Keep it simple

[ikiwiki.git] / diary.mdwn

## Fri 03 August 2007

* **NATA is now the default ata driver.**
* **Major changes made to the disk abstraction layer.**
* **Significant changes made to disk device minor numbers in /dev.**
* **GPT and 64 bit disklabel support added (non booting).**
* **The LWP (Userland threading work) is now essentially done.**
* **Major work on vinum to remove its roll-your-own disklabel layer and to remove its assumptions about the device layer's DMA capabilities.**
* **Introduce libpthread as a softlink allowing libthread_xu or libc_r to be selected.  All multithreaded programs are now linked against libpthread.   libc_r is the default as there are still a few issues that need to be worked out with libthread_xu.**
* **Major improvements to wireless networking drivers.**
* **Many new USB and PCI devices added.**
* **Numerous new PCI drivers added, particularly w/ networking.**
* Userland syslink API is now finished.
* Link state changes are now reported through the routing socket.
* Signal and proper stop/continue support added to LWPs
* Entire kernel is now LWP and thread centric instead of process
        and thread centric.
* Bind 9.3.4 integrated
* GCC 4.1.2 integrated, selectable with CCVER.  GCC-3 is still
        the default.
* Add an abstraction layer to vn_strategy() to hide DMA limitations
        of underlying devices.
* Fix symbol resolution issues with loaded modules.
* Both GCC-3 and GCC-4 are now built by default.
* Improve virtual kernel disk and networking support.  Multiple
        disks and network interfaces are now supported.
* Implement SMP support for virtual kernels (mainly as a testbed).
* Many documentation updates.
* Enhance kinfo_proc to return LWP info.
* Enhance the virtual kernel's console.
* Replace gnu tar with BSD tar.
* Fix a single stepping bug that could lead to a panic.
* Allow multiple kernels to be supplied on the release ISO and
        supply a VKERNEL kernel in addition to the normal kernel.
* Get rid of the UAREA for good.
* Synchronize zoneinfo changes with recent standards changes.
* Fix a mbuf leak in sbappendcontrol().
* Fix an exec*() syscall memory leak that can lock a machine up
        when the exec temporary argument space becomes exhausted.
* Bring in the latest libarchive, bsdtar, sendmail, awk,
        ping, file, less, and openssh.
* Bring in binutils 2.17.
* Support MBs that do not have keyboard controllers by placing
        an upper limit on the keyboard controller probe timeout.
* Remove IPV6 type 0 router header support entirely.
* Implement SYSREF for the kernel - this structure and API
        implements MP-safe reference counting and also associates a
        unique 64 bit id with the structure allowing the structure to
        be referenced off-machine.  SYSREF is part of the clustering work.
* Use SYSREF for struct vmspace and struct vnode, including doing
        a major revamping of the vnode reference handling code.
* Do a major reordering of many SYSINITs and a major reordering
        of where device configuration occurs in the boot sequence.
        Device configuration now occurs far later in the boot sequence
        and has access to most major subsystems including threading
        and major memory subsystems.  Interrupts are now enabled during
        device configuration.  This is somewhat experimental but works
        great in allowing us to locate ordering issues in various device
        init functions related to their interrupts.
* Implement asynchronous device attachment but default to
        disabled for 1.10.
* Reformulate disk management layer ioctls and remove data
        pollution.  Do not store filesystem-specific data such as
        the fragment size in the disklabel any more.
* Expand the SCSI subsystem to handle 16-byte commands,
        allowing > 32 bit block addressing for devices that support
        it.
* Change the 'make upgrade' target to attempt to rebuild the
        devices found in /dev instead of just rebuilding base devices.
* Distributions now include a Makefile in /usr with easy-to-use
        targets for creating and synchronizing /usr/src and /usr/pkgsrc.
* Greatly simplify LWKT messaging within the kernel.
* Add virtual CDROM support to the virtual kernel.
* Add halt and reboot support to the virtual kernel.
* Fix a bug in bus_dmamap_load() that was not properly following
        boundary and maximum segment size limits.
* Save and restore a USB keyboard's translation mode, allowing
        the keyboard to be un-plugged and re-plugged.
* Remove the last source of major SMP TLB invalidations in the
        fork/exec/exit/wait critical paths, significantly reducing IPI
        traffic and improving fork/exec performance.
* ktrdump now has an option to loop waiting for new input.
* Fix mouse jumpiness when emergency interrupts are enabled by
        not polling PS/2 mouse interrupts.
* Fix numerous CAM/USB issues so we do not panic or crash if
        a USB mass storage device is pulled while still mounted.  Make
        sure umount -f works on pulled devices.
* Synchronize the sound subsystem with FreeBSD.
* Timeout positive hits in the namecache as well as negative hits
        for NFS mounts.  Otherwise rename-over's can result in a stale
        namecache that doesn't auto recover.
* Add MPLS support to traceroute and add a protocol entry in
        /etc/protocols for MPLS-in-ip.
* Bring in a number of math library fixes from FreeBSD.
* **dntpd now properly handles DNS failures, supports DNS pools,
        and does a quorum consistency check when told to use more then
        one source.**

* Fix a bug in the checkpointing code that was preventing a
        program from being re-checkpointed properly.
* Major USB code cleanup.
* Adjust dynamic objcache sizing to handle certain degenerate
        conditions.
* Synchronize with the Adaptec SCSI code from FreeBSD.
* Retire the original ports packaging tools.


## Tue 30 January 2007

* **Implement Virtual Kernel support and add a VKERNEL target.**
        Virtual kernels are run as userland processes and provide a 
        complete (minus hardware drivers) working kernel environment.
        A simulated disk driver is included and a simulated network
        driver using the TAP interface is included, allowing network
        access.  See the vkernel(7) manual page for more information.
* Introduce getcontext(3), setcontext(3), and friends
* **Release 1.8.0!**


