October 11, 2015CE Linux Forum Members Confidential 1 Embedded Linux BOF Tim Bird Software Engineer, Sony Electronics Chair, CE Linux Forum Architecture Group

October 11, 2015CE Linux Forum Members Confidential 2 Embedded Linux Stuff Year in Review Shameless plug Embedded Linux wiki Lightning talks

October 11, 2015CE Linux Forum Members Confidential 3 Year in Review Real-time Size Bootup Time Audio/Video/Graphics Security Power Management Mobile Phone Processor support Tools

October 11, 2015CE Linux Forum Members Confidential 4 Realtime hrtimers (2.6.18?) –clock sources (2.6.18) –HR timer API –ktimers explanation: Generic IRQ (2.6.18) Tickless Idle coming

October 11, 2015CE Linux Forum Members Confidential 5 Rt-Preempt Mainline status –Most stuff in, “only” need: sleeping spinlocks threaded IRQs Priority Inheritance (2.6.18) – Latency tracer

October 11, 2015CE Linux Forum Members Confidential 6 Size Linux-tiny Squashfs Inode Slimming Unit-at-a-time compilation Size Testing –Bloatwatch –Config size testing

October 11, 2015CE 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

October 11, 2015CE 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

October 11, 2015CE Linux Forum Members Confidential 9 Unit-at-a-time Compilation Ingo Molnar patch to utilize gcc 4 unit-at-a- time compilation – – inline reduction –New _always_inline_ attribute:

October 11, 2015CE Linux Forum Members Confidential 10 Size Testing Bloatwatch – Config size testing –Presentation at CELF Project BOF

October 11, 2015CE Linux Forum Members Confidential 11 Security AppArmour –Lighter than SELinux –Good enough for embedded work?? LSM in peril…

October 11, 2015CE Linux Forum Members Confidential 12 Bootup Time XIP - Execute in Place –Old info: –XAFS - new file system specifically for XIP Jared Hulbert (Intel) posted for comments: –

October 11, 2015CE 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: Linux PM summit – –Main issues: See PM BOF 19:00 Room A

October 11, 2015CE Linux Forum Members Confidential 14 Audio/Video/Graphics Big direct rendering update – New CELF AVG Spec. (2.0) –DirectFB, ALSA, OpenGL/ES, UHAPI

October 11, 2015CE 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”

October 11, 2015CE 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

October 11, 2015CE Linux Forum Members Confidential 17 Other Function re-ordering – GPL3 –“Nothing to see here, move along…

October 11, 2015CE 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??

October 11, 2015CE 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

October 11, 2015CE 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

October 11, 2015CE 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…

October 11, 2015CE Linux Forum Members Confidential 22 Lightning topics