JPH03125237A - Memory dump collection system - Google Patents

Abstract

PURPOSE:To shorten the time required for restart of a memory dump collection system by performing the greater part of a memory dump collection process to be carried out at the end of the system abnormality in parallel with other processes after the system is restarted. CONSTITUTION:A 1st memory dump collection means 1 writes the contents of a memory area 61 of a memory 6 which has the capacity necessary for a system restart process into an area 71 of a memory dump collection file 7. At the same time, a 2nd memory dump collection means 3 writes the contents of the other memory area 62 of the memory 6 into an area 72 of the file 7 respectively. The succession information 4 and the memory state information 5 are stored in the memory 6. A memory state initialization means 2 and the means 3 refer to the information 4 set by the means 1. Then the information 5 which is initialized by the means 2 is updated by the means 3. In such a constitution, the time required for restart of a memory dump collection system is shortened at the end of the system abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a memory dump collection method when a computer system terminates abnormally.

[Conventional technology]

Generally, in a computer system, when the OS (operating system) detects a system abnormality, the system is restarted after collecting a memory dump as data for analyzing the cause of the system abnormality. Conventionally, the following method is used to collect a memory dump when a system terminates abnormally.

(1) Collect all memory images of virtual memory (including virtual pages that do not exist on main memory).

(2) Collect all memory images of main memory.

- [Problem to be solved by the invention] In (2) of the prior art described above, in analyzing the cause of abnormal system termination, it is possible to utilize the fact that there is a high possibility that images of virtual pages that do not exist in main memory are unnecessary. This reduces the amount of memory dump collection. However, as computer systems become larger in scale, the installed main memory is also becoming larger in capacity, so even with this method, restarting the system after an abnormal system termination is delayed due to memory dump collection. There is a problem with that.

[Means to solve the problem]

The memory dump collection method of the present invention is used when collecting a memory dump when the system terminates abnormally in a computer system, and when the system terminates abnormally.

a first memory dump means that collects a memory dump for an amount of memory area necessary for system restart processing, and stores information indicating a memory area where the memory dump has been collected and a memory dump collection file area as inheritance information; and a system abnormality. When restarting the system after completion of the process, based on the takeover information recorded by the first memory dump means, the memory areas for which memory dumps have been collected are made available for use, and the memory areas for which memory dumps have not been collected are made available. , the memory usage status initialization means initializes the memory usage state to an unusable state, and after the system restart process is completed, the memory dump is not collected based on the takeover information recorded by the first memory dumping means. and a second memory dump means for changing the memory use state for which a memory dump has not been collected for the memory area from the unusable state set by the memory use state initializing means to the usable state. There is.

〔Example〕

Two examples of the present invention will be described below.

Referring to FIG. 1, the memory dump collection method according to the present invention includes a first memory dump collection means 1, a memory state initialization means 2, a second memory dump collection means 3, takeover information 4, and a memory state. Information 5 is provided. The first memory dump collection means 1 collects the contents of the memory area 61 in the memory 6 in an amount necessary for system restart processing, and the second memory dump collection means 3 collects the contents of the remaining memory area 62 in the memory 6. , area 71 in memory dump collection file 7, respectively.
．． Write to 72. Handover information 4 and memory status information 5
exists in the memory 6, and the takeover information 4 set by the first memory dump collection means 1 is stored in the memory state initialization means 2.
and is referenced by the second memory dump means 3, and
The memory state information 5 initialized by the memory state initialization means 2 is updated by the second memory dump means 3.

In this embodiment, the memory dump collection file 7 is assumed to be a file on the Shiki disk device.

It is also possible to implement collection on other media such as magnetic tape.

Referring also to FIG. 2, 6-a to 6-f in FIG. 1 show the usage state in the memory 6 at a certain point in time during the memory dump operation.

Furthermore, the shaded area in FIG. 1 indicates the state in which the memory image remains at the time of abnormal system termination.

When the O8 detects a system abnormality, control is passed to the first memory dump collection means 1. First memory dump collection means 1
to the memory dump collection file area 71.

