Patent ID: 8364915

Claim:
An apparatus comprising: a tracking list including a set of entries, each entry of the set of entries to store state information based on a respective touch message indicating that a respective memory group has been touched, the memory group including one or more memory regions in a set of memory regions, each entry having: a valid field to store respective validity data specifying whether the entry stores a set of default data; and a group field to store a respective memory group identifier associating a memory region in the set of memory regions with a respective memory group in one or more memory groups; and touch detection logic coupled to the tracking list to generate access information specific to a memory group, the access information describing an accessing of one or more memory regions of the memory group, wherein the access information is generated based on the validity data in a first entry of the set of entries and the memory group identifier in the first entry, wherein the touch detection logic to generate access information includes the touch detection logic to perform a NORM instruction on a register including a set of group-valid values, each group-valid value determined based on validity data and a group identifier of a respective one of the set of entries, the NORM instruction to XOR a most significant bit of the register with another bit of the register.