KR101392062B1 - Fast speed computer system power-on ＆ power-off method - Google Patents

Abstract

The high-speed computer system power-on and power-off method is used to reduce the amount of main memory transferred and stored from the main memory to the secondary storage device to increase the rate of reactivation of the computer system from the hibernation state to the full- . The high-speed computer system power-on and power-off methods are applicable to various types of computer systems and may be used in conjunction with random access processing techniques to record or reverse load data. In addition, the method can be used to reduce the degree of data loss and corruption of the computer system due to abrupt power failure of the computer system.

Description

[0001] POWER-ON & POWER-OFF METHOD FOR FAST SPEED COMPUTER SYSTEM [0002]

The present invention relates to computer system power-on and power-off methods, and more particularly to a high speed computer system power on and power off method applicable when a computer system enters a power saving mode.

In general, the operating state of a typical computer system includes a power saving mode, in addition to the normal mode of operating the operating system and various application programs. The purpose of computers to enter hibernation is to save energy on the one hand and reduce the noise of the system on the other.

According to the design classification of the Advanced Configuration and Power Interface (ACIP), there are two types of hibernation for computer systems: one is the Suspend-To-RAM (STR) state And the other is a Spend-To-Disk (STD) state (also referred to as S4 state). In the S3 state, the computer system simply continues to provide power to portions of volatile memory, including frame buffers, main memory, and the like, and to power off the remaining portions. There are two advantages to the S3 state: one is that the computer system will be faster to return to full-speed operation; The other is that the S3 state is used for better security when the user is operating private and secret data and does not want to store this data on the hard disk. Another type of hibernation is a spanned-to-disk (STD) state (also referred to as S4 state). In the S4 state, the advantage of the S4 state is better power savings since all of the operating data is written into nonvolatile memory for storage and then the entire computer system is powered off.

However, the effects and performance of the above-described states S3 and S4 of hibernation are not very satisfactory. This is because when the computer system enters the S3 state, power must continuously be provided to the volatile memory within the computer system to maintain the system storage ecology. If the S4 state is employed, the speed at which the computer system returns to full speed operation is much slower than the speed of the S3 state, even though power is saved more than S3 state.

SUMMARY OF THE INVENTION In view of the problems and disadvantages of the prior art, the present invention discloses a high-speed computer system power-on and power-off method which reduces the memory used when the computer system enters the hibernation, Thereby enabling to increase the reaction rate and efficiency to be reactivated.

It is a primary object of the present invention to provide a high speed computer system power on and power off method that allows the amount of memory used in the system to be drastically reduced when the computer system enters the hibernation, Thereby reducing the amount of data transferred, thereby increasing the speed of the computer system returning to full speed operation.

Another object of the present invention is to provide a high-speed computer system power-on and power-off method, which can reduce the degree of data loss and damage during a temporary power supply period of a computer system.

It is a further object of the present invention to provide a high speed computer system power on and power off method wherein the data recording and data retrieval are performed in a random access manner so that when the computer system enters the hibernation, The data access speed can be greatly increased.

In order to achieve the above object, the present invention provides a high-speed computer system power-on and power-off method, such that when a computer system enters a hibernation, at least a portion of the main memory contained within the computer system includes a plurality of clean pages clean pages and a plurality of dirty pages, the clean pages being swapped out and abandoned storage, the dirty pages being recorded in a hibernation file and being swapped out of at least a secondary storage device Space and file system. Thus, once the computer system is reactivated, these dirty pages are reloaded from the swap space and file system to the hibernation file and vice versa, so that the computer system can retrieve the necessary data from the secondary storage device And then load it back into the main memory. As such, the computer system is configured to reduce the amount of data to be transferred and the amount of data stored in the secondary storage device from the main memory in order to speed up computer system reactivation and return to maximum operating speed .

The scope of additional applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are provided by way of example only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. It will be clear.

Due to the above-described configuration, the present invention enables the amount of memory used in the system to be drastically reduced when the computer system enters the hibernation, so that the amount of data transferred from the main memory to the secondary storage device Thereby increasing the speed of the computer system returning to full speed operation. Furthermore, the present invention can reduce the degree of data loss and corruption during a temporary power supply mid-term of a computer system, and when the computer system enters hibernation, or when it is reactivated at full speed operation, .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are to be taken in conjunction with the following detailed description of the invention, are as follows:
1 is a schematic illustration of a high speed computer system power on and power off device in accordance with the present invention; And
2 is a flow diagram of the steps of a high speed computer system power on and power off method in accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, features, features, and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

In the present invention, the high-speed computer power-on and power-off method is proposed so that the amount of memory used decreases as the computer system enters the hibernation, thereby reducing the amount of data written to the secondary storage device, Increasing the speed of the computer system, or reactivating or restoring to full speed operation. In the following, preferred embodiments are described to illustrate the technical features of the present invention. First, reference is made to Fig. 1, which shows a schematic diagram of a high speed computer system power on and power off device of the present invention. 1, the computer system 10 includes a central processing unit (CPU) 12, a main memory 14, and a secondary storage device 16. The secondary storage device 16 may be a high speed random access memory (RAM) device such as a flash memory and is typically used for the file system 18, the swap space 20, and the hibernation file 22 .

