US 11,635,919 B1 · Safe sharing of hot and cold memory pages

Abstract

A computing device including executable processes may determine that a future likelihood of access for virtual memory pages of an executable process are below a threshold likelihood of access based on an execution status of the executable process or a tracking of memory accesses to the virtual memory pages of the executable process. Responsive to this determination, memory pages found to store contents matching that of memory pages mapped to other processes may be unmapped from the process and released for reuse by the computing device. The virtual memory pages may then be marked as being shared with the similar memory pages mapped to the other processes. At a later time, the memory pages of the process may be configured to be non-shared, the configuring including either copying respective shared pages to non-shared pages or enabling a processor exception on access to the memory pages.

Claims20

Dependent claims

A system, comprising:

one or more processors;
and
a memory storing program instructions that, when executed on the one or more processors, implement a memory manager configured to:
determine that a future likelihood of access for a virtual memory page of a virtual memory space of an executable process is below a threshold likelihood of access, wherein the determining is based at least in part on an execution status of the executable process or a tracking of memory accesses to the virtual memory page of the executable process to predict respective future likelihoods of access;
and
responsive to the determining:
remap the virtual memory page from a non-shared physical memory page of a computing device to a shared physical memory page mapped to another executable process that comprises another virtual memory space different from the virtual memory space of the executable process, wherein data of the shared physical memory page, which is mapped to the virtual memory page as a result of the remapping matches data of the non-shared physical memory page;
and
configure the executable process to generate a processor exception on an access to the virtual memory page.

6 more elements

One or more non-transitory computer-accessible storage media storing program instructions that when executed on or across one or more computing devices cause the one or more computing devices to perform:

determining that a future likelihood of access for a virtual memory page of an executable process is below a threshold likelihood of access, and responsive to the determining:
remapping the virtual memory page from a non-shared physical memory page of a computing device to a shared physical memory page mapped to another executable process that comprises another virtual memory space different from the virtual memory space of the executable process, wherein data of the shared physical memory page, which is mapped to the virtual memory page as a result of the remapping matches data of the non-shared physical memory page.

Dependencies are inferred from the claim text.

Safe sharing of hot and cold memory pages

Life of this patent

Safe sharing of hot and cold memory pages

Life of this patent

Abstract

Claims20