flag -- in fact we were setting it -- so after the first syscall with 64
bit return value we were always taking the slow kernel exit.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23609 a95241bf-73f2-0310-859d-f6bbb57e9c96
* "traced" command:
- Was printing one more entry than asked to.
- Fixed broken index handling. They were starting at 0, but the last
one was sEntries nevertheless. We consistently let them start at 1,
now. 0 can be passed as special index, causing the last entries to
be printed.
- Added options "backward"/"forward" which will print the entries
preceding respectively succeeding the ones printed on the previous
invocation. The command is continuable in this case, i.e. simply
pressing RET afterwards will reinvoke the command, allowing for
comfortable scrolling through a long list of entries.
- Added detailed usage message.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23607 a95241bf-73f2-0310-859d-f6bbb57e9c96
* With post syscall debugging enabled, the x86 syscall handling didn't
remove all parameters from the stack after calling the respective user
debugger hook. Should have been harmless though, since the following
code didn't rely on the stack being in order.
* Added syscall pre/post (kernel) tracing functions
trace_{pre,post}_syscall(). They are generic, but need to be invoked
by the architecture specific syscall code. Currently only done for
x86.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23600 a95241bf-73f2-0310-859d-f6bbb57e9c96
since that's seriously unhealthy.
* Added TODO that uninitialized entries must not be discarded.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23599 a95241bf-73f2-0310-859d-f6bbb57e9c96
invoke_debugger_command() is now automatically preceded by
"usage: <command name>", so the string passed to
add_debugger_command_etc() shouldn't contain it anymore.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23584 a95241bf-73f2-0310-859d-f6bbb57e9c96
before releasing our cache reference. Otherwise removing a vnode (triggered
by releasing the cache in our thread) could need pages we still own.
* Put the caches and pages into a union to save stack space; they are not
needed at the same time.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23580 a95241bf-73f2-0310-859d-f6bbb57e9c96
add_debugger_command(), but additionally takes parameters "usage"
and "flags".
* Added add_debugger_command_alias() which creates another name for an
existing command.
* Added print_debugger_command_usage() to print a command's usage.
* invoke_debugger_command() intercepts invocations with "--help" and
prints the command's usage text, if it is known. If unknown, the
command will be called normally.
* Made use of the new functions in debug.cpp.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23573 a95241bf-73f2-0310-859d-f6bbb57e9c96
a command is executed anymore. Instead the least recently used
temporary variable is overwritten, if there's no free slot for a new
temporary variable.
* Removed the special handling for the command result variable ("_"). It
just works like any other temporary variable, now.
* Individual temporary variables can be removed (e.g. using the "unset"
command).
* Added unset_all_debug_variables() and "unset_all" command to unset
all persistent and temporary variables.
* Removed remove_all_temporary_debug_variables and renamed
remove_debug_variable() to unset_debug_variable().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23568 a95241bf-73f2-0310-859d-f6bbb57e9c96
(so we can't allocate more physical pages than virtual address space
anymore, but so what?).
* Used the new CACHE_LARGE_SLAB flag as a temporary work-around; else
the slab would easily create several thousands of areas, which our
area code (and kernel heap) can't really handle that well (gets
awfully slow).
* Block caches with the same size could share the same slab, but we
don't do that yet.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23567 a95241bf-73f2-0310-859d-f6bbb57e9c96
paging support to KDL (but not the on-screen debug output for now).
* Defaults to "on", use the new "paging" KDL command to turn it off (or on
again).
* When pressing 'q' while it is waiting for a key, it will now eat the rest
of the commands output (helpful for slow screen output of a large data set).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23566 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Fixed the usage text of the "help" KDL command.
* Made the "ambiguous command" warning shorter, so that it will still fit in
the exception buffer.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23565 a95241bf-73f2-0310-859d-f6bbb57e9c96
* As a temporary work-around for the current slab allocator's area usage,
I added the CACHE_LARGE_SLAB flag, which will force the allocator to
use larger areas.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23564 a95241bf-73f2-0310-859d-f6bbb57e9c96
value greater or equal its size (actually untested, but at least Haiku
still boots with these changes :-)).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23563 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Added some temporary variables to the commands.
* Use parse_expression() where appropriate.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23556 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Fixed removing temporary variables (they would always be removed except one
after the first command).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23555 a95241bf-73f2-0310-859d-f6bbb57e9c96
debugger expression language. By default it reads a uint32 value.