Reference is now made to Fig. 2 of the flow diagram of the steps of a high speed computer system power on and power off method of the present invention, while referring to Fig. 2, first, as shown in step S30, the operating system (OS) of the computer system 10 enters the hibernation mode and uses the section or page as a unit to access the main memory 14 ) Into clean pages and dirty pages. Since copies having exactly the same contents as the clean pages are stored in the secondary storage device 16, the swapped out clean pages can be discarded storage. Therefore, a kernel function is used to allocate main memory 14 and control the swap-out of clean pages. The kernel function may allocate the main memory 14 based on the amount of clean pages needed to swap out and release main memory after swap out of clean pages. The dirty pages in the machine state are stored in the hibernation file 22 and then in the swap space 20 and the file system 18 of the secondary storage device 16. [ Here, the dirty pages may be stored according to their addresses, and the dirty pages of successive addresses may be merged into a single write command. Then, at step S32, when the computer system 10 is reactivated, the computer system 10 reads the hibernation file 22 from the swap space 20 and the file system 18 and writes the hibernation file to the main memory 14 ) To restore the system state. Finally, as shown in S34, the computer system 10 will read the data from the secondary storage device 16 and load it back into the main memory 14.

The rate at which the computer system suspends the Suspend-To-Flash function and stops sending the data to the secondary storage device 16, such as a flash memory, is primarily written to non-volatile memory It depends on the amount of data that is needed. Swapping-Before-Hibernating is executed by the operating system (OS) through existing memory management techniques included internally, thereby allowing most of the memory pages to be directly discarded without performing any writing operation, Can be increased. Upon execution of the resume function, the data can be retrieved from each of the three locations in reverse: the hibernation file 22, the swap space 20, and the file system 18. The main data and code of the system belonging to the kernel will be immediately retrieved as soon as the computer system is reactivated and the remaining data will be stored in a paging-on-demand fashion Is searched in reverse. The amount of data needed by the user is much less than the amount of all data in the main memory prior to suspension of the system, so the recall rate may increase.

In general, a memory page can be classified into three categories as follows: a free page, an anonymous page, and a named page. Since the free pages are memories not currently used by the system, the contents in the free pages are meaningless to the system. Anonymous pages are memory dynamically allocated during execution of a program, and portions of this memory mainly include: a stack and a heap. The page with the name is a copy of the file in the main memory 14 and its behavior is similar to the behavior of the cache memory in the secondary storage device 16. [ A page with a name contains: a dynamic-link library corresponding to the executable file and specific locations in memory, and the program uses a memory mapping file to map the file to memory. The anonymous pages and the pages with the names may all be clean pages or dirty pages. If the dirty anonymous page is swapped out, it should be written to the swap space 20, and the page with the dirty name will be swapped out into the file system 18. The operating system (OS) needs to swap out clean pages because this page must have exactly the same copy of the contents as in the secondary storage device 16, so the operating system (OS) will be.

When the system starts performing the suspend-to-flash, most of the pages do not need to be back-written to the secondary storage device 16, since most of these pages are clean pages. Some of the pages must be written back to the swap space 20 and the file system 18 and the remaining pages are non-swqppable memory, and these pages are often the kernel of the operating system, It is set by the program as non-swappable due to performance reasons. Finally, the non-swappable memory will be written to the hibernation file 22.

Upon restarting the computer system, upon completion of the routine hardware initialization and loading into the OS loader, the system will determine whether it will return from a hibernation state to a normal state, or perform a generic power-on procedure. In the former case, the data in the hibernation file 22 will first be loaded into the main memory 14. Upon completion of this operation, the OS completed the basic power-on procedure. Then, according to user requirements, the computer system loads the data in file system 18 and swap space 20 back into main memory 14 and returns to the original system state. The swapping nonforge hibernating function needs to be run again because at this point some of the dirty pages are written to the swap space 20 during the execution of the last swapping nonforge hyperreporting function and these pages become clean pages And therefore the CPU 12 will not perform a write operation on these pages, so these pages do not need to be written back into the swap space 20.

A flash memory serving as the secondary storage device 16 may have near-continuous access performance in random access through the use of optimization techniques. With the Writing-Combining function, small random writes resulting from swapout of memory pages are queued before they are actually written to flash memory, and these pages are first sorted according to their physical addresses It can then be determined whether continuous full writes are present in these swapped-out pages. If the answer is affirmative, a large write request operation is used to increase the speed of the swapping nonforge hibernating function by replacing a plurality of smaller write request operations.

