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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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5
Kernel/FileSystem/ProcFS.cpp
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@ -644,6 +644,11 @@ Optional<KBuffer> procfs$memstat(InodeIdentifier)
json.add("super_physical_available", MM.super_physical_pages());
json.add("kmalloc_call_count", g_kmalloc_call_count);
json.add("kfree_call_count", g_kfree_call_count);
slab_alloc_stats([&json](size_t slab_size, size_t num_allocated, size_t num_free) {
auto prefix = String::format("slab_%zu", slab_size);
json.add(String::format("%s_num_allocated", prefix.characters()), num_allocated);
json.add(String::format("%s_num_free", prefix.characters()), num_free);
});
json.finish();
return builder.build();
}