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[dynarmic, common] pagetable clustering (#3215)

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Raises the size of each page entry to 32 bytes, however, it merges them into a single structure
THEORETICALLY this is better since the access pattern observed corresponds to the program wanting backing_addr/pointers/blocks immediately after one another.
This may improve performance at the cost of some extra memory.
Another implementation would be to structure only backing_addr/blocks within the same virtual buffer.
Alas spamming virtual buffers is evil since each of them is a cache trasher (imagine jumping from wildly different block to wildly different block immediately).

Signed-off-by: lizzie lizzie@eden-emu.dev

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3215
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>
This commit is contained in:
lizzie 2026-01-13 00:27:31 +01:00 • committed by crueter
parent 1cb8bcf531
commit dceeccd04b
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GPG key ID: 425ACD2D4830EBC6
13 changed files with 103 additions and 108 deletions
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8
src/core/arm/dynarmic/arm_dynarmic_32.cpp
View file

@ -186,11 +186,13 @@ std::shared_ptr<Dynarmic::A32::Jit> ArmDynarmic32::MakeJit(Common::PageTable* pa
if (page_table) {
constexpr size_t PageBits = 12;
constexpr size_t NumPageTableEntries = 1 << (32 - PageBits);
constexpr size_t PageLog2Stride = 5;
static_assert(1 << PageLog2Stride == sizeof(Common::PageTable::PageEntryData));
config.page_table = reinterpret_cast<std::array<std::uint8_t*, NumPageTableEntries>*>(
page_table->pointers.data());
config.absolute_offset_page_table = true;
config.page_table = reinterpret_cast<std::array<std::uint8_t*, NumPageTableEntries>*>(page_table->entries.data());
config.page_table_pointer_mask_bits = Common::PageTable::ATTRIBUTE_BITS;
config.page_table_log2_stride = PageLog2Stride;
config.absolute_offset_page_table = true;
config.detect_misaligned_access_via_page_table = 16 | 32 | 64 | 128;
config.only_detect_misalignment_via_page_table_on_page_boundary = true;

6
src/core/arm/dynarmic/arm_dynarmic_64.cpp
View file

@ -233,9 +233,13 @@ std::shared_ptr<Dynarmic::A64::Jit> ArmDynarmic64::MakeJit(Common::PageTable* pa
// Memory
if (page_table) {
config.page_table = reinterpret_cast<void**>(page_table->pointers.data());
constexpr size_t PageLog2Stride = 5;
static_assert(1 << PageLog2Stride == sizeof(Common::PageTable::PageEntryData));
config.page_table = reinterpret_cast<void**>(page_table->entries.data());
config.page_table_address_space_bits = std::uint32_t(address_space_bits);
config.page_table_pointer_mask_bits = Common::PageTable::ATTRIBUTE_BITS;
config.page_table_log2_stride = PageLog2Stride;
config.silently_mirror_page_table = false;
config.absolute_offset_page_table = true;
config.detect_misaligned_access_via_page_table = 16 | 32 | 64 | 128;