In order to prevent the optimizing operation of the OS from affecting the amount of memory actually allocated when allocating main memory in the process of writing swap-enabled pages to the secondary storage device 16, (OS). ≪ / RTI > Thus, once a page is allocated, the data bytes are written into the page by allowing the OS to immediately allocate physical memory to the program. With this mandatory behavior, the OS swaps out a large portion of memory. Subsequently, operations that are free to return all memory requested and obtained from the system back to the OS are performed.

Through the implementation of the two steps described above, most of the pages in the operating system (OS) will be free pages, so that these free pages do not need to be written back to the hibernation file 22.

In addition, the request can be made directly in the kernel of the operating system (OS) to allocate memory so that the requested pages can be allocated immediately through the kernel function, while still requiring additional write operations Do not. Upon completion of the allocation of memory, the free operation is immediately performed and the system will generate a large number of free pages. Since memory allocation is done through the kernel function, no additional write operations are required. Therefore, the number of pages swapped out can be calculated and obtained in advance, so that it can be calculated how much memory is required for allocation.

Moreover, the swapper mechanism in the operating system (OS) can be manipulated directly to allocate the required memory. In this case, a Linux operating system (OS) can be employed, and its kernel is provided with a memory management function, i.e., Shrink_All_Memory function. This function is used to retrieve memory pages, and as soon as it is called, it can be loaded with the amount of pages to be retrieved so that the memory pages are freed up without affecting the stability of the system and programs used by users, . The mechanism of the Shrink_All_Memory feature is implemented through two recent least-recently used (LRU) lists within the kernel: the active list and the inactive list. Where the active list includes pages that have not been accessed most recently and the inactive list includes pages that have not been accessed for a particular period of time. In practical application, the Shrink_All_Memory function will first start the search pages from the inactive list, and then search the pages from the active list. Thus, through the application of the Shrink_All_Memory function, pages can be swapped as needed without affecting the operation of the kernel of the systems and programs used by users.

From the perspective of the kernel in the Linux operating system (OS), the secondary storage device 16 is considered as a normal input / output device, and when the memory pages are swapped out in the swap space 20 The parameters received by the Submit_Bio function may include: the number of sectors, the read / write command, the memory address, and the memory length, etc., so that pages swapped out can be further processed by intercepting the Submit_Bio function .

As described above, the pages to be swapped out are determined by the Shrink_All_Memory function based on the usage state of the page and not based on its own physical address in the main memory 14. In the application, first queuing the write requests generated by the Shrink_All_Memory function, then categorizing the pages according to the physical memory address, reducing the number of input / output accesses and increasing the size of the input / output requests. The larger the request size, the better the write performance of the flash memory serving as the secondary storage device 16. When the memory page is swapped out, the kernel must record the location of the page in the swap space 20, so that the kernel can reload the page from the secondary storage device 16 to the main memory 24. Each time the Shrink_All_Memory function is rewritten and the Shrink_All_Memory function is performed, the location of each record page in the swap space 20 must be authenticated, so this information is the swapped out page identifier in the page table.

The foregoing description of the preferred embodiments is intended to more clearly illustrate the features and advantages of the present invention. However, the disclosed preferred embodiments are not intended to limit the scope of the present invention. On the contrary, the purpose of the present invention is to cover various modifications and equivalent arrangements within the scope of the appended claims.

Claims (9)

A high speed computer system power on and power off method comprising:
When the computer system enters the hibernation, the computer system separates the main memory into a plurality of clean pages and a plurality of dirty pages, and the clean pages are swapped out without I / O access, and the dirty pages are stored in a hibernation file And stored in at least a swap space and a file system of the secondary storage device, wherein the secondary storage device is a high speed random access memory device;
Reading the habitation file from the swap space and the file system and restoring the hibernation file to the main memory when the computer system is reactivated; And
The computer system reading data from the secondary storage device and loading the data into the main memory. The method according to claim 1,
Wherein in the step of the computer system entering the hibernation, the clean pages are swapped out and the main memory is released. 3. The method of claim 2,
Wherein the main memory is provided with a kernel function, wherein the kernel function is used to control swap out of the clean pages, and after completion of the swap out of the clean pages, The high speed computer system power-on and power-off method. The method of claim 3,
Wherein the kernel function is capable of calculating the number of clean pages to be swapped out and allocating the main memory based on the number of clean pages. The method according to claim 1,
Wherein the secondary storage device is a flash memory. The method according to claim 1,
Wherein in the step of the computer system entering the hibernation, the computer system uses a section as a unit in partitioning the main memory. The method according to claim 1,
Wherein the secondary storage device is provided with a copy having the same contents as the content of the clean page. The method according to claim 1,
Wherein the swapped-out dirty pages are sorted according to their addresses, the dirty pages of consecutive addresses are incorporated into a single write function, and the recordable combo writing-combing the high-speed computer system. delete

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