Japan Technical Jamboree 16

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Aug. 31, 2007

Notice / お知らせ

NOTE: This is a paste of the content of the internet archive snapshot for this page from the old tree.celinuxforum.org wiki:

Introduction The Japan Technical Jamboree is a forum-wide technical meeting of the CE Linux Forum. This meeting will be located conveniently in Japan and use Japanese as the native language of the event. Attendance is not limited to the CELF members, but is open to all. Everyone who is interested in embedded Linux technologies is welcomed. There is no admission fee. A general guidance page is available. JapanTechnicalJamboreeGuidance (Japanese/English)

Coordinators: (Your inquiries in English welcome). Hisao Munakata (munakata.hisao(a)renesas.com) Satoru Ueda (Satoru.Ueda(a)jp.sony.com) 前回のWiki / Previous Jamboree Wiki Page JapanTechnicalJamboree15

今回のハイライト / Main session 国際的な視野に立って・・・ / International View Point 今回はアーキテクチャグループチェアのティム・バードが参加します。国際的な視点から組込み関係のオープンソース開発に関する状況をレビューします。 Tim Bird (CELF Architecture Group Chair) will join the discussion. He will overview curreent status of embedded system related OSS development. Table Of Contents Contents

Introduction Coordinators: (Your inquiries in English welcome). 前回のWiki / Previous Jamboree Wiki Page 今回のハイライト / Main session Table Of Contents Date and Place Registration 進行の目安 / Agenda Discussion Items Special Session Open Source Patch and Feature Watch General Session Project Update Session デモンストレーション / Demonstration はじめて参加される方に(For Newcomers) お知らせ / Notice

Date and Place 8月31日(金) / August 31st (Fri), 2007

From 10:00am to 6pm(会議室は9時まで予約してあります/ Meeting room booked until 9 pm.) Venue

Nakano Sun Plaza

Homepage (Japanese)

English page is not available, however it is very easy to access. Just near by of "Nakano" station, JR Chuo Line and Tokyo Metro (Subway) Tozai Line. The Nakano station is on the Chuo main line, west of Shinjuku station. Here is a Japan Railways map of the Tokyo area

場所:中野サンプラザHomepage Location: Nakano Sun Plaza

JR中央線・東京メトロ東西線中野駅北口すぐ Good News!: この会場ではインターネットへのフリーアクセスが可能です。当日はWireless LANを設置します。(Free access to the Internet is available. Wireless Lan will be set up on the day.)

電源延長ケーブルをお持ちの方はご持参ください。(Come with your AC power extension cable if possible) 楽な服装でどうぞ。 Registration 参加登録は、こちらのページから。

/!\ 参加登録は大まかな参加人数把握のためにお願いしています。入力をされても確認メールは発信されません。

Registration site is here.

進行の目安 / Agenda 時間 / Time

内容 / Session Title

資料 / Materials http://tree.celinuxforum.org/CelfPubWiki/JapanTechnicalJamboreeGuidance?action=AttachFile&do=get&target=call4Volunteer.gif


連絡事項・自己紹介 Opening notice / Self introduction


Open Discussion: Why we collaborate with community? 組込み機器開発に於けるOSS開発コミュニティー参加の意義(アンケートのお願い) - by S. Ueda (Sony)



組込み関連の最新OSS開発状況(LinuxTiny を中心に) Overview embedded system related OSS development (LinuxTiny and so on) - by Tim Bird (Sony / CELF AG Chair) /!\ In English

State_of_Embedded_Linux-Jamboree16.pdf See also http://elinux.org/Linux_Tiny





コミュニティでのカーネル開発活動(2)/ Kernel development in the Community (2) Dev process, kernel newbies, git - by Tsugikazu Shibata (NEC)


Summarizing Dynamic linking, part 3 Session for beginers by Tetsuyuki Kobayashi (Aplix)

dynamiclink_3_20070828.ppt (Japanese) dynamiclink_3_20070828_en.ppt (english)


Recent new features in NPTL 色々なMutex紹介 と 活用評価(プロセス間同期など) by Hiroki Kumagai (Toshiba)

celf_nptl.pdf (Japanese) Jamboree16Nptl (english/text)


