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https://github.com/LadybirdBrowser/ladybird.git
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02a95a196f
This patch stops using VirtualRangeAllocator in AddressSpace and instead looks for holes in the region tree when allocating VM space. There are many benefits: - VirtualRangeAllocator is non-intrusive and would call kmalloc/kfree when used. This new solution is allocation-free. This was a source of unpleasant MM/kmalloc deadlocks. - We consolidate authority on what the address space looks like in a single place. Previously, we had both the range allocator *and* the region tree both being used to determine if an address was valid. Now there is only the region tree. - Deallocation of VM when splitting regions is no longer complicated, as we don't need to keep two separate trees in sync.
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Leon Albrecht <leon2002.la@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/RedBlackTree.h>
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#include <AK/Vector.h>
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#include <AK/WeakPtr.h>
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#include <Kernel/Memory/AllocationStrategy.h>
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#include <Kernel/Memory/PageDirectory.h>
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#include <Kernel/Memory/Region.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel::Memory {
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class AddressSpace {
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public:
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static ErrorOr<NonnullOwnPtr<AddressSpace>> try_create(AddressSpace const* parent);
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~AddressSpace();
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PageDirectory& page_directory() { return *m_page_directory; }
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PageDirectory const& page_directory() const { return *m_page_directory; }
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ErrorOr<Region*> add_region(NonnullOwnPtr<Region>);
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size_t region_count() const { return m_regions.size(); }
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auto& regions() { return m_regions; }
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auto const& regions() const { return m_regions; }
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void dump_regions();
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ErrorOr<void> unmap_mmap_range(VirtualAddress, size_t);
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ErrorOr<VirtualRange> try_allocate_range(VirtualAddress, size_t, size_t alignment = PAGE_SIZE);
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ErrorOr<Region*> allocate_region_with_vmobject(VirtualRange const&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, StringView name, int prot, bool shared);
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ErrorOr<Region*> allocate_region(VirtualRange const&, StringView name, int prot = PROT_READ | PROT_WRITE, AllocationStrategy strategy = AllocationStrategy::Reserve);
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void deallocate_region(Region& region);
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NonnullOwnPtr<Region> take_region(Region& region);
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ErrorOr<Region*> try_allocate_split_region(Region const& source_region, VirtualRange const&, size_t offset_in_vmobject);
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ErrorOr<Vector<Region*, 2>> try_split_region_around_range(Region const& source_region, VirtualRange const&);
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Region* find_region_from_range(VirtualRange const&);
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Region* find_region_containing(VirtualRange const&);
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ErrorOr<Vector<Region*>> find_regions_intersecting(VirtualRange const&);
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bool enforces_syscall_regions() const { return m_enforces_syscall_regions; }
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void set_enforces_syscall_regions(bool b) { m_enforces_syscall_regions = b; }
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void remove_all_regions(Badge<Process>);
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RecursiveSpinlock& get_lock() const { return m_lock; }
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ErrorOr<size_t> amount_clean_inode() const;
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size_t amount_dirty_private() const;
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size_t amount_virtual() const;
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size_t amount_resident() const;
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size_t amount_shared() const;
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size_t amount_purgeable_volatile() const;
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size_t amount_purgeable_nonvolatile() const;
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ErrorOr<VirtualRange> try_allocate_anywhere(size_t size, size_t alignment);
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ErrorOr<VirtualRange> try_allocate_specific(VirtualAddress base, size_t size);
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ErrorOr<VirtualRange> try_allocate_randomized(size_t size, size_t alignment);
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private:
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AddressSpace(NonnullRefPtr<PageDirectory>, VirtualRange total_range);
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void delete_all_regions_assuming_they_are_unmapped();
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mutable RecursiveSpinlock m_lock;
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RefPtr<PageDirectory> m_page_directory;
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IntrusiveRedBlackTree<&Region::m_tree_node> m_regions;
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VirtualRange const m_total_range;
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bool m_enforces_syscall_regions { false };
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};
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}
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