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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

@ -1,18 +1,20 @@
#pragma once
#include <AK/String.h>
#include <AK/Bitmap.h>
#include <AK/InlineLinkedList.h>
#include <AK/String.h>
#include <Kernel/Heap/SlabAllocator.h>
#include <Kernel/VM/PageDirectory.h>
#include <Kernel/VM/RangeAllocator.h>
class Inode;
class VMObject;
class Region : public RefCounted<Region>
class Region final : public RefCounted<Region>
, public InlineLinkedListNode<Region> {
friend class MemoryManager;
MAKE_SLAB_ALLOCATED(Region)
public:
enum Access {
Read = 1,