Memory dump collection is performed only for the amount of memory area 61 necessary for system restart processing. At this point.

The memory state at the time of abnormal system termination (except for the memory area used by the first memory dump collection means 1 to collect the memory dump) is all preserved (the memory state is shown in Figure 2-6).
8). The first memory dump collecting means l is.

Next, information indicating the memory area 61 (starting memory address, ending memory address) and information indicating the file area 71 (starting file address, ending 7 isle address)
is written in the takeover information area 4 secured in the memory area 61, and finally, the system restart processing program is loaded into the memory area 61 and control is transferred (the memory state is shown in FIG. 6-b in FIG. 2). Since the amount of memory in the memory area 61 is very small compared to the amount of memory in the entire memory 6, control is transferred to system restart processing faster than in the prior art.

The system restart processing program performs initialization processing (re-creation of the OS control table, OS control file recovery, startup of system processes, etc.) until the O8 main unit is ready for operation, but some of this processing is As a result, the memory state information 5 is recreated by the memory state initializing means 2. Here, the memory state information 5 is.

This is a table that manages the status of each page (real memory page) in the memory 6, and has information indicating whether each page (4-) can be used or not. The memory state initialization means 2 refers to the memory dump collected memory area information in the handover information 4, and sets the memory state information such that some pages belonging to the memory area 61 are in a usable state and pages belonging to the memory area 62 are in an unusable state. Initialize 5. However, regarding the memory area of the system restart program itself, the memory area of the takeover information 4, and the memory status information 5, the memory area 61
However, since it is already in use, the corresponding page is changed to an unusable state (memory usage state is shown in FIG. 2, 6-c).

After that, O8 will be re-created during the system restart process.
The memory area of the control table is allocated based on the memory state information 5 (inevitably, it is allocated within the memory area 61). Finally, the system restart program starts the system processes and
The memory area of the system restart processing program itself is released (memory usage status is shown in FIG. 2, 6-d).

The second memory data collecting means 3 is one of the system processes.
It is started as one. At this point, the memory contents of the memory dump uncollected area 62 are preserved as they were at the time of system abnormal termination, and the remaining memory dump collection processing can be performed in parallel with other processing. The second memory dump collecting means 3 refers to the memory area information and file area information of which the memory dump has been collected in the handover information 4.

A memory dump is collected from the memory area 62 to the file area 72. For memory areas for which memory dump collection has been completed, the change to the usable state is performed on the memory status information 5 at any time without waiting for the completion of all memory dump collection (memory usage status is shown in Figure 2, 6-e). to 6-f).

〔Effect of the invention〕

As explained above, in the present invention, most of the memory dump collection processing when the system terminates abnormally can be performed in parallel with other processing after restarting the system. This makes it possible to significantly reduce the time required.

Figure 1

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a diagram for explaining the operation of this embodiment. 1... First memory dump collection means, 2... Memory state initialization means, 3... Second memory dump collection means. 4... Handover information, 5... Memory status information, 6...
・Memory, 7...Memory dump collection file, 61 and 62...Partial area of memory 6, 71 and 72.
・Me East 2 1-1111”

Claims (1)

[Claims] 1. Used when collecting a memory dump when the system terminates abnormally in a computer system, and when the abnormal system termination occurs, the memory dump is collected for the amount of memory area necessary for system restart processing. , a first memory dump means for recording information indicating the memory area where the memory dump has been collected and the memory dump collection file area as inheritance information; and recording by the first memory dump means during system restart processing after abnormal system termination. memory usage state initializing means for initializing the memory usage state of a memory area for which a memory dump has been collected to a usable state and for a memory area for which a memory dump has not been collected to an unusable state based on the inherited information; When the system restart process is completed, a memory dump is collected for the memory area for which no memory dump has been collected based on the takeover information recorded by the first memory dump means, and the memory usage state of the area is changed from the unusable state. A memory dump collection method comprising: a second memory dump means for changing the memory to a usable state.