mirror of
https://github.com/starr-dusT/yuzu-mainline
synced 2024-03-05 21:12:25 -08:00
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
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include "common/page_table.h"
|
|
|
|
namespace Common {
|
|
|
|
PageTable::PageTable(std::size_t page_size_in_bits) : page_size_in_bits{page_size_in_bits} {}
|
|
|
|
PageTable::~PageTable() = default;
|
|
|
|
void PageTable::Resize(std::size_t address_space_width_in_bits) {
|
|
const std::size_t num_page_table_entries = 1ULL
|
|
<< (address_space_width_in_bits - page_size_in_bits);
|
|
|
|
pointers.resize(num_page_table_entries);
|
|
attributes.resize(num_page_table_entries);
|
|
|
|
// The default is a 39-bit address space, which causes an initial 1GB allocation size. If the
|
|
// vector size is subsequently decreased (via resize), the vector might not automatically
|
|
// actually reallocate/resize its underlying allocation, which wastes up to ~800 MB for
|
|
// 36-bit titles. Call shrink_to_fit to reduce capacity to what's actually in use.
|
|
|
|
pointers.shrink_to_fit();
|
|
attributes.shrink_to_fit();
|
|
}
|
|
|
|
BackingPageTable::BackingPageTable(std::size_t page_size_in_bits) : PageTable{page_size_in_bits} {}
|
|
|
|
BackingPageTable::~BackingPageTable() = default;
|
|
|
|
void BackingPageTable::Resize(std::size_t address_space_width_in_bits) {
|
|
PageTable::Resize(address_space_width_in_bits);
|
|
const std::size_t num_page_table_entries = 1ULL
|
|
<< (address_space_width_in_bits - page_size_in_bits);
|
|
backing_addr.resize(num_page_table_entries);
|
|
backing_addr.shrink_to_fit();
|
|
}
|
|
|
|
} // namespace Common
|