Mapping free memory pages maintained by a guest operating system to a shared zero page within a machine frame
US9135038B1 · kind B1 · utility
14Cited by
9References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 10, 2012 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Dec 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2209/5018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Reducing an amount of memory used by a virtual machine. A system includes multiple virtual machines that share common pages of memory. The number of private pages associated with each virtual machine is minimized by ensuring that pages that a guest operating system regards as now free or zeroed are efficiently mapped by the hypervisor to a shared zero page. Upon a hypervisor determining that one or more guest physical frame numbers are assigned to free memory pages, the hypervisor updates mapping data to map the one or more guest physical frame numbers to a shared zero page within the machine frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.