A memory system of a processor-based system, comprising: a memory table comprising a plurality of memory table entries (110 - 110(x)) each comprising a usefulness indicator (112 - 112(x)); and a memory controller comprising a global polarity indicator ; the memory controller configured to, responsive to determining that replacement from the memory table is necessary: determine whether the global polarity indicator is not set; responsive to determining that the global polarity indicator is not set, interpret a value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table as inversely correlating to a usefulness of the memory table entry; responsive to determining that the global polarity indicator is set, interpret the value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table as directly correlating to the usefulness of the memory table entry; and select a least useful memory table entry of the plurality of memory table entries for replacement based on the interpreted value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table. a memory table comprising a plurality of memory table entries (110 - 110(x)) each comprising a usefulness indicator (112 - 112(x)); and a memory controller comprising a global polarity indicator ; the memory controller configured to, responsive to determining that replacement from the memory table is necessary: determine whether the global polarity indicator is not set; responsive to determining that the global polarity indicator is not set, interpret a value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table as inversely correlating to a usefulness of the memory table entry; responsive to determining that the global polarity indicator is set, interpret the value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table as directly correlating to the usefulness of the memory table entry; and select a least useful memory table entry of the plurality of memory table entries for replacement based on the interpreted value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table. determine whether the global polarity indicator is not set; responsive to determining that the global polarity indicator is not set, interpret a value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table as inversely correlating to a usefulness of the memory table entry; responsive to determining that the global polarity indicator is set, interpret the value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table as directly correlating to the usefulness of the memory table entry; and select a least useful memory table entry of the plurality of memory table entries for replacement based on the interpreted value of the usefulness indicator of each memory table entry of the plurality of memory table entries of the memory table. <EOS>