## Mon 1 January 2007

* Jails are now IPv6 aware and support multiple IP addresses.
* Bridging support has been greatly improved.
* Many, Many new network drivers and chipsets have been added.
* Major infrastructure for 802.x wireless support added (WPA,
        TX rate control, major API layer for all wireless network
        devices, better ifconfig integration, and more).
* The cpdup program has been greatly enhanced and now supports
        remote copies via ssh..
* Improved support for old-style disklabels.
* Kernel sources are now included on release CDs.
* Major rewrite of the vnode operations infrastructure, greatly
        simplifying the layer.
* Fix a bug related to POSIX locking.
* Tons of documentation updates and code readability cleanups.
* Restructure the kernel build to accomodate multiple architectures.
        Start separting platform components from cpu components.
* Synchronize a bunch of AMD64 related items (but we don't support
        64 bit mode yet).
* Major rewrite of the mount glue infrastructure and NULLFS which
        allows the namecache topology to be shared for multiple NULLFS
        mounts and also allows arbitrary stacking of read-only and
        read-write NULLFS mounts with basically zero kernel overhead.
* Unconditionally associate a namecache reference with all 
        file descriptors, allowing us to share vnodes across different
        mounts (NULLFS).
* NULLFS mounts may now be arbitrarily stacked and distinct paths
        are no longer required.
* Properly dereference mount point roots when unmounting.  Raise
        hell if unmounting a filesystem which still has references.
* Do a massive reorganization of the device operations vector and
        remove many instances where devops functions were dependant on
        the calling process or thread to obtain cred information.
* Do a run through of all system header files to make sure they
        include any dependancies themselves, instead of requiring the
        originating source file to include the dependancies first.
        This greatly reduces the effort required to use kernel header
        files in new sources.
* Synchronize MII support with NetBSD and OpenBSD, including adding
        standard conforming GMII support.  Er. In otherwords, improve
        driver support for physical network interfaces (phys's).
* Remove VOP locking vectors.  Make VOP locking functions direct
        calls (and thus mandatory).
* Control access to vnode ref count fields with a spinlock
* Fix a dubious construct in usr.bin/tail (no, really! That's
        what the commit message said!).
* Add support for %j to the kernel printf.
* Major symbol separation for most kernel functions which 
        inexactly mimic libc functions. e.g. printf -> kprintf,
        in order to allow user-mode kernels to be linked against libc.
* Update to sendmail to 8.13.8.
* Update to OpenSSL to 0.9.8d
* Update to OpenSSH 4.5p1
* Update to Bind 9.3.2-P1
* Update to less 3.9.4
* Update to awk 20050424
* Update to file 4.19
* Update to tcpdump 3.9.5
* Update to libpcap 0.9.5
* Synchronize m4 with FreeBSD
* Import libarchive
* Import bsdtar 1.3.1 and make bsdtar our default tar.  GNU tar
        is still installed as gtar.
* Import NetBSD's ftp client under its new name (tnftp).
* Bring in GCC-4.1 (setenv CCVER GCC41 to use).
* Significant code cleanups to make the world and kernel compile
        under GCC-4.1.  Note that the default compiler is still GCC 3.4
        (GCC-4.x will probably become the default sometime in 2007).
* More work on LWP/THREAD/PROC separation for 1:1 threading support.
* Fix a major bug in /bin/make that can cause make (or some child
        make in a large build) to ignore ^C.  make temporarily installs
        SIG_IGN when polling whether a signal is being ignored or not.
        Fix the code to not do this.
* Fix a long standing signal/fork race that could cause a process
        group signal to not make it to a newly fork child if it occurs
        while the fork is in progress.
* Synchronize the zoneinfo database with tzdata2006p.
* Add an ECC detection device, currently supporting AMD64's memory
        controller.
* Greatly reduce the memory allocated by fsck when fscking 
        filesytems with a huge number of directories (primarily mirors
        with lots of hardlinked files).  Otherwise fsck can run out
        of memory on such filesystems.
* Adjust RCNG to support 'blah=YES/NO' as well as
        'blah_enable=YES/NO', giving us better compatibility with
        PkgSrc based RC scripts.
* Fix a bug related to ALTQ when setting the algorithm for a queue
        on which packets are already present.
* Do a major clean up of the BUSDMA header file architecture.
* We have a new web site layout!
* Use spinlocks in the objcache instead of tokens (the critical
        path is still lockless).
* Replace the global VM page hash table with a per-VM-object
        Red-Black tree.
* A considerable amount of work on IPSEC support has been done.
* NATA has been ported from FreeBSD and is currently being tested.
* Sync USB support with FreeBSD6 - use task queues to handle
        operations that cannot be handled from an interrupt thread.
* Explore low-speed USB busses during cold boot so the USB keyboard
        starts working earlier in the boot sequence.
     


* Start introducing glue for the SYSLINK and CCMS infrastructures.
        (system link protocol and cache coherency management subsystems).
* Introduce a system call skeleton and test code for SYSLINK.
* Introduce the algorithm and structural topology that will be
        used for cache coherency into the VFS path.
* Introduce a user-managed virtuallized page table infrastructure
        which can be accessed via mmap(), as part of the infrastructure
        to support virtual kernels running in userland (MAP_VPAGETABLE).
* Introduce vmspace_*() system calls which allows a user process
        to manage and control multiple VM spaces, as part of the
        virtualization support effort.




## Wed 12 July 2006

* Continued work on LWP/PROC separation.
* Continued pkgsrc integration.
* Fix refcount bugs in the kernel module loader and unloader.
* Lots of netif and serializer cleanups and fixes.
* Lots of softupdates, filesystem, and buffer cache related fixes.
* Remove more of the old ports-related infrastructure.
* Major documentation cleanups.
* Major code cleanups, ansification.
* Change the system #include topology so that each include file
        is responsible for #include'ing any dependant include files.
* Fix a bug in the PF fragment cache.
* Random number generator: Instead of generating entropy from
        selected interrupts (and none by default), we now generate
        entropy from all interrupts by default and rate limit it to
        not interfere with high performance interrupts.  Completely
* Random number generator: Completely replace the algorithms,
        remove limitations on returned bytes from /dev/random (which
        only served to cause programs to not use /dev/random due to its
        lack of dependability).  Add the ability to seed the RNG.
        Do some automatic initial seeding at boot.
* Adjust ssh to find the pkgsrc X11BASE instead of the old ports
        X11BASE.
* Fix some compatibility issues in /bin/sh.
* Fix a small number of critical section enter/exit mismatches.
* Bring in a bunch of new malloc() features from OpenBSD
        (guard pages, free page protection, pointer guard, etc).
* Clean up the DragonFly build system's automatic .patch handling.
* Bring in openssh 4.3p2.
* Retire libmsun.  It was replaced by NetBSD's libm.
* Fix a bug in the NFS timer/retry code.
* Fix issues related to wide-char support.
* <B>Fix a number of private TSS bugs related to threaded programs.</B>

* <B>Completely rewrite the user process scheduler and usched APIs.</B>
* <B>Add system calls that allow a blocking/non-blocking flag to be
        passed independant of the O_NONBLOCK state of the descriptor.</B>
* <B>Remove all fcntl(... O_NONBLOCK) calls from libc_r, use the
        new system calls instead.  This solves numerous problems with
        file descriptors shared between threaded and non-threaded
        programs getting their non-blocking flag set, and then blowing
        up the non-threaded program.</B>
* Add additional red-black (RB) tree function support for ranged
        searches.
* Get rid of gdb -k, replace with a separately built kgdb, and
        build a separate libgdb as well.
* Implement a VM load heuristic.  Remove the full-process SWAP
        code which never worked well and replace with page-fault
        rate-limiting code based on the VM load.
* Fix a serious bug in adjtime()'s microseconds calculation.
* Fix a serious bug in libc's strnstr() function.  The function
        was testing one byte beyond the specified length limit.  This
        can cause a seg-fault when, e.g. using strnstr() on a memory
        mapped file whos last byte abuts the end of the VM page.
* Bring in sendmail 8.13.7.
* Bring in SHA256 support from FreeBSD.
* Implement a hardlink-mirroring option (-H) in cpdup.
* Add missing code needed to detect IPSEC packet replays.
* Enable TCP wrappers in sshd.
* Restrict recursive DNS queries to localhost by default.
* <B>Massive reorganization and rewrite of the 802_11 subsystem,
        with many pieces taken from FreeBSD.</B>

* Fix a number of issues with user-supplied directory offsets
        blowing up readdir/getdirentries for NFS and UFS.
* Normalize internal kernel I/O byte lengths to 'int' and remove
        a ton of crazy casts to and from unsigned int or size_t.
* Remove NQNFS support.  The mechanisms are too crude to co-exist
        with upcoming cache coherency management work and the original
        implementation hacked up the NFS code pretty severely.
* Remove VOP_GETVOBJECT, VOP_DESTROYVOBJECT, and VOP_CREATEVOBJECT.
        They never lived up to their billing and DragonFly doesn't
        need them since DragonFly is capable of aliasing vnodes via
        the namecache.  Rearrange the VFS code such that VOP_OPEN is
        now responsible for assocating a VM object with a vnode.
* Formalize open/close counting for the vnode and assert that
        they are correct.
* Remove the thread_t argument from most VOP and VFS calls.
        Remove the thread_t argument from many other kernel procedures.
* Integrate FreeBSD's new ifconfig(8) utility.
* Fix a race condition in the floating point fault code that
        could sometimes result in a kernel assertion.
* Fix a crash in the TCP code when the MTU is too small to
        support required TCP/IP/IPSEC options and headers.
* Separate EXT2 conditionals from the UFS code, copying the files
        in question to the EXT2 directory instead of trying to 
        conditionalize them.  Also remove function hooks and other code
        mess that had been implemented to allow the UFS code to be
        used by EXT2.
* Greatly simplify the lockmgr() API.  Remove LK_DRAIN, 
        LK_INTERLOCK, and many other flags.  Remove the interlock 
        argument.
* Fix a bug in the POSIX locking code (lockf).  Actually, completely
        rewrite the POSIX locking code.  The previous code was too
        complex and mostly unreadable.
* Do a major clean up of all *read*() and *write*() system calls,
        and iovec handling.
* Replace many instances where LWKT tokens are used with spinlocks.
* Make spinlocks panic-friendly.  Properly handle the detection
        of indefinite waits and other deadlock issues.
* Improve network performance by embedding the netmsg directly in
        the mbuf instead of allocating a separate netmsg structure for
        each packet.
* <B>Implement both shared and exclusive spinlocks.
        Implement a much faster shared spinlock.  Cache the shared
        state such that no locked bus cycle operation is required in
        the common case.</B>

