uint64_t MultiQueueMigrator::GetRealChannel( MQMigrator *at, NVMAddress address )
{
if(at->IsMigrated(address))
{
return at->GetNewChannel(address);
}
return address.GetChannel();
}
void MQMigrator::StartMigration( NVMAddress& promotee, NVMAddress& demotee )
{
/*
* The address being demoted is assumed to be in the "fast" memory and
* the address being promoted in the slow memory, therefore we define
* the promotion channel as the demotion address' value and similarly
* for demotion channel.
*/
//std::cout<<"start migration"<<std::endl;
uint64_t demoChannel, promoChannel;
demoChannel = promotee.GetChannel( );
promoChannel = demotee.GetChannel( );
/* Get unique keys for each page to migrate. */
uint64_t promokey = GetAddressKey( promotee );
uint64_t demokey = GetAddressKey( demotee );
/* Ensure we are not already migrating a page. */
assert( migrating == false );
/*
* Set the new channel decodings immediately, but mark the migration
* as being in progress.
*/
migrationMap[promokey] = promoChannel;
migrationMap[demokey] = demoChannel;
//std::cout<<"key promo:"<<promokey<<" state is:"<<MQ_MIGRATION_READING<<std::endl;
//std::cout<<"key demo:"<<demokey<<" state is:"<<MQ_MIGRATION_READING<<std::endl;
migrationState[promokey] = MQ_MIGRATION_READING;
migrationState[demokey] = MQ_MIGRATION_READING;
/*
* Only one migration is allowed at a time; These values hold the
* key values for each migration page and marks a migration in
* progress.
*/
migrating = true;
inputPage = promokey;
outputPage = demokey;
}
