Method and apparatus for a multi-layer system quiescent suspend

Details Method and apparatus for a multi-layer system quiescent suspend Method and apparatus for a multi-layer system quiescent suspend

1994-01-31

1997-12-09

Toplu, Lucien U.

395652, 39518221, 39518222, G06F 1100

Patent

active

056968973

ABSTRACT:
The state of a functioning computer operating system is quickly stored onto a nonvolatile storage device such that the computer system may be suspended quickly. To quickly save the state of computer operating system, a process firsts prepares for the computer system suspend by allocating a file on the root file system that will store operating system state data. The process then warns each user application process running on the computer system to allow each user application process to prepare for the suspend. After the warning, the process suspends each user application process. The memory space used by each user application process is then swapped out to nonvolatile storage. Next, the various kernel daemons and operating system subsystems are suspended. Finally the process suspends the device drivers running on the computer system such that there is no activity in the computer system. A compressed version of the operating system state is then written to a nonvolatile storage device. To resume operation of the suspended computer system, the steps are performed in the reverse order.

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Silbershatz, et al.; Operting System Concepts; Addison-Wesley; 1994.
Article from Hitachi; Hitach Review, v 36. n4; 1987, pp. 197-200.

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