going on. I only wanted to have it in the repository in case we decide at a
later point that it is a good idea after all.
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its own source file now that the page daemon source file is gone.
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* Added vm_clear_page_mapping_accessed_flags() and
vm_remove_all_page_mappings_if_unaccessed(), which combine the functionality
of vm_test_map_activation(), vm_clear_map_flags(), and
vm_remove_all_page_mappings(), thus saving lots of calls to translation map
methods. The backend is the new method
VMTranslationMap::ClearAccessedAndModified().
* Started to make use of the cached page queue and changed the meaning of the
other non-free queues slightly:
- Active queue: Contains mapped pages that have been used recently.
- Inactive queue: Contains mapped pages that have not been used recently. Also
contains unmapped temporary pages.
- Modified queue: Contains unmapped modified pages.
- Cached queue: Contains unmapped unmodified pages (LRU sorted).
Unless we're actually low on memory and actively do paging, modified and
cached queues only contain non-temporary pages. Cached pages are considered
quasi free. They still belong to a cache, but since they are unmodified and
unmapped, they can be freed immediately. And this is what
vm_page_[try_]reserve_pages() do now when there are no more actually free
pages at hand. Essentially this means that pages storing cached file data,
unless mmap()ped, no longer are considered used and don't contribute to page
pressure. Paging will not happen as long there are enough free + cached pages
available.
* Reimplemented the page daemon. It no longer scans all pages, but instead works
the page queues. As long as the free pages situation is harmless, it only
iterates through the active queue and deactivates pages that have not been
used recently. When paging occurs it additionally scans the inactive queue and
frees pages that have not been used recently.
* Changed the page reservation/allocation interface:
vm_page_[try_]reserve_pages(), vm_page_unreserve_pages(), and
vm_page_allocate_page() now take a vm_page_reservation structure pointer.
The reservation functions initialize the structure -- currently consisting
only of a count member for the number of still reserved pages.
vm_page_allocate_page() decrements the count and vm_page_unreserve_pages()
unreserves the remaining pages (if any). Advantages are that reservation/
unreservation mismatches cannot occur anymore, that vm_page_allocate_page()
can verify that the caller has indeed a reserved page left, and that there's
no unnecessary pressure on the free page pool anymore. The only disadvantage
is that the vm_page_reservation object needs to be passed around a bit.
* Reworked the page reservation implementation:
- Got rid of sSystemReservedPages and sPageDeficit. Instead
sUnreservedFreePages now actually contains the number of free pages that
have not yet been reserved (it cannot become negative anymore) and the new
sUnsatisfiedPageReservations contains the number of pages that are still
needed for reservation.
- Threads waiting for reservations do now add themselves to a waiter queue,
which is ordered by descending priority (VM priority and thread priority).
High priority waiters are served first when pages become available.
Fixes#5328.
* cache_prefetch_vnode(): Would reserve one less page than allocated later, if
the size wasn't page aligned.
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that does not have a transaction.
* This should fix#5340.
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releasing our reference to it. So return immediately after having done that.
Previously the _MaybeNotifyProfilerThread() that innocently lurked at the end
of the method would be invoked, playing with the dead beef.
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general "flags" parameter. It encodes the target state of the page -- so
that the page isn't unnecessarily put in the wrong page queue first -- a
flag whether the page should be cleared, and one to indicate whether the
page should be marked busy.
* Added page state PAGE_STATE_CACHED. Not used yet.
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flag. The obvious advantage is that one can still see what state a page is in
and even move it between states while being marked busy.
* Removed the vm_page::is_dummy flag. Instead we mark marker pages busy, which
in all cases has the same effect. Introduced a vm_page_is_dummy() that can
still check whether a given page is a dummy page.
* vm_page_unreserve_pages(): Before adding to the system reserve make sure
sUnreservedFreePages is non-negative. Otherwise we'd make nonexisting pages
available for allocation. steal_pages() still has the same problem and it
can't be solved that easily.
* map_page(): No longer changes the page state/mark the page unbusy. That's the
caller's responsibility.
