Memory controller, memory system, information processing system, memory control method, and program

A memory system comprising:

• a memory;
• a replacement management information buffer configured to hold part of replacement management information for managing a relationship between a predetermined data area of the memory and a replacement area corresponding to the data area in a case in which the replacement management information is stored in the memory;
• and
• a replacement processing unit configured, in a case in which replacement has occurred in the memory for data related to an access command from a host computer to the memory, to cause the replacement management information buffer to hold the replacement management information of a portion of the data for which the replacement has occurred.

An information processing system comprising:

• a memory;
• a host computer configured to issue an access command to the memory;
• a replacement management information buffer configured to hold part of replacement management information for managing a relationship between a predetermined data area of the memory and a replacement area corresponding to the data area in a case in which the replacement management information is stored in the memory;
• and
• a replacement processing unit configured, in a case in which replacement has occurred in the memory for data related to an access command from the host computer to the memory, to cause the replacement management information buffer to hold the replacement management information of a portion of the data for which the replacement has occurred.

A memory control method comprising:

• in a case in which replacement management information for managing a relationship between a predetermined data area of a memory and a replacement area corresponding to the data area is stored in the memory,
• a procedure in which, in a case in which replacement has not occurred in the memory for data related to an access command from a host computer to the memory, a memory controller performs control such that access is made to the memory using an address of the access command;
• and
• a procedure in which, in a case in which the replacement has occurred for the data related to the access command, the memory controller performs control such that a replacement management information buffer of the memory controller is caused to hold the replacement management information of a portion of the data for which the replacement has occurred, the address of the access command is converted into an address of the replacement area in accordance with the replacement management information held by the replacement management information buffer, and access is made to the memory using a result of the conversion.

A program causing a computer of a memory controller to execute:

• in a case in which replacement management information for managing a relationship between a predetermined data area of a memory and a replacement area corresponding to the data area is stored in the memory,
• a control procedure in which, in a case in which replacement has not occurred in the memory for data related to an access command from a host computer to the memory, access is made to the memory using an address of the access command;
• and
• a control procedure in which, in a case in which the replacement has occurred for the data related to the access command, a replacement management information buffer of the memory controller is caused to hold the replacement management information of a portion of the data for which the replacement has occurred, the address of the access command is converted into an address of the replacement area in accordance with the replacement management information held by the replacement management information buffer, and access is made to the memory using a result of the conversion.