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Difference between revisions of "Technology Watch List"

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(Tracing and instrumentation)
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|KTimers                                        ||mainlined||
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|KTimers                                        ||mainlined, but needs lots of porting to embedded architectures||??
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|Adding clock driver support for various architectures is an ongoing process
 
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|RT-preempt                                    ||some parts mainlined (last part was high res. timers in 2.6.21) ||2.6.21? || Next target is to integrate threaded interrupts in 2.6.23?? Threaded interrupt still not in 2.6.25
 
|RT-preempt                                    ||some parts mainlined (last part was high res. timers in 2.6.21) ||2.6.21? || Next target is to integrate threaded interrupts in 2.6.23?? Threaded interrupt still not in 2.6.25

Revision as of 19:52, 2 July 2008

This page lists technologies and projects that CELF members are interested in the status of. This includes kernel patches, new technology research, and middleware and user-space projects of key interest for consumer electronics products. The projects may be the topics of discussion at CELF meetings, and we plan to watch and report the status of these technologies.

Please add any information you have about the technology items listed below!!

Latest Watchlist

The Status field in the table below indicates whether this feature is on track for being mainlined. The When was last activity field indicates the kernel version number or date when the last activity was noted for this feature. This could be the last kernel version where bits from this patch were mainlined, or the last date of visible feature development activity outside the main tree.


Kernel Stuff

Size Stuff

Technology, Feature or Patch Status When was last activity Notes
Linux-tiny In active maintenance. Path set published for 2.6.24 Latest full patchset was published Oct. 13, 2007, Latest patch (CONSOLE_TRANSLATIONS) was mainlined in June 2008 Maintainer is Michael Opdenacker (with help from Thomas Petazzoni). See Linux Tiny Patch Details for details about the patch status.
kpagemap - memory instrumentation mainlined in Feb, 2008 (for 2.6.25) Feb 2008
Bloatwatch (2.0) Now actively reporting kernel sizes April 2008 See Matt's presentation from ELC 2008
gcc -ffunction-sections -fdata-sections Patches submitted to LKML July 2008 See Function sections

File Systems

Technology, Feature or Patch Status When was last activity Notes
Squash Fs Latest release is 3.3, released Feb 5, 2008 (See Squashfs 3.3 released. Not mainlined. CELF is attempting to fund another mainline attempt. Phillip is working on another mainline attempt. Sony is trying to help with the effort.
AXFS Not mainlined. Last mainline attempt was summer, 2007 Flash filesystem that allows for tuning the amount of XIP
LogFS Not mainlined. Last patches were published in March, 2008?
  • Home page is at: http://logfs.org/logfs/
  • Jörn Engel is working on a re-write to address several major issues.
  • CELF hired Jörn Engel in Dec, 2007 to complete and mainline a first release of logfs.
UBIFS not mainlined. Last submitted to mainlined in May 2008

Resources:

Tracing and instrumentation

Technology, Feature or Patch Status When was last activity Notes
LTTng core not mainlined. Markers were mainlined in 2.6.24 ? LTTng instrumentation was changed to use markers, in early 2007
SystemTap (and Kprobes) for non-i386 arches ARM support merged for 2.6.25 ? KProbes ports for ARM, MIPS and PPC32 were reported on at ELC 2007, SystemTap for SH was demo'ed at ELC 2007
Kernel Function Trace (KFT) not mainlined Last published patches for 2.6.22 Nicholas McGuire was taking over maintainership from Tim Bird, with funding from CELF. Haven't heard much recently (as of June 2008)
ftrace not mainlined version 16 of the patches was submitted by to LKML by Ingo Molnar in June, 2008 This was formerly the latency-trace features from the RT-preempt patch set, refactored for general use
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

Realtime

Technology, Feature or Patch Status When was last activity Notes
KTimers mainlined, but needs lots of porting to embedded architectures ?? Adding clock driver support for various architectures is an ongoing process
RT-preempt some parts mainlined (last part was high res. timers in 2.6.21) 2.6.21? Next target is to integrate threaded interrupts in 2.6.23?? Threaded interrupt still not in 2.6.25

Security

Technology, Feature or Patch Status When was last activity Notes
App Armour not mainlined May, 2007 Some kernel developers still have objections to path-based securityBRLWN.net mention App Armour
TOMOYO Linux not mainlined Nov 17, 2007 (4th post) (trying now) "TOMOYO Linux has only recently surfaced on the wider mailing lists; its reception has not been entirely friendly. This project's developers have some work to do if they are (1) to get past the same obstacles which have slowed AppArmor, and (2) show that their project is sufficiently different from AppArmor to merit inclusion as yet another security framework." (from Linux Weather Forecast)
SMACK mainlined . . .

Power Management

Technology, Feature or Patch Status When was last activity Notes
powertop ? ? Recent work
PM QoS in 2.6.23-mm1 Oct '07 (see http://lesswatts.org) need Embedded folks to take a look and help define the interface, expand the features and raise issues from the embedded perspective.

Bootup Time

Technology, Feature or Patch Status When was last activity Notes
deferred module load ? ?  ?
snapshot boot ?  ?  ?

Miscellaneous

Technology, Feature or Patch Status When was last activity Notes
Userspace I/O Seems to be merged into mainline (see: http://lwn.net/Articles/242483/ ) July, 2007 References: http://www.kroah.com/log/linux/uio.html

Middleware

Project Status When was last activity Notes
libdlna Developer has added support for all profiles except MPEG-4 and WMV ( http://hg.geexbox.org/libdlna/ ) 29 Aug, 07 Short term goal is to provide DLNA support to Ushare media server, long term goal is to provide generic DLNA reference library BR References: http://libdlna.geexbox.org/