International Business Machines Corporation

James H Mulder

Robert R Rogers

Mark S Farrell

Jeffrey Paul Kubala

Charles W Gainey, Jr

Donald W Schmidt

Bernard R Pierce

Elpida Tzortzatos

Timothy John Slegel

Dan F Greiner

Harris M Morgenstern

Robert Miller, Jr

Peter Jeremy Relson

Dieter Wellerdiek

Purvi Sharadchandra Patel

Ralph Sharpe

Girija Varanasi

Patrice Salone

Jonathan D Bradbury

Bruce C Giamei

Robert W StJohn

Christian Jacobi

Damian Leo Osisek

Peter Kenneth Szwed

David Harold Surman

Leslie W Wyman

Louis P Gomes

Steven M Partlow

Greg A Dyck

Robert M Abrams

David Hom

Seth E Lederer

Paula M Spens

Christopher Lee Wood

Mark A Wisniewski

Donald William Schmidt

Charles Gainey Jr

Timothy Slegal

Pierce Bernard

Charles Gainey

An instruction that includes an operation code indicating a diagnose operation is obtained and executed within a computing environment. The executing the instruction includes retrieving selected data from a dump save area to be used to restore machine state and restoring the machine state. The restoring includes storing the selected data in a selected location. One or more storage keys used to protect access to the selected data are restored.

Diagnose instruction to restore machine state and associated storage keys

Detection of alteration of storage keys used to protect memory includes determining whether a storage key alteration event has occurred within a processor of a computing environment. The determining includes checking whether one or more selected fields of a storage key have been updated. The storage key is associated with a block of memory and controls access to the block of memory. Based on the checking indicating that the one or more selected fields of the storage key have been updated, a storage key alteration event has been detected. Based on determining the storage key alteration event has occurred, a notification is provided.

Detection of alteration of storage keys used to protect memory

Interrupt code conversion for efficient computer program recovery. In response to an error being detected while processing instructions of a computer program running on a computer system, the OS receives a first program interrupt code (PIC) and interrupts the computer program. Control of the computer program is passed to a program interrupt handler and the program interrupt handler inspects the first PIC issued as a result of detecting the error. The first PIC is converted to a second PIC wherein the second PIC is associated with another error predicted when subsequent running of the computer program occurs. The second PIC is presented to a recovery routine associated with the computer program and, in response to the detected error, running of the computer program is customized based on the second PIC rather than the first PIC.

Program interrupt code conversion

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.

Reducing page invalidation broadcasts

A method for obtaining data to debug an issue that affects a software application. In an embodiment, the method includes at least one computer processor receiving a request to obtain data associated with an issue that affects an executing software application. The method further includes determining a set of memory spaces utilized by the executing software application and one or more processes supporting the executing software application. The method further includes initiating a dump function to obtain data within the memory spaces of the determined set of memory spaces. The method further includes storing the data related to the dumped set of memory spaces by (i) high-speed capture and aggregation of data to volatile memory and (ii) spooling data within volatile memory to persistent memory for storage.

Aggregating data for debugging software

Testing for pending external interruptions. A Test Pending External Interruption instruction tests for pending external interruptions. The test for pending external interruptions is based on one or more program-specified subclasses, regardless of whether the machine is enabled for those classes of interruption. The instruction provides an indication for those subclasses being tested of whether there are any pending external interruptions for those subclasses.

Test pending external interruption instruction

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.

Reducing page invalidation broadcasts in virtual storage management

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.

Warning track interruption facility

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.

Use of a warning track interruption facility by a program

Growing community of inventors

Poughkeepsie, NY, United States of America

James H Mulder