* Implement msleep().  Use a novel approach to handling the
        interlock that greatly improves performance over other 
        implementations.
* Add cpu-binding support to the scheduler and add a system call
        to access it.  A user process can be bound to a subset of cpus.
* <B>Prefix all syscall functions in the kernel with 'sys_'
        to reduce function prototype pollution and incompatibilities,
        and to eventually support virtualized kernels running in
        userland.</B>
* Port the enhanced SpeedStep driver (EST) for cpu frequency control.
* Remove the asynchronous syscall interface.  It was an idea before
        its time.  However, keep the formalization of the syscall
        arguments structures.
* Add a facility which statistically records and dumps program
        counter tracking data for the kernel.
* Improve kernel SSE2-based bcopies by calling fnclex instead of
        fninit.
* Major BUF/BIO work - <B>make the entire BUF/BIO subsystem BIO
        centric.</B>
* Major BUF/BIO work - <B>get rid of block numbers, use 64 bit 
        byte offsets only.</B>

* Major BUF/BIO work - Clean up structures and compartmentalize
        driver-specific private fields.  Rewrite and simplify device
        and vnode strategy APIs.
* Major BUF/BIO work - Remove B_PHYS.  There is no longer any
        differentiation between physical and non-physical I/O at
        the strategy layer.
* Major BUF/BIO work - Replace the global buffer cache hash table
        with a per-vnode RB tree.  Add sanity checks.  Require that all
        vnode-based buffers be VMIO backed.
* MPSAFE work - <B>Implement the parallel route table algorith.</B>
* MPSAFE work - <B>Make the user process scheduler MPSAFE.</B>
* MPSAFE work - <B>File descriptor access is now MPSAFE.  Many
        fd related functions, like dup(), close(), etc, are either MPSAFE
        or mostly MPSAFE.</B>
* MPSAFE work - <B>Push the BGL deeper into the kernel call stack
        for many system calls.</B>

* MPSAFE work - <B>Make the process list MPSAFE.</B>
* MPSAFE work - <B>Make all cred functions MPSAFE.</B>
* NRELEASE - compilable kernel sources are now included on the ISO.


## Sat 7 January 2006

* Add the closefrom() system call.
* GCC 3.4 is now the default compiler.  2.95.x is no longer 
        supported (it can't handle the new threading storage classes
        properly).
* Import Citrus from NetBSD.
* Implement direct TLS support for programs, whether threaded or not.
* Major library and user-visible system structure changes
        (dirent, stat, errno, etc), and other work requires a major
        library bump for libc and other libraries.  libc is now
        libc.so.6.
* stat: inode size now 64 bits, nlink now 32 bits.  new fields, 
        added pad.
* dirent: inode size now 64 bits, various fields disentangled from
        the UFS dirent.
* statfs: new fields, added pad.
* Clean up RC scripts that are not used by DragonFly.
* Remove the OS keyword requirement for RC scripts.
* Add support for unsigned quads to sysctl.
* Implement DNTPD, DragonFly's own NTP client time synchronization
        demon.
* Correct a large number of bugs in the third party ntpd code, but
        for client-side operations we now recommend you use dntpd.
* Add a framework for aggregating per-cpu structures for user 
        reporting.
* Userland TLS (data spaces for threads) support added.
* Create a binary library compatibility infrastructure that
        allows us to install and/or upgrade older revs of shared
        libraries on newer machines to maintain compatibility with
        older programs.
* Fix issues related to the expansion of symbolic links by the
        bourne shell.
* Many, many mdoc cleanups and fixes.
* Update cvs, openssl, ssh, sendmail, groff, 
        and other numerous contributed applications.
* Bring in a brand new PAM infrastructure.
* Introduce pkgsrc support.
* Get rid of libmsun.
* Implement backwards scanning and partial-transaction handling
        features in jscan.

* FreeBSD-SA-05:06.iir - major disk access vulnerability for IIR
* FreeBSD-SA-05:04.ifconf - memory disclosure vulnerability
* FreeBSD-SA-05:08.kmem - memory disclosure vulnerability
* FreeBSD-SA-05:16.zlib - possible buffer overflow in zlib
* FreeBSD-SA-05:18.zlib - possible buffer overflow in zlib
* FreeBSD-SA-05:15.tcp - fix TCP RESET window check 
        (DOS attack vulnerability)
* ? - a bzip2 vulnerability

* Fix a bug in the TCP NewReno algorithm which could result in
        a large amount of data being unnecessarily retransmitted.
* Fix numerous TCP buffering issues.
* Implement TCP Appropriate Byte Counting
* Bring in ALTQ and reorganize the IF queueing code to remove
        per-driver dependencies on ALTQ.
* Strip away numerous TCP hidden indirections that make code hard
        to read and understand.
* Introduce BPF_MTAP which includes an address family parameter.
* Reimplement network polling with a systimer, allowing the
        frequency to be adjusted on the fly.
* Remove the really bad hack that was calling the network polling
        code from the trap code.
* Completely rewrite network polling support.
* Make the network IF serializer mandatory for all network device
        driver interrupts, ioctl's, and if_ callbacks.
* Implement a very fast memory object caching infrastructure.  This
        will eventually replace zalloc() (but not yet).
* Rewrite the mbuf allocator using the new memory object caching
        infrastructure.  Remove many crazily-large mbuf macros in favor
        of the new infrastructure.
* Convert all remaining uses of the old mbuf m_ext API to the new
        API.  Remove support for the old API.
* Reorder the detach sequence in all network drivers.  Unhook the
        interrupt first rather then last.
* Fix all instances where an mbuf packet header and mbuf data 
        buffer were being referenced by the wrong name and all instances
        where the packet header flag was being improperly set or cleared.
* Fix a number of mbuf statistics counting bugs.
* Fix numerous bugs in ipfw/ipfw2 where m_tag data was not being
        stored in the right place, resulting in a panic.
* Add support for the experimental SCTP protocol.
* Fix an issue with cloned interfaces being added twice.

* Add a passive IPIQ call for non-time-critical events such as
        memory free() calls.
* Add TLS support for threads using the GDT instead of the LDT.
* Greatly simplify and demystify the NTP kernel interface.  Convert
        most aspects of the interface over to sysctls.
* Implement ranged fsync's in-kernel.  This capability will 
        eventually replace the write-behind heuristic.