Another target size (1, 2, 4, or 8 bytes) can be specified in braces
after the "*" (e.g. "*{2}address" for uint16).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23551 a95241bf-73f2-0310-859d-f6bbb57e9c96
* The kernel debugger does now define some temporary variables when
entered (current thread and team, etc.).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23549 a95241bf-73f2-0310-859d-f6bbb57e9c96
that is a little more powerful than BeOS'. It features:
- Persistent and temporary uint64 variables. The former kind is set
only by the user. The latter (those prefixed "_") can be set
automatically by commands, thus e.g. making it easier to access
members of a dumped structure. They are unset when the next command
is invoked. The special temporary variable "_" is defined as a
command's return value.
- Expressions can contain nested command invocations using brackets
("[ ... ]").
- Command lines are parsed by the expression parser, too. They can
contain command invocations (in brackets) and expressions (in
parentheses).
* Added debugger commands:
- expr: Evaluates the given expression and prints the result.
- unset: Undefines a variable.
- vars: Prints the values of all defined variables.
* Moved debugger command code into its own source file.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23546 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Made the block_cache KDL command dump a bit more useful info (number of
referenced and dirty blocks).
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23540 a95241bf-73f2-0310-859d-f6bbb57e9c96
* with 1 GB or more, the semaphore limit is now 131072 instead of 65536.
* double the heap when there is 1 GB or more (64 MB).
* the low memory handler now also watches semaphore usage; in the end,
we need a low resource handler, not a low memory handler.
* create_sem_etc() no longer calls vfs_free_unused_vnodes() directly as
this could actually deadlock (at least because the address space is a
R/W lock, not a recursive lock).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23538 a95241bf-73f2-0310-859d-f6bbb57e9c96
when a pattern was involved).
* alloc_tracing_buffer() no longer allocates anything when you ask for
a zero byte buffer.
* Fixed warning.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23533 a95241bf-73f2-0310-859d-f6bbb57e9c96
* improved the "block_cache" KDL command: it can now also dump blocks,
added support for the "--help" argument.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23532 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Don't execute a command anymore, if the given prefix is ambiguous.
* Added tab completion for commands.
* Added on-the-fly help while typing a command line. It is triggered
by pressing tab at a position after the space following the command.
It is implemented by calling the command with argument "--help", which
doesn't work yet with most commands, but some already print their
usage in this case.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23521 a95241bf-73f2-0310-859d-f6bbb57e9c96
now, not the number of entries shown (much more usable this way).
* Added missing license.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23520 a95241bf-73f2-0310-859d-f6bbb57e9c96
system when pressed during the boot process, as intended.
* Removed other incorrect key codes, except the one for BREAK, since it
is used (but won't work).
* Ctrl-Alt-Del now also resets the machine when in KDL, at least when
waiting for user input.
* arch_debug_blue_screen_getchar() does also generate the respective
escape sequences for HOME, END, and DELETE, now. Furthermore it
generates characters for Ctrl-A through Ctrl-Z.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23512 a95241bf-73f2-0310-859d-f6bbb57e9c96
any devices anymore it gets unloaded. Also made sure the function pointers
are properly initialized and disabled debug output.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23494 a95241bf-73f2-0310-859d-f6bbb57e9c96
transaction ends or has been aborted.
* BFS now listens for transactions when it created an inode to see if
the transaction will be aborted without freeing the inode (in which
case it will panic for now).
* Started implementing tracing support, but it's not working yet.
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23492 a95241bf-73f2-0310-859d-f6bbb57e9c96
though there was nothing to do (if 'diff' was larger than 'needed').
* Improved KDL command output.
* Added debug output to the allocation functions.
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23491 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Added function to allocate space in the buffer.
* Dump() now fills a buffer instead of printing its data directly.
* This allows the new "#pattern" argument of the "traced" command to
work. When you're using that, the index of the trace entry is printed
out, too, so that you can then get a full dump around the hits.
* Added an AddDump() method to the AbstractTraceEntry class so that
there is no need to call the inherited function anymore.
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23479 a95241bf-73f2-0310-859d-f6bbb57e9c96
will not accept if the allocator returns NULL and crashes instead
(ie. not compiling in tracing would have crashed if some module tried
to use it).
* Added total entries count to the KDL command output.
* Fixed computing the start index of the KDL command.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23460 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Implemented an optional tracing layer that can be used in the kernel.
Nice to use if you don't have serial output or need something that doesn't
slow down the system as much.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23447 a95241bf-73f2-0310-859d-f6bbb57e9c96
* vfs_disconnect_vnode() did not put away its vnode reference.
