in the free and/or clear queue. This performs better in the case where only few
pages are free/clear but performs worse in the case where there are a lot of
usable pages. It's not used anywhere but it might come in handy one time.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33527 a95241bf-73f2-0310-859d-f6bbb57e9c96
PageWriteTransfer. This makes the transfer accept virtually contiguous pages,
where the offset is contiguous on either end of the current transfer, but where
the pages aren't physically contiguous. It will then add seperate iovecs for
these pages (32 at max right now). This reduces the number of IO requests
generated and allows for optimizations down the IO path (like in the physical to
virtual mapping case for example).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33526 a95241bf-73f2-0310-859d-f6bbb57e9c96
need for the IO -> InternalIO indirection as it is always fed virtual buffers,
which simplifies things a bit.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33525 a95241bf-73f2-0310-859d-f6bbb57e9c96
is virtual already it just returns the vecs directly, if it is physical it takes
over the task of virtualizing the vecs either using vm_map_physical_memory_vecs,
if there are multiple vecs or more than one page, or falls back to page wise
mapping if mapping fails or is not needed. In the best case, scattered physical
pages are mapped into one linear virtual buffer so that subsystems operating on
virtual memory only get a single vector and can then burst read/write.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33524 a95241bf-73f2-0310-859d-f6bbb57e9c96
takes a list of iovecs describing the physical pages to be mapped. With it one
can map a set of physically disjoint pages into one linear virtual range. This
is a private API right now, but we might want to make it public as
map_physical_memory_vecs alongside map_physical_memory.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33523 a95241bf-73f2-0310-859d-f6bbb57e9c96
are required to be physically contiguos, which should be reworked to put them
into seperate iovecs. Still this manages to combine a great deal of page
writes into larger bursts already. Reduces the amount of IO requests being
scheduled (and greatly benefits media where page wise writes are slow when
they are accessed through a non-IOScheduler path, i.e. USB mass storage until
that is properly implemented).
* Abstracted per page page writing tasks into a PageWriteWrapper class.
* Abstracted per transfer page writing tasks into PageWriteTransfer class which
formerly was the PageWriterCallback.
* Use both classes from the PageWriterRun and from
vm_page_write_modified_page_range to remove code duplication.
* Adjusted synchronous VMAnonymousCache::Write() to cope correctly with larger
iovecs and more than one iovec. It assumed that there was exactly one page per
vector previously.
* Introduced MaxPagesPerWrite() and MaxPagesPerAsyncWrite() to VMCache to allow
a cache to specify restricitions. VMAnonymousCache does restrict the max pages
to 1 for WriteAsync right now as I didn't feel like reworking that one to cope
with non single page writes just yet.
* Pulled out PageWriteTransfer methods for better readability.
* Some typo fixes.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33507 a95241bf-73f2-0310-859d-f6bbb57e9c96
reads or writes for old style drivers, map the physical memory at once. Since
USB is pretty much the only one affected and there small reads/writes are
exponentially slower, the performance gain of the burst transfer far outweighs
the additional overhead of the mapping. Still this could be further optimized
and will eventually be superseeded by also providing a physical memory API in
USB. For now it should bring back USB reads to an acceptable level. Writes are
still page wise though because of how writing back memory works in general.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33503 a95241bf-73f2-0310-859d-f6bbb57e9c96
always return the source string length, we can't really prevent an overflow
of the source address.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33489 a95241bf-73f2-0310-859d-f6bbb57e9c96
when scanning for drivers, as that reverts the standard locking order with
locks like the device manager lock. There is now a dedicated scan_lock for
each directory.
* get_device_name() now locks itself which also adds a missing lock in the
B_GET_PATH_FOR_DEVICE ioctl().
* Minor refactoring; the directory init code was duplicated over several places
in the source file.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33465 a95241bf-73f2-0310-859d-f6bbb57e9c96
address overflows. Apparently at least the x86 string instructions generate
a general protection fault instead of a page fault, and we only use the fault
handler in the latter case (maybe we should change that, too). Fixes#4714.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33436 a95241bf-73f2-0310-859d-f6bbb57e9c96
code is no longer loaded, e.g. when the module has been unloaded or the tracing
buffer was reattached from a previous session.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33389 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Added new header headers/private/system/disk_device_types.h, which defines
the <DiskDeviceTypes.h> constants as macros and which can be used where the
constants cannot be used. The constants are defined using the macros, so now
there's only one place where the string literals should be specified.
