Information processing apparatus, control circuit, and control method

A control circuit, comprising:

• a first counter that counts, among blocks each including a plurality of storage areas included in a storage device, number of transfer candidate blocks including the storage areas in which written data is invalidated;
• a second counter that counts, among the blocks, number of reserve blocks in which no data is written in the respective storage areas;
• a determination unit that determines whether transfer processing is to be started in which data is transferred from a transfer candidate block to a reserve block, in accordance with a result of comparing a count value of the first counter with a count value of the second counter;
• and
• a transfer unit that transfers only valid data among data written in the respective storage areas of the transfer candidate block to the reserve block when the determination unit determines that the transfer processing is to be started.

A computer-readable storage medium having stored therein a control program that causes a computer to execute a process comprising:

• counting, among blocks each including a plurality of storage areas included in a storage device, number of transfer candidate blocks including the storage areas in which written data is invalidated;
• counting, among the blocks, number of reserve blocks in which no data is written in the respective storage areas;
• determining whether transfer processing is to be started in which data is transferred from a transfer candidate block to a reserve block, in accordance with a result of comparing the number of transfer candidate blocks with the number of reserve blocks;
• and
• transferring only valid data among data written in the respective storage areas of the transfer candidate block to the reserve block when it is determined that the transfer processing is to be started.

A control method that is performed by an information processing apparatus, the control method comprising:

• counting, among blocks each including a plurality of storage areas included in a storage device, number of transfer candidate blocks including the storage areas in which written data is invalidated;
• counting, among the blocks, number of reserve blocks in which no data is written in the respective storage areas;
• determining whether transfer processing is to be started in which data is transferred from a transfer candidate block to a reserve block, in accordance with a result of comparing the number of transfer candidate blocks with the number of reserve blocks;
• and
• transferring only valid data among data written in the respective storage areas of the transfer candidate block to the reserve block when it is determined that the transfer processing is to be started.