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f89e8fb71a
This implements the macOS API malloc_good_size() which returns the true allocation size for a given requested allocation size. This allows us to make use of all the available memory in a malloc chunk. For example, for a malloc request of 35 bytes our malloc would internally use a chunk of size 64, however the remaining 29 bytes would be unused. Knowing the true allocation size allows us to request more usable memory that would otherwise be wasted and make that available for Vector, HashTable and potentially other callers in the future.
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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#include <Kernel/Debug.h>
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#define KMALLOC_SCRUB_BYTE 0xbb
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#define KFREE_SCRUB_BYTE 0xaa
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#define MAKE_ALIGNED_ALLOCATED(type, alignment) \
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public: \
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[[nodiscard]] void* operator new(size_t) noexcept { return kmalloc_aligned<alignment>(sizeof(type)); } \
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void operator delete(void* ptr) noexcept { kfree_aligned(ptr); } \
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\
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private:
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void kmalloc_init();
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_impl(size_t);
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_eternal(size_t);
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void* krealloc(void*, size_t);
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void kfree(void*);
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struct kmalloc_stats {
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size_t bytes_allocated;
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size_t bytes_free;
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size_t bytes_eternal;
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size_t kmalloc_call_count;
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size_t kfree_call_count;
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};
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void get_kmalloc_stats(kmalloc_stats&);
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extern bool g_dump_kmalloc_stacks;
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inline void* operator new(size_t, void* p) { return p; }
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inline void* operator new[](size_t, void* p) { return p; }
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[[nodiscard]] void* operator new(size_t size) noexcept;
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void operator delete(void* ptr) noexcept;
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void operator delete(void* ptr, size_t) noexcept;
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[[nodiscard]] void* operator new[](size_t size) noexcept;
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void operator delete[](void* ptrs) noexcept;
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void operator delete[](void* ptr, size_t) noexcept;
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc(size_t);
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template<size_t ALIGNMENT>
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] inline void* kmalloc_aligned(size_t size)
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{
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static_assert(ALIGNMENT > sizeof(ptrdiff_t));
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static_assert(ALIGNMENT <= 4096);
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void* ptr = kmalloc(size + ALIGNMENT + sizeof(ptrdiff_t));
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size_t max_addr = (size_t)ptr + ALIGNMENT;
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void* aligned_ptr = (void*)(max_addr - (max_addr % ALIGNMENT));
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((ptrdiff_t*)aligned_ptr)[-1] = (ptrdiff_t)((u8*)aligned_ptr - (u8*)ptr);
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return aligned_ptr;
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}
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inline void kfree_aligned(void* ptr)
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{
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kfree((u8*)ptr - ((const ptrdiff_t*)ptr)[-1]);
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}
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size_t kmalloc_good_size(size_t);
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void kmalloc_enable_expand();
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