* Use the macros in the partitioning systems. I was too lazy to also adjust the
file systems -- most of them seem to hard-code the string literal yet.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33386 a95241bf-73f2-0310-859d-f6bbb57e9c96
- Fixed vfs_get_vnode_from_fd() return type.
- Added vfs_open_vnode().
- Added a "bool traverseLeafLink" parameter to vfs_get_fs_node_from_path().
It was always resolving symlinks.
* device manager/devfs:
- devfs: get_node_for_path() no longer resolves leaf symlinks. That still
doesn't help with file disk devices, as creating partition wouldn't work
anyway.
- Pulled the module-related implementation part of BaseDevice into new class
AbstractModuleDevice and made all methods of BaseDevice virtual. Small
adjustments to devfs to be happy with the new BaseDevice interface.
- Added BaseDevice subclass FileDevice, which maps the interface to a file's
file descriptor. Still got a few TODOs, but should basically work.
- Use FileDevice for publishing file disk devices in devfs. Now those do
actually work, though there's some BFS trouble with one of the images I
tested.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33385 a95241bf-73f2-0310-859d-f6bbb57e9c96
aren't routed correctly over the 8259, it seems.
- Removed passing the hpet_regs around, since there's a static variable.
- Added lots of debug dprintfs.
- Fixed setting the timer interrupt to edge
- Timer is initialized once.
- Use the timer 0 instead of 2.
- Renamed register definitions to be more readable
- Use 64 bits registers and unions where applicable.
- Other things I don't remember
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33345 a95241bf-73f2-0310-859d-f6bbb57e9c96
Also shortened some defines using "TN" instead of "TIMER". It's also
the same scheme used in the specs
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33334 a95241bf-73f2-0310-859d-f6bbb57e9c96
Lowered its priority of hpet timer so it doesn't get picked up first
(yet)
Changed the debug output to be conditional.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33292 a95241bf-73f2-0310-859d-f6bbb57e9c96
factor to avoid compiler issues.
- Removed some useless and commented debug stuff.
- Now prints also the global HPET configuration.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33291 a95241bf-73f2-0310-859d-f6bbb57e9c96
1000. XenServer boots correctly and in reasonable time,
now (meaning hpet timers work). I guess on real hw the bios doesn't
correctly program the hpet timers, so we'll need a bit more work.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33289 a95241bf-73f2-0310-859d-f6bbb57e9c96
XenServer actually boots (but slow as hell) with hpet timers enabled, real hardware does
not.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33287 a95241bf-73f2-0310-859d-f6bbb57e9c96
if they were not already ordered. Or, to say id differently, it was completely
broken.
Luckily no one noticed....
Also disabled again printing the timers, since it could print not available ones.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33235 a95241bf-73f2-0310-859d-f6bbb57e9c96
checked the existence of the apics.
Moved the code to disable the local apic from arch_timer.c to arch_int.cpp, so
we also avoid installing the interrupt handler for it.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33149 a95241bf-73f2-0310-859d-f6bbb57e9c96
can cause overflows.
* Added a generic IS_VALID_SPOT() macro that checks for overflows and checks if
the area will fit with the given constraints.
* Use the macro to simplify the places where these checks are necessary.
* Use the provided "end" limit instead of the address space end. It currently
doesn't matter but makes more sense.
* Rename newBase variables to alignedBase as that's what they are.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33061 a95241bf-73f2-0310-859d-f6bbb57e9c96
to insert areas so we don't overflow.
* Consequently use the area end (base + size - 1) where appropriate which
prevents overflows in a few places.
* Properly check for reaching the address space end.
* If we've already found a spot we don't need to recheck if we've found one.
* Simplify the B_EXACT_ADDRESS checks down to a simpler single if statement
instead of the four seperate ones.
* Properly calculate the search end for B_EXACT_ADDRESS as well, it's also
base + size - 1.
* Block the full last page now that this actually works without overflowing.
* Some style changes and added spacing.
