VIRTUAL REAL MEMORY EXPORTATION FOR LOGICAL PARTITIONS

• US 20090307458A1
• Filed: 06/09/2008
• Published: 12/10/2009
• Est. Priority Date: 06/09/2008
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Rosas, Morgan Jeffrey, Pafumi, James A., Vallabhaneni, Vasu, Nogueras, Jorge Rafael
• Granted Patent: US 8,225,068 B2
• Time in Patent Office: Days
• US Class Current: 711/173
• CPC Class Codes: G06F 12/0615 Address space extension

Abstract

A computer implemented method, apparatus, and program product for extending virtual memory associated with logical partitions. A hosting partition receives a paging request from a logical partition on a logically partitioned data processing. The hosting partition identifies a location of the physical memory space on a remote computing device assigned to the logical partition and sends an extended virtual memory paging request to an extended virtual memory manager located on the remote computing device using a network connection. The extended virtual memory paging request comprises the instructions for the memory page-in or the memory page-out and the location of the physical memory space on the remote computing device that is being paged-in or paged-out. The extended virtual memory manager performs a page-in operation or a page-out operation in accordance with the instructions for the memory page-in or memory page-out.

Claims

1. A computer implemented method of extending virtual memory associated with logical partitions, the computer implemented method comprising:

receiving a paging request from an extended virtual memory logical partition on a logically partitioned data processing system, wherein the extended virtual memory logical partition is assigned to physical memory space on the remote computing device, and wherein the paging request comprises instructions for a memory page-in or a memory page-out to the physical memory space assigned to the extended virtual memory logical partition;

identifying a location of the physical memory space on the remote computing device assigned to the extended virtual memory logical partition, by a hosting partition located on the logically partitioned data processing system; and

sending an extended virtual memory paging request from the hosting partition to an extended virtual memory manager located on the remote computing device using a network connection, wherein the extended virtual memory paging request comprises the instructions for the memory page-in or the memory page-out and the location of the physical memory space on the remote computing device that is being paged-in or paged-out, and wherein the extended virtual memory manager performs a page-in operation or a page-out operation on the physical memory space assigned to the extended virtual memory logical partition in accordance with the instructions for the memory page-in or memory page-out.

2. The computer implemented method of claim 1 further comprising:

creating a new logical partition in the plurality of logical partitions;

identifying available physical memory space on the remote computing device; and

assigning the available physical memory space on the remote computing device to the new logical partition on the logically partitioned data processing system.

3. The computer implemented method of claim 1 wherein the physical memory space on the remote computing device is a set of physical memory frames on a hard disk located remotely to the logically partitioned data processing system.

4. The computer implemented method of claim 1 wherein the paging request is a memory page-in request and wherein the instructions comprises an identification of a set of bits to be copied into main memory on the logically partitioned data processing system.

5. The computer implemented method of claim 1 wherein the paging request is a memory page-out request and wherein the instructions comprises an identification of a set of bits to be copied from main memory and into a set of physical memory frames on a hard disk on the logically partitioned data processing system.

6. The computer implemented method of claim 1 wherein the paging request comprises a tag, wherein the tag identifies the paging request as a request from a logical partition assigned to utilize physical memory space on a remote data storage device that is accessible over a network connection.

7. The computer implemented method of claim 1 further comprising:

responsive to identifying an extended virtual memory tag in the memory page-in or memory page-out request, accessing networking components and establishing a network connection with the remote computing device.

8. A computer program product for extending virtual memory associated with logical partitions, the computer program product comprising:

a computer usable medium having computer usable program code embodied therewith, the computer usable program code comprising;

computer usable program code configured to receive a paging request from an extended virtual memory logical partition on a logically partitioned data processing system, wherein the extended virtual memory logical partition is assigned to physical memory space on the remote computing device, and wherein the paging request comprises instructions for a memory page-in or a memory page-out to the physical memory space assigned to the extended virtual memory logical partition;

computer usable program code configured to identify a location of the physical memory space on the remote computing device assigned to the extended virtual memory logical partition, by a hosting partition located on the logically partitioned data processing system; and

computer usable program code configured to send an extended virtual memory paging request from the hosting partition to an extended virtual memory manager located on the remote computing device using a network connection, wherein the extended virtual memory paging request comprises the instructions for the memory page-in or the memory page-out and the location of the physical memory space on the remote computing device that is being paged-in or paged-out, and wherein the extended virtual memory manager performs a page-in operation or a page-out operation on the physical memory space assigned to the extended virtual memory logical partition in accordance with the instructions for the memory page-in or memory page-out.

