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What is LTS & LTSI kernel ? BSP development w/LTSI kernel Conclusion and Resources LTSI project update (2015 fall editoin) How to choose the best kernel for your embedded system Hisao Munakata LTSI Project @ Linux Foundation, CE working

  1. What is LTS & LTSI kernel ? BSP development w/LTSI kernel Conclusion and Resources LTSI project update (2015 fall editoin) How to choose the best kernel for your embedded system Hisao Munakata LTSI Project @ Linux Foundation, CE working group October 5th 2015 1 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  2. What is LTS & LTSI kernel ? BSP development w/LTSI kernel Conclusion and Resources Who am I ? From embedded SoC provider company Renesas Responsible for OSS software development and delivery for R-Car series SoC Working with W/W car OEM and 1st tear IVI customers Linux Foundation CE 1 working Gr. Steering committee member, LF/CEWG Architecture Gr. co-chair One of LF/CEWG LTSI 2 project initial proposer At my company, I had been encouraging my team developers to send a patches upstream 1 CE = consumer electronics 2 LTSI =Long T erm Support Initiative 2 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  3. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) What is LTS & LTSI kernel ? 3 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  4. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) community longterm kernel 4 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  5. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Schedule based periodic kernel release record version release date duration v3.7 2012-12-10 71 days v3.8 2012-02-18 70 days v3.9 2013-04-28 69 days v3.10 2013-06-30 63 days v3.11 2013-09-02 64 days v3.12 2013-11-15 74 days v3.13 2014-01-21 67 days v3.14 2014-03-30 68 days v3.15 2014-06-08 70 days v3.16 2014-08-03 54 days v3.17 2014-10-05 63 days v3.18 2014-12-07 63 days v3.19 2015-02-08 62 days v4.0 2015-04-12 63 days v4.1 2015-06-21 70 days v4.2 2015-09-01 72 days 5 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  6. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Upstream kernel @kernel.org You can find 1)latest released, 2)under development (=mainline, next), and several stable kernels 6 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  7. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) upstream kernel maintenance (Stable and Longterm) https://www.kernel.org/category/releases.html 7 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  8. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Linux kernel life-cycle varies according to version 8 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  9. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) longterm kernel maintenance last longer than regular Greg Version maintenance status v3.7 maintained till 3.7.10, then now EOL v3.8 maintained till 3.8.13, then now EOL v3.9 maintained till 3.9.11, then now EOL v3.10 longterm stable (3.10.88), kept maintained √ v3.11 maintained till 3.11.10, then now EOL v3.12 longterm stable (3.12.47), kept maintained (by SUSE) v3.13 maintained till 3.13,11 then now EOL v3.14 longterm stable (3.14.52), kept maintained √ v3.15 maintained till 3.15.10, then now EOL v3.16 maintained till 3.16.7, then now EOL v3.17 maintained till 3.17.8, then now EOL v3.18 longterm stable (3.18.21), kept maintained (by Debian) v3.19 maintained till 3.19.8, then now EOL v4.0 stable release (4.1.9), till 4.2 release v4.1 next longterm stable version (4.1.7) √ 9 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  10. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Stable release include MUST APPLY essential fixes version fixes v3.7 -> v3.7.10 718 v3.8 -> v3.8.13 996 v3.9 -> v3.9.11 746 v3.10 -> v3.10.88 4,849 v3.11 -> v3.11.10 677 v3.12 -> v3.12.47 5,235 v3.13 -> v3.13.11 903 v3.14 -> v3.14.52 3,765 v3.15 -> v3.15.10. 703 v3.16 -> v3.16.7 871 v3.17 -> v3.17.8 884 v3.18 -> v3.18.21 2,114 v3.19 -> v3.19.8 873 v4.0 -> v4.0.9 757 v4.1 -> v4.1.7 697 Rule : document/stable_kernel_rules.txt -> 10 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  11. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Longterm stable (LTS) kernel release cadence T arget kernel selection rules Maintainer will choose one L TS version per year Maintain it for 2 years from its original release LTS-3.10 becomes EOL when LTS-4.1 is released Then, we have 2 LTS kernels versions like 3.14 and 4.1 11 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  12. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) LTSI kernel concept 12 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  13. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Creating common ground for embedded industry 13 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  14. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) LTSI mechanism helps SoC vender a lot LTSI kernel was the only option to backport mainlined code 14 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  15. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Seems some people confuse LTS and LTSI difference 15 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  16. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) LTSI Status Update (3.14 and 4.1) 16 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  17. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) LTSI 3.14 is the latest release @ January 9, 2015 17 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  18. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) LTSI 3.14 development history (result) item date kernel 3.14 merge window open 2014.1.19 kernel 3.14 merge window close 2014.2.2 kernel 3.14 release 2014.3.30 Announce of 2014 LTS kernel version 2014.5.20 (LinuxCon JP) LTSI-3.14 git tree created 2014.5.20 3.14 becomes LTS (=3.16 release) 2014.8.3 LTSI-3.14 merge window open 2014.8.23 patch collection period 84 days LTSI-3.14-rc1 (=merge window close) 2014.11.14 validation period 56 days LTSI-3.14 release 2015.1.9 18 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  19. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Greg.K.H announced next LTS is 4.1 and LTSI follow it 19 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  20. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) LTSI 4.1 development schedule (merge close soon) item date kernel 4.1 merge window open 2015.4.12 kernel 4.1 merge window close 2015.4.26 kernel 4.1 release 2015.6.21 Greg announced 4.1 is next LTS(I) LinuxCon NA 2015 LTSI-4.1 merge window open 2015.8.17 patch collection period 76 days LTSI-4.1 merge window close (target) 2015.10.31 validation period 50+ days LTSI-4.1 release (target) 2015.12.20 Compare to the previous, we adopted relatively fresh kernel 20 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

  21. What is LTS & LTSI kernel ? community longterm kernel BSP development w/LTSI kernel LTSI kernel concept Conclusion and Resources LTSI Status Update (3.14 and 4.1) Getting closer to the latest community kernel 21 / 46 Hisao Munakata LTSI project update (2015 fall editoin)

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