Bloom filter integration into a controller

An apparatus, comprising:

• a memory device having a refresh interval comprising a maximum time interval between refresh operations of the memory device;
• and
• a memory controller coupled to the memory device, the memory controller including a first counting bloom filter and a second counting bloom filter, wherein the memory controller is configured to:
• detect whether an activate command is in a portion of the memory device that is being monitored by the first counting bloom filter and the second counting bloom filter, wherein the first counting bloom filter and the second counting bloom filter are integrated into the memory controller;
• increment the first counting bloom filter and the second counting bloom filter in response to a portion of the memory device that is being monitored by the first counting bloom filter and the second counting bloom filter receiving a row activate command;
• determine whether a first value of the first counting bloom filter or a second value of the second counting bloom filter exceeds a threshold value for row hammer detection on alternating refresh intervals, out of phase with each other, wherein the memory controller is configured to skip the determination of whether the first value of the first counting bloom filter or the second value of the second counting bloom filter exceeds the threshold value for row hammer detection for an initial refresh interval and determine whether the first value of the first counting bloom filter or the second value of the second counting bloom filter exceeds the threshold value for row hammer detection during a second refresh interval;
• and
• perform row hammer mitigation in response to the first value or the second value exceeding the threshold value for row hammer detection.

A method, comprising:

• detecting whether a row activate command is in a portion of a memory device that is being monitored by a counting bloom filter, wherein the counting bloom filter is integrated into a memory controller and the memory device has a refresh interval comprising a maximum time interval between refresh operations of the memory device;
• in response to the row activate command being detected in the portion of the memory device that is being monitored by the counting bloom filter, incrementing a corresponding value of the counting bloom;
• determining whether the corresponding value of the counting bloom filter exceeds a threshold value of row hammer detection, wherein the memory controller is configured to skip the determination of whether the value of the counting bloom filter exceeds the threshold value of row hammer detection for an initial refresh interval and determine whether the corresponding value of the counting bloom filter exceeds the threshold value for row hammer detection during a second refresh interval;
• and
• executing, by the memory controller, row hammer mitigation in response to the corresponding value exceeding the threshold value of row hammer detection.