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:
Jul. 14, 2015
Filed:
Jun. 21, 2011
Jesse P. Arroyo, Rochester, MN (US);
Ellen M. Bauman, Rochester, MN (US);
Timothy R. Block, Rochester, MN (US);
Leonardo Letourneaut, Rochester, MN (US);
Timothy J. Schimke, Stewartville, MN (US);
Jesse P. Arroyo, Rochester, MN (US);
Ellen M. Bauman, Rochester, MN (US);
Timothy R. Block, Rochester, MN (US);
Leonardo Letourneaut, Rochester, MN (US);
Timothy J. Schimke, Stewartville, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method, system and computer program product are provided for implementing memory migration of large system memory pages in a computer system. A large page to be migrated from a current location to a target location is converted into a plurality of smaller subpages for a processor or system page table. The migrated page is divided into first, second and third segments, each segment composed of the smaller subpages and each respective segment changes as each individual subpage is migrated. CPU and I/O accesses to respective subpages of the first segment are directed to corresponding subpages of the target page or new page. I/O accesses to respective subpages of the second segment use a dual write mode targeting corresponding subpages of both the current page and the target page. CPU and I/O accesses to the subpages of the third segment access the corresponding subpages of the current page.