JP2009140293A - System analyzer, memory dump acquisition method and memory dump acquisition program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire a memory dump without stopping a calculator. <P>SOLUTION: In the system analyzer, memory management information for managing a storage region is stored in a main storage. In the case of receiving a write request to the storage region in which the memory dump is acquired, the system analyzer newly allocates a storage region different from the storage region in which the memory dump is acquired, adds the memory management information corresponding to the newly allocated storage region, determines whether or not the newly allocated storage region corresponding to the storage region in which the memory dump is acquired is present on the basis of the memory management information in receiving a memory dump acquisition request, and acquires information stored in the newly allocated storage region as the memory dump when the newly allocated storage region corresponding to the storage region in which the memory dump is acquired is present. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for acquiring a memory dump.

  When a failure occurs in the computer, a method of acquiring a memory dump is used to analyze the cause of the failure.

  As a method of acquiring a memory dump, in order to avoid changes in memory contents due to processing other than memory dump acquisition processing during memory dump acquisition, all processing other than memory dump acquisition processing is stopped and only memory dump acquisition processing is performed. Techniques for performing are disclosed. However, when all processes other than the memory dump acquisition process are stopped, the memory dump cannot be acquired except when a failure occurs or when the system is restarted.

Therefore, Patent Document 1 discloses a technique that allows the computer to continue processing even while a memory dump is being acquired.
JP-A-10-154087

  In the technique disclosed in Patent Document 1, when a write command is received during acquisition of a memory dump, if the free memory exists, the contents of the memory are copied to the free memory so that the processing of the computer can be continued. ing.

  However, when a plurality of operating systems (OS) are operating on one computer, it is difficult to apply the technique disclosed in Patent Document 1.

  In a typical embodiment of the present invention, a system analysis apparatus in a computer system, wherein the system analysis apparatus includes a central processing unit, a main storage device, and an external storage device, and the main storage device is the main storage device. Storing memory management information for managing the storage area allocated to the storage system, wherein the computer system includes a memory dump acquisition unit for acquiring a memory dump of the storage area allocated to the main storage device, and acquiring the memory dump The unit stores the memory dump in the external storage device, and when the central processing unit receives a write request for the storage area from which the memory dump is acquired, the memory dump is acquired. A new storage area is allocated to the main storage device, and the memory dump is allocated to the newly allocated storage area. When the memory dump acquisition request is accepted, the memory management information corresponding to the newly allocated storage area is added. Based on the information, it is determined whether or not the newly allocated storage area exists corresponding to the storage area from which the memory dump is acquired, and corresponds to the storage area from which the memory dump is acquired, If there is a newly allocated storage area, the information stored in the newly allocated storage area is acquired as a memory dump.

  According to an embodiment of the present invention, a memory dump for each storage area can be acquired. Therefore, even in a computer in which a plurality of OSs are executed, a memory for each OS can be obtained without stopping the system analysis apparatus. A dump can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a configuration diagram of a system analysis apparatus according to the first embodiment of this invention.

  The system analysis apparatus according to the first embodiment of the present invention includes a central processing unit 10, a main storage device 20, and an external storage device 40. The central processing unit 10, the main storage device 20, and the external storage device 40 are connected by a bus 50.

  The central processing unit 10 executes various programs by executing various programs stored in the main storage device 20. Specifically, the central processing unit 10 executes an operating system 12, a memory management unit 11 that manages a memory state, a memory dump acquisition unit 31, and the like. In the system analysis apparatus, a single system may be operating, a plurality of systems may be operating in parallel, and a plurality of OSs 12 may be executed.

  The main storage device 20 stores a program executed by the central processing unit 10 and data used by the program. Specifically, the main storage device 20 stores memory management information 21, an OS memory 22, and a dump memory 23 in addition to programs such as the OS 12, the memory management unit 11, and the memory dump acquisition unit 31. Yes.

  The memory management unit 11 is executed when the system analysis apparatus is activated. The memory management unit 11 manages a storage area (memory) used by a system operating in the system analysis apparatus. When a new program is executed in the system analysis apparatus, it is registered in the memory management unit 11 and a memory is allocated to execute the program.

  The OS 12 is an operating system in which a system running on the system analysis apparatus is executed. When a plurality of systems are operating in the system analysis device, a storage area is allocated to the main storage device 20 for each system (OS 12).

