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Kernel: Add a simple slab allocator for small allocations
This is a freelist allocator with static size classes that works as a complement to the generic kmalloc(). It's a lot faster than kmalloc() since allocation just means popping from the freelist. It's also significantly more compact when there are a lot of objects smaller than the minimum kmalloc chunk size (32 bytes.) This patch enables it for the Region and PhysicalPage classes. In the PhysicalPage (8 bytes) case, it's a huge improvement since we no longer waste 75% of the storage allocated. There are also a number of ways this can be improved, so let's keep working on it going forward.
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7 changed files with 150 additions and 2 deletions
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#pragma once
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#include <AK/String.h>
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#include <AK/Bitmap.h>
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#include <AK/InlineLinkedList.h>
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#include <AK/String.h>
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#include <Kernel/Heap/SlabAllocator.h>
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#include <Kernel/VM/PageDirectory.h>
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#include <Kernel/VM/RangeAllocator.h>
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class Inode;
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class VMObject;
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class Region : public RefCounted<Region>
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class Region final : public RefCounted<Region>
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, public InlineLinkedListNode<Region> {
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friend class MemoryManager;
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MAKE_SLAB_ALLOCATED(Region)
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public:
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enum Access {
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Read = 1,
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