Enhancement of real-time operating system functionality using a hypervisor

• US 20050251806A1
• Filed: 05/10/2004
• Published: 11/10/2005
• Est. Priority Date: 05/10/2004
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Da Silva, Dilma M., Xenidis, James, Day, Michael N., McKenney, Paul E., Wisniewski, Robert W., Krieger, Orran Y., Betzler, Boas, Ostrowski, Michal, Rosenburg, Bryan S., Auslander, Marc A.
• Application Number:
  US10/842,281
• Publication Number:
  US 20050251806A1
• Time in Patent Office: Days
• US Class Current: 718/100
• CPC Class Codes: G06F 9/45533 Hypervisors; Virtual machine monitors
• CPC Class Codes: G06F 9/4812 by interrupt, e.g. masked
• CPC Class Codes: G06F 9/4881 Scheduling strategies for dispatcher, e.g. round robin, multi-level priority queues

Abstract

A system, method and computer program product for enhancing a real-time operating system (RTOS) with functionality normally associated with a general purpose operating system (GPOS). A hypervisor that is adapted to perform a real-time scheduling function supports concurrent execution of an RTOS and a GPOS on a system of shared hardware resources. The RTOS or its applications can utilize services provided by the GPOS. Such services may include one or more of file system organization, network communication, network management, database management, security, user-interface support and others. To enhance operational robustness and security, the hypervisor can be placed in read-only storage while maintaining the ability to update scheduling mechanisms. A programmable policy manager that is maintained in read-write storage can be used to dictate scheduling policy changes to the hypervisor as required to accommodate current needs.

Claims

1. A system for enhancing a real-time operating system (RTOS) with functionality normally associated with a general purpose operating system (GPOS), comprising:

an RTOS;

a GPOS; and

a hypervisor supporting concurrent execution of said RTOS and said GPOS on a system of shared hardware resources, said hypervisor being adapted to perform a real-time scheduling function.

2. A system in accordance with claim 1 wherein said GPOS is adapted to provide services on behalf of said RTOS or its applications, said services including one or more of file system organization, network communication, network management, database management, security and user-interface support.

3. A system in accordance with claim 1 wherein said hypervisor resides in read-only storage and is adapted to implement plural scheduling mechanisms according to operational requirements.

4. A system in accordance with claim 3 wherein said hypervisor stores plural scheduling mechanisms that are selectable.

5. A system in accordance with claim 3 further including a policy manager that is adapted to control said scheduling function performed by said hypervisor.

6. A system in accordance with claim 5 wherein said policy manager is implemented as one of an application running on said hypervisor, a driver running within one of said operating systems, or a module running within one of said operating systems.

7. A system in accordance with claim 5 wherein said policy manager is adapted to control said scheduling function by selecting one of several scheduling mechanisms stored by said hypervisor.

8. A system in accordance with claim 5 wherein said policy manager is adapted to control said scheduling function by providing parameters to a scheduling mechanism stored by said hypervisor.

9. A system in accordance with claim 5 wherein said policy manager is adapted to control said scheduling function by providing a scheduling policy to said hypervisor for use in implementing a time-slotted scheduling mechanism, said scheduling policy specifying a time slot duration and a listing of prioritized tasks to be run in each time slot.

10. A system in accordance with claim 9 wherein said scheduling policy further includes one or more processor vectors to facilitate gang scheduling.

11. A method for enhancing a real-time operating system (RTOS) with functionality normally associated with a general purpose operating system (GPOS), comprising:

concurrently executing an RTOS and a GPOS on a system of shared hardware resources with support from a hypervisor; and

said hypervisor performing a real-time scheduling function.

12. A method in accordance with claim 11 wherein said GPOS provides services on behalf of said RTOS or its applications, said services including one or more of file system organization, network communication, network management, database management, security and user-interface support.

13. A method in accordance with claim 11 wherein said hypervisor is booted from read-only storage and is adapted to implement plural scheduling mechanisms according to operational requirements.

14. A method in accordance with claim 13 wherein said hypervisor stores plural scheduling mechanisms that are selectable.

15. A method in accordance with claim 13 further including controlling said scheduling function performed by said hypervisor using a policy manager.

16. A method in accordance with claim 15 wherein said policy manager is implemented as one of an application running on said hypervisor, a driver running within one of said operating systems, or a module running within one of said operating systems.

17. A method in accordance with claim 15 wherein said policy manager controls said scheduling function by selecting one of several scheduling mechanisms stored by said hypervisor.

18. A method in accordance with claim 15 wherein said policy manager controls said scheduling function by providing parameters to a scheduling mechanism stored by said hypervisor.