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the wired count of manually mapped pages not to be decremented in
delete_area(), leading to a "pages still has mappings" panic when the slab
allocator's memory manager deleted areas.
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* Added flags to avoid notifying the busy condition variable unnecessarily.
* get_writable_cached_block(): Unlock the cache while memcpy()ing/memset()ing
the block's data. The idea is to reduce lock contention. Less effective
than I hoped, though.
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functional change (other than avoiding no-ops like subtracting 0).
* vm_page_try_reserve_pages(): Moved the kernel tracing calls from the top of
the function to the points where the reservation already succeeded.
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argument. They replace the previous special-purpose allocation functions
(malloc_nogrow(), vip_io_request_malloc()).
* Moved the I/O VIP heap to heap.cpp accordingly.
* Added quite a bit of passing around of allocation flags in the VM,
particularly in the VM*AddressSpace classes.
* Fixed IOBuffer::GetNextVirtualVec(): It was ignoring the VIP flag and always
allocated on the normal heap.
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on the fly, clearing and writing it each time, we now use an iovec with 32
identical entries pointing to a clear page that we prepare once at
initialization. This speeds up clear_image in low memory situations
dramatically.
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beginning whether to pass the cache by really doesn't help when
reading/writing a huge amount of data, since a low memory situation is likely
to occur at some point during the operation. This should fix the main issue
of #3768.
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memory and page reservation functions have a new "priority" parameter that
indicates how deep the function may tap into that reserve. The currently
existing priority levels are "user", "system", and "VIP". The idea is that
user programs should never be able to cause a state that gets the kernel into
trouble due to heavy battling for memory. The "VIP" level (not really used
yet) is intended for allocations that are required to free memory eventually
(in the page writer). More levels are thinkable in the future, like "user real
time" or "user system server".
* Added "priority" parameters to several VMCache methods.
* Replaced the map_backing_store() "unmapAddressRange" parameter by a "flags"
parameter.
* Added area creation flag CREATE_AREA_PRIORITY_VIP and slab allocator flag
CACHE_PRIORITY_VIP indicating the importance of the request.
* Changed most code to pass the right priorities/flags.
These changes already significantly improve the behavior in low memory
situations. I've tested a bit with 64 MB (virtual) RAM and, while not
particularly fast and responsive, the system remains at least usable under high
memory pressure.
As a side effect the slab allocator can now be used as general memory allocator.
Not done by default yet, though.
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Those use malloc(), which obviously doesn't work before the heap is
initialized.
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table, we only enter the slab. This also saves us the link object per object.
* Removed the now useless {Prepare,Unprepare}Object() methods.
* SmallObjectCache: Unlock the cache while calling into the MemoryManager. We
need to do that to avoid an indirect violation of the CACHE_DONT_* policy.
* Simplified lower_boundary().
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* Added support to do larger raw allocations (up to one large chunk (128 pages))
in the slab areas. For an even larger allocation an area is created (haven't
seen that happen yet, though).
* Added kernel tracing (SLAB_MEMORY_MANAGER_TRACING).
* _FreeArea(): Copy and paste bug: The meta chunks of the to be freed area
would be added to the free lists instead of being removed from them. This
would corrupt the lists and also lead to all kinds of misuse of meta chunks.
object caches:
* Implemented CACHE_ALIGN_ON_SIZE. It is no longer set for all small object
caches, but the block allocator sets it on all power of two size caches.
* object_cache_reserve_internal(): Detect recursion and don't wait in such a
case. The function could deadlock itself, since
HashedObjectCache::CreateSlab() does allocate memory, thus potentially
reentering.
* object_cache_low_memory():
- I missed some returns when reworking that one in r35254, so the function
might stop early and also leave the cache in maintenance mode, which would
cause it to be ignored by object cache resizer and low memory handler from
that point on.
- Since ReturnSlab() potentially unlocks, the conditions weren't quite correct
and too many slabs could be freed.
- Simplified things a bit.
