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Subject[STATUS 2.5] April 25, 2002
The latest kernel 2.5 status update is available at
for your enjoyment.

As always, feedback welcome!

-- Guillaume

Kernel 2.5 status - April 25th, 2002
(Latest kernel release is 2.5.10)


o in 2.5.1+ Rewrite of the block IO (bio) layer (Jens
o in 2.5.2 Initial support for USB 2.0
(David Brownell, Greg Kroah-Hartman, etc.)
o in 2.5.2 Per-process namespaces, late-boot cleanups (Al
Viro, Manfred Spraul)
o in 2.5.2+ New scheduler for improved scalability (Ingo
o in 2.5.2+ New kernel device structure (kdev_t)
(Linus Torvalds, etc.)
o in 2.5.3 IDE layer update
(Andre Hedrick)
o in 2.5.3 Support reiserfs external journal
(Reiserfs team)
o in 2.5.3 Generic ACL (Access Control List) support
(Nathan Scott)
o in 2.5.3 PnP BIOS driver (Alan
Cox, Thomas Hood, Dave Jones, etc.)
o in 2.5.3+ New driver model & unified device tree
(Patrick Mochel)
o in 2.5.4 Add preempt kernel option
(Robert Love, MontaVista team)
o in 2.5.4 Support for Next Generation POSIX Threading (NGPT
o in 2.5.4+ Porting all input devices over to input API
(Vojtech Pavlik, James Simmons)
o in 2.5.5 Add ALSA (Advanced Linux Sound Architecture) (ALSA
o in 2.5.5 Pagetables in highmem support (Ingo
Molnar, Arjan van de Ven)
o in 2.5.5 New architecture: AMD 64-bit (x86-64) (Andi
Kleen, x86-64 Linux team)
o in 2.5.5 New architecture: PowerPC 64-bit (ppc64)
(Anton Blanchard, ppc64 team)
* in 2.5.5+ IDE subsystem major cleanup
(Martin Dalecki, Vojtech Pavlik)
o in 2.5.6 Add JFS (Journaling FileSystem from IBM) (JFS
o in 2.5.6 per_cpu infrastructure
(Rusty Russell)
o in 2.5.6 HDLC (High-level Data Link Control) update
(Krzysztof Halasa)
o in 2.5.6 smbfs Unicode and large file support
(Urban Widmark)
o in 2.5.7 New driver API for Wireless Extensions (Jean
o in 2.5.7 Video for Linux (V4L) redesign (Gerd
o in 2.5.7 Futexes (Fast Lightweight Userspace Semaphores)
(Rusty Russell, etc.)
o in 2.5.7+ NAPI network interrupt mitigation
(Jamal Hadi Salim, Robert Olsson, Alexey Kuznetsov)
o in 2.5.7+ ACPI (Advanced Configuration & Power Interface) (Andy
Grover, ACPI team)
o in 2.5.8 Syscall interface for CPU task affinity
(Robert Love)
o in 2.5.8 Radix-tree pagecache
(Momchil Velikov, Christoph Hellwig)
* in 2.5.8+ Support for IDE TCQ (Tagged Command Queueing) (Jens
* in 2.5.8+ Delayed allocation on write
(Andrew Morton)
* in 2.5.9 IRQ balancing (Ingo

o Pending Rewrite of the framebuffer layer
(James Simmons)
o in -ac Strict address space accounting (Alan
o in -ac PCMCIA Zoom video support (Alan
o in -ac More complete IEEE 802.2 stack
(Arnaldo, Jay Schullist, from Procom donated code)

o Ready Better event logging for enterprise systems
(Larry Kessler, evlog team)
o Ready New quota system supporting plugins (Jan
o Ready Replace old NTFS driver with NTFS TNG driver
(Anton Altaparmakov)
o Ready Linux booting ELF images (Eric
o Ready First pass at LinuxBIOS support (Eric
o Ready Build option for Linux Trace Toolkit (LTT)
(Karim Yaghmour)