* disconnect_mount_or_vnode_fds() did always throw the current working
directory of all apps on the same mount away, even if only a specific
vnode should have been disconnected.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23445 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Cache the looked up image symbols as well as the API version in the driver entry
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23441 a95241bf-73f2-0310-859d-f6bbb57e9c96
23139 into trunk, with roughly the following changes (for details svn
log the branch):
* The int 99 syscall handler is now fully in assembly.
* Added a sysenter/sysexit handler and use it on Pentiums that support
it (via commpage).
* Got rid of i386_handle_trap(). A bit of functionality was moved into
the assembly handler which now uses a jump table to call C functions
handling the respective interrupt.
* Some optimizations to get user debugger support code out of the
interrupt handling path.
* Introduced a thread::flags fields which allows to skip handling of
rare events (signals, user debug enabling/disabling) on the
common interrupt handling path.
* Got rid of the explicit iframe stack. The iframes can still be
retrieved by iterating through the stack frames.
* Made the commpage an architecture independent feature. It's used for
the real time data stuff (instead of creating a separate area).
* The x86 CPU modules can now provide processor optimized versions for
common functions (currently memcpy() only). They are used in the
kernel and are provided to the userland via commpage entries.
* Introduced build system feature allowing easy use of C structure
member offsets in assembly code.
Changes after merging:
* Fixed merge conflict in src/system/kernel/arch/x86/arch_debug.cpp
(caused by refactoring and introduction of "call" debugger command).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23370 a95241bf-73f2-0310-859d-f6bbb57e9c96
resized but still had dirty pages to be written back,
vm_cache_resize() (which is called with the inode lock being held)
deadlocked with the page writer.
* Now, I reintroduced busy_writing: it'll be set by everything that
writes back pages (vm_page_write_modified(), and the page writer),
and will be checked for in vm_cache_resize() - other functions are not
affected for now, AFAICT.
* vm_cache_resize() will clear that flag, and the writer will check it
again after it wrote back the page (which will fail when it's outside
the file bounds), and if it's cleared, it will get rid of the page
(if the file has been resized again in the mean time, writing it will
succeed then, and we'll keep the page around).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23334 a95241bf-73f2-0310-859d-f6bbb57e9c96
appear: when freeing a modified page, it wouldn't have a cache
anymore, but set_page_state_nolock() depended on it.
* To work around this, I added a vm_page_free() function, which the
caches that free modified pages have to call (but others may, too).
It will correctly maintain the sModifiedTemporaryPages counter in case
the cache has already been removed.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23318 a95241bf-73f2-0310-859d-f6bbb57e9c96
a function in the stack trace (only works reliably when a stack frame
is exists, and you'll have to know the number of arguments).
* Refactored the functions a bit and extracted setup_for_thread() out
of stack_trace() to be used by show_call() as well.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23316 a95241bf-73f2-0310-859d-f6bbb57e9c96
NULL (it's not used anywhere yet, anyway).
* Fixed warning when compiling with tracing turned on.
* Some cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23267 a95241bf-73f2-0310-859d-f6bbb57e9c96
set when the first chunk of the file could be read in directly, causing it
to read data to a wrong place in the buffer.
* Reading in the first chunk directly would have also only worked if vecIndex
and vecOffset was 0 when calling the function.
* Applied the fs_shell changes in file_map to the kernel version as well (the
constructor already worked correctly, though).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23265 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Insert the pause op in all spin wait loops (as macro for platform independent sources or as inline assembly on x86 only files)
* Fix some warnings with tracing on and extended some output
* Minor cleanups here and there
The pause instruction is implemented since P4 systems but is fully backwards compatible (it's a no-op prior to P4). According to Intel specs it reduces performance penalties as memory order violations can be avoided. Also power consumption is reduced. Most of all this will be beneficial to hyper-threading systems as it frees resources to the other logical processor when one logical processor executes a fast spinning loop.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23141 a95241bf-73f2-0310-859d-f6bbb57e9c96
the inode's internal last modified and size copies, causing in inconsistent
data. This fixes#1643.
* The block being replayed are now dumped to the debug output.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23050 a95241bf-73f2-0310-859d-f6bbb57e9c96
team ID argument, instead of only being able to dump the images of the current
team.
* The debugger commands are now now also built-in without the DEBUG flag set
(for now).
* _get_next_image_info() now also supports the B_SYSTEM_TEAM constant.
