Online classification of memory pages based on activity level represented by one or more bits
US9032398B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2010 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | May 8, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Activity level of memory pages is classified in virtual machine environment, so that processes such as live VM migration and checkpointing, among others, can be carried out more efficiently. The method includes the steps of scanning page table entries of hypervisor-managed page tables continuously over repeating scan periods to determine whether memory pages have been accessed or not, and for each memory page, determining an activity level of the memory page based on whether the memory page has been accessed or not since a prior scan and storing the activity level of the memory page. The activity level of the memory page may be represented by one or more bits of its page table entry and may be classified as having at least two states ranging from hot to cold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.