • july 3 - Ted Tso (not mainlined yet) • Tips: • Ted Tso - if you want to save memory taken up by in-core inodes, the first thing you should do is disable the debugging options; they are responsible for a huge amount of bloat in the VFS inode structure CE Linux Forum Members Confidential

  9. Unit-at-a-time Compilation • Ingo Molnar patch to utilize gcc 4 unit-at-a-time compilation • http://lkml.org/lkml/2005/12/28/68 • http://lwn.net/Articles/165354/ • inline reduction • New _always_inline_ attribute: • http://lwn.net/Articles/167315/ • http://lwn.net/Articles/165354/ CE Linux Forum Members Confidential

  10. Size Testing • Bloatwatch • http://testlab.celinuxforum.org/... • Config size testing • Presentation at CELF Project BOF CE Linux Forum Members Confidential

  11. Security • AppArmour • Lighter than SELinux • Good enough for embedded work?? • LSM in peril… CE Linux Forum Members Confidential

  12. Bootup Time • XIP - Execute in Place • Old info: http://lwn.net/Articles/135472/ • XAFS - new file system specifically for XIP • Jared Hulbert (Intel) posted for comments: • http://lwn.net/Articles/182337/ CE Linux Forum Members Confidential

  13. Power Management • User-space software suspend • Latest kerfluffle over suspend phases • Linus has posted a new patch, showing his method. • See lwn.net: http://lwn.net/Articles/189467 • Linux PM summit • http://lwn.net/Articles/181687 • Main issues: See PM BOF 19:00 Room A CE Linux Forum Members Confidential

  14. Audio/Video/Graphics • Big direct rendering update • http://lwn.net/Articles/167315/ • New CELF AVG Spec. (2.0) • DirectFB, ALSA, OpenGL/ES, UHAPI CE Linux Forum Members Confidential

  15. Mobile phone stuff • CELF specification still in-progress • More organizations than you can “shake a stick at”: • CELF MPPWG • OSDL MLI • LIPS • “the new one” CE Linux Forum Members Confidential

  16. Tools • Tracing • LTTgn just recently re-added lots of architecture support • LTTng, KFT, LKST - See Tracing BOF, 19:00 Room D • Memory Leak Tracker • Compilers • Thumb support CE Linux Forum Members Confidential

  17. Other • Function re-ordering • http://lwn.net/Articles/173657/ • GPL3 • “Nothing to see here, move along… CE Linux Forum Members Confidential

  18. News from the Kernel Summit • LSM stays for now • suspend/resume still messed up • no transparent super-pages • Kernel leaders sympathetic to size issue • other stuff?? CE Linux Forum Members Confidential

  19. Shameless plug • CELF Project BOF • Friday night, 7:00 pm, Les Suites • CELF Test Lab demo • Config size testing • CABI CPU resource reservation • Japan Jamboree update • Technical showcase CE Linux Forum Members Confidential

  20. Embedded Linux Wiki • Place to store info on embedded Linux • Starter material from CELF wiki • Paid maintenance, to avoid wiki rot • CELF may fund, if plan looks good and there’s community interest • BOF this week to discuss CE Linux Forum Members Confidential

  21. Lightning talks • 2 minutes (max) • what are you doing? / what is the issue? when will you publish!? • make it quick and to-the-point • where to go for more info… CE Linux Forum Members Confidential

  22. Lightning topics CE Linux Forum Members Confidential

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