9. The computer program product of claim 8 further comprising:

computer usable program code configured to creating a new logical partition in the plurality of logical partitions;

computer usable program code configured to identifying available physical memory space on the remote computing device; and

computer usable program code configured to assigning the available physical memory space on the remote computing device to the new logical partition on the logically partitioned data processing system.

10. The computer program product of claim 8 wherein the physical memory space on the remote computing device is a set of physical memory frames on a hard disk located remotely to the logically partitioned data processing system.

11. The computer program product of claim 8 wherein the paging request comprises a tag, wherein the tag identifies the paging request as a request from a logical partition assigned to utilize physical memory space on a remote data storage device that is accessible over a network connection.

12. The computer program product of claim 8 further comprising:

computer usable program code configured to identify an extended virtual memory tag in the paging request and access networking components and establishing a network connection with the remote computing device.

13. An apparatus comprising:

a bus system;

a communications system coupled to the bus system;

a memory connected to the bus system, wherein the memory includes computer usable program code; and

a processing unit coupled to the bus system, wherein the processing unit executes the computer usable program code to receive a paging request from an extended virtual memory logical partition on a logically partitioned data processing system, wherein the extended virtual memory logical partition is assigned to physical memory space on the remote computing device, and wherein the paging request comprises instructions for a memory page-in or a memory page-out to the physical memory space assigned to the extended virtual memory logical partition;

identify a location of the physical memory space on the remote computing device assigned to the extended virtual memory logical partition, by a hosting partition located on the logically partitioned data processing system; and

send an extended virtual memory paging request from the hosting partition to an extended virtual memory manager located on the remote computing device using a network connection, wherein the extended virtual memory paging request comprises the instructions for the memory page-in or the memory page-out and the location of the physical memory space on the remote computing device that is being paged-in or paged-out, and wherein the extended virtual memory manager performs a page-in operation or a page-out operation on the physical memory space assigned to the extended virtual memory logical partition in accordance with the instructions for the memory page-in or memory page-out.

14. The apparatus of claim 13 wherein the processor unit further executes the computer usable program code to create a new logical partition in the plurality of logical partitions;

identify available physical memory space on the remote computing device; and

assign the available physical memory space on the remote computing device to the new logical partition on the logically partitioned data processing system.

15. The apparatus of claim 13 wherein the physical memory space on the remote computing device is a set of physical memory frames on a hard disk located remotely to the logically partitioned data processing system.

16. The apparatus of claim 13 wherein the paging request comprises a tag, wherein the tag identifies the paging request as a request from a logical partition assigned to utilize physical memory space on a remote data storage device that is accessible over a network connection.

17. A data processing system comprising:

a logical partition on a logically partitioned data processing system, wherein the logical partition is assigned to utilize physical memory space located on a remote data storage device;

a hypervisor, wherein the hypervisor sends a page-in or a page-out request to a hosting partition on the logically partitioned data processing system in response to receiving a paging request from the logical partition, wherein the paging request comprises instructions for a memory page-in or a memory page-out to the physical memory space assigned to the extended virtual memory logical partition;

the hosting partition, wherein the hosting partition identifies a location of the physical memory space on the remote computing device assigned to the extended virtual memory logical partition, by a hosting partition located on the logically partitioned data processing system; and

sends an extended virtual memory paging request from the hosting partition to an extended virtual memory manager located on the remote computing device using a network connection, wherein the extended virtual memory paging request comprises the instructions for the memory page-in or the memory page-out and the location of the physical memory space on the remote computing device that is being paged-in or paged-out, and wherein the extended virtual memory manager performs a page-in operation or a page-out operation on the physical memory space assigned to the extended virtual memory logical partition in accordance with the instructions for the memory page-in or memory page-out.

18. The data processing system of claim 17 further comprising:

a listening module on the extended virtual real memory manager on the remote computing device, wherein the listening module listens for page-in requests and page-out requests received from the logically partitioned data processing system over the network connection.

19. The data processing system of claim 17 wherein the physical memory space on the remote computing device is a set of physical memory frames on a hard disk located remotely to the logically partitioned data processing system.

20. The data processing system of claim 17 wherein the paging request comprises a tag, wherein the tag identifies the paging request as a request from a logical partition assigned to utilize physical memory space on a remote data storage device that is accessible over a network connection.