Dynamic hibernation time in a computer system

• US 5,920,728 A
• Filed: 04/23/1998
• Issued: 07/06/1999
• Est. Priority Date: 07/19/1996
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Fritz, Brian C., Hallowell, William C.
• Primary Examiner(s): Sheikh, Ayaz R.
• Assistant Examiner(s): PANCHOLI, JIGAR K
• Application Number:
  US09/065,357
• Time in Patent Office: 439 Days
• Field of Search: 395/750.01-750.08
• US Class Current: 713/340
• CPC Class Codes: G06F 1/30 Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations for resetting only G06F1/24
• CPC Class Codes: G06F 11/1441 Resetting or repowering
• CPC Class Codes: G06F 9/4418 Suspend and resume; Hibernate and awake
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A dynamic hibernation time apparatus monitors and ensures that battery packs in a computer system have sufficient energy capacity to sustain a proper saving of the hibernation file into the hard disk drive. The invention determines the memory size of the computer and adds the storage space needed to store the chip register contents to arrive at the determination of the hibernation file size. Next, the time necessary to save the hibernation file on the disk data storage device and the hibernation energy required to operate the disk data storage device to completely save the hibernation file are determined. When the battery capacity drops within a range of the previously computed hibernation energy, a warning message is generated at the user and the hibernation file is saved. The computer is shut down after the hibernation file has been properly saved. Thus, by determining the total memory size to be saved in the hibernation file, by determining the time and the energy required to completely store the hibernation file into the disk drive, and by sensing either the battery capacity or requesting that the smart battery sends an alarm to initiate the hibernation file saving process, the present invention ensures that sufficient energy exists in the battery packs to properly save the hibernation file onto the hard disk drive before system shut down occurs due to low battery capacity without wasting energy by determining the set point based on a maximum memory configuration.

Claims

1. A method for hibernating a computer, said computer having a hibernation file, a memory, a data storage device and a battery, said battery having a battery capacity, said method comprising the steps of:

determining the size of said hibernation file;

determining a suitable hibernation energy level required to operate said data storage device until said hibernation file has been saved based on said determined size;

determining when said battery capacity drops to said determined hibernation energy level; and

hibernating said computer when said battery capacity drops to said determined hibernation energy level.

2. The method of claim 1, wherein said hibernation file size determining step further comprises the steps of:

retrieving a memory size from said computer;

determining a memory capacity needed to store chip and register content; and

adding said memory size with said memory capacity to arrive at said memory size.

3. The method of claim 2, wherein the computer is a portable computer.

4. The method of claim 1, wherein said battery capacity determining step further comprises the step of periodically checking the capacity of said battery.

5. The method of claim 1, wherein said battery is a smart battery and wherein said battery capacity determining step further comprises the step of programming said battery to report to said computer when said battery capacity drops to said hibernation energy level.

6. The method of claim 1, wherein said battery capacity determining step analyzes the capacity of said battery as a percentage of full battery capacity.

7. The method of claim 1, wherein said battery capacity determining step determines remaining battery capacity in ampere hours.

8. An apparatus for hibernating a computer, said computer having a hibernation file, a memory, a data storage device and a battery, said memory having a memory size, said battery having a battery capacity, said apparatus comprising:

a processor coupled to said memory, said data storage device and said battery;

a memory analyzer coupled to said hibernation file for determining the size of said hibernation file;

a hibernation energy analyzer coupled to said memory analyzer and said processor, said hibernation energy analyzer determining a hibernation energy level required to operate said data storage device until the hibernating process is completed;

a battery capacity monitor coupled to said battery and said processor, said battery capacity monitor asserting an output when said battery capacity drops below said hibernation energy level; and

a file saver coupled to said hibernation file, said data storage device, said battery capacity monitor and said processor, said file saver writing the content of said hibernation file to said data storage device when said battery capacity monitor output is asserted.

9. The apparatus of claim 8, wherein said computer has one or more support components with registers, wherein said memory analyzer further comprises:

a system memory size analyzer coupled to said processor and said memory to determine the memory size of said system memory;

a register content size analyzer coupled to said support components, said register content sizer analyzer determining a memory capacity to store the content of said registers; and

an adder coupled to said system memory size analyzer and to said register content size analyzer.

10. The apparatus of claim 8, wherein said battery energy monitor periodically checks the capacity of said battery.

11. The apparatus of claim 8, wherein said battery is a smart battery and wherein said battery capacity monitor programs said smart battery to report to said computer when said battery capacity drops to said hibernation energy level.

12. The apparatus of claim 8, wherein said battery capacity monitor analyzes the capacity of said battery as a percentage of full battery capacity.

13. The apparatus of claim 8, wherein said battery capacity monitor analyzes the remaining capacity of said battery in ampere hours.

14. A computer system, comprising:

an expansion base unit; and

a portable computer coupled to said expansion base unit, said portable computer having a hibernation file, a memory, a data storage device and a battery, said memory having a memory size, said battery having a battery capacity, said portable computer comprising;

a processor coupled to said memory, said data storage device and said battery;

a memory analyzer coupled to said hibernation file for determining the size of said hibernation file;

a hibernation energy analyzer coupled to said memory analyzer and said processor, said hibernation energy analyzer determining a hibernation energy level required to operate said data storage device until the hibernating process is completed;

a battery capacity monitor coupled to said battery and said processor, said battery capacity monitor asserting an output when said battery capacity drops below said hibernation energy level; and

a file saver coupled to said hibernation file, said data storage device, said battery capacity monitor and said processor, said file saver writing the content of said hibernation file to said data storage device when said battery capacity monitor output is asserted.

15. The computer system of claim 14, wherein said portable computer has one or more support components with registers, wherein said memory analyzer further comprises:

a system memory size analyzer coupled to said processor and said memory to determine the memory size of said system memory;

a register content size analyzer coupled to said support components, said register content sizer analyzer determining a memory capacity to store the content of said registers; and

an adder coupled to said system memory size analyzer and to said register content size analyzer.

16. The computer system of claim 14, wherein said battery energy monitor periodically checks the capacity of said battery.

17. The computer system of claim 14, wherein said battery is a smart battery and wherein said battery capacity monitor programs said smart battery to report to said portable computer when said battery capacity drops to said hibernation energy level.

18. The computer system of claim 14, wherein said battery capacity monitor analyzes the capacity of said battery as a percentage of full battery capacity.

19. The computer system of claim 14, wherein the battery capacity determining step determines the remaining battery capacity in ampere hours.