* object_cache_alloc(): Since object_cache_reserve_internal() does potentially
unlock the cache, the situation might have changed and their might not be an
empty slab available, but a partial one. The function would crash.
* Renamed the object cache tracing variable to SLAB_OBJECT_CACHE_TRACING.
* Renamed debugger command "cache_info" to "slab_cache" to avoid confusion with
the VMCache commands.
* ObjectCache::usage was not maintained anymore since I introduced the
MemoryManager. object_cache_get_usage() would thus always return 0 and the
block cache would not be considered cached memory. This was only of
informational relevance, though.
slab allocator misc.:
* Disable the object depots of block allocator caches for object sizes > 2 KB.
Allocations of those sizes aren't so common that the object depots yield any
benefit.
* The slab allocator is now fully self-sufficient. It allocates its bootstrap
memory from the MemoryManager, and the hash tables for HashedObjectCaches use
the block allocator instead of the heap, now.
* Added option to use the slab allocator for malloc() and friends
(USE_SLAB_ALLOCATOR_FOR_MALLOC). Currently disabled. Works in principle and
has virtually no lock contention. Handling for low memory situations is yet
missing, though.
* Improved the output of some debugger commands.
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VMCacheRef object, since that can fail, in which case the subsequently called
Delete() would use uninitialized pointers.
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to add it back to its partial list or it would be leaked.
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* Does now keep one or two empty areas around, so that even in case of
CACHE_DONT_LOCK_KERNEL_SPACE memory can be provided as long as pages are
available. The object cache maintainer thread is used to asynchronously
allocate/delete the free areas.
* Added new debugger commands "slab_meta_chunk[s]" and improved the existing
ones.
* Moved Area::chunks to MetaChunk.
* Removed unused _AllocationArea() "chunkSize" parameter.
* Fixed serious bug in _FreeChunk(): Empty meta chunks were not removed from
the partial chunk lists and could thus be used twice.
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adding the cache to the maintenance queue. Not so important but more correct.
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low resource handler functions. Particularly fixed the race conditions
between those and delete_object_cache().
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a certain chunk size, the areas are split into meta chunks (which are as
large as a large chunk) each of which can be a used independently for chunks
of a certain size. This reduces the vulnerablity to fragmentation, so that we
need fewer areas overall.
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CACHE_DONT_LOCK_KERNEL_SPACE. If the former is given, the slab memory manager
does not wait when reserving memory or pages. The latter prevents area
operations. The new flags add a bit of flexibility. E.g. when allocating page
mapping objects for userland areas CACHE_DONT_WAIT_FOR_MEMORY is sufficient,
i.e. the allocation will succeed as long as pages are available.
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allocate a page mapping. In that case we do at least have to mark the page
not busy again. Furthermore we enforce the minimum page mappings object cache
reserve, so we'll have more luck on the next fault.
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* Implemented a more elaborated raw memory allocation backend (MemoryManager).
We allocate 8 MB areas whose pages we allocate and map when needed. An area is
divided into equally-sized chunks which form the basic units of allocation. We
have areas with three possible chunk sizes (small, medium, large), which is
basically what the ObjectCache implementations were using anyway.
* Added "uint32 flags" parameter to several of the slab allocator's object
cache and object depot functions. E.g. object_depot_store() potentially wants
to allocate memory for a magazine. But also in pure freeing functions it
might eventually become useful to have those flags, since they could end up
deleting an area, which might not be allowable in all situations. We should
introduce specific flags to indicate that.
* Reworked the block allocator. Since the MemoryManager allocates block-aligned
areas, maintains a hash table for lookup, and maps chunks to object caches,
we can quickly find out which object cache a to be freed allocation belongs
to and thus don't need the boundary tags anymore.
* Reworked the slab boot strap process. We allocate from the initial area only
when really necessary, i.e. when the object cache for the respective
allocation size has not been created yet. A single page is thus sufficient.
other:
* vm_allocate_early(): Added boolean "blockAlign" parameter. If true, the
semantics is the same as for B_ANY_KERNEL_BLOCK_ADDRESS.
