home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Magazyn Amiga Shareware Floppies
/
ma30.dms
/
ma30.adf
/
VMM
/
doc
/
HISTORY
< prev
next >
Wrap
Text File
|
1994-09-23
|
6KB
|
153 lines
$Date: 94/09/23 16:23:53 $
V1.0: This is the first release
V1.0b: Bug fix: Unit 0 of the paging device was always used instead of the
given unit.
Bug fix: In case of an error "Reboot" didn't work.
V1.1: Now runs on non-A4000 machines. Sets up its own MMU table,
if necessary.
Statistics window is font-sensitive now
Dynamic memory allocation policy implemented
Now up to 64 MB of virtual memory possible
Now supports both 4K and 8K pages (two program versions)
Paging to a file implemented
Separate program for printing out statistics is available now
("VMM40Stat")
Disk access time reduced.
V1.2: Fixed a bug which caused VMM40 to crash the machine when paging to
a file with its name longer than 20 characters.
V1.1 tried to improve system consistency by disabling allocation of
VM inside forbidden/disabled sections. This caused programs which
do an AvailMem (); AllocMem () inside a Forbid/Permit to fail on
VM allocations (e.g. ADPro). Removed in V1.2.
A small program "ShowPageSize" has been added to determine which
pagesize is possible on your system.
Maximum VM size has been increased to 128 MB as requested.
A programmer's library has been added for exclusive use of
virtual memory.
V1.3: FreeMem now marks the freed pages as empty resulting in less paging
on freeing memory. Unfortunately this breaks tools such as MungWall
which writes to memory it hasn't allocated.
Fixed a bug which caused strange behaviour during disk IO using
multiple units sharing the same device. This was probably responsible
for some strange misbehaviours when rendering text and icons.
The preferences are now changeable while VMM40 is running.
All parameters except the paging device/file and the page-file size
will be immediately changed by VMM40.
An advanced section for memory allocation has been added to
VMM40Prefs. You can now determine the minimum size for VM allocations
for PUBLIC and non-PUBLIC requests separately.
Reduced VMM's usage of signals on behalf of other tasks. There were
problems with tasks who had all their signals already allocated.
The Wait function had to be patched in order to avoid problems
with tasks which have a stack in VM.
You can now exit VMM40 even if there's VM still allocated. In this
case VMM40 will try to page in all this memory and set up the
MMU tables accordingly, after which it will quit.
Now writes out modified pages before it needs to resulting
in better average page-fault service times.
Added a reset handler which inhibits a reset until paging currently
going on has finished. This prevents the validate procedure after
reset if you are paging to a file.
Fixed a bug which caused VMM40 to hang when writing the first page
to DMA-driven harddisks.
Some minor changes and cleanups.
V2.0: VMM runs on the 68030. Consequently VMM40 has been renamed to VMM.
Implemented so-called pseudo-partitions, which look like a file
but can be accessed with the speed of a partition.
VMM is a commodity in V2.0 using a hotkey to display its GUI.
Consequently the setup of V2.0 has changed a bit. VMM40 has
been moved to L:VMM-Handler and VMM40Prefs is now simply called
VMM. The VMM: assign and the StartVMM program have become obsolete.
Hopefully fixed bugs having to do with paging to DMA devices
(Patched CachePreDMA and CachePostDMA)
The GUI has changed a bit to make room for some additionally needed
gadgets.
VMM now patches Workbench's title bar to include the amount of free
VM. There's a configuration button to enable or disable this feature.
Better exit handling if there's still VM allocated.
Miscellaneous minor changes and bug fixes
V2.0a: Fixed a small but nasty bug I introduced shortly before the release
of V2.0 when converting from GCC 2.5.7 to GCC 2.6.0. This caused
VMM to crash when paging to a partition was used for the first time.
Subsequent uses of partition paging worked OK.
Also corrected a minor mistake that caused the VMM window not to be
updated after certain menu function were invoked.
V2.1: AvailMem now returns amount of free public memory if task is not
permitted to use virtual memory.
Fixed a bug in the startup code which caused VMM to crash if the
preferences file wasn't found. Now a requester is displayed.
Fixed a bug in the Installer script which caused the default
configuration file not to be copied.
Implemented a write buffer to write multiple pages to disk.
Although this involves copying the pages to the buffer it generally
results in a quite noticeable speed improvement.
Deleted the memory option for paging to the largest available chunk
since no-one ever seems to use it.
Paging to a file is speeded up significantly by using additional
buffers for the filesystem. FFS and OFS are very inefficient on
seeking on long files. VMM installs as many buffers as are needed
to keep the file list blocks of the paging file in memory.
Other file systems such as the MSDOS filesystem don't need this.
FreeMem now marks the freed pages as unused instead of invalid.
Previously subsequent accesses to that range of memory resulted
in a page-fault without any disk access but the overhead for
page-fault handling.
Corrected font calculation for statistics window.
Improved error handling.
Fixed a hard to find bug which could cause spurious crashes on
68030 systems with a 68882. I underestimated the amount of
data which is pushed onto the stack during a context switch if
the FPU is busy.
Added support for external statistics displays. You can now write
your own (possibly graphical) statistics output for VMM.
Worked around a DOS bug which caused failure to use pseudo-partitions
on partitions with the same volume and device name.