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diff --git a/docs/elinux.org_Kernel_Size_Reduction_Work.txt b/docs/elinux.org_Kernel_Size_Reduction_Work.txt new file mode 100644 index 0000000..81d7130 --- /dev/null +++ b/docs/elinux.org_Kernel_Size_Reduction_Work.txt @@ -0,0 +1,292 @@ + #[1]eLinux.org (en) [2]eLinux.org Atom feed + +Kernel Size Reduction Work + + From eLinux.org + Jump to: [3]navigation, [4]search + + This page has a list of of recent (as of 2014) ideas and projects for + Linux kernel size reduction. + + As of June, 2014, [5]Linux Tiny was no longer maintained. However, new + efforts to support Linux as a viable option on micro-controllers and + deeply embedded systems have led to renewed interest in extreme size + reduction of the kernel. Some good projects were described at ELC 2014. + +Contents + + * [6]1 Recent work + * [7]2 List of recently used techniques + + [8]2.1 Vitaly Wool's project + + [9]2.2 micro-yocto project + o [10]2.2.1 instrumentation + + [11]2.3 auto-reduce + + [12]2.4 Kernel string refactorization + * [13]3 Ideas for new reductions + * [14]4 People or groups interested in size reductions + + [15]4.1 individuals + + [16]4.2 companies + * [17]5 Meetings and Discussions + + [18]5.1 Kernel Summit 2014 + + [19]5.2 Size/IOT summit at ELC Europe 2014 + +Recent work + + * Tom Zanussi and the Micro-yocto project (2014) + + Micro-Yocto is an effort in the Yocto Project to produce a + minimal kernel for very small embedded systems + + [20]microYocto and the Internet of Tiny (PDF) - Presentation + by Tom Zanussi at ELC 2014 + + See + [21]https://github.com/tzanussi/meta-galileo/raw/daisy/meta-ga + lileo/README for more information + * Vitaly Wool described running 2.6.33 on an ST microcontroler with + 2MB flash and 256K ram (2014) + + [22]Linux for Microcontrollers: Spreading the Disease (PDF) - + presented at ELC in April 2014 + +List of recently used techniques + +Vitaly Wool's project + + * kernel XIP + * dietnet + * ARM thumb mode + * application XIP on squashfs + +micro-yocto project + + * net-diet + * LTO + * SYSFS_SYSCALL + * USELIB + * BUG_ON + * X86_IOPORT + * CONFIG_PTRACE + * CONFIG_SIGNALS + * no sys_sendfile + + * network reductions: + + replace kernel stack with user-space stack (LWIP) + + TCP/UDP echo (requires app changes) + +instrumentation + + microYocto tracing hash triggers + +auto-reduce + + * LTO + * syscall filtering + * command line filtering + * global constraints + * kernel stack size + +Kernel string refactorization + + * refactor strings in the kernel so that they are more efficiently + used + * here is a [23]report on this work getting started + +Ideas for new reductions + + * trace-guided optimization + * cold code compression + + use U of Gent code to re-try cold code compression + +People or groups interested in size reductions + +individuals + + * Josh Triplett - e-mail:josh at joshtriplett dot org + + new linux tiny patches + * Tom Zanussi - e-mail: tom dot zanussi at linux dot intel dot com + + microYocto + * Andi Kleen - e-mail: ak at linux dot intel dot com + + netdiet patches + * Alan Cox - email: alan dot cox at linux dot intel dot com + * Shinsuke Kato - e-mail: kato dot shinsuke at jp dot panasonic dot + com + * Tim Bird - e-mail: tim dot bird at sonymobile dot com + + auto-reduce stuff + * Vitaly Wool - e-mail: vitaly dot wool at softprise dot net + + extreme microcontroller Linux (<256K RAM) + * Phil Blundell - e-mail: + + meta-micro (OE-based small distro - last work in 2012) + +companies + + * [24]Emcraft Systems sells a variety of microcontroller-based boards + and products + +Meetings and Discussions + +Kernel Summit 2014 + + Josh Triplett has proposed a session discussing size issues at the 2014 + Kernel Summit. His draft list of proposed topics was the following: + Topics: + * An overview of why the kernel's size still matters today ("but + don't we all have tons of memory and storage?") + * Tiny in RAM versus tiny on storage. + * How much the kernel has grown over time. + * How size regressions happen and how to avoid them + * Size measurement, bloat-o-meter, allnoconfig, and other tools + * Compression and the decompression stub + * Kconfig, and avoiding excessive configurability in the pursuit of + tiny + * Optimizing a kernel for its exact target userspace. + * Examples of shrinking the kernel + * Discussion on proposed ways to make the kernel tiny, how much they + might save, how much work they'd require, and how to implement them + with minimal impact to the un-shrunken common case. + + (see + [25]http://lists.linuxfoundation.org/pipermail/ksummit-discuss/2014-May + /000001.html for the discussion thread) + +Size/IOT summit at ELC Europe 2014 + + We are considering holding a Size/IOT meeting at ELC Europe. Details + will be placed here should this meeting end up being organized. + Retrieved from + "[26]https://elinux.org/index.php?title=Kernel_Size_Reduction_Work&oldi + d=415441" + [27]Category: + * [28]System Size + +Navigation menu + +Personal tools + + * [29]Log in + * [30]Request account + +Namespaces + + * [31]Page + * [32]Discussion + + [ ] + +Variants + +Views + + * [33]Read + * [34]View source + * [35]View history + + [ ] + +More + +Search + + ____________________ Search Go + +Navigation + + * [36]Main Page + * [37]Community portal + * [38]Current events + * [39]Recent changes + * [40]Help + * [41]Volunteering + +Where else to find us + + * [42]Mastodon + * [43]Discord + * [44]Twitter (@elinux) + * [45]#elinux on Libera.Chat + * [46]Facebook (@elinux.org) + * [47]Mailing Lists + * [48]Matrix + +Tools + + * [49]What links here + * [50]Related changes + * [51]Special pages + * [52]Printable version + * [53]Permanent link + * [54]Page information + + * This page was last edited on 26 July 2016, at 08:54. + * Content is available under [55]a Creative Commons + Attribution-ShareAlike 3.0 Unported License unless otherwise noted. + + * [56]Privacy policy + * [57]About eLinux.org + * [58]Disclaimers + + * [59]a Creative Commons Attribution-ShareAlike 3.0 Unported License + * [60]Powered by MediaWiki + +References + + Visible links: + 1. https://elinux.org/opensearch_desc.php + 2. https://elinux.org/index.php?title=Special:RecentChanges&feed=atom + 3. https://elinux.org/Kernel_Size_Reduction_Work#mw-head + 4. https://elinux.org/Kernel_Size_Reduction_Work#p-search + 5. https://elinux.org/Linux_Tiny + 6. https://elinux.org/Kernel_Size_Reduction_Work#Recent_work + 7. https://elinux.org/Kernel_Size_Reduction_Work#List_of_recently_used_techniques + 8. https://elinux.org/Kernel_Size_Reduction_Work#Vitaly_Wool.27s_project + 9. https://elinux.org/Kernel_Size_Reduction_Work#micro-yocto_project + 10. https://elinux.org/Kernel_Size_Reduction_Work#instrumentation + 11. https://elinux.org/Kernel_Size_Reduction_Work#auto-reduce + 12. https://elinux.org/Kernel_Size_Reduction_Work#Kernel_string_refactorization + 13. https://elinux.org/Kernel_Size_Reduction_Work#Ideas_for_new_reductions + 14. https://elinux.org/Kernel_Size_Reduction_Work#People_or_groups_interested_in_size_reductions + 15. https://elinux.org/Kernel_Size_Reduction_Work#individuals + 16. https://elinux.org/Kernel_Size_Reduction_Work#companies + 17. https://elinux.org/Kernel_Size_Reduction_Work#Meetings_and_Discussions + 18. https://elinux.org/Kernel_Size_Reduction_Work#Kernel_Summit_2014 + 19. https://elinux.org/Kernel_Size_Reduction_Work#Size.2FIOT_summit_at_ELC_Europe_2014 + 20. https://elinux.org/images/5/54/Tom.zanussi-elc2014.pdf + 21. https://github.com/tzanussi/meta-galileo/raw/daisy/meta-galileo/README + 22. https://elinux.org/images/c/ca/Spreading.pdf + 23. https://elinux.org/Refactor_kernel_strings_-_Results + 24. http://www.emcraft.com/ + 25. 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