* Use an object cache for page mappings. This significantly reduces the
contention on the heap bin locks.
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the CACHE_DONT_SLEEP flag to work for real, since otherwise the thread could
block on the mutex held by a thread allocating memory. We use two condition
variables to prevent multiple threads from allocating slabs at the same time.
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* Changed the semantics of object_cache_reserve_internal(). Now it makes sure
the given number of objects are free. As a side effect this also changes
the semantics of object_cache_reserve() similarly, though I have trouble
seeing the purpose of the function in the first place.
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one for each per CPU store):
* The depot is now protected by a R/W lock combined with a spinlock. It is
required to either hold read lock + spinlock or just the write lock.
* When accessing the per CPU stores we only need to acquire the read lock
and disable interrupts. When switching magazines with the depot we
additionally get the spinlock.
* When allocating a new magazine we do completely unlock.
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* The threads beside the main thread are killed earlier now (in the new
team_shutdown_team()), before removing the team from the team hash and from
its process group. This fixes#5296.
* Use a condition variable instead of a semaphore to wait for the non-main
threads to die. We notify the condition right after a thread has left the
team. The semaphore was released by the undertaker.
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function is used only in one place and the missing locking would be harmless
if it weren't for the per translation map physical page mapper. It is used to
map the page table for the lookup. Concurrent access could corrupt its data
structures, or, just as bad, the unlocked Query() could remap the page table
used by a concurrent Map() or Unmap(), which would then manipulate the
wrong page table.
Potentially messing up kernel memory, this bug could obviously cause all
kinds of kernel crashes and weird behavior. E.g. ticket #5138 is a likely
candidate, as are triple faults.
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idea, since that would potentially add the object back to the object store
or lead to infinite recursion. When the object cache is destroyed it most
likely led to infinite loops, because the object would alternately be
removed from and added back to the object store.
* delete_object_cache(): Lock after destroying the object store, so we don't
deadlock.
* Use the object store on SMP machines. It seems to work, though I only
tested with the network stack and that seems to have problems of its own.
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* heap_index_for(): Could return invalid index, if there hadn't been created
a set of heaps for each CPU.
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things a bit.
* Some style cleanup.
* The object depot does now have a cookie that will be passed to the return
hook.
* Fixed object_cache_return_object_wrapper() using the new cookie.
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When initializing driver settings, make sure to set the parameter count to 0,
because these settings have not been parsed yet. This allows us to safely free
the settings. Freeing the settings is triggered in load_driver_settings() if
we encounter settings which have been originally loaded by the boot_loader,
which might be stale. I think the bug would trigger for settings which had been
loaded by the boot_loader but had never been parsed.
With this change, I can use the userlandfs on all my machines.
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VMCacheRef object which points to the cache. This allows to optimize
VMCache::MoveAllPages(), since it no longer needs to iterate over all pages
to adjust their cache pointer. It can simple swap the cache refs of the two
caches instead.
Reduces the total -j8 Haiku image build time only marginally. The kernel time
drops almost 10%, though.
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* Added "bool consumerLocked" parameter to VMCache::Unlock() and
ReleaseRefAndUnlock(). Since Unlock() may cause the cache to be merged with
a consumer cache, the flag is needed to prevent a deadlock in case the
caller still holds a lock to the consumer. Hasn't been a problem yet, since
that situation never occurred.
* VMCacheChainLocker: Reversed unlocking order to bottom-up. The other
direction could cause a deadlock in case caches would be merged, since the
locking order would be reversed. The way VMCacheChainLocker was used this
didn't happen, though.
* fault_get_page(): While copying a page from a lower cache to the top cache,
we do now unlock all caches but the top one, so we don't unnecessarily
kill concurrency.
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Also added an empty stub for _thread_do_exit_notification() when compiling for GCC2.
* Removed the check testing if the thread is already dead.
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* Moved the "tmp" directory out of /var, and to /boot/common/cache/.
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* Implementations of pthread_getschedparam and pthread_setschedparam I had since a while.
