# US 12,217,089 B2 · Identifying memory devices for swapping virtual machine memory pages > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,089 B2 - Document ID: US12217089B2 - Status: Granted - Kind: B2 - Application number: 17/542,816 - Filed: 2021-12-06 - Published: 2022-03-24 - Granted: 2025-02-04 - Earliest claimed: 2014-05-20 - Assignees: Red Hat Israel, Ltd. - Applicants: Red Hat Israel, Ltd. - Inventors: Michael Tsirkin; Andrea Arcangeli - Web page: https://patentgrep.com/patent/US12217089B2 ## CPC - G06F 9/5016: {the resource being the memory} - G06F 9/455: Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines - G06F 9/45558: {Hypervisor-specific management and integration aspects} - G06F 9/50: Allocation of resources, e.g. of the central processing unit [CPU] - G06F 2009/4557: {Distribution of virtual machine instances; Migration and load balancing} - G06F 2009/45583: {Memory management, e.g. access or allocation} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Systems and methods for identifying memory devices for swapping virtual machine memory pages. An example method may comprise: identifying, by a processing device, a workload type associated with a workload being executed by a computer system; identifying a memory device associated with the workload type; evaluating a memory pressure metric reflecting a period of time during which an application being executed by the computer system has been blocked by a memory allocation operation; and responsive to determining that the memory pressure metric exceeds a threshold value, allocating a memory block on the identified memory device. ## Claims ### Claim 1 A method, comprising: retrieving, by a computing system comprising one or more computing devices from a data structure mapping a plurality of respective workload types to a plurality of corresponding memory device types associated with a plurality of corresponding transformation functions, a record mapping a workload type associated with an application, wherein the workload type reflects a classification of the application based on a type of data being consumed by the application, to a memory device type that is designated for storing transformed memory pages that are transformed by a transformation function associated with the workload type; subsequently allocating, based at least in part on the record, a memory block on a memory device having the memory device type that is designated for storing transformed memory pages that are transformed by the transformation function, wherein the memory device comprises a backing store for swapping one or more transformed memory pages that are transformed by the transformation function; and swapping a memory page utilized by the application associated with the workload type with the memory block, wherein the memory page is stored in the memory block as a first transformed memory page that is transformed by the transformation function. ### Claim 2 (depends on 1) The method of claim 1, wherein the memory device is provided by one of: a file or a raw storage device. ### Claim 3 (depends on 1) The method of claim 1, wherein the memory device is provided by one of: a compressed storage device, an encrypted storage device, or a huge page device. ### Claim 4 (depends on 1) The method of claim 1, further comprising: identifying an uncompressed memory device responsive to determining that the workload type is associated with at least one of: video stream data or audio stream data. ### Claim 5 (depends on 1) The method of claim 1, further comprising: identifying a compressed memory device responsive to determining that the workload type is associated with uncompressed data. ### Claim 6 (depends on 1) The method of claim 1, further comprising: identifying an encrypted memory device responsive to determining that the workload type is associated with security-sensitive data. ### Claim 7 (depends on 1) The method of claim 1, further comprising: identifying a huge page memory device responsive to determining that the workload type is associated with huge page memory pages. ### Claim 8 (depends on 1) The method of claim 1, further comprising causing, by the computing system responsive to determining that a first host device does not support a memory device having the memory device type, the application to be migrated to a second host device that is different from the first host device. ### Claim 9 A system comprising: a memory; and a processor, coupled to the memory, to: retrieve, from a data structure mapping a plurality of respective workload types to a plurality of corresponding memory device types associated with a plurality of corresponding transformation functions, a record mapping a workload type associated with an application, wherein the workload type reflects a classification of the application based on a type of data being consumed by the application, to a memory device type that is designated for storing transformed memory pages that are transformed by a transformation function associated with the workload type; subsequently allocate, based at least in part on the record, a memory block on a memory device having the memory device type that is designated for storing transformed memory pages that are transformed by the transformation function, wherein the memory device comprises a backing store for swapping one or more transformed memory pages that are transformed by the transformation function; and swap a memory page utilized by the application associated with the workload type with the memory block, wherein the memory page is stored in the memory block as a first transformed memory page that is transformed by the transformation function. ### Claim 10 (depends on 9) The system of claim 9, wherein the memory device is provided by one of: a compressed storage device, an encrypted storage device, or a huge page device. ### Claim 11 (depends on 9) The system of claim 9, wherein the processor is further to: identify an uncompressed memory device responsive to determining that the workload type is associated with at least one of: video stream data or audio stream data. ### Claim 12 (depends on 9) The system of claim 9, wherein the processor is further to: identify a compressed memory device responsive to determining that the workload type is associated with uncompressed data. ### Claim 13 (depends on 9) The system of claim 9, wherein the processor is further to: identify an encrypted memory device responsive to determining that the workload type is associated with security-sensitive data. ### Claim 14 (depends on 9) The system of claim 9, wherein the processor is further to cause, responsive to determining that a first host device does not support a memory device having the memory device type, the application to be migrated to a second host device that is different from the first host device. ### Claim 15 A computer-readable non-transitory storage medium comprising executable instructions that, when executed by a processing device, cause the processing device to perform operations comprising: retrieve, from a data structure mapping a plurality of respective workload types to a plurality of corresponding memory device types associated with a plurality of corresponding transformation functions, a record mapping a workload type associated with an application, wherein the workload type reflects a classification of the application based on a type of data being consumed by the application to a memory device type that is designated for storing transformed memory pages that are transformed by a transformation function associated with the workload type; subsequently allocate, based at least in part on the record, a memory block on a memory device having the memory device type that is designated for storing transformed memory pages that are transformed by the transformation function, wherein the memory device comprises a backing store for swapping one or more transformed memory pages that are transformed by the transformation function; and swap a memory page utilized by the application associated with the workload type with the memory block, wherein the memory page is stored in the memory block as a first transformed memory page that is transformed by the transformation function. ### Claim 16 (depends on 15) The computer-readable non-transitory storage medium of claim 15, wherein the memory device is provided by one of: a file or a raw storage device. ### Claim 17 (depends on 15) The computer-readable non-transitory storage medium of claim 15, further comprising executable instructions to cause the processing device to: identify an uncompressed memory device responsive to determining that the workload type is associated with at least one of: video stream data or audio stream data. ### Claim 18 (depends on 15) The computer-readable non-transitory storage medium of claim 15, further comprising executable instructions to cause the processing device to: identify a compressed memory device responsive to determining that the workload type is associated with uncompressed data. ### Claim 19 (depends on 15) The computer-readable non-transitory storage medium of claim 15, further comprising executable instructions to cause the processing device to: identify an encrypted memory device responsive to determining that the workload type is associated with security-sensitive data. ### Claim 20 (depends on 15) The computer-readable non-transitory storage medium of claim 15, further comprising executable instructions to cause the processing device to: cause, responsive to determining that a first host device does not support a memory device having the memory device type, the application to be migrated to a second host device that is different from the first host device.