Abstract: Technical solutions are described for reducing page invalidation broadcasts in a computer system. An example method includes pre-allocating a pool of large memory frames by a real storage manager. The method also includes receiving, by a virtual storage manager, an instruction from an application to allocate a memory buffer, where the instruction includes a request to back the memory buffer using large pages. The virtual storage manager, in response to the instruction, allocates the memory buffer from the pre-allocated pool of large memory frames.

Abstract: Technical solutions for reducing page invalidation broadcasts in virtual storage management are described. One general aspect includes a method including allocating, by a storage manager, a virtual memory page to a memory buffer that is used by an application being executed by a multiprocessor system, the virtual memory page being allocated from an address space of the application. The method also includes recording, by a memory management unit, a mapping between the virtual memory page and a physical location in a memory. The method also includes in response to a request, from the application, to deallocate the memory buffer, delaying invalidation of the mapping between the virtual memory page and the physical location in a memory, based on a count of free frames in the address space of the application.

Abstract: Embodiments include methods, systems and computer program products that include executing a begin transaction instruction to begin a transaction comprising a sequence of instructions, wherein the begin transaction instruction indicates that a resource will be accessed by the first processing device. Embodiments also include determining whether it is safe for the first processing device to access the resource. Based on a determination that it is safe for the first processing device to access the resource, embodiments include processing the sequence of instructions of the transaction. Based on a determination that the sequence of instructions of the transaction has been completed, embodiments include executing an end transaction instruction, wherein the end transaction instruction indicates that the first processing device has completed its access of the resource. Based on a determination that it is not safe for the first processing device to access the resource, embodiments include aborting the transaction.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: Embodiments include methods, systems and computer program products that include executing a begin transaction instruction to begin a transaction comprising a sequence of instructions, wherein the begin transaction instruction indicates that a resource will be accessed by the first processing device. Embodiments also include determining whether it is safe for the first processing device to access the resource. Based on a determination that it is safe for the first processing device to access the resource, embodiments include processing the sequence of instructions of the transaction. Based on a determination that the sequence of instructions of the transaction has been completed, embodiments include executing an end transaction instruction, wherein the end transaction instruction indicates that the first processing device has completed its access of the resource. Based on a determination that it is not safe for the first processing device to access the resource, embodiments include aborting the transaction.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A computer system includes memory and a processor configured to manage memory allocation. The processor is configured to execute a memory allocation request to allocate a portion of the memory to an application by determining whether a size of the memory allocation request is less than a first pre-defined size. The processor searches virtual memory for a free allocated memory area corresponding at least to the size of the memory allocation request based on determining that the size of the memory allocation request is less than the first pre-defined size.

Abstract: A monitoring facility that is operable in two modes allowing compatibility with prior existing monitoring facilities. In one mode, in response to encountering a monitored event, an interrupt is generated. In another mode, in response to encountering a monitored event, one or more associated counters are incremented without causing an interrupt.

Abstract: A program (e.g., an operating system) is provided a warning that it has a grace period in which to perform a function, such as cleanup (e.g., complete, stop and/or move a dispatchable unit). The program is being warned, in one example, that it is losing access to its shared resources. For instance, in a virtual environment, a guest program is warned that it is about to lose its central processing unit resources, and therefore, it is to perform a function, such as cleanup.

Abstract: A monitoring facility that is operable in two modes allowing compatibility with prior existing monitoring facilities. In one mode, in response to encountering a monitored event, an interrupt is generated. In another mode, in response to encountering a monitored event, one or more associated counters are incremented without causing an interrupt.

Abstract: One or more registers used to form an address usable in accessing storage are examined to determine if a zero address event has occurred in forming the address. In response to an indication that a zero address event has occurred in address formation, an alert is provided to the program using the address to access storage.

Abstract: A monitoring facility that is operable in two modes allowing compatibility with prior existing monitoring facilities. In one mode, in response to encountering a monitored event, an interrupt is generated. In another mode, in response to encountering a monitored event, one or more associated counters are incremented without causing an interrupt.