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Update filesystem name in find_directory as our fat filesystem is not named "dos".
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* Reorganized the code for [un]mapping pages:
- Added new VMTranslationMap::Unmap{Area,Page[s]}() which essentially do what
vm_unmap_page[s]() did before, just in the architecture specific code, which
allows for specific optimizations. UnmapArea() is for the special case that
the complete area is unmapped. Particularly in case the address space is
deleted, some work can be saved. Several TODOs could be slain.
- Since they are only used within vm.cpp vm_map_page() and vm_unmap_page[s]()
are now static and have lost their prefix (and the "preserveModified"
parameter).
* Added VMTranslationMap::Protect{Page,Area}(). They are just inline wrappers
for Protect().
* X86VMTranslationMap::Protect(): Make sure not to accidentally clear the
accessed/dirty flags.
* X86VMTranslationMap::Unmap()/Protect(): Make page table skipping actually
work. It was only skipping to the next page.
* Adjusted the PPC code to at least compile.
No measurable effect for the -j8 Haiku image build time, though the kernel time
drops minimally.
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* relocated Trash dirs to volume roots by modifying find_directory() to report the trash location as volume/Trash.
* FSUtils no longer creates /home/Desktop on every volume.
* TrashWatcher now keeps icons in sync on all volumes.
* Simplified FSGetDeskDir since it no longer has to worry about getting the desk directory on any volume other than the root.
* Relocated trash context menu logic to BContainerWindow so it can also be used at the volume roots.
* DesktopPoseView now creates a virtual Trash pose representing the trash contents as before.
* Corrected typo: Model::WriteAttrKillForegin() -> Model::WriteAttrKillForeign().
Closes ticket #5245.
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* Pulled the physical page mapping functions out of vm_translation_map into
a new interface VMPhysicalPageMapper.
* Renamed vm_translation_map to VMTranslationMap and made it a proper C++
class. The functions in the operations vector have become methods.
* Added class GenericVMPhysicalPageMapper implementing VMPhysicalPageMapper
as far as possible (without actually writing new code).
* Adjusted the x86 and the PPC specifics accordingly (untested for the
latter). For the other architectures the build is, I'm afraid, seriously
broken.
The next steps will modify and extend the VMTranslationMap interface, so that
it will be possible to fix the bugs in vm_unmap_page[s]() and employ
architecture specific optimizations.
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situations:
* When mapping the page the page table entry should not have been marked
"present" before, i.e. it would not have been cached anyway.
* When the page table entry's accessed flag wasn't set, the entry hadn't been
cached either.
Speeds up the -j8 Haiku image build only minimally, but the total kernel time
drops about 9%.
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* ioapic_init(): map_physical_memory() was called for already mapped
addresses. This worked fine, but only because the x86 page mapping code
didn't mind.
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* Removed the page_{table,directory}_entry structures. The bit fields are
nice in principle, but modifying individual flags this way is inherently
non-atomic and we need atomicity in some situations.
* Use atomic operations in protect_tmap(), clear_flags_tmap(), and others.
* Aligned the query_tmap_interrupt() semantics with that of query_tmap().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35058 a95241bf-73f2-0310-859d-f6bbb57e9c96
Entering the boot loader menu has changed/simplified while reducing the boot time by .75 seconds.
Now it is enough to hold one of shift/Esc/F8/F12/Space. Thanks!
I've also updated the boot loader documentation to reflect the change, but I only mentioned holding shift.
I know that changing the documention directly is not preferred anymore, but I wanted to make sure this
patch is complete.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35050 a95241bf-73f2-0310-859d-f6bbb57e9c96
preserve the dirty flag of the mapping without having to potentially move the
page to the modified queue. This lifts the (ignored) requirement that the
pages to be unmapped must not be busy.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35023 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Use atomic_{and,or}() instead of atomic_set(), as there are no built-ins
for the latter.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35021 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Fix the boot net stack's IPService to base the calculation payload size
on the IP-indicated packet size instead of the Ethernet payload.
