From 27cbb75e7c2818c073bd65a000d7ff7f28d391d4 Mon Sep 17 00:00:00 2001 From: Fernando Sahmkow Date: Fri, 13 Mar 2020 16:33:47 -0400 Subject: PageTable: move backing addresses to a children class as the CPU page table does not need them. 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. --- src/common/page_table.cpp | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'src/common/page_table.cpp') diff --git a/src/common/page_table.cpp b/src/common/page_table.cpp index 69b7abc54..566b57b62 100644 --- a/src/common/page_table.cpp +++ b/src/common/page_table.cpp @@ -16,7 +16,6 @@ void PageTable::Resize(std::size_t address_space_width_in_bits) { pointers.resize(num_page_table_entries); attributes.resize(num_page_table_entries); - backing_addr.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 @@ -25,6 +24,17 @@ void PageTable::Resize(std::size_t address_space_width_in_bits) { 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(); } -- cgit v1.2.3