o Beta New kernel build system (kbuild 2.5)
(Keith Owens)
o Beta Add support for CPU clock/voltage scaling (Erik
Mouw, Dave Jones, Russell King, Arjan van de Ven)
o Beta Serial driver restructure
(Russell King)
o Beta New IO scheduler (Jens
o Beta Add XFS (A journaling filesystem from SGI) (XFS
* Beta New VM with reverse mappings (Rik
van Riel)
o Beta Fix long-held locks for low scheduling latency
(Andrew Morton, Robert Love, etc.)
o Beta Add Linux Security Module (LSM) (LSM
o Beta Hotplug CPU support
(Rusty Russell)
o Beta Per-mountpoint read-only, union-mounts, unionfs (Al
o Beta EVMS (Enterprise Volume Management System) (EVMS
o Beta LVM (Logical Volume Manager) v2.0 (LVM
o Beta Dynamic Probes
(Suparna Bhattacharya, dprobes team)
o Beta Scalable CPU bitmasks (Russ
o Beta Page table sharing
(Daniel Phillips)
o Beta Rewrite of the console layer
(James Simmons)
o Beta ext2/ext3 online resize support
(Andreas Dilger)
o Beta Fast walk dcache
(Hanna Linder)
o Beta Add User-Mode Linux (UML) (Jeff
o Beta UDF Write support for CD-R/RW (packet writing) (Jens
Axboe, Peter Osterlund)
o Beta Add hardware sensors drivers
(lm_sensors team)
o Beta New kernel config system: CML2 (Eric
o Beta Read-Copy Update Mutual Exclusion
(Dipankar Sarma, Rusty Russell, Andrea Arcangeli, LSE Team)
* Beta USB device (not host) support
(Stuart Lynne, Greg Kroah-Hartman)

o Alpha Better support of high-end NUMA machines (NUMA
o Alpha Add Asynchronous IO (aio) support (Ben
o Alpha Overhaul PCMCIA support
(David Woodhouse, David Hinds)
o Alpha Full compliance with IPv6
(Alexey Kuznetzov, Jun Murai, Yoshifuji Hideaki, USAGI team)
o Alpha UMSDOS (Unix under MS-DOS) Rewrite (Al
o Alpha Scalable Statistics Counter
(Ravikiran Thirumalai)
o Alpha Linux Kernel Crash Dumps (Matt
Robinson, LKCD team)
o Alpha Add support for NFS v4 (NFS
v4 team)
o Alpha ext2/ext3 large directory support: HTree index
(Daniel Phillips, Christopher Li, Ted Ts'o)
o Alpha Delayed disk block allocation
(Andrew Morton)
o Alpha Improved i2o (Intelligent Input/Ouput) layer (Alan
o Alpha New MTRR (Memory Type Range Register) driver
(Patrick Mochel)
o Alpha Remove use of the BKL (Big Kernel Lock) (Alan
Cox, Robert Love, Neil Brown, Dave Hansen, etc.)
o Alpha Zerocopy NFS
(Hirokazu Takahashi)

o Started More complete NetBEUI stack
(Arnaldo Carvalho de Melo, from Procom donated code)
o Started Change all drivers to new driver model (All
o Started Reiserfs v4
(Reiserfs team)
o Started Move ISDN4Linux to CAPI based interface
(ISDN4Linux team)

o Draft #2 New lightweight library (klibc) (Greg
o Draft #3 Replace initrd by initramfs (H.
Peter Anvin, Al Viro)
o Planning Add thrashing control (Rik
van Riel)
o Planning Remove all hardwired drivers from kernel (Alan
Cox, etc.)
o Planning Generic parameter/command line interface
(Keith Owens)
o Planning New mount API (Al
o Planning Implement new device naming convention
(Device naming team)


o in 2.5.3 Break into multiple files
(Linus Torvalds)
o in 2.5.3 Untangle include file dependancies (Dave
Jones, Roman Zippel)
o in 2.5.4 Per network protocol slabcache & sock.h
(Arnaldo Carvalho de Melo)
o in 2.5.4 Per filesystem slabcache & fs.h
(Daniel Phillips, Jeff Garzik, Al Viro)
o in 2.5.6 Killing kdev_t for block devices (Al

o Ready Switch to ->get_super() for file_system_type (Al
o Ready ->getattr() ->setattr() ->permission() changes (Al
o Ready Remove dcache_lock
(Maneesh Soni, IBM team)

o Beta file.h and INIT_TASK
(Benjamin LaHaise)
o Beta Proper UFS fixes, ext2 and locking cleanups (Al
o Beta Lifting limitations on mount(2) (Al

o Alpha Split up x86 setup.c into managable pieces
(Patrick Mochel)

o Started Reorder x86 initialization (Dave
Jones, Randy Dunlap)

Have some free time and want to help? Check out the Kernel Janitor
TO DO list for a list of source code cleanups you can work on.
A great place to start learning more about kernel internals!

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