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LibJS: Recycle up to 64 HeapBlocks to improve performance :^)

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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! :^)
This commit is contained in:
Andreas Kling 2021-05-27 19:01:26 +02:00
parent d2149c153c
commit e9081a2644
6 changed files with 101 additions and 8 deletions
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8
Userland/Libraries/LibJS/Heap/HeapBlock.cpp
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@ -6,6 +6,7 @@
#include <AK/Assertions.h>
#include <AK/NonnullOwnPtr.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Heap/HeapBlock.h>
#include <stdio.h>
#include <sys/mman.h>
@ -16,12 +17,7 @@ NonnullOwnPtr<HeapBlock> HeapBlock::create_with_cell_size(Heap& heap, size_t cel
{
char name[64];
snprintf(name, sizeof(name), "LibJS: HeapBlock(%zu)", cell_size);
#ifdef __serenity__
auto* block = (HeapBlock*)serenity_mmap(nullptr, block_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_RANDOMIZED | MAP_PRIVATE, 0, 0, block_size, name);
#else
auto* block = (HeapBlock*)aligned_alloc(block_size, block_size);
#endif
VERIFY(block != MAP_FAILED);
auto* block = static_cast<HeapBlock*>(heap.block_allocator().allocate_block(name));
new (block) HeapBlock(heap, cell_size);
return NonnullOwnPtr<HeapBlock>(NonnullOwnPtr<HeapBlock>::Adopt, *block);
}