Information processing apparatus and information processing apparatus control method

A method of controlling an information processing apparatus including a processor having a register and executing processes, and a memory coupled to the processor, the method comprising:

• causing execution by the information processing apparatus of:
• reading attribute information indicating a usage frequency of a register used by a process to be executed as a next process by the processor when the processor switches a process currently being executed;
• saving a value of the register used by the next process to be executed next by the processor to the memory when the usage frequency by the next process of the register indicated by the attribute information is larger than a certain frequency;
• reading owner information indicating a process using the register used by a process to be executed as a next process by the processor when the usage frequency by the next process of the register indicated by the attribute information is larger than the certain frequency;
• and
• restoring a register value saved in the memory to the register when the owner information indicates a process other than the next process to be executed next by the processor.

An information processing apparatus comprising:

• a processor that has a register and executes processes;
• a memory to store attribute information indicating frequency usages of a plurality of registers, and owner information indicating a process using the plurality of registers;
• and
• a register controller that:
• reads from a memory attribute information of a register used by a process to be executed as a next process by the processor from among the plurality of registers when a process currently being executed is switched,
• saves a value of the register to be used by the next process to a memory when a frequency usage of the register indicated by the attribute information is larger than a certain frequency,
• reads from a memory owner information of the register to be used by the next process when the frequency usage of the register indicated by the attribute information is larger than the certain frequency, and
• restores a value of the register saved in the memory to the register when the owner information indicates a process other than the next process.