* Introduce MP-safe mountlist scanning code.
* Introduce rip-out-safe red-black tree scanning code.
* Use the new RB scanning code to get rid of VPLACEMARKER and
        generally use the new RB scanning code to handle all RB tree
        scanning in a safe way (allowing the scan code callback to block).
* Zoneinfo upgrades
* Rename cpu_mb*() functions to cpu_mfence(), cpu_lfence(), and
        cpu_sfence() to make their function more apparent.
* Fix bugs in the LWKT token code related to token references
        being lost due to a preemption or blocking condition.
* Fix bugs in the LWKT rwlock code relating to preemption occuring
        during token acquisition.
* Fix a bug in the LWKT thread queueing and dequeueing code 
        related to a preemption.
* Increase the size of the physmap[] array to accomodate newer
        PCs which have a larger number of memory segments and fix
        an overflow bug.
* Use the ACPI timer if present instead of one of the other 8254
        timers (which are not dependable because BIOS calls might 
        manipulate them).
* Change cpu statistics to be accounted for on a per-cpu basis.
* Make network routing statistics per-cpu.
* Extend the interrupt vector code to pass a frame as a pointer.
* Remove the last vestiges of the old mbuf tagging code.
* Add a serializer API and code (basically blockable mutexes).
* Add interrupt enablement and disablement features to the new
        serializer module to deal with races against blocked serializer
        locks when e.g. removing a driver.
* Remove bus_{disable,enable}_intr(), it was not generic enough
        for our needs.
* Remove all spl*() procedures and convert all uses to critical
        sections.
* Do not try to completely halt all cpus when panic()ing as this
        will likely leave the machine in a state that prevents it from
        being able to do a dump.
* Try to unwind certain conditions when panic()ing from a trap
        in order to give the machine a better chance to dump its core.
* A number of malloc()'s using M_NOWAIT really needed to be
        using M_WAITOK.
* Attempt to avoid a livelocked USB interrupt during boot by 
        delaying the enablement of the EHCI interrupt until after all
        companion controllers have been attached.
* Reimplement the kernel tracepoint facility (KTR) to greatly
        reduce the complexity of the API as well as remove all hardwired
        flags and values.  In addition, record two levels of call
        backtrace for each entry, if enabled.
* Beef up ktrdump to display symbolic results when possible.
* Beef up the slab allocator build with INVARINTS by adding a
        bitmap to detect duplicate frees and such.
* Remove the 16 bit count limit for file descriptors.
* Replace the file descriptor allocator with an O(log N) 
        full-on in-place binary search tree.
* Allow the initial stack pointer for a use process to be
        randomized.
* Fix numerous scheduling issues that could cause the scheduler
        to lose track of a reschedule request, resulting in poor 
        interactive performance.  Rewrite the interactive/batch
        heuristic.
* Begin to implement a management system to allow multiple 
        userland schedulers to be configured in a system.
* Add rm -I and add an alias for interactive shells to use it
        by default.  -I is a less invasive -i.
* Fix a bug in the pipe code that was not handling kernel-space
        writes correctly.  Such writes can occur whenever the kernel
        writes KVM-referenced data to a descriptor, such as that
        journaling code might do.
* Fix many issues with the high level filesystem journaling code.
        High level journal records are now considered fairly solid.
* Implement the transactional features of the high level journaling
        subsystem by allowing a journaling record to be written prior to
        the VFS operation being executed, then aborted if the VFS operation
        fails.
* Implement UNDO records for most journaling transaction types.
* Implement the journaling code's full-duplex ack protocol feature
        which allows journals to be broken and restarted without losing
        data.
* Implement a stat-visible FSMID (filesystem modification id).  This
        identifier changes whenever any modifying operation on the file
        or directory occurs, and for directories this identifier also
        changes if anything in the sub-tree under the directory is
        modified (recursively).  The FSMID is synthesized for filesystems
        which do not implement it directly in order to guarantee its 
        usefulness for at least a subset of operations.
* Implement pesistent storage of the FSMID for UFS.
* Implement shutdown() support for pipes.
* Implement a low level spinlock facility.  Basically the 
        implementation gives us an MP-safe critical section type of
        vehicle.  However, being a spinlock the facility may only be
        used for very short sections of code.
* Fix a bug with USB<->CAM communication for USB mass storage
        devices.
* Fix numerous bugs in USB, primarily EHCI.
* Fix multiple panics when a fatal trap occurs from an IPI or
        FAST interrupt.  Interlock panics on multiple cpus so only the
        first is recognized as the 'real' panic.
* Add a large number of assertions to the scheduler and interrupt
        subsystems.
* Fix a critical IPI messaging bug (SMP only).
* Do not compile the kernel with the stack protector.  The stack
        protector generates weird incorrect or unexpected code in some
        cases which interfere with the C<->assembly interactions in the
        kernel build
* Various bug fixes to softupdates. 
* Fix a bitmap scanning bug in UFS which could sometimes result
        in a sanity check panic, but no data corruption.
* Fix a deadlock in UFS's ffs_balloc() related to an incorrect
        buffer locking order.
* Continued work on the buffer cache.
* Separate out APIC and ICU interrupt management.
* Rewrite the interrupt setup code.
* Major rewriting of the VFS directory scanning code.  Add a new
        function vop_write_dirent() to create the dirent for return to
        userland.  The new API is mandatory and filesystem code (not
        even UFS) may not make assumptions about the size of the
        userland-returned dirent.
* Major cleanup of the device identification method.
* Lots of driver updates.
* ANSIfy a great deal more of the codebase.
* Remove the now obsolete smp_rendezvous() mechanism.
* Compile up both the TFTP and the NFS PXE bootp code rather
        then the (previous) make.conf option to select one or the other.
* Convert the lockmgr interlock from a token to a spinlock, also
        incidently fixing an issue where non-blocking locks would
        still potentially issue a thread switch.
* Fix bugs in the interrupt livelock code.
* Rewrite the code handling stopped user processes.
* Rewrite tsleep()/wakeup() to be per-cpu and MPSAFE.  Reorganize
        the process states (p_stat), removing a number of states but
        resynthesizing them in eproc for 'ps'.
* Integrate the new if_bridge code from Open/Net/FreeBSD.
* Add an emergency interrupt polling feature that can be used
        to get an otherwise non-working system working.



## Thu 7 April 2005

* Fix numerous issues in the new namecache code.  The new code is
        now considered to be solid (Matt).
* Fix numerous issues in the NFS code related to cache timeouts
        not working properly, truncate operations not working properly
        in certain circumstances, and TCP disconnections due to 
        races in accessing the streamed data.  NFS was also not properly
        setting TCP_NODELAY which resulted in poor performance over
        TCP connections (Matt).
* Split out kernel information access abstraction into libkcore
        and libkinfo (joerg).
* Optimize the interrupt processing code a bit (Matt).
* Significant progress in the journaling layer has been made,
        but it isn't ready for production use yet.  The journaling
        layer is now capable of encoding a forward journaling stream
        (the undo data is not yet being encoded).  Still TODO:  undo
        data, two-way transaction acknowledgement protocol, and
        emergency swap backing to allow system operation to proceed
        in the event of a long-term journaling stream stall. (Matt)
* Fix numerous issues related to SMP-distributed wildcard 
        listen sockets for TCP. (Jeff, Matt)
* Major cleanup of the route table code in preparation for
        SMP replication work (Jeff)
* ALTQ Integration (Joerg)
* Fix MTU discovery which appears to have been broken
        forever (Jeff).
* Miscellanious driver updates. (Various)
* Miscellanious ACPI updates.
* Fix a security issue with sendfile() (Various)
* Lots of work on the make program (Max)
* Add TLS support calls to the kernel to create segments suitable
        for loading into %gs. (Matt, David Xu)
* Add TLS support to the dynamic linker (David Xu, Joerg)
* Add kernel support for mmap-based userland mutexes
* Continuing work on a new threading library (David Xu)
* Add jail support for varsyms (Joerg)
* Incorporate the Minix MINED editor into the /bin build for use
        as an emergency editor while in single-user.
* Fix an issue with PCMCIA card removal.
* Replace the VM map lookup data structures with a red-black tree.
* Fix a potentially serious issue with inodes being reused before
        their associated vnodes have been entirely recycled.  This also
        prevents unnecessary stalls on recycle flushing against new
        file creation that would otherwise have to block waiting for
        the inode it chose to finish cycling.
* Fix some minor issues with /dev/tty operations.
* Fix an issue with the vnode recycler.  Certain types of file
        extractions could cause it to stop oprating due to not being
        able to clean out the namecache topology.  This most often
        occured when extracting archives with a large number of 
        hard links.
* Fix two issues that caused the system's time of day tracking to
        either stop operating or operate incorrectly.
* Enhance the checkpointing code to save and restore the 
        signal mask.
* Major work on the XIO and MSFBUF infrastructures as we begin to
        use them in the kernel more. (Hiten, Matt)
* Implement CLOCK_MONOTONIC for the clock_*() system calls.
* Fix a bug in the TCP limited transmit code.
* Fix a crash that sometimes occurs when using the firewire
        console.
    



