According to an example, PM controller based atomicity assurance may include receiving data that is related to an application for storage in a PM. PM controller based atomicity assurance may further include receiving an indication of an atomic transaction that is related to the data, and receiving an indication to generate a CP that is related to the atomic transaction. The CP may be generated in a PM staging area. A determination may be made as to whether the CP in the PM staging area is closed or open. In response to a determination that the CP in the PM staging area is closed, content related to the CP may be propagated to the PM.