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LibWeb: Make VM allocation atomic for kernel regions

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Instead of first allocating the VM range, and then inserting a region
with that range into the MM region tree, we now do both things in a
single atomic operation:

    - RegionTree::place_anywhere(Region&, size, alignment)
    - RegionTree::place_specifically(Region&, address, size)

To reduce the number of things we do while locking the region tree,
we also require callers to provide a constructed Region object.
This commit is contained in:
Andreas Kling 2022-04-03 15:27:47 +02:00
parent cbf52d474c
commit e852a69a06
7 changed files with 85 additions and 57 deletions
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3
Kernel/Memory/RegionTree.h
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@ -34,6 +34,9 @@ public:
ErrorOr<NonnullOwnPtr<Region>> allocate_unbacked_anywhere(size_t size, size_t alignment = PAGE_SIZE);
ErrorOr<void> place_anywhere(Region&, size_t size, size_t alignment = PAGE_SIZE);
ErrorOr<void> place_specifically(Region&, VirtualRange const&);
ErrorOr<VirtualRange> try_allocate_anywhere(size_t size, size_t alignment = PAGE_SIZE);
ErrorOr<VirtualRange> try_allocate_specific(VirtualAddress base, size_t size);
ErrorOr<VirtualRange> try_allocate_randomized(size_t size, size_t alignment = PAGE_SIZE);