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Supporting unbounded transactions and operating system (OS) are two notable challenges that need to be efficiently resolved by practically accepted hardware transaction memory (HTM) systems. Current proposals that heavily rely on traditional cache system to handle version management or conflict detection support poorly to resolve these two challenges. Traditional approach brings either unavoidable design complexity or large performance costs. We propose DTM (decoupled transactional memory), a comprehensive hardware-based solution which follows a new design approach that fully decouples transaction processing from traditional cache system to resolve these two challenges.