Methods and apparatus to diagnose software

• US 7,278,058 B1
• Filed: 08/25/2004
• Issued: 10/02/2007
• Est. Priority Date: 08/25/2004
• Status: Active Grant

• Current Assignee: Unisys Corporation
• Original Assignee: Unisys Corporation
• Inventors: Narisi, Anthony
• Primary Examiner(s): Beausoliel; Robert
• Assistant Examiner(s): Riad; Amine
• Application Number:
  US10/925,419
• Time in Patent Office: 1,133 Days
• Field of Search: 714/38
• US Class Current: 714/38.11
• CPC Class Codes: G06F 11/3636 by tracing the execution of the program
• CPC Class Codes: G06F 11/366 using diagnostics G06F11/0703 takes precedence

Abstract

Methods and apparatus to diagnose software including diagnostic gathering instructions are disclosed. The software is diagnosed by storing diagnostic information to a plurality of individual trace buffers responsive to the diagnostic gathering instructions, consolidating the diagnostic information from the plurality of individual trace buffers to a consolidated trace buffer, and presenting at least a portion of the consolidated diagnostic information.

Claims

1. A method to diagnose software including diagnostic gathering instructions, wherein the software controls a multi-threaded device driver associated with a plurality of system processors and an interrupt handler, the method comprising the steps of:

allocating an individual trace buffer for each instance of the interrupt handler and for each system processor when not executing within an instance of the interrupt handler to form a plurality of individual trace buffers;

storing diagnostic information to the plurality of individual trace buffers responsive to the diagnostic gathering instructions;

consolidating the diagnostic information from the plurality of individual trace buffers to a consolidated trace buffer; and

presenting at least a portion of the consolidated diagnostic information.

2. The method of claim 1, wherein the software is a multi-threaded application and wherein the method further comprises the step of:

allocating an individual trace buffer for each thread of the multi-threaded application.

3. The method of claim 1, further comprising the step of:

allocating a trace control information data structure, the trace control information data structure storing information related to the plurality of individual trace buffers.

4. The method of claim 3, wherein the consolidating step comprises the steps of:

retrieving the trace control information data structure;

retrieving diagnostic information from each of the plurality of individual trace buffers in the consolidated trace buffer; and

retrieving text strings referenced by each of the plurality of individual trace buffers.

5. The method of claim 1, wherein the presenting step comprises the step of:

processing the consolidated trace entries; and

presenting the processed consolidated trace entries.

6. The method of claim 1, wherein at least one of the diagnostic gathering instructions includes a variable identifier associated with a data item and wherein the method further comprises the step of:

processing the variable identifier to generate text describing the data item.

7. An apparatus to diagnose software including diagnostic gathering instructions, wherein the software controls a multi-threaded device driver associated with a plurality of system processors and an interrupt handler, the apparatus comprising:

a plurality of individual trace buffers configured to store diagnostic information associated with the diagnostic gathering instructions, wherein an individual trace buffer is allocated for each instance of the interrupt handler and for each system processor when not executing within an instance of the interrupt handler to form the plurality of individual trace buffers; and

a consolidated trace buffer configured to store copies of the plurality of individual trace buffers.

8. The apparatus of claim 7, further comprising:

a trace control information data structure configured to store information associated with each of the plurality of individual trace buffers;

wherein the consolidated trace buffer is further configured to store a copy of the trace control information data structure.

9. The apparatus of claim 7, further comprising:

a trace generation module configured to allocate individual trace buffers responsive to the diagnostic gathering instructions and store the diagnostic information to the allocated individual trace buffers.

10. The apparatus of claim 7, further comprising:

a trace harvest module configured to store a copy of the individual trace buffers to the consolidated trace buffer.

11. The apparatus of claim 10, wherein the trace analysis module is further configured to order the diagnostic information in time.

12. The apparatus of claim 7, further comprising:

a trace analysis module configured to process the diagnostic information in the consolidated trace buffer.

13. The apparatus of claim 7, wherein the plurality of individual trace buffers are further configured to store diagnostic information including variable length text strings.

14. The apparatus of claim 7, wherein the diagnostic information includes one or more trace entries and wherein the plurality of individual trace buffers are further configured to store a variable number of data items in each trace entry.

15. A computer readable storage medium including diagnostic software that is configured to control a computer to implement a software diagnostic processing method to diagnose software including diagnostic gathering instructions, wherein the software controls a multi-threaded device driver associated with a plurality of system processors and an interrupt handler, the processing method including the steps of:

allocating an individual trace buffer for each instance of the interrupt handler and for each system processor when not executing within an instance of the interrupt handler to form a plurality of individual trace buffers;

storing diagnostic information to a plurality of individual trace buffers responsive to the diagnostic gathering instructions;

consolidating the diagnostic information from the plurality of individual trace buffers to a consolidated trace buffer; and

presenting at least a portion of the consolidated diagnostic information.

16. The computer readable storage medium of claim 15, wherein the software is a multi-threaded application and wherein the method implemented by the computer further comprises the step of:

allocating an individual trace buffer for each thread of the multi-threaded application.

17. The computer readable storage medium of claim 15, wherein the processing method implemented by the computer further comprises the step of:

allocating a trace control information data structure, the trace control information data structure storing information related to the plurality of individual trace buffers.

18. The computer readable storage medium of claim 17, wherein the consolidating step for implementation by the computer comprises the steps of:

retrieving the trace control information data structure;

retrieving diagnostic information from each of the plurality of individual trace buffers in the consolidated trace buffer; and

retrieving text strings referenced by each of the plurality of individual trace buffers.

19. The computer readable storage medium of claim 15, wherein the presenting step for implementation by the computer comprises the step of:

processing the consolidated trace entries; and

presenting the processed consolidated trace entries.

20. The computer readable storage medium of claim 15, wherein at least one of the diagnostic gathering instructions includes a variable identifier associated with a data item and wherein the method implemented by the computer further comprises the step of:

processing the variable identifier to generate text describing the data item.