Methods, systems, and computer program products are included for deduplicating one or more memory pages. A method includes receiving a first key from a first application running on a computer system. The method also includes associating the first key with a first memory allocated to the first application and scanning a second memory for duplicate memory pages of the first memory. The second memory is associated with a second key and allocated to a second application running on the computer system. The method also includes in response to a determination that the first and second keys are the same and that a scanned memory page is a duplicate of a first memory page of the first memory, deduplicating the scanned memory page and the first memory page.