Patents by Inventor Naresh Nayar
Naresh Nayar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20130086581Abstract: Multiple machine state registers are included in a processor core to permit distinction between use of hardware facilities by applications, supervisory threads and the hypervisor. All facilities are initially disabled by the hypervisor when a partition is initialized. When any access is made to a disabled facility, the hypervisor receives an indication of which facility was accessed and sets a corresponding hardware flag in the hypervisor's machine state register. When an application attempts to access a disabled facility, the supervisor managing the operating system image receives an indication of which facility was accessed and sets a corresponding hardware flag in the supervisor's machine state register. The multiple register implementation permits the supervisor to determine whether particular hardware facilities need to have their state saved when an application context swap occurs and the hypervisor can determine which hardware facilities need to have their state saved when a partition swap occurs.Type: ApplicationFiled: October 3, 2011Publication date: April 4, 2013Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Giles R. Frazier, Michael K. Gschwind, Naresh Nayar
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Patent number: 8407515Abstract: A method and apparatus for transparently handling recurring correctable errors and uncorrectable errors in a mirrored memory system prevents costly system shutdowns for correctable memory errors or system failures from uncorrectable memory errors. When a high number of correctable errors are detected for a given memory location, a memory relocation mechanism in the hypervisor moves the data associated with the memory location to an alternate physical memory location transparently to the partition such that the partition has no knowledge that the physical memory actualizing the memory location has been changed. When a correctable error occurs, the memory relocation mechanism uses data from a partner mirrored memory block as a data source for the memory block with the uncorrectable error and then relocates the data to a newly allocated memory block to replace the memory block with the uncorrectable error.Type: GrantFiled: May 6, 2008Date of Patent: March 26, 2013Assignee: International Business Machines CorporationInventors: Peter Joseph Heyrman, Naresh Nayar, Gary Ross Ricard
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Patent number: 8381005Abstract: A method, system and computer-usable medium are disclosed for managing power consumption in information processing systems. Processing resources are successively folded, allowing them to be placed into deeper and deeper power saving states while maintaining the ability to respond to new processing loads without exposing the latency of the deeper power saving states as they are unfolded. Before a deeper power saving state can be used, there must be sufficient processing resources in the prior power saving state to mask the latency of bringing a processing resource out of the deeper power saving state.Type: GrantFiled: December 18, 2009Date of Patent: February 19, 2013Assignee: International Business Machines CorporationInventors: Richard L. Arndt, Naresh Nayar, Freeman L. Rawson, III, Randal C. Swanberg
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Patent number: 8381002Abstract: A mechanism is provided for transparently consolidating resources of logical partitions. Responsive to the existence of the non-folded resource on an originating resource chip, the virtualization mechanism determines whether there is a destination resource chip to either exchange operations of the non-folded resource with a folded resource on the destination chip or migrate operations of the non-folded resource to a non-folded resource on the destination chip. Responsive to the existence of the folded resource on the destination resource chip, the virtualization mechanism transparently exchanges the operations of the non-folded resource from the originating resource chip to the folded resource on the destination resource chip, where the folded resource remains folded on the originating resource chip after the exchange. Responsive to the absence of another non-folded resource on the originating resource chip, the vitalization mechanism places the originating resource chip into a deeper power saving mode.Type: GrantFiled: June 23, 2010Date of Patent: February 19, 2013Assignee: International Business Machines CorporationInventors: Naresh Nayar, Karthick Rajamani, Freeman L. Rawson, III
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Patent number: 8341628Abstract: A mechanism is provided in a logically partitioned data processing system for controlling depth and latency of exit of a virtual processor's idle state. A virtualization layer generates a cede latency setting information (CLSI) data. Responsive to booting a logical partition, the virtualization layer communicates the CLSI data to an operating system (OS) of the logical partition. The OS determines, based on the CLSI data, a particular idle state of a virtual processor under a control of the OS. Responsive to the OS calling the virtualization layer, the OS communicates the particular idle state of the virtual processor to the virtualization layer for assigning the particular idle state and wake-up characteristics to the virtual processor.Type: GrantFiled: December 23, 2009Date of Patent: December 25, 2012Assignee: International Business Machines CorporationInventors: Richard Louis Arndt, Christopher Francois, Naresh Nayar, Karthick Rajamani, Freeman Leigh Rawson, III, Randal Craig Swanberg