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23011 a95241bf-73f2-0310-859d-f6bbb57e9c96
exit status of (non-main) threads of a team. Fixes bug #1644.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23009 a95241bf-73f2-0310-859d-f6bbb57e9c96
passes that information on to the kernel. This should fix wrong bytes per row with
certain resolutions and graphics cards.
* The boot loader now recognizes 15 bit modes that are advertised as 16 bit modes.
This should fix wrong colors in 16 bit modes on some cards.
* Reenabled setting MTRR for VESA mode - don't remember why I disabled it, but it
works fine on my test machines.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23006 a95241bf-73f2-0310-859d-f6bbb57e9c96
serial output, and puts it into the new kernel_args::debug_output field.
* syslog_init() will now check if there is anything in kernel_args::debug_output
and will put that into the syslog buffer.
* dump_block() now also prints an offset.
* Fixed warning in mmu.cpp.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23003 a95241bf-73f2-0310-859d-f6bbb57e9c96
one too low in comparison with BeOS (ie. the end pointer was inclusive, now
it's exclusive).
* Moved static functions fill_thread_info(), and {send|receive}_data_etc() to
the private function section.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22945 a95241bf-73f2-0310-859d-f6bbb57e9c96
tried to access the uninitialized vnode in that case).
* That means that it's now safe to remove a mounted CD from the drive, it
will then be unmounted automatically.
* Added a check for partition::Device() - even though Ingo tells me it's
impossible, it was NULL once.
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22922 a95241bf-73f2-0310-859d-f6bbb57e9c96
check the fTerminating flag, so it would never quit (too bad no one ever quits
it anyway :-)). Thanks for proofreading!
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22919 a95241bf-73f2-0310-859d-f6bbb57e9c96
* it now updates the partition data,
* the flags,
* and the disk geometry - and that now allows the session add-on to actually
detect a newly inserted CD.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22918 a95241bf-73f2-0310-859d-f6bbb57e9c96
the complete extent info or not.
* file_map_translate() now cuts down the request to the file bounds.
* Adjusted BFS and FAT to the API changes.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22913 a95241bf-73f2-0310-859d-f6bbb57e9c96
device geometry.
* If SetTo() reports no media, and GetGeometry() fails, the device geometry
is now reset as well.
* KDiskDeviceManager::_ScanPartition() no longer unmarks the partition busy;
this is now done by the caller, and done independently from the outcome of
_ScanPartition(). This also fixes the problem that devices with no media
were never marked unbusy (and thus were ignored subsequently).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22912 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Added vfs_unmount(), which allows unmounting by dev_t (used by the DDM).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22910 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Unmount when uninitializing a partition.
* Finished the media checker implementation, i.e. we rescan when a media
was inserted and uninitialize when ejected.
* Turned the disk device media checker from a kernel daemon into a thread.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22909 a95241bf-73f2-0310-859d-f6bbb57e9c96
that can be used by file systems.
* Changed the way the file cache works: instead of reading/writing to the
underlying device directly, it can now be used for any data source, ie.
also network file systems.
* As a result, the former pages_io() moved to the VFS layer, and can now be
called by a file system via {read|write}_file_io_vec_pages() (naming
suggestions are always welcomed :-)). It now gets an FD, and uses that to
communicate with the device (via its fs_{read|write}_pages() hooks).
* The file_cache_{read|write}() functions must now be called without holding
an I/O relevant file system lock. That allows the file cache to prepare the
pages without colliding with the page writer, IOW the "mayBlock" flag can
go into the attic again (yay!).
* This also results in a much better performance when the system does I/O and
is low on memory, as the page writer can now finally write back some pages,
and that even without maxing out the CPU :)
* The API changes put slightly more burden on the fs_{read|write}_pages()
hooks, but in combination with the file_map it's still pretty straight
forward. It just will have to dispatch the call to the underlying device
directly, usually it will just call its fs_{read|write}_pages() hooks
via the above mentioned calls.
* Ported BFS and FAT to the new API, the latter has not been tested, though.
* Also ported the API changes to the fs_shell. I also completely removed its
file cache level page handling - the downside is that device access is no
longer cached (ie. depends on the host OS now), the upside is that the code
is greatly simplified.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22886 a95241bf-73f2-0310-859d-f6bbb57e9c96
system by pretty name (not only module name) now.
