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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.
This commit is contained in:
Andreas Kling 2019-09-16 10:19:44 +02:00
parent 1c692e87a6
commit 5d491fa1cd
7 changed files with 150 additions and 2 deletions

View file

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#pragma once
#include <AK/Function.h>
#include <AK/Types.h>
class JsonObjectSerializer;
void* slab_alloc(size_t slab_size);
void slab_dealloc(void*, size_t slab_size);
void slab_alloc_init();
void slab_alloc_stats(Function<void(size_t slab_size, size_t allocated, size_t free)>);
#define MAKE_SLAB_ALLOCATED(type) \
public: \
void* operator new(size_t) { return slab_alloc(sizeof(type)); } \
void operator delete(void* ptr) { slab_dealloc(ptr, sizeof(type)); } \
\
private: