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Savestates/vm: rewrite memory saving for better compression

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Eladash 2023-12-28 18:48:46 +02:00 • committed by Elad Ashkenazi
parent d78bbbf69a
commit e14cc69441
1 changed files with 32 additions and 14 deletions
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46
rpcs3/Emu/Memory/vm.cpp
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@ -1624,19 +1624,22 @@ namespace vm
{ {
ensure((size % 4096) == 0); ensure((size % 4096) == 0);
for (usz iter_count = 0; size; iter_count++, ptr += 128 * 8) constexpr usz byte_of_pages = 128 * 8;
std::vector<u8> bit_array(size / byte_of_pages);
if (ar.is_writing())
{ {
const usz process_size = std::min<usz>(size, 128 * 8); auto data_ptr = ptr;
size -= process_size;
u8 bitmap = 0; for (usz iter_count = 0; iter_count < bit_array.size(); iter_count++, data_ptr += byte_of_pages)
if (ar.is_writing())
{ {
for (usz i = 0; i < process_size; i += 128 * 2) u8 bitmap = 0;
for (usz i = 0; i < byte_of_pages; i += 128 * 2)
{ {
const u64 sample64_1 = read_from_ptr<u64>(ptr, i); const u64 sample64_1 = read_from_ptr<u64>(data_ptr, i);
const u64 sample64_2 = read_from_ptr<u64>(ptr, i + 128); const u64 sample64_2 = read_from_ptr<u64>(data_ptr, i + 128);
// Speed up testing in scenarios where it is likely non-zero data // Speed up testing in scenarios where it is likely non-zero data
if (sample64_1 && sample64_2) if (sample64_1 && sample64_2)
@ -1645,15 +1648,30 @@ namespace vm
continue; continue;
} }
bitmap |= (check_cache_line_zero(ptr + i + 0) ? 0 : 1) << (i / 128); bitmap |= (check_cache_line_zero(data_ptr + i + 0) ? 0 : 1) << (i / 128);
bitmap |= (check_cache_line_zero(ptr + i + 128) ? 0 : 2) << (i / 128); bitmap |= (check_cache_line_zero(data_ptr + i + 128) ? 0 : 2) << (i / 128);
} }
// bitmap of 1024 bytes (bit is 128-byte)
ar(bitmap);
bit_array[iter_count] = bitmap;
} }
}
else
{
// Load bitmap
ar(std::span<u8>(bit_array.data(), bit_array.size()));
}
// bitmap of 1024 bytes (bit is 128-byte) ar.breathe();
ar(bitmap);
for (usz i = 0; i < process_size;) for (usz iter_count = 0; size; iter_count++, ptr += byte_of_pages)
{
size -= byte_of_pages;
const u8 bitmap = bit_array[iter_count];
for (usz i = 0; i < byte_of_pages;)
{ {
usz block_count = 0; usz block_count = 0;