Bananymous
675c215e6a
This speeds up fork by A LOT. Forking WindowServer took ~90 ms before this and now its ~5 ms.
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
#pragma once
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#include <kernel/Memory/MemoryRegion.h>
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namespace Kernel
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{
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class MemoryBackedRegion final : public MemoryRegion
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{
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BAN_NON_COPYABLE(MemoryBackedRegion);
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BAN_NON_MOVABLE(MemoryBackedRegion);
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public:
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static BAN::ErrorOr<BAN::UniqPtr<MemoryBackedRegion>> create(PageTable&, size_t size, AddressRange, Type, PageTable::flags_t, int status_flags);
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~MemoryBackedRegion();
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BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> clone(PageTable& new_page_table) override;
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BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> split(size_t offset) override;
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BAN::ErrorOr<void> msync(vaddr_t, size_t, int) override { return {}; }
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// Copy data from buffer into this region
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// This can fail if no memory is mapped and no free memory was available
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BAN::ErrorOr<void> copy_data_to_region(size_t offset_into_region, const uint8_t* buffer, size_t buffer_size);
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protected:
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BAN::ErrorOr<bool> allocate_page_containing_impl(vaddr_t vaddr, bool wants_write) override;
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private:
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MemoryBackedRegion(PageTable&, size_t size, Type, PageTable::flags_t, int status_flags);
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private:
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struct PhysicalPage
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{
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PhysicalPage(paddr_t paddr)
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: paddr(paddr)
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{ }
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~PhysicalPage();
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BAN::Atomic<uint32_t> ref_count { 1 };
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const paddr_t paddr;
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};
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BAN::Vector<PhysicalPage*> m_physical_pages;
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Mutex m_mutex;
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};
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}
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