Thanks a lot! Fixes ticket #5234.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35016 a95241bf-73f2-0310-859d-f6bbb57e9c96
This makes appending the pages to the active queue more efficient and we
don't need the vm_page::is_cleared bit anymore.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35011 a95241bf-73f2-0310-859d-f6bbb57e9c96
short and quite hot, so mutexes just cause more overhead due to frequent
rescheduling than waiting for the spinlocks does. The free and clear queues
are additionally protected by a R/W lock, which is mostly read-locked, save
for rare cases like allocating page runs.
The total -j8 Haiku image build speedup is marginal. The kernel time drops
about 8%, though.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35004 a95241bf-73f2-0310-859d-f6bbb57e9c96
that causes a locking order reversal (condition variable lock <-> system
profiler lock) and thus a potential deadlock. Instead we use the thread
blocking API directly. Fixes#5229.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35003 a95241bf-73f2-0310-859d-f6bbb57e9c96
We can only access the page, if it is not busy. Fixes#5228.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34980 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Various smaller fixes.
* Used add_debugger_command_etc() and added more verbose usage message.
* Added option "-m" which iterates through all address spaces and finds out
which virtual pages are mapped to the page.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34979 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Added Debug{First,Next}() methods to allow easy iteration through the
address spaces in kernel debugger commands.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34978 a95241bf-73f2-0310-859d-f6bbb57e9c96
device path + child partition name. When a "raw" device is unpublished the node
removal notification triggers the partition and child partitions to be
unpublished/removed. Since in that case the "raw" node is already unpublished
trying to resolve it in devfs_unpublish_partition() again to unpublish the child
partitions would fail, leaving the child partition nodes behind. When a new raw
device would then become available publishing its partitions would fail because
of these left behind nodes, causing bug #4587. Seeing that this code is more
compact and straight forward anyway I don't quite see why it was changed in the
first place.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34967 a95241bf-73f2-0310-859d-f6bbb57e9c96
LockAllSourceCaches()) and moved it to the beginning of the file.
* Removed sMappingLock and adjusted the locking policy for mapping/unmapping
pages: Since holding the lock of the affected pages' caches is already
required, that does now protect the page's mappings, too. The area mappings
are protected by the translation map lock, which we always acquire anyway
when mapping, unmapping, or looking up mappings.
The change results in a -j8 Haiku image build speedup of almost 10%. The
total kernel time drops almost 30%.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34965 a95241bf-73f2-0310-859d-f6bbb57e9c96
Apparently (at least when running in VMware >=2) the boot loader can still
map the same physical page more than once -- in the ACPI or HPET code I
suppose -- which would lead to this situation.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34954 a95241bf-73f2-0310-859d-f6bbb57e9c96
following function might otherwise not be shown correctly in ELF tools.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34952 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Moved hash computations out of the critical sections.
* Replaced the LRU entry queue by an array of entry "generations", each
containing a sparse array of entries of that generation. Whenever a
generation is full, we clear the oldest generation and continue with that
one. The main advantage of this algorithm is that entry cache's mutex could
be replaced by an r/w lock, that most of the time only has to be read
locked in Lookup(). This does dramatically decrease contention of that
lock.
The total -j8 Haiku image build speedup is marginal, but the kernel time
drops about 7% (now being smaller than the real time).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34950 a95241bf-73f2-0310-859d-f6bbb57e9c96
don't need it. That prevents us from ending up with the page being mapped
multiple times (under VMware at least) and thus fixes#5208.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34948 a95241bf-73f2-0310-859d-f6bbb57e9c96
allocate all pages the given range intersects with. When not page aligned
it could fail to allocate the last page.
* mmu_free():
- Adjusted semantics to be compatible with mmu_map_physical_memory().
- The validity check was broken, because page number and addresses were
mixed, and because KERNEL_BASE + kMaxKernelSize doesn't mark the end of
the allocated virtual ranges.
- The final check against sNextVirtualAddress was broken.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34947 a95241bf-73f2-0310-859d-f6bbb57e9c96