* _user_initialize_partition() loads the disk system by pretty name.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22880 a95241bf-73f2-0310-859d-f6bbb57e9c96
did not propagate the "dontWait" argument, letting the page writer never wait
for its pages.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22860 a95241bf-73f2-0310-859d-f6bbb57e9c96
and write_to_cache() before, IOW the cache could reserve too few pages.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22859 a95241bf-73f2-0310-859d-f6bbb57e9c96
needed pages correctly, and would also not read/write enough in case the
offset didn't start at 0 resulting in undetected short reads/writes. It's
amazing how many bugs can be hidden in a few lines of code.
* Fixed a bug that might have been the cause for bug #1601: when the last part
of the write did not end on a page boundary, the last page had to be read
first, but that was done from the wrong offset. Also, if only parts of that
page could be read (because the file size didn't span over the whole page)
the remaining parts needed to be cleared.
* The cache_funcs were always called with the same value for numBytes and
bufferSize so I've eliminated the former.
* Large reads now also bypass the cache in case of low memory, large writes now
also only bypass the cache in that case, following Ingo's suggestion.
* Fixed compilation with debugging turned on.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22858 a95241bf-73f2-0310-859d-f6bbb57e9c96
than 64KB. Reads should probably get a similar logic, at least if memory is
tight.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22857 a95241bf-73f2-0310-859d-f6bbb57e9c96
the same pages over and over.
* Increased the priority of the page writer a bit, so that it is higher than
the one of the page daemon.
* Added a sModifiedTemporaryPages counter to let the page_writer decide how
many pages are there to write back (temporary pages would go to the swap file
and are only written back when memory is low).
* In case there are more than 1024 modified (non-temporary) pages around, the
page writer will constantly write out pages, not only when being pushed.
* The page writer now temporarily always leave out temporary pages (as long as
we don't have a swap file).
* Shuffled functions around a bit.
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on pages are recorded in a history and can be printed via the
"page_allocations" command.
* Fixed a problem in the page scrubber. It temporarily removed pages
from the free list, which could have been reserved by someone else.
When actually allocating the reserved pages, that someone could find
free and clear lists empty and would therefore rightfully panic
("Had reserved page, but there is none!").
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non-reserve case.
* vm_page_allocate_page() could also lose a stolen page in case more free pages were available
after steal_pages() was called.
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K{Disk,File,Partitioning}System writing methods. It is now required
that the caller has marked the concerned partitions busy, hence we can
(read-)access them without needing a lock. The module interfaces will
will be changed to take advantage of the fact as well. The methods take a
disk_job_id instead of a KDiskDeviceJob* now, though I haven't quite
decided, whether we need it at all or just want to add a special
handling in the cases where notifications during the operation make
sense.
* Reimplemented the disk device write support syscalls (save
_user_move_partition() for which other module hooks are needed). They
call the KDiskSystem methods, now.
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synchronous scanning is supported.
* Removed the disk device job support from the disk device manager.
* K{Disk,File,Partitioning}System:
- Remove querying and validation methods.
- Commented out the modification methods until their fate is decided.
* Removed obsolete _user_get_partitionable_spaces().
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(_kern_{supports,validate}_*(), etc.).
* Adjusted the prototypes of the disk device modification syscalls.
Commented out their implementations for the time -- they'll mostly
have to be rewritten completely.
* Implemented the userland disk device jobs.
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sequential access.
* This is now used to let the cache free some pages (or schedule them to be
written back) before vm_reserve_pages() is called, but only if that cache
is not mapped, and there is a memory shortage.
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for this reason, we don't add such a node in the list of nodes to be scanned
this fixes the bug #1578
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68030 invalidates only 1 long of a cache line each time.
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The low memory handler now has two passes which should help there; however, it
might also accidently remove recently used vnodes, too. We could mark the clean
ones in some way if that turns out to be a problem.
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status checker now only tries to lock the manager, it won't wait anymore.
* Added MediaChanged() and UpdateMediaStatusIfNeeded() methods to KDiskDevice.
* KDiskDeviceManager::_CheckMediaStatus() now uses these new methods; it should
no longer detect removed media more than once :-)
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and van Flandern (1968), instead of those inefficient loops we had before.
Thanks!
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not work; it would always choose the last thread of the current priority.
IOW a thread was never skipped, and lower priority threads were never called
when a higher priority thread was running - from the POV of the scheduler,
we only has real time threads...
* Improved "run_queue" KDL output.
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22515 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Removed old port test code, it doesn't belong there.
* Cleanup.
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vm_page_reserve_pages() and vm_page_allocate_page() will now steal pages from
the inactive queue as needed.
* We currently never steal active pages anymore, but this might need to be
revised later (therefore, the page scanner never waits anymore, but uses
mutex_trylock() to lock a cache).