OProfile porting on MIPS architecture by Takehiko Nagano (Hitachi)

20070831OProfile_porting.pdf (Japanese) Jamboree16OprofilePorting (english/text)


Compressed Cache : status and issues by Munehiro Ikeda (NEC)

ccache_celf_2007-08-31_jp.pdf (Japanese) Jamboree16Ccache (english/text) - patch : ccache_avoid-oom_v3.tar.bz2 - test progs : test_prgs.tar.bz2


Latest story about the PS3 Linux (Tentative) by Hiroyuki Machida (Sony)


My experience in posting patch to the community by Nakamura san (Hitachi Software)

20070831CELF_patch.pdf (Japanese) 20070831CELF_Busybox.pdf (Japanese) JapanJamboree16SeBusybox (english/text)


Lightning Sessions 飛び入りトークの時間です!

bootchart-lite-jp.pdf bootchart-lite-en.pdf


Patches review / Review and discussion of the latest patches related to embedded systems (see KernelPatchAndFeatureWatchlist)

KFTStatusOnPowerPC_20070831.pdf by T.Owa (Toshiba) (English)

Schedule may be delay and to be flexible because of many items are expected to be added. CELF-TJ16-memo-ja.txt (Japanese) <= Meeting memo by T.Ishizaki(Panasonic).

Discussion Items We are now calling for discussion items. Please feel free to send your subject to the coordinators! Special Session We are calling for the discussion items!

Open Source Patch and Feature Watch Let's talk about the recent patch and feature added which we have to pay attention. KernelPatchAndFeatureWatchlist

As of 29th August: Patch or Feature


When was last activity



some sub-patches mainlined, 86 outstanding, 63 bit-rotted relative to 2.6.21

patches published for 2.6.14

Some discussion at OLS 2007 about new maintainer.


not mainlined


last mainline attempt was over a year ago






Not mainlined yet. In active development with patches submitted to LKML


Reported to still be not-ready-for-prime-time; could offer significant memory gains for embedded flash-based systems


core not mainlined (what about markers??)


LTTng instrumentation bits were changed to use markers, in early 2007

SystemTap (and Kprobes) for non-i386 arches

no embedded arch support mainlined yet


KProbes ports for ARM, MIPS and PPC32 were reported on at ELC 2007, SystemTap for SH was demo'ed at ELC 2007

pagemap instrumentation

currently in -mm, targetted for 2.6.23?

July 2007

Matt Mackall was fixing a lock contention bug (as of July 2007)

KFT (Kernel Function Trace)

not mainlined - broken on ARM (with gcc > 4.x), PPC64 has problems (reports parent funcs of inlines)

last published external patches for 2.6.21

working to transfer maintainership of this from Tim Bird to Nicholas McGuire

printk-times (arch support)

fully mainlined?

April, 2005

Some arches had problems with accessing the clock too early in the kernel bootup sequence, but a new setup routine defers turning on the timestamping until after timekeeping is initialized


some parts mainlined (last part was high res. timers in 2.6.21)


Next target is to integrate threaded interrupts in 2.6.23??

App Armour

not mainlined

May, 2007

Some kernel developers still have objections to path-based security


not mainlined

2nd LKML posting Aug, 2007

Some kernel developers still have objections to path-based security




ACPI version available; reported to be portable to non-Intel architectures, but no attempt known

B) [NEW] Userspace I/O

Seems to be merged into mainline (see: http://lwn.net/Articles/242483/ )

July, 2007

Lets pay attention! References: http://www.kroah.com/log/linux/uio.html

B) [NEW] Kernel How To (Japanese and Chinese translation)

Seems to be merged into mainline

July, 2007

Lets pay attention! Originally written by Greg KH

General Session We are calling for the discussion items!

Project Update Session We are calling for the discussion items!

デモンストレーション / Demonstration デモンストレーションも歓迎します。 We welcome your technical demonstration. はじめて参加される方に(For Newcomers) ガイダンスページがあります。JapanTechnicalJamboreeGuidance (Guidance page has been prepared. Hope it helps.)

The next Japan Jamboree

Japan Technical Jamboree 17

Other Jamboree Wiki pages on the CELF site