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Patent number: 8327083Abstract: Transparent hypervisor pinning of critical memory areas is provided for a shared memory partition data processing system. The transparent hypervisor pinning includes receiving at a hypervisor a hypervisor call initiated by a logical partition to register a logical memory area of the logical partition with the hypervisor. Responsive to this hypervisor call, the hypervisor transparently determines whether the logical memory is a critical memory area for access by the hypervisor. If the logical memory area is a critical memory area, then the hypervisor automatically pins the logical memory area to physical memory of the shared memory partition data processing system, thereby ensuring that the memory area will not be paged-out from physical memory to external storage, and thus ensuring availability of the logic memory area to the hypervisor.Type: GrantFiled: January 6, 2012Date of Patent: December 4, 2012Assignee: International Business Machines CorporationInventors: Stuart Z. Jacobs, David A. Larson, Naresh Nayar, Wade B. Ouren
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Patent number: 8255639Abstract: A method and apparatus for transparently handling recurring correctable errors to prevent costly system shutdowns for correctable memory errors or system failures from uncorrectable memory errors. When a high number of correctable errors are detected for a given memory location, the hypervisor moves the data associated with the memory location to an alternate physical memory location transparently to the partition such that the partition has no knowledge that the physical memory actualizing the memory location has been changed. Similarly, the hypervisor can move direct memory access (DMA) memory locations using an I/O translation table.Type: GrantFiled: May 6, 2008Date of Patent: August 28, 2012Assignee: International Business Machines CorporationInventors: Peter Joseph Heyrman, Naresh Nayar, Gary Ross Ricard
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Publication number: 20120210152Abstract: A mechanism is provided for transparently consolidating resources of logical partitions. Responsive to the existence of the non-folded resource on an originating resource chip, the virtualization mechanism determines whether there is a destination resource chip to either exchange operations of the non-folded resource with a folded resource on the destination chip or migrate operations of the non-folded resource to a non-folded resource on the destination chip. Responsive to the existence of the folded resource on the destination resource chip, the virtualization mechanism transparently exchanges the operations of the non-folded resource from the originating resource chip to the folded resource on the destination resource chip, where the folded resource remains folded on the originating resource chip after the exchange. Responsive to the absence of another non-folded resource on the originating resource chip, the vitalization mechanism places the originating resource chip into a deeper power saving mode.Type: ApplicationFiled: April 26, 2012Publication date: August 16, 2012Applicant: International Business Machines CorporationInventors: Naresh Nayar, Karthik Rajamani, Freeman L. Rawson, III
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Publication number: 20120198202Abstract: A computer implemented method to establish at least one paging partition in a data processing system. The virtualization control point (VCP) reserves up to the subset of physical memory for use in the shared memory pool. The VCP configures at least one logical partition as a shared memory partition. The VCP assigns a paging partition to the shared memory pool. The VCP determines whether a user requests a redundant assignment of the paging partition to the shared memory pool. The VCP assigns a redundant paging partition to the shared memory pool, responsive to a determination that the user requests a redundant assignment. The VCP assigns a paging device to the shared memory pool. The hypervisor may transmit at least one paging request to a virtual asynchronous services interface configured to support a paging device stream.Type: ApplicationFiled: April 12, 2012Publication date: August 2, 2012Applicant: International Business Machines CorporationInventors: Richard L. Arndt, Carol B. Hernandez, Kyle A. Lucke, Timothy R. Marchini, Naresh Nayar, James A. Pafumi
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Publication number: 20120198452Abstract: A mechanism is provided in a logically partitioned data processing system for controlling depth and latency of exit of a virtual processor's idle state. A virtualization layer generates a cede latency setting information (CLSI) data. Responsive to booting a logical partition, the virtualization layer communicates the CLSI data to an operating system (OS) of the logical partition. The OS determines, based on the CLSI data, a particular idle state of a virtual processor under a control of the OS. Responsive to the OS calling the virtualization layer, the OS communicates the particular idle state of the virtual processor to the virtualization layer for assigning the particular idle state and wake-up characteristics to the virtual processor.Type: ApplicationFiled: April 12, 2012Publication date: August 2, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: RICHARD L. ARNDT, NARESH NAYAR, CHRISTOPHER FRANCOIS, KARTHICK RAJAMANI, FREEMAN L. RAWSON, III, RANDAL C. SWANBERG
