Memory migration and page fault avoidance
AssigneeGoogle Inc.
InventorsPrashanth Prakash, Jerome Charles Jean Glisse
Life of this patent
Estimating the term…
Abstract
Accessing information associated with a virtual memory address by receiving a virtual memory address, translating the virtual memory address into a nominal physical memory address, receiving the nominal physical memory address at a memory migrator, and using the memory migrator to determine an old physical memory address corresponding to the nominal physical memory address and access the information at the old physical memory address or a new physical memory address. The accessing operation may be performed as part of migrating the information from an old physical memory location corresponding the old physical memory address to a new physical memory location corresponding to the new physical memory address.
Claims15
A method for accessing information associated with a virtual memory address comprising:
- receiving a virtual memory address;
- translating the virtual memory address into a nominal physical memory address;
- receiving the nominal physical memory address at a memory migrator;
- and
- using the memory migrator to determine an old physical memory address corresponding to the nominal physical memory address by direct association of the nominal physical memory address with the old physical memory address and to access the information at the old physical memory address.
A system for accessing information associated with a virtual memory address comprising:
- one or more processor cores;
- at least one memory management unit for receiving a virtual memory address and translating the virtual memory address into a nominal physical memory address;
- and
- a memory migrator for receiving the nominal physical memory address, determining an old physical memory address corresponding to the nominal physical memory address by direct association of the nominal physical memory address with the old physical memory address, and accessing the information at the old physical memory address.
A method for performing migration of information associated with a virtual memory address from storage in an old physical memory location corresponding to an old physical memory address to a new physical memory location corresponding to a new physical memory address comprising:
- revising a page table cross-referencing the virtual memory address with the old physical memory address to cross-reference the virtual memory address with a nominal physical memory address;
- copying the information from the old physical memory location to the new physical memory location;
- and
- when accessing the information using the virtual memory address after revising the page table and before copying the information from the old physical memory location to the new physical memory location:
- using the page table to translate the virtual memory address into the nominal physical memory address,
- receiving the nominal physical memory address at a memory migrator,
- using the memory migrator to determine the old physical memory address based on the nominal physical memory address by direct association of the nominal physical memory address with the old physical memory address, and
- accessing the information at the old physical memory address;
- and
- when accessing the information using the virtual memory address after revising the page table and after copying the information from the old physical memory location to the new physical memory location:
- using the page table to translate the virtual memory address into the new physical memory address or using the memory migrator to determine the new physical memory address based on the nominal physical memory address, and
- accessing the information at the new physical memory address.
Dependencies are inferred from the claim text.