This should now really fix#2550. Previously the overflow protection didn't
actually work because on allocation we overflowed and completely missed the
protecting area.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33037 a95241bf-73f2-0310-859d-f6bbb57e9c96
and 0xcccccccc (and 64 pages thereafter) in any way will always lead to a crash.
Before it could happen that these ranges were allocated for an area and then
accessing these would not be as evident anymore. Only enabled when the
corresponding paranoid setting is enabled (which it currently is).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33033 a95241bf-73f2-0310-859d-f6bbb57e9c96
of the VM functions handling areas are overflow safe. If an area is created that
spans across the last page many places will run into an integer overflow. This
mostly concerns the area allocation path in find_and_insert_area_slot() and also
vm_create_anonymous_area() where the loop for mapping pages for B_FULL_LOCK
areas overflows and runs more times than it should leading to #2550.
This could be seen as a workaround. The real fix would be to make everything
overflow safe. The thing is that this does also concern the user of the area
which could easily have forgotten to check for overflows as well, so I am a bit
uneasy with handing out areas that could easily lead to such hard to debug
problems. Since this is really an edge case and this single step safes quite a
bit of extra checks I'd actually be OK with keeping it that way.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33032 a95241bf-73f2-0310-859d-f6bbb57e9c96
mapped pages and a non-read and non-write protection to block a certain address
range from being used by anything.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33030 a95241bf-73f2-0310-859d-f6bbb57e9c96
end up as 0 again in any case. It certainly looks correct without it, removing
so it doesn't confuse the next one reading over it.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32994 a95241bf-73f2-0310-859d-f6bbb57e9c96
many pages as are actually missing, not the full count.
* Take into account that free_page_queue_count() can be less than sReservedPages
(when some of the reserved pages have been allocated already) in
vm_page_num_unused_pages(). Before it could return negative and therefore
wrapped numbers.
* Simplify the page scrubber loop by continuing early. Also avoids a needless
interrupt spin lock acquisition when there's nothing to do.
* Some minor coding style cleanup.
* Fix a typo.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32980 a95241bf-73f2-0310-859d-f6bbb57e9c96
allows for BFS based LiveCDs. Still this whole name matching feels hacky.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32976 a95241bf-73f2-0310-859d-f6bbb57e9c96
This allows for synchronous uses where subrequests are forked off and waited on.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32936 a95241bf-73f2-0310-859d-f6bbb57e9c96
only some sub requests worked. Previously we would have simply canceled all
of the subrequests in the loop because we cancel after the first error.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32914 a95241bf-73f2-0310-859d-f6bbb57e9c96
* An off by one error prevented the very last block of a device to be accessed
through IO.
* In case of error the request wasn't notified causing anyone (the page writer
for example) to wait forever for the request to complete.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32913 a95241bf-73f2-0310-859d-f6bbb57e9c96
for the page list but not the area one. Since multiple pages can be allocated
at once, even an area that is not at the top of the list can become empty. In
such a case the area list would previously have lost entries. Also because
we can remove more than one page from any area, not just the top one, we may
need to move forward in the list so that it stays ordered by free pages.
+alphabranch
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32880 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Got rid of <dirent_private.h> -- the __DIR structure is private to dirent.c,
now. The attribute directory, index directory, and query functions use the
the public POSIX API, so does the kernel module code. Those components were
not initializing the structure correctly anymore since the introduction of
telldir()/seekdir().
+alphabranch
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32819 a95241bf-73f2-0310-859d-f6bbb57e9c96
to " &" as really the whole rest of the file uses that style.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32813 a95241bf-73f2-0310-859d-f6bbb57e9c96
switch /boot to a different volume in two operations, unless you have first
linked /system/lib into /bin. This patch assumes that / will always have the
ID 1. Don't know if that is proper. Note that I also thought about solving
this in the VFS, since perhaps it isn't the job of root-fs to know about
/boot, but that would of course introduce another check for every rename
operation, which I decided against.
+alphabranch
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32806 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Moved device_manager/settings.cpp to debug/safemode_settings.cpp.