19. A method in accordance with claim 15 wherein said policy manager controls said scheduling function by providing a scheduling policy to said hypervisor for use in implementing a time-slotted scheduling mechanism, said scheduling policy specifying a time slot duration and a listing of prioritized tasks to be run in each time slot.

20. A method system in accordance with claim 19 wherein said scheduling policy further includes one or more processor vectors to facilitate gang scheduling.

21. A computer program product for enhancing a real-time operating system (RTOS) with functionality normally associated with a general purpose operating system (GPOS), comprising:

one or more data storage media;

programming means recorded on said data storage media for programming a system of shared hardware resources to operate as by;

concurrently executing an RTOS and a GPOS on said system with support from a hypervisor; and

said hypervisor performing a real-time scheduling function.

22. A computer program product in accordance with claim 21 wherein said programming means are further adapted to program said system to operate as by said GPOS providing services on behalf of said RTOS or its applications, said services including one or more of file system organization, network communication, network management, database management, security and user-interface support.

23. A computer program product in accordance with claim 21 wherein said programming means are further adapted to program said system to operate as by booting said hypervisor from read-only storage and enabling said hypervisor to implement plural scheduling mechanisms according to operational requirements.

24. A computer program product in accordance with claim 23 wherein said programming means are further adapted to program said system to operate as by said hypervisor storing plural scheduling functions that are selectable.

25. A computer program product in accordance with claim 23 wherein said programming means are further adapted to program said system to operate as by controlling said scheduling function performed by said hypervisor using a policy manager.

26. A computer program product in accordance with claim 25 wherein said programming means are further adapted to program said system to operate as by implementing said policy manager as one of an application running on said hypervisor, a driver running within one of said operating systems, or a module running within one of said operating systems.

27. A computer program product in accordance with claim 25 wherein said programming means are further adapted to program said system to operate as by said policy manager controlling said scheduling function by selecting one of several scheduling mechanisms stored by said hypervisor.

28. A computer program product in accordance with claim 25 wherein said programming means are further adapted to program said system to operate as by said policy manager controlling said scheduling function by providing parameters to a scheduling mechanism stored by said hypervisor.

29. A computer program product in accordance with claim 25 wherein said programming means are further adapted to program said system to operate as by said policy manager controlling said scheduling function by providing a scheduling policy to said hypervisor for use in implementing a time-slotted scheduling mechanism, said scheduling policy specifying a time slot duration interval and a listing of prioritized tasks to be run in each time slot.

30. A computer program product in accordance with claim 29 wherein said programming means are further adapted to program said system to operate as by said scheduling policy further including one or more processor vectors to facilitate gang scheduling.

31. A policy manager computer program product for use with a hypervisor running on a system of shared hardware resources to enhance a real-time operating system (RTOS) with functionality normally associated with a general purpose operating system (GPOS), comprising:

one or more data storage media;

programming means recorded on said data storage media for managing said hypervisor as by;

providing scheduling control information to assist said hypervisor implement a real-time scheduling function.

32. A policy manager computer program product in accordance with claim 31 wherein said programming means are adapted to manage said hypervisor as by providing a selection input for selecting one of several scheduling mechanisms stored by said hypervisor.

33. A policy manager computer program product in accordance with claim 31 wherein said programming means are adapted to manage said hypervisor as by providing parameters to a scheduling mechanism stored by said hypervisor.

34. A policy manager computer program product in accordance with claim 31 wherein said programming means are adapted to manage said hypervisor as by providing a scheduling policy for use in implementing a time-slotted scheduling mechanism, said scheduling policy specifying a time slot duration interval and a listing of prioritized tasks to be run in each time slot.

35. A policy manager computer program product in accordance with claim 34 wherein said programming means are adapted to manage said hypervisor program as by said scheduling policy further including one or more processor vectors to facilitate gang scheduling.

36. A system for enhancing a real-time operating system (RTOS) with functionality normally associated with a general purpose operating system (GPOS), comprising:

an RTOS;

a GPOS; and

a hypervisor supporting concurrent execution of said RTOS and said GPOS on a system of shared hardware resources, said hypervisor being adapted to;

provide a virtual machine environment for at least said RTOS;

perform a real-time scheduling function; and

facilitate inter-OS communication that allows said RTOS or its applications to utilize services provided by said GPOS.

37. A system for enhancing a real-time operating system (RTOS) with functionality normally associated with a general purpose operating system (GPOS), comprising:

an RTOS;

a GPOS; and

a hypervisor supporting concurrent execution of said RTOS and said GPOS on a system of shared hardware resources, said hypervisor being adapted to perform a real-time scheduling function; and

a policy manager that is adapted to control said scheduling function performed by said hypervisor.