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| author | Fernando Sahmkow <fsahmkow27@gmail.com> | 2020-03-13 16:33:47 -0400 |
|---|---|---|
| committer | FernandoS27 <fsahmkow27@gmail.com> | 2020-03-14 09:43:57 -0400 |
| commit | 27cbb75e7c2818c073bd65a000d7ff7f28d391d4 (patch) | |
| tree | 1f8ff16d5202fde0e15f8a8f7c5d50045efb9341 /src/common/page_table.cpp | |
| parent | b30b1f741dcbcb69672d065b0bec4f4a9e5f0993 (diff) | |
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.
Diffstat (limited to 'src/common/page_table.cpp')
| -rw-r--r-- | src/common/page_table.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/common/page_table.cpp b/src/common/page_table.cpp index 69b7abc544..566b57b622 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(); } |