MULTI-PHASE RESUME FROM HIBERNATE

• US 20120221843A1
• Filed: 02/24/2011
• Published: 08/30/2012
• Est. Priority Date: 02/24/2011
• Status: Active Grant

• Current Assignee: Zhigu Holdings Limited
• Original Assignee: Microsoft Corporation
• Inventors: Bak, Yevgeniy M., Stark, Kirsten V., Iyigun, Mehmet, Wilson, Emily N., Rogers, Andrew D., Schwartz, James A. Jr., Judge, Nicholas Stephen
• Granted Patent: US 8,694,764 B2
• Time in Patent Office: Days
• US Class Current: 713/100
• CPC Class Codes: G06F 9/4418 Suspend and resume; Hibernate and awake

Abstract

Resume of a computing device from hibernation may be performed in multiple phases. Each phase may partially restore a state of the computing device to an operational state and may establish an environment in which another phase of the resume is performed. The hibernation information may be partitioned to store separately data to be used at each resume phase. The information may be stored in a compressed form. In a first phase, a boot-level resume loader may restore a portion of the operating system based on a portion of the hibernation information. The restored portion may be used in a second phase to retrieve hibernation information from another portion through the operating system (OS). Multiple processors supported by the OS may read and decompress the hibernation information that is then moved back to operational memory. The operating system may support asynchronous disk input/output or other functions that accelerate the resume process.

Claims

1. A method of operating a computing device comprising at least one processor, the method comprising:

partially resuming the computing device from a hibernation mode by retrieving first hibernation information from non-volatile storage to restore a portion of the operating system of the computing device; and

using the restored portion of the operating system to retrieve second information from the non-volatile storage to restore a state of the computing device at a time of entering the hibernation mode.

2. The method of claim 1, further comprising storing the second hibernation information in the non-volatile storage in a compressed form.

3. The method of claim 2, wherein:

restoring the state of the computing device comprises reading a first portion of the compressed second hibernation information from the non-volatile storage and recording the first portion of the compressed second hibernation information into a buffer; and

when the first portion of the compressed second hibernation information is recorded in the buffer, retrieving the first portion of the second compressed hibernation information from the buffer and decompressing the first portion concurrently with reading a second portion of the compressed second hibernation information from the non-volatile storage.

4. The method of claim 3, wherein:

the computing device comprises at least a first processor and a second processor;

retrieving from the buffer and decompressing the first portion is performed by the first processor; and

reading the second portion from the non-volatile storage is performed by the second processor.

5. The method of claim 4, wherein:

the second processor reads the second portion from the non-volatile storage via a synchronous input/output (I/O) operation.

6. The method of claim 3, wherein:

The at least one processor comprises a processor;

retrieving from the buffer and decompressing is performed by the processor; and

reading the second portion from the non-volatile storage is performed by the processor, via an asynchronous input/output (I/O) operation.

7. The method of claim 1, wherein:

partially resuming the computing device comprises executing a resume loader in a pre-operating system environment of the computing device; and

the portion of the operating system comprises a kernel loader in the operating system of the computing device.

8. The method of claim 1, wherein:

the first hibernation information and the second hibernation information are recorded in a file.

9. A system comprising:

a volatile storage medium;

a non-volatile storage medium comprising hibernation information, the hibernation information comprising;

a first portion,

a second portion, and

header information identifying the first portion and the second portion; and

firmware, comprising;

computer executable instructions that, when executed, implement a first resume loader to store information in the volatile storage medium based on the first portion;

wherein the first portion comprises a representation of computer-executable instructions that, when executed, implement a second resume loader to store information in the volatile storage medium based on the second portion.

10. The system of claim 9, wherein:

the second portion is stored the non-volatile storage medium in a compressed form.

11. The system of claim 10, further comprising a plurality of processors.

12. The system of claim 11, wherein the second resume loader restores a state of the system at a time of hibernation, the restoring comprises, with the plurality of processors, by:

with a first of the plurality of processors reading segments of the compressed second portion from the non-volatile storage medium and recording the compressed segments of the second portion in a buffer; and

retrieving segments of the second portion from the buffer and decompressing the compressed segments.

13. The system of claim 9, wherein:

the system comprises a processor;

a processor reads the second portion from the non-volatile storage medium via an asynchronous input/output (I/O) operation.

14. A method of operating a computing device comprising:

with computer-executable instructions stored in firmware;

accessing a first portion of hibernation information stored in non-volatile memory;

storing first information in operational memory based on the first portion of the hibernation information; and

with computer-executable instructions contained within the first information;

accessing a second portion of the hibernation information stored in non-volatile memory;

storing second information in operational memory based on the second portion of the hibernation information.

15. The method of claim 14, further comprising:

at a time of hibernation;

recording in the first portion of the hibernation information in the non-volatile memory the first information comprising information used to restore a portion of the operating system of the computing device; and

recording in the second portion of the hibernation information in the non-volatile memory the second information comprising information on a state of the computing device at the time of hibernation.

16. The method of claim 15, further comprising:

compressing the first information prior to recording the first information in the first portion with a first compression algorithm; and

compressing the second information prior to recording the second information in the second portion with a second compression algorithm.

17. The method of claim 16, further comprising:

dynamically selecting a first compression algorithm to compress the first information based on capabilities of at least one component of the computing device to be used to access the first portion to store the first information in the operational memory; and

dynamically selecting a second compression algorithm to compress the second information based on at least one of disk input (I/O) speed and capabilities of a plurality of processors of the computing device to be used to access the second portion to store the second information in the operational memory.

18. The method of claim 14, wherein:

accessing the second portion of the hibernation information comprises reading segments of the second portion from the non-volatile memory and buffering the segments; and

storing second information in operational memory comprises retrieving the buffered segments.

19. The method of claim 18, wherein:

reading the second portion from the non-volatile memory occurs via synchronous input/output (I/O) operations.

20. The method of claim 14, wherein:

the first information comprises computer executable instructions that, when executed, implement a boot-level resume loader to store information in the operational memory based on the first portion;

the computer executable instructions, when executed, implement a kernel-level resume loader to store information in the operational memory based on the second portion.