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Kernel: Add a simple slab allocator for small allocations

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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
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2
Kernel/init.cpp
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@ -29,6 +29,7 @@
#include <Kernel/FileSystem/ProcFS.h>
#include <Kernel/FileSystem/TmpFS.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Heap/SlabAllocator.h>
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/KParams.h>
#include <Kernel/Multiboot.h>
@ -187,6 +188,7 @@ extern "C" [[noreturn]] void init()
sse_init();
kmalloc_init();
slab_alloc_init();
init_ksyms();
// must come after kmalloc_init because we use AK_MAKE_ETERNAL in KParams