* The page scanner and writer now both run at normal priority - let's see how
that will work out.
* Introduced an inactive queue.
* Instead of shuffling pages around in the queue (and therefore destroying LRU)
the page stealing mechanism now uses a marker page to be able to release the
page lock without losing its position in the queue.
* The page writer now always grabs the whole release count of the semaphore, so
that there won't be a huge backlog to catch up with.
* vm_page_num_free_pages() now also includes the inactive queue as well as the
reserved pages (they are no longer regarded as free pages).
* Added a insert_page_after() function that inserts a page after another one,
needed by the marker code.
* clear_page() now gets a vm_page instead of a physical address which simplified
some code.
* Removed superfluous initialization of the queues (if those aren't zeroed on
start, we would have serious problems, anyway).
* Removed old and unimplemented dump_free_page_table() ("free_pages") KDL
command.
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* Fixed warnings with debug output turned on.
* Shuffled functions around a bit.
* Minor cleanup.
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vm_remove_all_page_mappings() all computed the wrong virtual address for the
page in question, and would therefore return incorrect data!
Introduced a virtual_page_address() function that is now used by all of them.
So that's why we were still "losing" modified flags - it took me some hours
to find those (sometimes processes died after stealing pages)...
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22498 a95241bf-73f2-0310-859d-f6bbb57e9c96
it intended to. That resulted in more writable pages where you wouldn't want
them (ie. allowing the area to change pages in lower caches).
* We were losing modified pages: vm_unmap_pages() sometimes has to preserve
the modified flag (eg. when called from page fault).
* Both of these were responsible that stealing active pages would crash
applications - even if less likely, this could also have happened when
stealing inactive pages. Therefore, I've activated stealing active pages
again.
* The page writer now pushes the pages of busy vnodes to the end of the queue,
so that it won't pick them up again too soon (the vnode destruction would
be in the process of writing those pages back, anyway).
* The page thief now triggers the page writer to run once it has to steal
active pages. This might be a bit too aggressive, though.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22495 a95241bf-73f2-0310-859d-f6bbb57e9c96
pages to reserve, which could result in to few being reserved in certain
situations.
* Use MutexLocker where appropriate.
* Reordered includes following the new rules.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22494 a95241bf-73f2-0310-859d-f6bbb57e9c96
the blue screen was initialized - blue_screen_enter() now returns wether
or not it has been initialized already (there will only be serial output
in that case).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22491 a95241bf-73f2-0310-859d-f6bbb57e9c96
* The page_thief() will no longer steal any pages in B_LOW_MEMORY_NOTE state,
only in the more serious cases.
* I've disabled stealing active pages for now again; there seem to be some
problems with it (either with how we do it, or with other stuff).
* vm_page_schedule_write_page() now always releases the page writer semaphore,
resulting in many more written pages - this isn't optimal as long as there is
no I/O scheduler, but before it was much too rare when there are many dirty
pages.
* Customized the thread priorities a bit to make the page scanner/thief/writer
experience a bit nicer with our current scheduler.
* vm_page_reserve_pages() would return too early, it did not test if really
enough pages are free.
* Under certain circumstances, the wakeup from vm_page_reserve_pages() did not
work - we now always notify in vm_page_unreserve_pages() to work around that
problem.
* Checked if the page reservations are done when needed and are always balanced
for the whole kernel.
* vm_page_allocate_page() now panics if it can't deliver a reserved page.
* vm_page_allocate_page_run() can no longer steal reserved pages.
* With all of those changes, I could finally copy a file in emulation, ie. the
Luposian bug should finally be fixed, even though the system might still not
be perfectly stable under low memory. Will do some more testing.
* write_page() no longer prints something on failure.
* Dumping a whole page queue will now also write the cache type of each page.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22486 a95241bf-73f2-0310-859d-f6bbb57e9c96
busy vnodes.
* dir_create_entry_ref() used get_vnode() incorrectly (and could therefore
potentially prevent a file system from doing proper locking when called
from the kernel).
* The vnode_store now uses this for its acquire_unreferenced_ref()
implementation (and therefore for the page writer).
* read_into_cache() and write_to_cache() were still marked inline.
* The system will now wait 10 secs for a busy vnode before returning an error.
* It will also no longer panic in that case.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22485 a95241bf-73f2-0310-859d-f6bbb57e9c96
* vm_low_memory_state() now periodically recomputes the state in case the
low memory thread is waiting for something.
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