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27cbb75e7c
This PR aims to reduce the memory usage in the CPU page table by moving GPU specific parameters into a child class. This saves 1Gb of Memory for most games.
42 lines
1.6 KiB
C++
42 lines
1.6 KiB
C++
// Copyright 2019 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/page_table.h"
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namespace Common {
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PageTable::PageTable(std::size_t page_size_in_bits) : page_size_in_bits{page_size_in_bits} {}
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PageTable::~PageTable() = default;
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void PageTable::Resize(std::size_t address_space_width_in_bits) {
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const std::size_t num_page_table_entries = 1ULL
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<< (address_space_width_in_bits - page_size_in_bits);
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pointers.resize(num_page_table_entries);
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attributes.resize(num_page_table_entries);
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// The default is a 39-bit address space, which causes an initial 1GB allocation size. If the
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// vector size is subsequently decreased (via resize), the vector might not automatically
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// actually reallocate/resize its underlying allocation, which wastes up to ~800 MB for
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// 36-bit titles. Call shrink_to_fit to reduce capacity to what's actually in use.
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pointers.shrink_to_fit();
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attributes.shrink_to_fit();
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}
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BackingPageTable::BackingPageTable(std::size_t page_size_in_bits) : PageTable{page_size_in_bits} {}
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BackingPageTable::~BackingPageTable() = default;
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void BackingPageTable::Resize(std::size_t address_space_width_in_bits) {
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PageTable::Resize(address_space_width_in_bits);
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const std::size_t num_page_table_entries = 1ULL
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<< (address_space_width_in_bits - page_size_in_bits);
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backing_addr.resize(num_page_table_entries);
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backing_addr.shrink_to_fit();
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}
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} // namespace Common
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