JPS63153650A - Memory dump system - Google Patents

Abstract

PURPOSE:To prevent the execution of a program other than a dump program from being kept waiting long by installing a write protection key to each memory block and giving a function outputting contents of a memory block to other storage device in a write protection exemption processing program. CONSTITUTION:A write protection key 6 is provided to each divided memory block 5 and if a mechanical interruption takes place in write protection exemption to rewrite the content of the memory block 5, a function outputting the content of the memory block 5 to other storage device 9 is provided in the write protection exemption processing program 7 receiving the control. The write protection exemption processing program 7 is to be dumped and started only when the content of the memory block 5 whose dump is not finished is to be changed to apply dump processing to the dump program. Thus, the delay in the execution of other program is suppressed to a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dump processing method for storing the contents of a memory within an information processing device in another storage device.

[Conventional technology]

FIG. 4 is a block diagram showing the configuration of a conventional memory dump method. In the figure, 1 is a CPU (central processing unit), which executes a plurality of programs 2 sequentially. A dump program 3 is included in the plurality of programs 2. 4 is a memory in which data to be dumped exists. Further, the memory 4 is divided into blocks of a fixed size, and each of the blocks is called a memory block 5. 8 is an output buffer for temporarily storing data to be dumped, and its size matches one memory block 5.

Reference numeral 9 denotes another storage device that stores the contents of the memory 4, such as a magnetic disk device.

FIG. 5 is a flowchart for explaining the operation of the dump program in the memory dump method of FIG. 4.

Next, the operation of the conventional memory dump method shown in FIG. 4 will be described with reference to FIG. 5.

First, when there is a dump request, the dump program 3
Set the PUI to an interrupt-disabled state (step 10 in Figure 5).
). This prohibits the execution of other programs 2. This is to prevent other programs 2 from changing the contents of the memory 4 to be dumped. Next, the dump program 3 once copies the contents of one memory block 5 to the output buffer 8 (step 11 in FIG. 5), and then outputs it to the magnetic disk device 9 (step 12 in FIG. 5). This process is repeated for all memory blocks 5 to be dumped (steps 17 and 18 in FIG. 5). When the processing for all memory blocks 5 is completed, the CPU is set to an interrupt enabled state (step 14 of the fifth cause), other programs 2 are allowed to be executed, and the dump processing of the dump program 3 is completed.

[Problem that the invention seeks to solve]

In the conventional memory dump method described above, execution of other programs 2 is prohibited while the dump program 3 is performing dump processing, so if the size of the memory 4 to be dumped is large, a long There was a frequent problem that the execution of other programs 2 was delayed.

This invention was made in order to solve this problem, and the purpose is to obtain a memory dump method that can suppress the delay in execution of other programs to a short time even when rewriting the contents of a memory block. do.

[Means for solving problems]

The memory dump method according to the present invention installs a write protection key in each divided memory block, and takes control of write protection exception processing when a write protection exception machine interrupt occurs to rewrite the contents of the memory block. This is a program that has a function to output the contents of a memory block to another storage device.

[Effect]

In the IJ dump method of this invention, the write protection exception handling program is activated only when the contents of a memory block that should be dumped and has not been completely dumped is started, and the write protection exception handling program Perform processing.

〔Example〕

FIG. 1 is a block diagram showing the configuration of a memory dump method which is an embodiment of the present invention. In the figure, 1 is the CPU
(central processing unit), which executes a plurality of programs 2 sequentially. A dump program 3 is included in the plurality of programs 2. 4 is a memory in which data to be dumped exists. Further, the memory 4 is divided into blocks of a fixed size, and each of the blocks is called a memory block 5.

One write protection key 6 exists in one memory block 5. 7 is a write IM exception handling program that is executed when a certain program 2 causes a machine interrupt of a write protection exception. 8 is an output buffer for temporarily storing data to be dumped, and its size matches one memory block 5. Reference numeral 9 designates another storage device that stores the contents of the memory 4, that is, a storage device that stores the results of dump processing, such as a magnetic disk device.

2 is a flowchart for explaining the operation of the write protection exception handling program in the memory dump method of FIG. 1, and FIG. 3 is a flowchart for explaining the operation of the dump program for the memory dump method of FIG. 1. It is.

