Patent application number | Description | Published |
20090307707 | SYSTEM AND METHOD FOR DYNAMICALLY ADAPTIVE MUTUAL EXCLUSION IN MULTI-THREADED COMPUTING ENVIRONMENT - A system and associated method for mutually exclusively executing a critical section by a process in a computer system. The critical section accessing a shared resource is controlled by a lock. The method measures a detection time when a lock contention is detected, a wait time representing a duration of wait for the lock at each failed attempt to acquire the lock, and a delay representing a total lapse of time from the detection time till the lock is acquired. The delay is logged and used to calculate an average delay, which is compared with a suspension overhead time of the computer system on which the method is executed to determine whether to spin or to suspend the process while waiting for the lock to be released. | 12-10-2009 |
20090320028 | SYSTEM AND METHOD FOR LOAD-ADAPTIVE MUTUAL EXCLUSION WITH WAITING PROCESS COUNTS - A system and associated method for mutually exclusively executing a critical section by a process in a computer system. The critical section accessing a shared resource is controlled by a lock. The method measures a detection time when a lock contention is detected, a wait time representing a duration of wait for the lock at each failed attempt to acquire the lock, and a delay representing a total lapse of time from the detection time till the lock is acquired. The delay is logged and used to calculate an average delay, which is compared with a suspension overhead time of the computer system to determine whether to spin or to suspend the process while waiting for the lock to be released. The number of processes waiting for the lock and the number of processes suspended are respectively counted to optimize the method. | 12-24-2009 |
20100275260 | Deterministic Serialization of Access to Shared Resource in a Multi-Processor System for code Instructions Accessing Resources in a Non-Deterministic Order - Managing access to resources shared among multiple processes within a computer system. Multiple program instances of an application are almost simultaneously executed on multiple processors for fault tolerance. The replication solution supports the recording and subsequent replay of reservation events granting the shared resources exclusive access rights to the processes, when one program code instruction may request access to a set of shared resources in a non-deterministic order. | 10-28-2010 |
20130174159 | FACILITATING PROCESSING WITHIN COMPUTING ENVIRONMENTS SUPPORTING PAGEABLE GUESTS - Processing within a computing environment that supports pageable guests is facilitated. Processing is facilitated in many ways, including, but not limited to, associating guest and host state information with guest blocks of storage; maintaining the state information in control blocks in host memory; enabling the changing of states; and using the state information in management decisions. In one particular example, the guest state includes an indication of usefulness and importance of memory contents to the guest, and the host state reflects the ease of access to memory contents. The host and guest state information is used in managing memory of the host and/or guests. | 07-04-2013 |
20130246760 | CONDITIONAL IMMEDIATE VALUE LOADING INSTRUCTIONS - A data processor comprising a plurality of registers, and instruction execution circuitry having an associated instruction set, wherein the instruction set includes an instruction specifying at least a mask operand, a register operand and an immediate value operand, and the instruction execution circuitry, in response to an instance of the instruction, determines a Boolean value based on the mask operand and sets a respective one of a plurality of registers specified by the register operand of the instance to a value of the immediate value operand if the Boolean value is true. The instruction execution circuitry, in response to the instance of the instruction, may set the respective one of the plurality of registers specified by the register operand of the instance to zero if the Boolean value is false. | 09-19-2013 |
20140149799 | CREATING AN OPERATING SYSTEM DUMP - Creating an operating system dump. A main memory of a computer system is divided into at least three contiguous memory areas, comprising a primary memory area, a secondary memory area and a data memory area. A first instance of an OS (operating system) is booted into the main memory, a second instance of the operating system is loaded into the secondary memory area using the active first instance of the operating system, execution of the first active instance of the OS is stopped if a critical execution error occurs, and the computer system is re-started using the loaded second instance of the operating system which becomes the active instance of the OS. A dump of the primary memory area is created, and a third instance of the operating system is loaded into the primary memory area. | 05-29-2014 |
20140289729 | FACILITATING PROCESSING WITHIN COMPUTING ENVIRONMENTS SUPPORTING PAGEABLE GUESTS - Processing within a computing environment that supports pageable guests is facilitated. Processing is facilitated in many ways, including, but not limited to, associating guest and host state information with guest blocks of storage; maintaining the state information in control blocks in host memory; enabling the changing of states; and using the state information in management decisions. In one particular example, the guest state includes an indication of usefulness and importance of memory contents to the guest, and the host state reflects the ease of access to memory contents. The host and guest state information is used in managing memory of the host and/or guests. | 09-25-2014 |