Memory control apparatus and memory control method for swapping data based on data characteristics

A computer-implemented memory control method comprising:

• adding, to management information, first identification information and information indicating a position where first data is stored when the first data is stored in a first memory having a first transfer rate;
• adding, to the management information, information indicating a position where second data is stored when the second data is stored in a second memory having a second transfer rate lower than the first transfer rate, the second data being data swapped out from the first memory to the second memory based on data characteristics of the second data;
• adding, to the management information, second identification information and information indicating a position where third data is stored when the third data is stored in a third memory having a third transfer rate lower than the second transfer rate, the third data being data swapped out from the first memory to the third memory based on data characteristics of the third data;
• determining, by referring to the management information, which one of the first identification information and the second identification information is associated with fourth data when the fourth data is accessed;
• retrieving the fourth data from the first memory or the second memory in accordance with information, stored in the management information, indicating a position where the fourth data is stored, when the first identification information is associated with the fourth data;
• determining swap-in of the third data into the first memory or the second memory from the third memory;
• and
• determining whether third data is swap-in by copying or swap-in by moving, according to a write frequency included in the data characteristics of the third data.

A non-transitory computer-readable medium storing instructions executable by one or more computers, the instructions comprising:

• one or more instructions for adding, to management information, first identification information and information indicating a position where first data is stored when the first data is stored in a first memory having a first transfer rate;
• one or more instructions for adding, to the management information, information indicating a position where second data is stored when the second data is stored in a second memory having a second transfer rate lower than the first transfer rate, the second data being data swapped out from the first memory to the second memory based on data characteristics of the second data;
• one or more instructions for adding, to the management information, second identification information and information indicating a position where third data is stored when the third data is stored in a third memory having a third transfer rate lower than the second transfer rate, the third data is data swapped out from the first memory to the third memory based on data characteristics of the third data;
• one or more instructions for determining, by referring to the management information, which one of the first identification information and the second identification information is associated with fourth data when the fourth data is accessed;
• one or more instructions for retrieving the fourth data from the first memory or the second memory in accordance with information, stored in the management information, indicating a position where the fourth data is stored, when the first identification information is associated with the fourth data;
• one or more instructions for determining swap-in of the third data into the first memory or the second memory from the third memory;
• and
• one or more instructions for determining whether third data is swap-in by copying or swap-in by moving, according to a write frequency included in the data characteristics of the third data.