## Mon 20 December 2004

* The old timeout() API has been completely ripped out and replaced
        with the newer callout_*() API.
* USB support has been synchronized with FreeBSD and NetBSD
* USB keyboard detachment and reattachment while X is active no
        longer messes up the translation mode.
* Fix a keyboard lockup issue (the new callout code was not being
        properly called in an ATKBD hack to deal with lost interrupts).
* **TCP SACK support is now considered production stable (Jeff).**
* A TCP connection closing bug has been fixed, related to changes
        we've made to the TCPS state values.
* **Expand TCP's header prediction case to handle common 
        window updates (Jeff), greatly improving cpu efficiency.**
* **Implement tail-append to sockbufs for the TCP stack, greatly
        improving cpu efficiencies when dealing with large TCP buffers.**

* Lots of miscellanious network layer cleanups (Joerg).
* Fix an IPv6 pcb replication issue that was creating problems
        with e.g. Apache-2.0.
* kernel event logging ported from FreeBSD (eirikn).
* DCONS (console over firewire) support added (simokawa/from FreeBSD)
* Additional GigE drivers added.
* Major VFS messaging and interfacing progress.  The old namei()
        and lookup() API has been completely removed.  All high level
        layers now use the new API and run through a compatibility layer
        to talk to VFSs which still for the most part implement the old
        VOP calls.  Use locked namespaces to protect RENAME, REMOVE,
        MKDIR, and other calls rather then depending on locked vnodes
        for those protections.
* More VFS work.  Keep track of the current directory with a
        namecache pointer rather then a vnode pointer.
* More VFS work.  Rewrite the vnode interlock code during 
        deactivation and disposal.  Begin consolidating v_lock.
* Adjust the boot code to operate more deterministically by always
        using EDD (linear block number) mode first, only falling back
        to CHS if EDD fails.  Before it would try to use CHS for
        cylinders < 1024, resulting in non-deterministic operation on
        modern machines.
* Separate out loader configuration files for BOOTP vs non-BOOTP
        boots.
* IPSEC code moved to netproto/ipsec, update, and cleanups
        (Pawel Biernacki).
* Minor fixes to PPP.
* Performance cleanup of if_em.  Fix alignment requirements to
        reduce instances where bounce buffers are allocated (from FreeBSD). 
* Kernels built with debug info are now installed with debug info,
        greatly improving normal enduser's ability to provide useable
        bug reports.  The backup copy of the kernel is stripped when
        the copy is made.
* **A number of bug fixes to the VM system seem to have fixed the few
        remaining long-term panics in DragonFly.  In particular, a very
        serious bug in contigmalloc() inherited from FreeBSD-4.x has been
        fixed  We now consider DragonFly as stable as FreeBSD-4.x.**

* Many minor driver bug fixes here and there, including one to the
        serial driver which was responsible for machine lockups in
        certain cases.
* **Major expansion of the checkpoint code API.  You can now
        re-checkpoint programs that have been checkpoint-restored.  
        The system call for checkpointing and checkpoint restore
        functions is now official.  Certain VM area issues have been
        fixed.  And it is now possible (and easy!) to write 
        checkpoint-aware programs.**
* Abstract kernel structure access via libkinfo (joerg).
* Fix a number of timer issues related to the 8254, sleep/wakeup,
        and recovery from clock jumps due to high latencies.
* Do better ESTALE checking for NFS clients to reduce instances
        where ESTALE makes it all the way back to the application layer.
* Improved polling support for UHCI USB (drhodus).
* Fix /boot/loader's handling of extended DOS partitions.  There was
        an off-by-one issue that prevented the boot loader from passing
        the proper slice number to the kernel in certain cases (walt).
* Integration of PF as third firewall (joerg, corecode, Devon O'Dell,
        from FreeBSD/OpenBSD)


## Sat 18 September 2004

* DragonFly has adopted the 3-clause BSD license as its official
        license.
* NFS - increase the size of the nfsheur hash table as per a
        Freenix track paper.  nfsheur is used for sequential I/O
        heuristic in NFS.  The increase greatly improves clustering
        under parallel NFS loads.
* More VFS work: make vnode locks mandatory, get rid of nolock
        kludges in NFS, procfs, nullfs, and many other filesystems. 
        Remove the vnode_if.m dynamic dispatch algorithms and replace 
        with a fixed structure (in preparation for upcoming VFS work).
        Rewrite the VOP table parsing code.  Redo vnode/inode hash table
        interactions to close race conditions (Matt).  
* Reorganize the boot code to consolidate all fixed ORG directives
        and other dependancies into a single header file, allowing us
        to re position the boot code and eventually (not yet) move it
        out of low BIOS memory.  Change the way the BTX code clears BSS

        to make it more deterministic and more gcc3 compatible.
* A major cleanup of ipfilter has been done (Hiten).
* Fix a very old but serious bug in the VM system that could result
        in corrupt user memory when MADV_FREE is used (from Alan Cox).
* Rewrite most of the MBUF allocator and support code.  Get rid
        of mb_map and back the mbuf allocator with malloc.  Get rid of
        the old-style m_ext support and replace with new style m_ext
        support (which is somewhat different then FreeBSD's new code).
        Cleanup sendfile() to use the new m_ext callback scheme.
* Lots minor/major bug fixes, cleanups, new driver support, etc.
* More GCC3 work.  The system mostly compiles and runs GCC3 builds
        but the boot/loader code still has some issues (Various people).
* Work on the userland schedule.  Introduce an 'interactivity'
        measure in an attempt to do a better job assigning time slices.
        Fix some scheduler interaction bugs which were sometimes resulting
        in processes being given a full 1/10 second time slice when they
        shouldn't be.
* A major import of the FreeBSD-5 802_11 infrastructure has been
        accomplished (Joerg).
* NDis has been ported from FreeBSD, giving DragonFly access to
        many more 802.11 devices via windoz device drivers (Matt).
* Add thermal control circuit support (Asmodai).
* Generally add throttling support to the system.
* **Add TCP SACK support (Jeffrey Hsu).  This is still considered
        experimental.**

* Make the syncache per-cpu and dispatch syncache timer events 
        via LWKT messages directly to the appropriate protocol thread
        (Jeffrey Hsu).  This removes all race conditions from the syncache
        code and makes it 95% MP safe.
* **Greatly reduce the number of ACKs generated on a TCP connection
        going full-out over a GigE (or other fast) interface by delaying
        the sending of the ACK until all protocol stack packets have been
        processed.  Since GiGE interfaces tend to aggregate 8-12(+) 
        received packets per interrupt, this can cut the ACK rate by 75%
        (one ack per 8-12 packets instead of one ack per 2 packets), and
        it does it without violating the TCP spec.  The code takes 
        advantage of the protocol thread abstraction used to process
        TCP packets.  (Matt)**
* **Greatly reduce the number of pure window updates that occur over
        a high speed (typ GigE) TCP connection by recognizing that a
        pure window update is not always necessary when userland has
        drained the TCP socket buffer.  (Jeffrey Hsu)**
* Rewrite the callout_*() core infrastructure and rip out the old
        [un]timeout() API (saving ~800K+ of KVM in the process).  The new
        callout infrastructure uses a DragonFly-friendly per-cpu 
        implementation and is able to guarantee that callouts will occur
        on the same cpu they were registered on, a feature that the TCP
        protocol stack threads are going to soon take major advantage of.
* Cleanup the link layer broadcast address, consolidating many 
        separate implementations into one ifnet-based implementation
        (Joerg).
* BUF/BIO progress - start working the XIO vm_page mapping code
        into the system buffer cache (Hiten).  Remove b_caller2 and
        b_driver2 field members from the BUF structure (Hiten) (generally
        we are trying to remove the non-recursive-friendly driver 
        specific fields from struct buf and friends).
* The release went well!  There were a few gotchas, such as trying
        to run dual console output to the serial port causing problems on
        laptops which did not have serial ports.  A bug in the installer
        was serious enough to have to go to an '1.0A' release a day or two
        after the 1.0 release.  But, generally speaking, the release did its
        job!
* More USB fixes.  Clean up some timer races in USB/CAM interactions
        related to pulling out USB mass storage cards.  Fix a serious bug
        that could lead to lost transactions and create confusion between
        the USB code and the device.
* Async syscall work: clean up the sendsys2() syscall API into
        something that's a bit more reasonable (Eirik Nygaard)
* Add a generic framework for IOCTL mapping (Simon).
* Add VESA mode support, giving us access to bitmapped VESA video
        modes (Sascha Wildner).
* Fix USB keyboard support by giving the USB keyboard preference
        even if a normal keyboard is detected earlier in the boot process.
        This is necessary due to hardware/firmware level PS/2 keyboard
        emulation that many USB chipsets and BIOSes offer.
* **Installer Updated: Lots of bug fixes have been made.**

* Stability: Spend two weeks stabilizing recent work in preparation
        for another big push.


