Method and system for reducing memory faults while running an operating system

• US 20060085670A1
• Filed: 10/18/2004
• Published: 04/20/2006
• Est. Priority Date: 10/18/2004
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: International Business Machines Corporation
• Inventors: Pagan, William G., Carver, Brian L.
• Granted Patent: US 7,308,603 B2
• Time in Patent Office: Days
• US Class Current: 714/5
• CPC Class Codes: G06F 11/1008 in individual solid state devices G06F11/1004 takes precedence

Abstract

Method and system for reducing memory faults for computer systems. In one aspect, a notification is received that indicates that a single bit error has been detected in a portion of memory of the computer system. A service program is used to isolate the portion of the memory that includes the detected single bit error by allocating the portion of memory to itself, such that the portion of memory may no longer be accessed for data reading or writing by programs running on the computer system.

Claims

1. A method for reducing memory faults in a computer system, the method comprising:

receiving a notification that a single bit error has been detected in a portion of memory of the computer system; and

using a service program to isolate the portion of the memory that includes the detected single bit error by allocating the portion of memory to itself, such that the portion of memory may no longer be accessed for data reading or writing by programs running on the computer system.

2. The method of claim 1 wherein the isolating of the portion of memory is performed while computer system and an operating system of the computer system continue to run normally.

3. The method of claim 1 wherein the service program runs under an operating system that is running on the computer system.

4. The method of claim 3 wherein the service program receives the notification, and wherein the notification is received from firmware that monitors for memory errors.

5. The method of claim 4 wherein the firmware includes a system management interrupt (SMI) program that provides the notification to the service program.

6. The method of claim 1 wherein receiving the notification includes receiving the address in the memory at which the single bit error occurred.

7. The method of claim 1 wherein the isolating of the portion of memory includes determining whether any programs are currently using the portion of memory that includes the detected single bit error.

8. The method of claim 7 wherein if any programs are currently using the portion of memory that includes the detected single bit error, the service program reallocates the contents of the portion of memory to a different portion of memory or to a different storage area.

9. The method of claim 1 wherein the isolating the portion of memory includes locking out all programs, including the service program, from using the portion of memory.

10. The method of claim 1 wherein the portion of memory is isolated if the detected single bit error is determined to be a hard error and not a soft error.

11. The method of claim 1 wherein the portion of memory is isolated if the detected single bit error is determined to be either a hard error or a soft error.

12. The method of claim 1 wherein the portion of memory is isolated after any number of bit errors are detected.

13. A system for reducing memory faults in a computer system, the system comprising:

firmware running on the computer system that is operative to determine when a single bit error has occurred in a memory of the computer system; and

a service program operative to receive a notification from the firmware that a single bit error has been detected in the memory of the computer system, wherein the service program is operative to allocate to itself a portion of the memory that includes the detected single bit error such that the portion of memory is isolated and may not be accessed for data reading or writing.

14. The system of claim 13 wherein the service program isolates the portion of memory while computer system and an operating system of the computer system continue to run normally.

15. The method of claim 13 wherein the service program runs under an operating system that is running on the computer system.

16. The system of claim 13 wherein the notification from the firmware includes the address in the memory at which the single bit error occurred.

17. The method of claim 13 wherein the firmware includes a system management interrupt (SMI) program that provides the notification to the service program.

18. The system of claim 13 wherein the service program determines whether any programs are currently using the portion of memory that includes the single bit error.

19. The system of claim 17 wherein the service program reallocates the contents of the portion of memory to a different portion of memory or to a different storage area, if any programs are currently using the portion of memory that includes the single bit error.

20. The system of claim 13 wherein the service program locks out all programs running on the computer system from using the portion of memory.

21. A computer readable medium including program instructions to be implemented by a computer system, the program instructions for reducing memory faults in the computer system, the program instructions implementing steps comprising:

receiving a notification that a single bit error has been detected in a portion of memory of the computer system; and

using a service program to isolate the portion of the memory that includes the detected single bit error by allocating the portion of memory to itself, such that the portion of memory may no longer be accessed for data reading or writing by programs running on the computer system.

22. The computer readable medium of claim 21 wherein the isolating of the portion of memory is performed while computer system and an operating system of the computer system continue to run normally.

23. The computer readable medium of claim 21 wherein the service program runs under an operating system that is running on the computer system.

24. The computer readable medium of claim 23 wherein the service program receives the notification, and wherein the notification is received from firmware that monitors for memory errors.

25. The computer readable medium of claim 24 wherein the firmware includes a system management interrupt (SMI) program that provides the notification to the service program.

26. The computer readable medium of claim 21 wherein receiving the notification includes receiving the address in the memory at which the single bit error occurred.

27. The computer readable medium of claim 21 wherein the isolating of the portion of memory includes determining whether any programs are currently using the portion of memory that includes the detected single bit error.

28. The computer readable medium of claim 27 wherein if any programs are currently using the portion of memory that includes the detected single bit error, the service program reallocates the contents of the portion of memory to a different portion of memory or to a different storage area.

29. The computer readable medium of claim 21 wherein the isolating the portion of memory includes locking out all programs running on the computer system, including the service program, from using the portion of memory.

30. The computer readable medium of claim 21 wherein the portion of memory is isolated if the detected single bit error is determined to be either a hard error or a soft error.

31. The computer readable medium of claim 21 wherein the portion of memory is isolated if the detected single bit error is determined to be a hard error and not a soft error.

32. The computer readable medium of claim 21 wherein the portion of memory is isolated after any number of bit errors are detected.

33. A method for reducing memory faults in a computer system, the method comprising:

receiving a notification from firmware that a single bit error has been detected in a portion of memory of the computer system; and

using a service program to allocate to itself the portion of the memory that includes the detected single bit error such that the portion of memory is isolated and may no longer be accessed for data reading or writing by all programs, wherein if any programs are currently using the portion of memory that includes the detected single bit error, the contents of the portion of memory are reallocated to a different portion of memory or to a different storage area.