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Patent number: 8234645Abstract: An apparatus, program product and method support the deallocation of a data structure in a multithreaded computer without requiring the use of computationally expensive semaphores or spin locks. Specifically, access to a data structure is governed by a shared pointer that, when a request is received to deallocate the data structure, is initially set to a value that indicates to any thread that later accesses the pointer that the data structure is not available. In addition, to address any thread that already holds a copy of the shared pointer, and thus is capable of accessing the data structure via the shared pointer after the initiation of the request, all such threads are monitored to determine whether any thread is still using the shared pointer by determining whether any thread is executing program code that is capable of using the shared pointer to access the data structure.Type: GrantFiled: January 8, 2008Date of Patent: July 31, 2012Assignee: International Business Machines CorporationInventors: William Joseph Armstrong, Peter Joseph Heyrman, Naresh Nayar
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Patent number: 8230434Abstract: An entitlement management system for distributing spare CPU processor resources to a plurality of deployment groups operating in a data processing system, the system comprising: a deployment group entitlement component comprising: an allocation component for allocating a plurality of micro-partitions to a deployment group; a determining component for identifying spare CPU processor cycles from a donor micro-partition and distributing the identified spare CPU processor cycles to a requester micro-partition in the deployment group; the determining component further comprises identifying when there are no further spare CPU processor cycles to be donated to any of the micro-partitions in the deployment group and communicating a request to a management entitlement component; and a management entitlement component receiving requests from at least two deployment group entitlement components and identifying if one of the deployment groups has spare CPU processor cycles to donate to a further deployment group and on aType: GrantFiled: September 24, 2007Date of Patent: July 24, 2012Assignee: International Business Machines CorporationInventors: William J. Armstrong, Christopher G. Hales, Naresh Nayar
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Publication number: 20120179932Abstract: A firmware update process for a self-virtualizing IO resource such as an SRIOV adapter is incorporated into a platform firmware update process to systematically update the resource firmware in a manner that is for the most part transparent to the logical partitions sharing the adapter. In particular, resource firmware associated with a self-virtualizing IO resource is bundled with firmware for at least one adjunct partition associated with that self-virtualizing IO resource within a common firmware image so that, upon restart of the adjunct partition to use the updated firmware image, the resource firmware is also updated, with a logical partition that uses the self-virtualizing IO resource maintained in an active state during the restart, and without requiring the self-virtualizing IO resource to be deconfigured from the logical partition.Type: ApplicationFiled: January 11, 2011Publication date: July 12, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: William J. Armstrong, Charles S. Graham, Andrew T. Koch, Kyle A. Lucke, Naresh Nayar, Randal C. Swanberg
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Patent number: 8209692Abstract: An apparatus, program product and method support the deallocation of a data structure in a multithreaded computer without requiring the use of computationally expensive semaphores or spin locks. Specifically, access to a data structure is governed by a shared pointer that, when a request is received to deallocate the data structure, is initially set to a value that indicates to any thread that later accesses the pointer that the data structure is not available. In addition, to address any thread that already holds a copy of the shared pointer, and thus is capable of accessing the data structure via the shared pointer after the initiation of the request, all such threads are monitored to determine whether any thread is still using the shared pointer by determining whether any thread is executing program code that is capable of using the shared pointer to access the data structure.Type: GrantFiled: October 29, 2007Date of Patent: June 26, 2012Assignee: International Business Machines CorporationInventors: William Joseph Armstrong, Peter Joseph Heyrman, Naresh Nayar
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Patent number: 8195867Abstract: Controlled partition shut-down is provided within a shared memory partition data processing system including a shared memory partition, a paging service partition, a hypervisor and a shared memory pool within physical memory. The hypervisor manages access to logical pages within the pool and page-out of pages from the pool to external paging storage via the paging service partition. A respective paging service stream exists between the paging service partition and hypervisor for each shared memory partition, with each stream including a stream state. The control method includes: responsive to a shut-down initiating event, notifying the paging service partition to shut down, and determining whether a shared memory partition is currently active, and if so, signaling the hypervisor to complete paging activity for the active memory partition and waiting for its stream state to enter a suspended or a completed state before automatically shutting down the paging service partition.Type: GrantFiled: March 13, 2009Date of Patent: June 5, 2012Assignee: International Business Machines CorporationInventors: David A. Hepkin, Carol B. Hernandez, Andrew T. Koch, Kyle A. Lucke, Naresh Nayar, Jorge R. Nogueras