## Sun 11 July 2004

* Master ISO for the 1.0-RELEASE is now on the FTP site, we
        release on Monday 12-July-2004.
* **Major revamping of the boot code.  Support dual-console mode
        (video and serial).  Properly detect missing serial ports
        (common for laptops).  Initialize the serial port to 96008N1.**
* Bring ACPICA5 uptodate and integrate it into the build as a
        KLD, just like FreeBSD-5.  Fix additional issues as well.
        Nearly all of this work was done by YONETANI Tomokazu.  Use
        the latest INTEL code (20040527).   This greatly improves
        our laptop support.
* Make the kernel check both CDRom drives for a root filesystem
        when booted with -C, which allows the boot CD to work in either
        drive on systems with two drives.
* **Integrate the DragonFly Installer into the release build.  The
        DragonFly Installer is a from-scratch design by Chris Pressey,
        Devon O'Dell, Eirik Nygaard, Hiten Pandya & GeekGod (aka
        Scott Ullrich).  The design incorporates a worker backend and
        multiply targetable frontends.  Currently the console frontend
        is enabled, but there is also a CGI/WWW frontend which is on the
        CD but still considered highly experimental.**

* Fix a bug in the polling backoff code for the VR device
* Implement interrupt livelock detection.  When an interrupt
        livelock is detected the interrupt thread automatically 
        throttles itself to a (sysctl settable) rate.  When the interrupt
        rate drops to half the throttle limit the throttling is removed.
        This greatly improves debugability, especially on laptops with
        misrouted interrupts.  While it doesn't necessarily fix the 
        broken devices it does tend to allow the system to continue to
        operate with those devices that *do* still work.
* Properly probe for the existance of the serial port in the
        kernel, which allows us to run a getty on ttyd0 by default for
        the release CD.  Prior to this fix attempting to use ttyd0 would
        result in a system deadlock.
* Bring in some pccard driver improvements from FreeBSD, including
        increasing the CIS area buffer from 1K to 4K and properly 
        range-checking the CIS parser (which avoids panics and crashes).
* Update our DragonFly Copyright and update date specifications
        on a number of copyrights.
* Add support for randomized ephermal source ports.
* Do some network driver cleanups.. basically move some common code
        out of the driver and into ether_ifattach() (work by Joerg).
* Try to be more compatible with laptop touchpads whose aux ports
        return normally illegal values (Eirik Nygaard).
* Add common functions for computing the ethernet CRC, work 
        by Joerg, taken from NetBSD.
* Add support for additional AGP bridges - taken from FreeBSD-5.
* Add support for the 're' network device.
* Bring OHCI and EHCI up-to-date with NetBSD.
* Miscellaneous driver fixes to ips, usb (ugen), sound support.
* Miscellaneous Linux emulation work, by David Rhodus, taken
        from FreeBSD-SA-04:13.linux.


## Sun 27 June 2004

* We are going to release 1.0RC1 tonight.
* Implement interrupt livelock detection and rate limiting.  It's
        still a bit raw, but it does the job (easily testable by plugging
        and unplugging cardbus cards at a high rate).  The intent is to
        try to make the system more survivable from interrupt routing and
        other boot-time configuration issues, and badly written drivers.
* Implement an emergency polling mode for the VR device if its
        interrupt does not appear to be working.
* Implement dual console (screen and serial port) support by
        default for boot2 and the loader.


## Mon 21 June 2004

* Joerg has brought GCC-3.4-20040618 in and it is now hooked up
        to the build.  GCC-3.3 will soon be removed.  To use GCC-3.4
        'setenv CCVER gcc34'.
* The world and kernel now builds with gcc-3.4.  The kernel builds
        and runs with gcc-3.4 -O3, but this is not an officially supported
        configuration.
* More M_NOWAIT -> M_INTWAIT work.  Most of the drivers inherited
        from FreeBSD make aweful assumptions about M_NOWAIT mallocs
        which cause them to break under DragonFly.
* /usr/bin/ps now reports system thread startup times as the boot
        time instead of as Jan-1-1970.  The p_start field in pstats has
        been moved to the thread structure so threads can have a start
        time in the future - Hiten.
* Zero the itimers on fork() - Hiten / SUSv3 compliance.
* MMX/XMM kernel optimizations are now on by default, greatly
        improving bcopy/bzero/copyin/copyout performance for large (>4K)
        buffers.
* A number of revoke() related panics have been fixed, in particular
        related to 'script' and other pty-using programs.
* The initial MSFBUF scheme (multi-page cached linear buffers)
        has been committed and is now used for NFS requests.  This is
        part of the continuing work to eventually make I/O devices
        responsible for any KVM mappings (because most just set up DMA
        and don't actually have to make any) - Hiten.
* Continuing ANSIfication work by several people - Chris Pressey.
* Continuing work on the LWKT messaging system.  A number of bugs
        in the lwkt_abortmsg() path have been fixed.
* The load average is now calculated properly.  Thread sleeps were
        not being accounted for properly.
* Bring in a number of changes from FreeBSD-5: try the elf image
        activator first.
* Fix a number of serious ref-counting and ref holding bugs in
        procfs as part of our use of XIO in procfs - GeekGod and Matt
* Use network predicates for accept() and connect() (using the
        new message abort functionality to handle PCATCH) - Jeff.
* Convert netproto/ns to use the pr_usrreqs structure.
* Implement markers for traversing PCB lists to fix concurrency
        problems with sysctl.
* Implement a lwkt_setcpu() API function which moves a thread
        to a particular cpu.  This will be used by sysctl to iterate
        across cpus when collecting per-cpu structural information.
* Redo netstat to properly iterate the pcb's across all cpus.
* Significant mbuf cleanup - dtom() has now been removed, and
        a normal malloc() is used for PCB allocations and in other places
        where mbufs were being abused for structural allocations.
* dup_sockaddr() now unconditionally uses M_INTWAIT instead of
        conditionally using M_NOWAIT, making it more reliable.
* Fix a number of USB device ref counting issues and fix issues
        related to UMASS detaching from CAM while CAM is still active,
        and vice-versa.
* Optimize kern_getcwd() some to avoid a string shifting bcopy().
* Continued work on asynch syscalls - track pending system calls
        and make exit1() wait for them (abort support will be forthcoming).
* **Add a negative lookup cache for NFS.**  This makes a huge
        difference for things like buildworlds where /usr/src is NFS
        mounted, reducing (post cached) network bandwidth to 1/10 what
        it was before.
* Add the '-l' option to the 'resident' command, listing all
        residented programs and their full paths (if available).  -Hiten.
* **Implement the 'rconfig' utility (see the manual page)** - for
        automatic search/config-script downloading and execution, which
        makes installing a new DFly box from CDBoot a whole lot easier
        when you are in a multi-machine environment.
* Revamp the BIO b_dev assignment and revamp the 'disk' layer.
        Instead of overloading the raw disk device the disk layer now
        creates a new device on top of the raw disk device and takes over
        the (user accessible) CDEV (major,minor).  The disk layer does
        its work and reassigned b_dev to the raw device.  biodone() now
        unconditionally setes b_dev to NODEV and all I/O ops are required
        to initialize b_dev prior to initiating the op.  This is
        precursor work to our DEV layering and messaging goal.
* Fix the rootfs search to specify the correct unit number rather
        then using unit 0, because CDEVSW lookups now require a valid
        minor number (CDEVSW's are now registered with a minor number
        range and the same major number can be overloaded as long as the
        minor ranges do not conflict).  Fix by Hiroki Sato.
* Fix a wiring related page table memory leak in the VM system.
* Fix a number of ^T related panics.
* Properly ref-count all devices.



