International Business Machines Corporation

Steven M Partlow

Elpida Tzortzatos

Harris M Morgenstern

Scott B Tuttle

Robert Miller, Jr

Thomas F Rankin

Joseph Griesemer

Scott Brady Compton

Charles E Mari

Ryan Thomas Rawlins

Andrew C Hicks

Dale E Blue

Alfred F Foster

David A Stilwell

Walter W Otto

David Hom

Christopher G Brooker

Christopher Lee Wood

Duane C Hughes

Peter Grimm Sutton

Peter Jeremy Relson

Christine M Yost

Christian Jacobi

Charles Franklin Webb

James H Mulder

Michael Gary Spiegel

Karl David Schmitz

Peter A Fatzinger

Frank Hemsing

An aspect includes determining, via a processor, context attributes of a storage. Data address translation (DAT) tables are created, via the processor, to map virtual addresses to real addresses within the storage. When detecting, via the processor, that a context attribute of the storage has changed, and the DAT tables are updated based at least in part on the changed context attributes of the storage.

Dynamically joining and splitting dynamic address translation (DAT) tables based on operational context

Systems, methods, and computer-readable media are described for utilizing breakpoint value-based fingerprints of failing regression test cases to determine specific components of a System Under Test (SUT) that are causing a fault such as specific lines of source code. A failing test case from a regression run is selected and fault localization and inverse combinatorics techniques are employed to generate a set of failing test cases around the selected failing test case. A set of test fingerprints corresponding to the set of failing test cases is compared to a set of test fingerprints corresponding to a set of passing test cases to determine breakpoints that are indicated as being encountered during execution of at least one failing test case and that are not encountered during execution of any of the passing test cases. Specific lines of source code that correspond to these breakpoints are then identified as causing the fault.

Fault detection using breakpoint value-based fingerprints of failing regression test cases

Examples of techniques for function modification for software application testing are described herein. An aspect includes, based on a function call to a function by an application under test that is being tested using a test case in a testing environment, determining whether modification of the function is enabled. Another aspect includes, based on determining that modification of the function is enabled, running the function in a modified mode.

Function modification for software application testing

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

A non-limiting example computer-implemented method includes receiving instructions to switch an operational context of a dynamic address translation (DAT) structure to a new operational context. It is determined if context switching has been enabled within the DAT structure. Based on determining that context switching is enabled, it is determined if the new operational context of the DAT structure is different than a current operational context of the DAT structure. It is chosen whether to switch to a full operational context based on the new operational context being different than the current operational context. If the full operational context is used, a full space DAT structure is set up and a private space bit is set to OFF, and if the full operational context is not used, a partial space DAT structure is set up and the private space bit is set to ON.

Private space control within a common address space

A computer-implemented method for switching between a full space and a subspace across multiple address spaces is described. A non-limiting example of the computer-implemented method includes determining, by a processor, that switching between the full space and the subspace is enabled by examining a bit in a control register. The method determines, by the processor, that there is a new context different from an existing context based on the bit in the control register indicating that switching is enabled and switches, by the processor, the context of the multiple spaces based on determining that the new context is different from the existing context.

Access to dynamic address translation across multiple spaces for operational context subspaces

Examples of techniques for environment modification for software application testing are described herein. An aspect includes, based on starting testing of an application under test using a test case in a testing environment and determining that modification of the testing environment is enabled, modifying the testing environment. Another aspect includes running the testing of the application under test using the test case in the modified testing environment. Another aspect includes, based on detection of an error during the testing of the application under test, determining whether the error was caused by the modified testing environment. Another aspect includes, based on determining that the error was caused by the modified testing environment, suppressing the error and continuing the testing of the application under test in the modified testing environment. Another aspect includes, based on determining that the error was not caused by the modified testing environment, percolating the error.

Environment modification for software application testing

Systems, methods, and computer-readable media are described for associating regression test cases with corresponding test fingerprints via a translation table or other suitable storage mechanism. A test fingerprint indicates a collection of breakpoints encountered as part of traversal of a code path during execution of a test case, and thus, provides an indication of an extent of code coverage of the test case. Test fingerprints can be evaluated to determine cumulative code coverage of sets of test cases. Specific sets of test cases can be selected based on the cumulative code coverage they provide. Sets of test cases that provide greater cumulative code coverage and/or that target specific areas of interest can be prioritized for execution particularly when having to adhere to execution constraints.

Associating attribute seeds of regression test cases with breakpoint value-based fingerprints

Systems, methods, and computer-readable media are described for performing revision control for a System Under Test (SUT) such as a body of source code. Prior to committing code changes, a collection of breakpoints associated with the portion(s) of source code being changed are determined. Stored fingerprints corresponding to regression test cases are evaluated to identify a set of stored fingerprints that are cumulatively indicative of the collection of breakpoints. Attributes respectively stored in association with the set of stored fingerprints are determined and a corresponding group of regression test cases are determined. The code changes are committed responsive to successful execution of the selected group of regression test cases.

Breakpoint value-based version control

A computer-implemented method for implementing a full space dynamic address translation ('DAT') structure and a subspace DAT structure is provided. A non-limiting example of the computer-implemented method includes determining, by a processor, that switching between the full space DAT structure and the subspace DAT structure is enabled by examining a bit in a control register. The method determines, by the processor, that there is a new context different from an existing context based on the bit in the control register indicating that switching is enabled, and switches, by the processor, the context of the DAT structures based on determining that the new context is different from the existing context.

Operational context subspaces

Systems, methods, and computer-readable media are described for generating fingerprints for regression tests that identify code paths taken during execution of the regression tests. Breakpoint values are assigned to breakpoints encountered during execution of a regression test and a fingerprint is generated based on the assigned breakpoint values and a code path taken during execution of the regression test. Various breakpoint value assignment/fingerprint generation algorithms are described herein that generate a fingerprint from which a corresponding code path taken can be reconstructed including which breakpoints are encountered, the number of times each such breakpoint is encountered, and the order in which the breakpoints are encountered.

Regression test fingerprints based on breakpoint values

Embodiments are provided for implementing a transparent conversion of common virtual storage requests to storage with limited access. Embodiments include providing a storage manager configured to perform address translation for requests, providing a data address translation (DAT) structure configured to connect a higher-level DAT table to a lower-level DAT table, and creating the DAT structure based on a request from a process. Embodiments also include responsive to receiving a storage request, performing a DAT fault process based on validating user credentials associated with an entry of the higher-level DAT table corresponding to the storage request, and responsive to the validation, updating the higher-level DAT table entry to allow access to the restricted-use portion of the common virtual storage, and otherwise, returning a DAT fault for the higher-level DAT table entry.

Transparent conversion of common virtual storage

Provided herein is a computer-implemented method. The computer-implemented method includes updating, by a processor, a value of a delta field of an entry of a data structure indexed for the processor. The computer-implemented method also includes comparing, by the processor, a predefined threshold for a global field corresponding to the delta field and the value of the delta field. The computer-implemented method also includes rolling, by the processor, the value of the delta field into the global field when an absolute value of the value of the delta field meets or exceeds the predefined threshold for the global field. Note that the data structure is stored in a first area of a memory in communication with the processor that is separate from a second area of the memory storing the global field.

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Beacon, NY, United States of America

Steven M Partlow