The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 2009
Filed:
Jun. 30, 2004
Gehad Galal, Rancho Cordova, CA (US);
Randolph Campbell, Folsom, CA (US);
Gehad Galal, Rancho Cordova, CA (US);
Randolph Campbell, Folsom, CA (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
Method for selecting a virtualization algorithm to virtualize a context change. An exit-enter time (EET) to exit and enter a context and a save-restore time (SRT) to save and restore a machine state are calculated. A selective algorithm that selectively saves and restores the machine state when there is a change of context is executed. Statistics are accumulated on an expected value for EET overhead plus an expected value for SRT overhead while executing the selective algorithm. A cost of the selective algorithm is computed as the expected value for EET overhead plus the expected value for SRT overhead. The cost of the selective algorithm is compared to two times SRT which is the cost of an unconditional algorithm that always saves and restores the machine state on context changes. One of the selective algorithm or the unconditional algorithm having the least cost is selected as the virtualization algorithm.