Technologies are generally described for methods and systems effective to store data in a memory module. The memory module may include a volatile portion and a non-volatile portion. The methods may comprise receiving, by a processor, a request to store the data. The request may include an indication of a virtual address. The methods may further include determining, by the processor, a persistency of the data based on the virtual address. The methods may further include performing a first operation of identifying a particular portion of the memory module based on the virtual address. The methods may further include generating a command to store the data in the particular portion of the memory module. The methods may further include controlling the operating system to perform a second operation of updating a translation lookaside buffer to indicate the persistency of the data.