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LibJS: Save min and max block addresses in CellAllocator

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This allows to skip iterating through all allocated blocks in
`find_min_and_max_block_addresses()`.

With this change `collect_garbage()` in profiles of Discord goes down
from 17% to 8%.
This commit is contained in:
Aliaksandr Kalenik 2024-04-23 16:53:59 +02:00 committed by Andreas Kling
parent 55154b6c68
commit 1072d9f15d
Notes: sideshowbarker 2024-07-17 04:10:16 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/1072d9f15d
Pull-request: https://github.com/SerenityOS/serenity/pull/24084
3 changed files with 13 additions and 5 deletions
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5
Userland/Libraries/LibJS/Heap/CellAllocator.cpp
View File

@ -25,6 +25,11 @@ Cell* CellAllocator::allocate_cell(Heap& heap)
if (m_usable_blocks.is_empty()) {
auto block = HeapBlock::create_with_cell_size(heap, *this, m_cell_size, m_class_name);
auto block_ptr = reinterpret_cast<FlatPtr>(block.ptr());
if (m_min_block_address > block_ptr)
m_min_block_address = block_ptr;
if (m_max_block_address < block_ptr)
m_max_block_address = block_ptr;
m_usable_blocks.append(*block.leak_ptr());
}

4
Userland/Libraries/LibJS/Heap/CellAllocator.h
View File

@ -51,6 +51,8 @@ public:
using List = IntrusiveList<&CellAllocator::m_list_node>;
BlockAllocator& block_allocator() { return m_block_allocator; }
FlatPtr min_block_address() const { return m_min_block_address; }
FlatPtr max_block_address() const { return m_max_block_address; }
private:
char const* const m_class_name { nullptr };
@ -61,6 +63,8 @@ private:
using BlockList = IntrusiveList<&HeapBlock::m_list_node>;
BlockList m_full_blocks;
BlockList m_usable_blocks;
FlatPtr m_min_block_address { explode_byte(0xff) };
FlatPtr m_max_block_address { 0 };
};
template<typename T>

9
Userland/Libraries/LibJS/Heap/Heap.cpp
View File

@ -112,11 +112,10 @@ void Heap::find_min_and_max_block_addresses(FlatPtr& min_address, FlatPtr& max_a
{
min_address = explode_byte(0xff);
max_address = 0;
for_each_block([&](auto& block) {
min_address = min(min_address, reinterpret_cast<FlatPtr>(&block));
max_address = max(max_address, reinterpret_cast<FlatPtr>(&block) + HeapBlockBase::block_size);
return IterationDecision::Continue;
});
for (auto& allocator : m_all_cell_allocators) {
min_address = min(min_address, allocator.min_block_address());
max_address = max(max_address, allocator.max_block_address() + HeapBlockBase::block_size);
}
}
template<typename Callback>