Next, the operation of the memory dump system, which is an embodiment of the present invention shown in FIG. 1, will be explained with reference to FIGS. 2 and 3. First, write protection exception handling program 7
The operation will be explained.

This write protection exception handling program 7 is executed when a program 2 attempts to rewrite the contents of the memory block 5 to which the write hold key 6 is set and a write protection exception machine interrupt occurs. . The write protection exception handling program 7 first places the CPUI in an interrupt disabled state (step 10 in FIG. 2), then copies the contents of the memory block 5 where the write protection exception has occurred to the output buffer 8 (step Step 11 in Figure 2)
, output to the magnetic disk device 9 (step 1 in Fig. 2).
2). After that, the write protection key 6 of the memory processor 5 in which the write protection exception occurred is removed (step 13 in Figure 2), and CPUI interrupts are enabled (step 14 in Figure 2), and the operation ends. . After this operation is completed, the program 2 that caused the write protection exception re-executes the instruction that caused the write protection exception. At this time, since the write protection key 6 is not set in the corresponding memory block 5, a machine interrupt due to a write protection exception does not occur, and the program 2 can continue executing instructions.

Next, the operation of the dump program 3 will be explained. First, when there is a dump request, the dump program 3
Set the UI to interrupt-disabled state (step 10 in Figure 3)
. Next, after setting the write protection keys 6 in all memory blocks 5 to be dumped (step 1 in FIG.
5), enable interrupts for CPU1 (step 1 in Figure 3).
4).

Subsequently, the dump program 3 dumps one memory block 5
A portion of the contents is read and the same data is immediately written (step 16 in FIG. 3). At this time, whether the write protection key 6 is set in the corresponding memory block 5 depends on the operation of other programs 2. If another program 2 has not rewritten the contents of the corresponding memory block 5, the write protection key 6 is set, so the dump program 3 causes a machine interrupt of a write protection exception. Then, as described above, the write protection exception handling program 7 is activated, outputs the contents of the corresponding memory block 5 to the magnetic disk device 9, and removes the write protection key 6 of the corresponding memory block 5. Next, dump program 3
When the memory block 5 operates, no machine interrupt due to a write protection exception occurs for the corresponding memory block 5. On the other hand, if another program 2 has rewritten the contents of the corresponding memory block 5, the write protection exception handling program 7 has already operated on the corresponding memory block 5, and the write protection key 6
has been removed, so dump program 3 does not cause a machine interrupt for the write protection exception. After the dump program 3 performs the above processing for one memory block 5, it repeats the same processing for a different memory block 5 (steps 17 and 18 in FIG. 3). When processing for all memory programs 5 to be dumped is completed, the dump program 3 ends the dump processing.

In the above embodiment, the dump program 3 writes data into the memory block 5. However, the state of the write protection key 6 of the corresponding memory block 5 is checked, and if it is set, write protection exception handling is performed. Program 7 may also be executed.

Further, in the above embodiment, only one output buffer 8 was provided, but a plurality of output buffers 8 may be provided.

[Effects of the Invention] As explained above, in the memory dump method, this invention installs a write protection key in each divided memory block, and when a machine interrupt of a write protection exception occurs to rewrite the contents of the memory block, The write protection exception handling program that receives control has a function to output the contents of the memory block to another storage device, so the execution of programs other than the dump program will not have to wait for a long time. This has an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a memory dump method that is an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of a write mining exception handling program in the memory dump method of FIG. 3 is a flowchart for explaining the operation of the dump program in the memory dump method of FIG. 1, FIG. 4 is a block diagram showing the configuration of the conventional memory dump method, and FIG. 5 is a flowchart for explaining the operation of the dump program in the memory dump method of FIG. 4. 3 is a flowchart for explaining the operation of a dump program in the method. In the figure, 1, 1...CPU (central processing unit), 2...
...Program, 3...Dump program, 4...
Memory, 5...Memory block, 6...Write protection key, 7...Write protection exception handling program, 8...
・Output buffer, 9...Magnetic disk-i location, 10~
18...Step. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] The memory to be dumped is divided into several memory blocks, a write protection key is provided for each memory block, and when a machine interrupt of a write protection exception occurs to rewrite the contents of the memory block, the memory is A memory dump method characterized by dumping the contents of blocks.