Memory management apparatus, memory management method and non-transitory computer readable storage medium

A memory management apparatus including:

• a processor;
• and
• a memory, wherein the processor executes:
• relating virtual region identification information for identifying a region in the memory to be allocated for a program executed in a virtualized environment to actual region identification information for identifying a region in the memory to be allocated for a virtualized environment where the program is executed in each virtualized environment so as to manage these information;
• determining whether the actual region identification information is allocated for a plurality of virtualized environments in an overlapped manner;
• managing, when determining that the actual region identification information is allocated for the plurality of virtualized environments in the overlapped manner, overlap information representing overlap with the overlap information being related to the actual region identification information;
• and
• reading, when a virtualized environment as a switching source to which execution time is allocated is switched into a virtualized environment as a switching target, the actual region identification information allocated for the virtualized environment of the switching target, determining whether the read actual region identification information is allocated for the plurality of virtualized environments in the overlapped manner with reference to the overlap information, and setting actual region identification information in the read actual region identification information determined as being allocated in the overlap manner as a target for a TLB process.

A memory management method, comprising:

• relating virtual region identification information for identifying a region in the memory to be allocated for a program executed in a virtualized environment to actual region identification information for identifying a region in the memory to be allocated for a virtualized environment where the program is executed in each virtualized environment so as to manage these information;
• determining whether the actual region identification information is allocated for a plurality of virtualized environments in an overlapped manner;
• managing, when determining that the actual region identification information is allocated for the plurality of virtualized environments in the overlapped manner, overlap information representing overlap with the overlap information being related to the actual region identification information;
• and
• reading, when a virtualized environment as a switching source to which execution time is allocated is switched into a virtualized environment as a switching target, the actual region identification information allocated for the virtualized environment of the switching target, determining whether the read actual region identification information is allocated for the plurality of virtualized environments in the overlapped manner with reference to the overlap information, and setting actual region identification information in the read actual region identification information determined as being allocated in the overlap manner as a target for a TLB process.

A non-transitory computer readable storage medium having stored therein a memory management program causing a computer to execute a process comprising:

• relating virtual region identification information for identifying a region in the memory to be allocated for a program executed in a virtualized environment to actual region identification information for identifying a region in the memory to be allocated for a virtualized environment where the program is executed in each virtualized environment so as to manage these information;
• determining whether the actual region identification information is allocated for a plurality of virtualized environments in an overlapped manner;
• managing, when determining that the actual region identification information is allocated for the plurality of virtualized environments in the overlapped manner, overlap information representing overlap with the overlap information being related to the actual region identification information;
• and
• reading, when a virtualized environment as a switching source to which execution time is allocated is switched into a virtualized environment as a switching target, the actual region identification information allocated for the virtualized environment of the switching target, determining whether the read actual region identification information is allocated for the plurality of virtualized environments in the overlapped manner with reference to the overlap information, and setting actual region identification information in the read actual region identification information determined as being allocated in the overlap manner as a target for a TLB process.