International Business Machines Corporation

Neil William Leedham

Andrew Wright

David J Harman

Kim P Walsh

Stephen John Burghard

Matthew N Sunley

Mark Andrew Woolley

Sean Cawood

Andy Wright

Adam P Coulthard

Neil Kenneth Johnston

Joshua Morris

Adam G Giounas

A system and technique are provided for providing a service address space. The system includes a service co-processor provided with a service address space. The service co-processor is attached to a main processor where the main processor is provided with a main address space. The service co-processor creates and maintains an independent copy of the main address space in the form of the service address space. The service co-processor receives from the main processor a command packet, determines a clock value for initiating a service function designated by the command packet, and updates the service address space until reaching the clock value. The service co-processor then performs the service function at the clock value.

Providing service address space for diagnostics collection

A computer-implemented method, a computer system, and a computer program product for data storage alteration monitoring is provided. The present invention may include, obtaining a page record, wherein the page record includes, for an event monitor having an associated target memory address to be monitored for changes, an entry identifying an associated page of a secondary data storage containing the associated target memory address. The present invention may also include, responsive to identifying a first event monitor having an associated first target memory address to be monitored for changes, analyzing the obtained page record to identify a first page containing the first target memory address. The present invention may further include, controlling enablement of the first event monitor based on whether the first page, identified in the analyzed page record, is loaded into a physical main memory of the computer system.

Storage alteration monitoring

A method, computer system, and computer program product for operating a computer system to carry out a data dump of a data image of memory contents. Computer operations are temporarily suspended to service the dump request in order to dump the volatile memory contents required for the data image and to generate a record of the non-volatile memory pages which need to be dumped. Computer operations are then resumed under supervision of a monitoring process which screens access requests to the non-volatile memory against the dump record. A request relating to a page contained in the dump record is acted upon by writing the contents of that page to the dump storage space, so the page contents is dumped before it is modified. The dump record in continually updated to keep track of what is still outstanding to complete the dump until such time as the dump is complete.

Virtual address space dump in a computer system

A method includes providing a service co-processor with a service address space attached to a main processor. The main processor is provided with a main address space. The service co-processor updates the service address space to create and maintain an independent copy of the main address space. The service co-processor receives a system dump request from the main processor, initiates a system dump, and responsive to initiating the system dump, ceases updating the service address space. The service co-processor, upon completion of the system dump, resets the service address space.

Arrangements described herein relate to performing diagnostic tracing of an executing application. A trace entry in trace data can be identified, the trace entry comprising a pointer that refers to a memory address. Whether a value that is, or has been, stored at the memory address is an erroneous value can be determined. Responsive to determining that the value that is, or has been, stored at the memory address is an erroneous value, the pointer can be indicated as being a suspicious value.

Performing diagnostic tracing of an executing application to identify suspicious pointer values

Technical solutions are described for identifying false positive tests. An example method includes receiving an input identifying a defect in a portion of a product code. The method also includes identifying a first automated test that is associated with the portion of the product code. The method also includes lowering a first test confidence value that is associated with the first automated test by a predetermined amount in response to the first automated test being a passing test. The method also includes marking the first automated test as a false positive test.

Identifying false positive automated tests

A system and technique are provided for providing a service address space. The system includes a service co-processor provided with a service address space. The service co-processor is attached to a main processor where the main processor is provided with a main address space. The service co-processor creates and maintains an independent copy of the main address space in the form of the service address space. The service co-processor updates the service address space with storage delta packets received from the main processor, and the service co-processor performs diagnostic services based on command packets received from the main processor.

A method and technique are provided for providing a service address space. The method includes providing a service co-processor with a service address space attached to a main processor. The main processor is provided with a main address space. Instructions that modify the main address space are intercepted, storage delta packets are generated based on intercepted instructions, and the storage delta packets are sent to a service co-processor maintaining a service address space.

A system and technique are provided for providing a service address space. The system includes a service co-processor provided with a service address space. The service co-processor is attached to a main processor wherein the main processor is provided with a main address space. The service address space and the main address space include a full range of memory available to the respective service-co-processor and the main processor. The service co-processor creates and maintains an independent copy of the main address space in the form of the service address space. The service co-processor has a storage update receiving component for updating the service address space by receiving storage delta packets from the main processor and applying these to the service address space.

A method and technique are provided for providing a service address space. The method includes providing a service co-processor with a service address space attached to a main processor. The main processor is provided with a main address space, and the service address space and the main address space include a full range of memory available to the respective service-co-processor and the main processor. The service co-processor creates and maintains an independent copy of the main address space in the form of the service address space. The service address space is updated by receiving storage delta packets from the main processor and applying the storage delta packets to the service address space.

Data fields within a trace data set are interpreted using data field declarations of the data fields that each specify a data type definition of a respective data field. A data value of an interpreted data field is compared with the data type definition specified within a respective data field declaration for the interpreted data field within the trace date set. Based upon the comparison, a determination is made that the respective interpreted data field contains a data value that violates the data type definition specified within the respective data field declaration.

Trace value correlation with data field declarations

A method and system are provided for providing a service address space for diagnostics collection. The system includes: a service co-processor attached to a main processor, wherein the service co-processor maintains an independent copy of the main processor's address space in the form of a service address space; and a storage update receiving component for updating the service address space by receiving storage update packets from the main processor and applying these to the service address space. An instruction pipe may be provided between the main processor and the service co-processor. The main processor may include: a service delegation component for delegating collection of diagnostic data to the co-processor by sending a collection command from the main processor to the service co-processor for collection of data from the service address space.

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Bursledon, United Kingdom

Neil William Leedham