International Business Machines Corporation

David J Harman

Andrew Wright

Neil William Leedham

Kim P Walsh

Stephen John Burghard

Mark Andrew Woolley

Gary O Whittingham

David E Knibb

Brian Johnson

Alan Clive Robinson

Felicity J Merrison

Nicola J Bennett

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 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

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.

Embodiments of the present invention provide a method, system, and computer program product for qualifying changes to an instruction set in source code. In an embodiment of the invention, a method for quantifying changes to an instruction set in source code can be provided. The method can include receiving text in a code editor as an edit to source code of a computer program querying a data store of code change costs with at least a portion of the edit. The method additionally can include retrieving in response to the query a code change cost associated with the edit. Finally, the method can include displaying in the code editor the retrieved code change cost.

Automated and heuristically managed solution to quantify CPU and path length cost of instructions added, changed or removed by a service team

A method, system, and computer program product are provided for protecting state data of computer system code. The computer system code may be operating system code, subsystem code or application code and the item of state data is not expected to change within the execution of the computer system code. The method includes: creating or modifying an item of state data having a field value and being stored in memory for access by computer system code; registering an item of state data for protection; preserving the field value of the item of state data in a form inaccessible to third party software; validating the field value of the item of state data by comparing a current field value with the preserved field value to determine if the field value has been modified; and, if the field value has been modified, taking appropriate action.

Protection of state data in computer system code

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.

Embodiments of the invention relate to a method, system, and computer program product for validating a data structure, comprising: responsive to identifying a data structure in a first programming language, identifying an equivalent data structure in a second programming language; comparing a data definition of the data structure with a data definition of the equivalent data structure; determining an incompatibility between a compared data definition of the data structure and a compared data definition of the equivalent data structure; and responsive to determining an incompatibility, identifying a rule defining an action to be taken in order to correct the incompatibility.

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Eastleigh, United Kingdom

David J Harman