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https://github.com/SerenityOS/serenity
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ac7ce12123
This was a premature optimization from the early days of SerenityOS. The eternal heap was a simple bump pointer allocator over a static byte array. My original idea was to avoid heap fragmentation and improve data locality, but both ideas were rooted in cargo culting, not data. We would reserve 4 MiB at boot and only ended up using ~256 KiB, wasting the rest. This patch replaces all kmalloc_eternal() usage by regular kmalloc().
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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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/OwnPtr.h>
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#include <Kernel/Memory/PhysicalPage.h>
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#include <Kernel/Memory/PhysicalZone.h>
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namespace Kernel::Memory {
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class PhysicalRegion {
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AK_MAKE_NONCOPYABLE(PhysicalRegion);
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AK_MAKE_NONMOVABLE(PhysicalRegion);
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public:
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static OwnPtr<PhysicalRegion> try_create(PhysicalAddress lower, PhysicalAddress upper)
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{
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return adopt_own_if_nonnull(new PhysicalRegion { lower, upper });
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}
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~PhysicalRegion();
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void initialize_zones();
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PhysicalAddress lower() const { return m_lower; }
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PhysicalAddress upper() const { return m_upper; }
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unsigned size() const { return m_pages; }
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bool contains(PhysicalAddress paddr) const { return paddr >= m_lower && paddr < m_upper; }
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OwnPtr<PhysicalRegion> try_take_pages_from_beginning(unsigned);
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RefPtr<PhysicalPage> take_free_page();
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NonnullRefPtrVector<PhysicalPage> take_contiguous_free_pages(size_t count);
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void return_page(PhysicalAddress);
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private:
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PhysicalRegion(PhysicalAddress lower, PhysicalAddress upper);
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static constexpr size_t large_zone_size = 16 * MiB;
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static constexpr size_t small_zone_size = 1 * MiB;
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NonnullOwnPtrVector<PhysicalZone> m_zones;
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size_t m_large_zones { 0 };
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PhysicalZone::List m_usable_zones;
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PhysicalZone::List m_full_zones;
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PhysicalAddress m_lower;
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PhysicalAddress m_upper;
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unsigned m_pages { 0 };
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};
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}
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