## Sun 2 May 2004

* NEWTOKENs replace old tokens.  The new token abstraction provides
        a serialization mechanism that persists across blocking conditions.
        This is not a lock, but more like an MP-capable SPL, in that 
        if you block you will lose serialization but then regain it when
        you wakeup again.  This means that newtokens can be used for
        serialization without having to make lower level subsystems 
        aware of tokens held by higher level subsystems in the call
        stack.  This represents a huge simplification over the FreeBSD-5
        mutex model.
* Support added for the Silicon Image SATA controller.
* DragonFly now supports 16 partitions per slice (up from 8).
* Wildcarded sockets have been split from the TCP/UDP connection
        hash table, and the listen table is now replicated across 
        cpus for lockless access.
* UDP sendto() without a connect no longer needs to make a 
        temporary connect inside the kernel, greatly improving UDP
        performance in this case.
* NFS performance has been greatly improved.
* Fix some major bugs in the USB/SIM code, greatly improving
        the reliability of USB disk keys and related devices.
* NEWCARD has been brought in from FreeBSD-5.
* A bunch of userland scheduler performance issues have been fixed.
* Major syscall procedural separation has been completed, separating
        the user interfacing portion of a syscall from the in-kernel
        core support, allowing the core support functions to be directly
        called from emulation code instead of using the stackgap junk.
* An optimized MMX and XMM kernel bcopy has been implemented and
        tested.  Most of i386/i386/support.s has been rewritten and a
        number of FP races in that and npxdna() have been closed.
* Brought in the SFBUF facility from FreeBSD-5, including all of
        Alan Cox's (the FBsd Alan Cox) improvements, plus additional
        improvements for cpu-localized invlpg calls (and the ability
        to avoid such calls when they aren't needed).
* A major PIPE code revamp has occured, augmenting the SFBUF
        direct-copy feature with a linear map.  Peak standard pipe
        throughput with 32KB buffers on an AMD64 3200+ now exceeds
        4GBytes/sec.
* Implement XIO, which is a multi-page buffer wrapper for SFBUFs
        and will eventually replace linear buffer management in the
        buffer cache as well as provide linear buffer mappings for other
        parts of the system.
* Added a localized cpu pmap_qenter() called pmap_qenter2() which
        is capable of maintaining a cpumask, to avoid unnecessary invlpg's
        on target-side linear maps.  It is currently used by the PIPE
        code and the CAPS code.
* Joerg has brought in most of the KOBJ extensions from FreeBSD-5.
* Major continuing work by Jeff on the threading and partitioning
        of the network stack.  Nearly the whole stack is now
        theoretically MP safe, with only a few niggling issues before we
        can actually start turning off the MP lock.
* The last major element of the LWKT messaging system, 
        lwkt_abortmsg() support, is now in place.  Also it is now possible
        to wait on a port with PCATCH.
* Hiten has revamped the TCP protocol statistics, making them 
        per-cpu along the same lines that we have made vmstats per-cpu.
* propolice has been turned on by default in GCC3.
* CAPS (DragonFly userland IPC messaging) has been revamped to
        use SFBUFs.
* acpica5 now compiles, still needs testing.
* SYSTIMERS added, replacing the original hardclock(), statclock(),
        and other clocks, and is now used as a basis for timing in the
        system.  SYSTIMERS provide a fine-grained, MP-capable,
        cpu-localizable and distributable timer interrupt abstraction.
* Fix RTC write-back issues that were preventing 'ntpdate' changes
        from being written to the RTC in certain cases.
* Finish most of the namecache topology work.  We no longer need
        the v_dd and v_ddid junk.  The namecache topology is almost 
        ready for the next major step, which will be namespace locking
        via namecache rather then via vnode locks.
* Add ENOENT caching for NFS, greatly reducing the network overhead
        (by a factor of 5x!!!) required to support things like
        buildworld's using an NFS-mounted /usr/src.
* Jeff has added predicate messaging requests to the network
        subsystem, which allows us to convert situations which normally
        block, like connect(), to use LWKT messages.
* Lots of style cleanups, primarily by Chris Pressey.



## Sun 15 February 2004

* Newcard is being integrated.
* A longstanding bug in PCI bus assignments which affects larger
        servers has been fixed.
* The IP checksum code has been rewritten and most of it has been
        moved to machine-independent sections.
* A general machine-independent CPU synchronization and rendezvous
        API has been implemented.  Older hardwired IPIs are slowly being
        moved to the new API.

* A new 'SysTimer' API has been built which is both MP capable
        and fine-grained.  8254 Timer 0 is now being used for fine-grained
        timing, while Timer 2 is being used for timebase.  Various 
        hardwired clock distribution code is being slowly moved to the
        new API.  hardclock and statclock have already been moved.
* A long standing bug in the NTP synchronization code has been fixed.
        NTPD should now lock much more quickly.
* Clock interrupt distribution has been rewritten.  Along with this,
        IPI messaging now has the ability to pass an interrupt frame
        pointer to the target function.  Most of the old hardwired 
        clock distribution code has been ripped out.
* nanosleep() is now a fine-grained sleep.  After all, what's the
        point of having a nanosleep() system call which is only capable
        of tick granularity?
* Critical fixes from FreeBSD RELENG_4 integrated by Hiten Pandya.
* Firewire subsystem updated by a patchset from Hidetoshi Shimokawa.

* USB subsystem has been synced with FreeBSD 5 and NetBSD.
* GCC 3.3.3 and Binutils 2.14 have been integrated into base.
* An aggregated Client/Server Directory Services syscall API has
        been completed.
* An amiga-style 'resident' utility program + kernel support has 
        been implemented, and prelinking support has been removed 
        (because the resident utility is much better).  You can make any
        dynamically loaded ELF binary resident with this utility.  The
        system will load the program and do all shared library mappings 
        and relocations, then will snapshot the vmspace.  All future
        executions of the program simply make a copy of the saved
        vmspace and skip almost right to main().  Kernel overhead is
        fairly low, also.  It still isn't as fast as a static binary
        but it is considerably faster then non-resident dynamic binaries.


## Mon 1 December 2003

A great deal of new infrastructure is starting to come to fruition.


* We have a new CD release framework (/usr/src/nrelease) in.
        Development on the new framework is proceeding.  Basically the
        framework is based on a fully functioning live CD system
        and will allow us to build a new installation infrastructure
        that is capable of leveraging all the features available in
        a fully functioning system rather then being forced to use
        a lobotomized set.
* A new IPC framework to reliably handle things like password
        file lookups is proceeding.  This framework is intended to
        remove the need for DLL or statically-linked PAM/NSS and at
        the same time make maintainance and upgrades easier and more
        portable.
* The FreeBSD-5 boot infrastructure has been ported and is now
        the default.
* RCNG from FreeBSD-5 has been ported and is now the default.
* Work is proceeding on bringing in ATAng from FreeBSD-4, with
        additional modifications required to guarantee I/O in low
        memory situations.  That is, it isn't going to be a straight
        port.  The original ATA code from FreeBSD-4.8, which we call
        ATAold, has been given interim fixes to deal with the low memory
        and PIO backoff issues so we don't have to rush ATAng.


## Sat 18 October 2003

Wow, October already!  Good progress is being made on several fronts.

* K&amp;R function removal.
* VM function cleanups by Hiten Pandya.
* General kernel API cleanups by David Rhodus.
* Syscall Separation work by David Reese.

* Removal of stackgap code in the Linux Emulation by David Reese.
* Networking work by Jeffrey Hsu.
* Interrupt, Slab Allocator stabilization.
* Introduction of _KERNEL_STRUCTURES ... a better way for 
        userland programs to access kernel header files rather
        then them setting _KERNEL.
* Bring the system uptodate on security issues (David Rhodus, others)
* NFS peformance improvements by David Rhodus and Hiten Pandya.