* Removed the somewhat hacky concatenation of kernel settings and safemode
settings in the boot loader. Instead, get_safemode_option() will now fall
back to the kernel settings, if it couldn't spot a setting in the safemode
settings. This allows for more control, and also makes enabling serial
debug output actually work (ie. overriding the kernel settings via safemode
options).
* Adjusted debug_init_post_vm(), and smp_init_other_cpus() to use
get_safemode_boolean().
* Therefore, I added safemode_settings.cpp to the boot loader as well.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32685 a95241bf-73f2-0310-859d-f6bbb57e9c96
into the scope of the lock. Saves an InterruptsSpinLocker.
* Use an InterruptsSpinLocker() as in other places.
* When creating/forking a team fails because the kernel thread cannot be spawned
balance the already sent TEAM_ADDED notification by sending a TEAM_REMOVED one.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32595 a95241bf-73f2-0310-859d-f6bbb57e9c96
been removed. That includes CPU disabling and thread pinning, as that becomes
pointless with only one CPU.
* Return a proper reschedule hint on enqueing a thread, based on the priority
of the current thread vs. the enqueued one.
* Enable dynamic scheduler selection. With one CPU the simple scheduler will
be used, otherwise affine is selected.
* Removed the scheduler type define as we now always auto-select it.
* Some cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32573 a95241bf-73f2-0310-859d-f6bbb57e9c96
* scheduler_enqueue_in_runqueue() now allows the scheduler to return a hint as to whether a reschedule is desirable or not. This is used in a few other places in order to relegate scheduling decisions entirely to the scheduler rather than the priority hacks previously used. There are probably other places in the kernel that could now make use of that information to more intelligently call reschedule() though.
* Switch over the default scheduler to scheduler_affine().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32554 a95241bf-73f2-0310-859d-f6bbb57e9c96
you can easily produce a dead lock. This should fix the system hang
experienced as part of bug #4223.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32526 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Keep track of the currently running threads.
* Make use of that info to decide if a thread that becomes ready should preempt
the running thread.
* If we should preempt we send the target CPU a reschedule message.
* This preemption strategy makes keeping track of idle CPUs by means of a bitmap
superflous and it is therefore removed.
* Right now only other CPUs are preempted though, not the current one.
* Add missing initialization of the quantum tracking code.
* Do not extend the quantum of the idle thread based quantum tracking as we want
it to not run longer than necessary. Once the preemption works completely
adding a quantum timer for the idle thread will become unnecessary though.
* Fix thread stealing code, it did missed the last thread in the run queue.
* When stealing, try to steal the highest priority thread that is currently
waiting by taking priorities into account when finding the target run queue.
* Simplify stealing code a bit as well.
* Minor cleanups.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32503 a95241bf-73f2-0310-859d-f6bbb57e9c96
re-insert it at a new place, but by only setting the priority and not the
next_priority field, the thread would actually be enqueued at the same priority
level as before. Didn't cause any real damage, guess it was just an oversight.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32494 a95241bf-73f2-0310-859d-f6bbb57e9c96
not hold the bin lock while setting and only protect the actual freeing. May
reduce bin lock contention a little bit.
* Tiny optimization for force-clearing 0xdeadbeef. Do it after setting to 0xcc,
so that it's less likely we have to do it.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32473 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Always select POLLNVAL. We wouldn't get notified, if the FD was closed while
waiting.
* Skip negative FDs (as per POSIX standard).
* When encountering an invalid FD, we must not wait. Previously we did that as
long as any FD was valid.
* The return count must consider all FDs with non-null revents, including
invalid ones (revents is POLLNVAL then).
common_poll()/common_wait_for_objects():
* Don't bail out early, when no FDs/objects have been selected. We always want
to wait.
_user_poll()/_user_wait_for_objects():
* Copy the array back to userland even if common_*() returned an error. The
functions do now always fill in the resulting events.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32418 a95241bf-73f2-0310-859d-f6bbb57e9c96
* B_EVENT_INVALID is no longer passed to the FD's select()/deselect() hooks.
* Now we always attach the select info to the I/O context, even if no event has
been selected. The reasoning is that B_EVENT_INVALID is always automatically
selected and handled by the VFS, so we need the handle to notify on close().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32417 a95241bf-73f2-0310-859d-f6bbb57e9c96
