Method, system, and computer program product for migrating data from one real page to another

A method in a data processing system, said method comprising the steps of:

• executing a first routine that accesses a particular virtual address, said virtual address being mapped to a particular real address, wherein said first routine is accessing said real address;
• executing a second routine that initiates a migration of data that is stored in a particular real page, said particular real page including said particular real address;
• migrating said data that is stored in said particular real page to a new real page while said first routine is executing;
• and
• said migration being transparent to said first routine.

A data processing system comprising:

• a real page of data;
• virtual addresses that are associated with real addresses that are included within said real page;
• a page table that includes translations of said virtual addresses to said real addresses;
• executing means for executing a routine that accesses said page table to obtain said translations, said routine utilizing said virtual addresses to access said data stored in said real page;
• while said routine is executing, migration means for migrating said data to a new real page;
• and
• said page table being updated while said routine is executing, wherein said routine utilizes said virtual addresses to access said data stored in said new real page, further wherein said execution of said routine continues while said page table is being updated.

A data processing system comprising:

• a first routine that accesses a particular virtual address, said virtual address being mapped to a particular real address, wherein said first routine is accessing said real address;
• a second routine that initiates a migration of data that is stored in a particular real page, said particular real page including said particular real address;
• said data that is stored in said particular real page being migrated to a new real page while said first routine is executing;
• and
• said migration being transparent to said first routine.

A computer program product in a data processing system, said product comprising:

• instruction means for establishing a real page of data;
• instruction means for generating virtual addresses that are associated with real addresses that are included within said real page;
• instruction means for establishing a page table that includes translations of said virtual addresses to said real addresses;
• instruction means for executing a routine that accesses said page table to obtain said translations, said routine utilizing said virtual addresses to access said data stored in said real page;
• while said routine is executing, instruction means for migrating said data to a new real page;
• and
• instruction means for updating said page table while said routine is executing, wherein said routine utilizes said virtual addresses to access said data stored in said new real page, further wherein said execution of said routine continues while said page table is being updated.

A computer program product in a data processing system, said product comprising:

• instruction means for executing a first routine that accesses a particular virtual address, said virtual address being mapped to a particular real address, wherein said first routine is accessing said real address;
• instruction means for executing a second routine that initiates a migration of data that is stored in a particular real page, said particular real page including said particular real address;
• instruction means for migrating said data that is stored in said particular real page to a new real page while said first routine is executing;
• and
• said migration being transparent to said first routine.