* GUPROF and kldload work in the kernel by Hiten Pandya.
* Major progress on the checkpointing code in the kernel
        primarily by Kip Macy.
* All work through this moment has been stabilized with major
        input from David Rhodus.


Matt's current focus continues to be on rewriting the namecache code.
Several intermediate commits have already been made but the big changes
are still ahead.

Galen has started experimenting with userland threads, by porting the
LWKT subsystem (which is mostly self contained) to userland.

## Wed 27 August 2003 - Slab Allocator, __P removal


* DragonFly now has slab allocator for the kernel!  The allocator is
    about 1/3 the size of FreeBSD-5's slab allocator and features per-cpu
    isolation, mutexless operation, cache sensitivity (locality of reference),
    and optimized zeroing code.
    
* The core of the slab allocator is MP safe but at the moment we still
    use the malloc_type structure for statistics reporting which is not
    yet MP safe, and the backing store (KVM routines) are not MP safe.
    Even, so making the whole thing MP safe is not expected to be difficult.
    
    
* Robert Garrett has made great process removing __P(), Jeffrey has been
    working on the nework stack, David has been backporting bug fixes from
    FreeBSD and doing other cleanups, and Hiten and Jeroen have been
    investigating documentation and source code reorganization.


## Sun 10 August 2003 - Source Reorganization

* A major source tree reorganization has been accomplished, including 
    separation of device drivers by functionality, moving filesystems into
    a vfs/ subdirectory, and the removal of the modules/ subdirectory with
    an intent to integrate the module makefiles into the normal sys/ 
    tree structure.
    
* Work on syscall messaging is ongoing and we will soon hopefully have
    a fully working demonstration of asynch messaging.


## 09 July 2003 to 22 July 2003 - Misc work, DEV messaging

* A large number of commits related to the messaging infrastructure have
    been made, and DEV has been message encapsulated (though it still runs
    synchronously).
    
* Announced the official start of work on the userland threading API:
    <a href="misc/uthread.txt">misc/uthread.txt</a>



## 27 June 2003 to 09 July 2003 - MP operation

This section contains work completed so far.  Some items have not yet
been integrated into the next section up.

* **(done)** Get it so user processes can run simultaniously
        on multiple cpus.  User processes are MP, the kernel is still
        mostly UP via the MP lock.
* **(done)** Run normal interrupts and software interrupts
        in their own threads.

* **(done)** Implement interrupt preemption with a
        block-return-to-original-thread feature (which is more
        like BSDI and less like 5.x).
* **(done)** Finish separating the userland scheduler
        from LWKT.  The userland scheduler now schedules one LWKT
        thread per cpu.  Additionally, the realtime, normal, and
        idle priority queues work as expected and do not create
        priority inversions in the kernel.  Implement a strict
        priority+rr model for LWKTs and assign priorities to
        interrupts, software interrupts, and user processes running
        in kernel mode.  Deal with ps, systat, and top.  Fix
        bugs in the sysctl used to retrieve processes.  Add threads
        to the information returned by said sysctl.
* Replace the UIO structure with a linked list of VM objects, 
        offsets, and ranges, which will serve for both system and
        user I/O requests.
* Move kernel memory management into its own thread(s),
        then pull in the SLAB allocator from DUX3, implement a
        per-cpu cache, and get rid of zalloc*().
* Implement virtual cpus, primarily for testing purposes.

* (done) Separate scheduling of user processes from the
        LWKT scheduler.
        i.e. only schedule one user process in the LWKT scheduler at
        a time per cpu.
* Change over to a flat 64 bit I/O path.
* (done) Get real SMP working again... implement the token
        transfer matrix between cpus, keep the BGL for the moment but
        physically move the count into the thread structure so it
        doesn't add (much) to our switching overhead.
* Fix BUF/BIO and turn I/O initiation into a message-passing
        subsystem.  Move all DEVices to their own threads and
        implement as message-passing.  VFS needs a major overhaul
        before VFS devices can be moved into their own threads to
        the reentrant nature of VFS.


## 17 June 2003 to 26 June 2003

* Add light weight kernel threads to the tree.

This work has been completed.  It involved creating a clearly defined
thread/process abstraction.

* **(done)** embed a thread structure in the proc structure.
* **(done)** replace the curproc global with curthread, create
        macros to mimic the old curproc in C code.
* **(done)** Add idlethread.  curthread is never NULL now.
* **(done)** replace the npxproc global with npxthread.

* **(done)** Separate the thread structure from the proc structure.
* **(done)** remove the curpcb global.  Access it via curthread.
        ('curthread' will be the only global that needs to be
        changed when switching threads.  Move the PCB to the end
        of the thread stack.
* **(done)** npxproc becomes npxthread.
* **(done)** cleanup globaldata access.

* **(done)** Separate the heavy weight scheduler from the thread
        scheduler and make the low level switching function operate
        directly on threads and only threads.  Heavy weight process
        switching (involving things like user_ret, timestamps,
        and so forth) will occur as an abstraction on top of the
        LWKT scheduler.  swtch.s is almost there already.
        The LWKT switcher only messes with basic registers and
        ignores the things that are only required by full blown
        processes ( debug regs, FP, common_tss, and CR3 ).  The heavy
        weight scheduler that deals with full blown process contexts
        handles all save/restore elements.  LWKT switch times are
        extremely fast.
* **(done)** change all system cals from (proc,uap) to (uap).
* **(done)** change the device interface to take threads instead of
        procs (d_thread_t is now a thread pointer).  Change the
        select interface to take thread arguments instead of procs
        (interface itself still needs to be fixed).  Consolidate
        p_cred into p_ucred.  Consolidate p_prison into p_ucred.
        Change suser*() to take ucreds instead of processes.
* **(done)** Move kernel stack management to the thread structure.
        Note: the kernel stack may not be swapped.  Move the pcb to
        the top of the kernel stack and point to it from
        the thread via td_pcb (similar to FreeBSD-5).

* **(done)** Get rid of the idiotic microuptime and related
        crap from the critical path in the switching code.
        Implement statistical time statistics from the stat clock
        interrupt that works for both threads and processes without
        ruining switching performance (very necessary since there
        is going to be far more kernel->kernel done with this
        design, but it also gets rid of a serious eyesore that
        has been in the FreeBSD tree for a long time).
* **(done)** Translate most proc pointers into thread pointers
        in the VFS and DEV subsystems (which took all day to do).
* **(done)** Cleanup VFS and BUF.  Remove creds from calls that should
        not pass them, such as close, getattr, vtruncbuf, fsync, and
        createvobject.  Remove creds from struct buf.  All of the
        above operations can be run in any context, passing the
        originator's cred makes no sense.
* **(95% done and tested)** Remove all use of **curproc** and
        **curthread** from the VFS
        and DEV subsystems in preparation for moving them to
        serializable threads.  Add thread arguments as necessary.

* **(95% done and tested)** Finish up using thread references
        for all subsystems that
        have no business talking to a process.  e.g. VM, BIO.
        Deal with UIO_COPY.
* **(done)**Make tsleep/wakeup work with pure threads.
* **(done, needs more testing. buildworld succeeds on test box)**
        Move kernel threads (which are implemented as heavy-weight
        processes to LWKT threads).


## 16 June 2003 - 

* Completed repository fork, $Tag change, and various cleanup.

* Creating a new repository required a bit of work.  First the RELENG_4
    tree had to be checked out.  Then a new cvs repository was created
    with a new cvs tag.  Then a combination of scripts and manual work
    (taking all day) was used to move the $FreeBSD tags into comments
    and add a new tag to all the source files to represent the new 
    repository.  I decided to cleanup a large number of FBSDID and
    rcsid[] declarations at the same time, basically moving all tag
    descriptions into comments with the intent that a linking support
    program would be written later to collect tags for placement in
    binaries.  Third party tags in static declarations which contained
    copyright information were retained as static declarations.
    
* Some minor adjustments to the syscall generator was required, and
    I also decided to physically remove UUCP from the tree.
    
* Finally, buildworld and buildkernel were made to work again and
    the result was checked in as rev 1.2 (rev 1.1 being the original
    RELENG_4 code).