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LibJS: Recycle up to 64 HeapBlocks to improve performance :^)
This patch adds a BlockAllocator to the GC heap where we now cache up to 64 HeapBlock-sized mmap's that get recycled when allocating HeapBlocks. This improves test-js runtime performance by ~35%, pretty cool! :^)
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6 changed files with 101 additions and 8 deletions
58
Userland/Libraries/LibJS/Heap/BlockAllocator.cpp
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58
Userland/Libraries/LibJS/Heap/BlockAllocator.cpp
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/*
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* Copyright (c) 2021, 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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#include <AK/Vector.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/BlockAllocator.h>
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#include <LibJS/Heap/HeapBlock.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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namespace JS {
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BlockAllocator::BlockAllocator()
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{
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}
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BlockAllocator::~BlockAllocator()
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{
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for (auto* block : m_blocks) {
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if (munmap(block, HeapBlock::block_size) < 0) {
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perror("munmap");
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VERIFY_NOT_REACHED();
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}
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}
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}
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void* BlockAllocator::allocate_block([[maybe_unused]] char const* name)
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{
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if (!m_blocks.is_empty())
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return m_blocks.take_last();
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#ifdef __serenity__
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auto* block = (HeapBlock*)serenity_mmap(nullptr, HeapBlock::block_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_RANDOMIZED | MAP_PRIVATE, 0, 0, HeapBlock::block_size, name);
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#else
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auto* block = (HeapBlock*)aligned_alloc(HeapBlock::block_size, HeapBlock::block_size);
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#endif
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VERIFY(block != MAP_FAILED);
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return block;
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}
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void BlockAllocator::deallocate_block(void* block)
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{
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VERIFY(block);
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if (m_blocks.size() >= max_cached_blocks) {
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if (munmap(block, HeapBlock::block_size) < 0) {
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perror("munmap");
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VERIFY_NOT_REACHED();
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}
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return;
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}
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m_blocks.append(block);
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}
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}
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