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Publication number: 20120110273Abstract: Transparent hypervisor pinning of critical memory areas is provided for a shared memory partition data processing system. The transparent hypervisor pinning includes receiving at a hypervisor a hypervisor call initiated by a logical partition to register a logical memory area of the logical partition with the hypervisor. Responsive to this hypervisor call, the hypervisor transparently determines whether the logical memory is a critical memory area for access by the hypervisor. If the logical memory area is a critical memory area, then the hypervisor automatically pins the logical memory area to physical memory of the shared memory partition data processing system, thereby ensuring that the memory area will not be paged-out from physical memory to external storage, and thus ensuring availability of the logic memory area to the hypervisor.Type: ApplicationFiled: January 6, 2012Publication date: May 3, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Stuart Z. JACOBS, David A. LARSON, Naresh NAYAR, Wade B. OUREN
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Publication number: 20120096293Abstract: A mechanism is provided for directed resource folding for power management. The mechanism receives a set of static platform characteristics and a set of dynamic platform characteristics for a set of resources associated with the data processing system thereby forming characteristic information. The mechanism determines whether one or more conditions have been met for each resource in the set of resources using the characteristic information. Responsive to the one or more conditions being met, the mechanism performs a resource optimization to determine at least one of a first subset of resources in the set of resources to keep active and a second subset of resources in the set of resources to dynamically fold. Based on the resource optimization, the mechanism performs either a virtual resource optimization to optimally schedule the first subset of resources or a physical resource optimization to dynamically fold the second subset of resources.Type: ApplicationFiled: October 19, 2010Publication date: April 19, 2012Applicant: International Business Machines CorporationInventors: Michael S. Floyd, Christopher Francois, Naresh Nayar, Karthick Rajamani, Freeman L. Rawson, III, Randal C. Swanberg, Malcolm S. Ware
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Publication number: 20120079500Abstract: Accounting charges are assigned to workloads by measuring a relative use of computing resources by the workloads, then scaling the results using determined work-rate for the corresponding workload. Usage metrics for the individual resources may be selectable for the resources being measured and the work-rates may be determined from an analytical model or from empirical model that determines work-rates from an indication of processor throughput. Under single workload conditions on a platform, or other suitable conditions, a workload type may be used to select the particular usage metrics applied for the various resources.Type: ApplicationFiled: September 29, 2010Publication date: March 29, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Michael S. Floyd, Christopher Francois, Naresh Nayar, Karthick Rajamani, Freeman Leigh Rawson, III, Randal C. Swanberg
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Patent number: 8140822Abstract: Maintaining data integrity for a logical partition by enabling nonintrusive switching of page tables used during a migration of the logical partition from a source computer system to a target computer system. A first page table stores a plurality of page entries made within a logically partitioned environment. A second page table stores one or more page entries generated during the migration. After migration, the processor page table pointer is switched to point to the first page table. A page entry in the second page table corresponding to a page entry made to the first page table by the logical partition may be invalidated in response to a page table hypervisor call made by the logical partition. In parallel, a plurality of entries generated during the migration of the logical partition in the second page table may be read through and invalidated.Type: GrantFiled: April 16, 2007Date of Patent: March 20, 2012Assignee: International Business Machines CorporationInventors: Stuart Zachary Jacobs, David Anthony Larson, Naresh Nayar, Jonathan Ross Van Niewaal, Kenneth Charles Vossen
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Patent number: 8127086Abstract: Transparent hypervisor pinning of critical memory areas is provided for a shared memory partition data processing system. The transparent hypervisor pinning includes receiving at a hypervisor a hypervisor call initiated by a logical partition to register a logical memory area of the logical partition with the hypervisor. Responsive to this hypervisor call, the hypervisor transparently determines whether the logical memory is a critical memory area for access by the hypervisor. If the logical memory area is a critical memory area, then the hypervisor automatically pins the logical memory area to physical memory of the shared memory partition data processing system, thereby ensuring that the memory area will not be paged-out from physical memory to external storage, and thus ensuring availability of the logic memory area to the hypervisor.Type: GrantFiled: March 13, 2009Date of Patent: February 28, 2012Assignee: International Business Machines CorporationInventors: Stuart Z. Jacobs, David A. Larson, Naresh Nayar, Wade B. Ouren