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Disk: NeoMemory: Cache last read sector for one second

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This prevents constant re-reads if reading in small chunks
This commit is contained in:
Paul Hollinsky
2022-02-28 01:55:31 -05:00
parent 4ef8fe8794
commit 4c9d6c5ee7
2 changed files with 34 additions and 21 deletions
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disk/neomemorydiskreaddriver.cpp
+28 -21
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@@ -12,30 +12,37 @@ optional<uint64_t> NeoMemoryDiskReadDriver::readLogicalDiskAligned(Communication
if(amount != SectorSize)
return 0;
const uint64_t currentSector = pos / SectorSize;
auto msg = com.waitForMessageSync([&currentSector, &com] {
return com.sendCommand(Command::NeoReadMemory, {
MemoryTypeSD,
uint8_t(currentSector & 0xFF),
uint8_t((currentSector >> 8) & 0xFF),
uint8_t((currentSector >> 16) & 0xFF),
uint8_t((currentSector >> 24) & 0xFF),
uint8_t(SectorSize & 0xFF),
uint8_t((SectorSize >> 8) & 0xFF),
uint8_t((SectorSize >> 16) & 0xFF),
uint8_t((SectorSize >> 24) & 0xFF)
});
}, NeoMemorySDRead, timeout);
if(cachePos != pos || std::chrono::steady_clock::now() > cachedAt + CacheTime) {
// The cache does not have this data, go get it
const uint64_t currentSector = pos / SectorSize;
auto msg = com.waitForMessageSync([&currentSector, &com] {
return com.sendCommand(Command::NeoReadMemory, {
MemoryTypeSD,
uint8_t(currentSector & 0xFF),
uint8_t((currentSector >> 8) & 0xFF),
uint8_t((currentSector >> 16) & 0xFF),
uint8_t((currentSector >> 24) & 0xFF),
uint8_t(SectorSize & 0xFF),
uint8_t((SectorSize >> 8) & 0xFF),
uint8_t((SectorSize >> 16) & 0xFF),
uint8_t((SectorSize >> 24) & 0xFF)
});
}, NeoMemorySDRead, timeout);
if(!msg)
return 0;
if(!msg)
return 0;
const auto sdmsg = std::dynamic_pointer_cast<NeoReadMemorySDMessage>(msg);
if(!sdmsg || sdmsg->data.size() != SectorSize) {
report(APIEvent::Type::PacketDecodingError, APIEvent::Severity::Error);
return nullopt;
const auto sdmsg = std::dynamic_pointer_cast<NeoReadMemorySDMessage>(msg);
if(!sdmsg || sdmsg->data.size() != SectorSize) {
report(APIEvent::Type::PacketDecodingError, APIEvent::Severity::Error);
return nullopt;
}
memcpy(cache.data(), sdmsg->data.data(), SectorSize);
cachedAt = std::chrono::steady_clock::now();
cachePos = pos;
}
memcpy(into, sdmsg->data.data(), SectorSize);
memcpy(into, cache.data(), SectorSize);
return SectorSize;
}