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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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5
Userland/Libraries/LibJS/Heap/Heap.h
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@ -14,6 +14,7 @@
#include <LibCore/Forward.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/Allocator.h>
#include <LibJS/Heap/BlockAllocator.h>
#include <LibJS/Heap/Cell.h>
#include <LibJS/Heap/Handle.h>
#include <LibJS/Runtime/Object.h>
@ -72,6 +73,8 @@ public:
void defer_gc(Badge<DeferGC>);
void undefer_gc(Badge<DeferGC>);
BlockAllocator& block_allocator() { return m_block_allocator; }
private:
Cell* allocate_cell(size_t);
@ -103,6 +106,8 @@ private:
HashTable<MarkedValueList*> m_marked_value_lists;
BlockAllocator m_block_allocator;
size_t m_gc_deferrals { 0 };
bool m_should_gc_when_deferral_ends { false };