  The memory dump acquisition unit 31 may be realized as an application executed on the OS 12 or as a module executed in the OS 12. Further, it may be realized as software executed separately from the OS 12, or may be realized as software or hardware executed by a computer different from the system analysis apparatus.

  The memory management information 21 stores the state of the memory. Details of the memory management information 21 will be described later with reference to FIG.

  The OS memory 22 is a storage area used by each OS 12 executed by the system analysis apparatus.

  The dump memory 23 is a storage area for saving the OS memory 22 at the start of memory dump acquisition. The dump memory 23 may be allocated to the OS memory 22 or may be allocated separately from the OS memory 22. In the first embodiment of the present invention, the dump memory 23 is allocated to an area different from the OS memory 22 as shown in FIG.

  When the dump memory 23 is allocated to the OS memory 22, it is conceivable to allocate the dump memory 23 at the same time as the OS memory 22 is allocated at the timing when the execution of each OS 12 is started by the memory management unit 11. In this case, a different dump memory 23 is used when acquiring a memory dump of each OS 12.

  On the other hand, when the dump memory 23 is allocated to the main storage device 20 separately from the OS memory 22, the memory management unit 11 preliminarily stores the dump memory 23 based on information preset by a definition file or the like or the state of the OS memory 22. It is possible to assign. In this case, the same dump memory 23 is used when acquiring the memory dump of each OS 12.

  This is the end of the description of the overall configuration of the system analysis apparatus according to the first embodiment of this invention. Next, details of the memory management information 21 will be described.

  FIG. 2 illustrates a memory management table 211 that is an example of the memory management information 21 according to the first embodiment of this invention.

  The memory management table 211 includes a domain ID 2111, a virtual logical address 2112, a real physical address 2113, a busy flag 2114, a dump flag 2115, and an update flag 2116. In the memory management table 211, a record is created for each memory allocated to the main storage device 20.

  The domain ID 2111 is an identifier for identifying the OS 12 that uses the memory corresponding to the record.

  The virtual logical address 2112 is an address of a storage area used by the OS 12. The virtual logical address 2112 is a virtual address assigned by the OS 12.

  The real physical address 2113 is an address used by the memory management unit 11. The real physical address 2113 is an address uniquely specified for all memories.

  The in-use flag 2114 manages the use state of the memory. The dump flag 2115 manages whether or not the memory is in a save state during memory dump acquisition.

  The update flag 2116 manages the update state after acquiring the memory dump. That is, when a memory dump is acquired, the value of the update flag 2116 is set to “off”, and when the memory contents are updated after the memory dump is acquired, “on” is set.

  This is the end of the description of the memory management table 211 that is the memory management information in the first embodiment of the present invention. Next, details of processing by each configuration will be described.

  FIG. 3 is a flowchart illustrating a procedure of the memory dump acquisition process executed in the system analysis apparatus according to the first embodiment of this invention.

  When the central processing unit 10 receives a memory dump acquisition request from the OS 12, the central processing unit 10 executes the memory dump acquisition unit 31, and notifies the memory management unit 11 of the start of memory dump acquisition of the OS 12 that is the memory dump acquisition target (S101).

  The central processing unit 10 registers the memory dump acquisition unit 31 notified of the start of memory dump acquisition in the memory management unit 11 by the memory management unit 11 (S110).

  The central processing unit 10 implements write protection on the OS memory 22 corresponding to the OS 12 for which a memory dump is acquired (S111). Here, the write protection may be realized by a function of the central processing unit or the main storage device, or may be realized by processing of the memory management unit 11 by registering information in the memory management table 211.

  The central processing unit 10 notifies the memory dump acquisition unit 31 that the preparation for acquiring the memory dump of the target OS 12 for acquiring the memory dump is completed (S112).

  The central processing unit 10 instructs the memory management unit 11 to read out the memory of the OS 12 from which the memory dump is acquired by using the memory dump acquisition unit 31 (S102). Here, the processing of S102 may be realized by the processing of the memory management unit 11 intercepting the memory read command of the OS 12 that is the target of acquiring the memory dump of the memory dump acquisition unit 31.

  When the received read instruction is an instruction from the memory dump acquisition unit 31 registered in the process of S110, the central processing unit 10 performs the following on all of the memory to be read by the memory management unit 11. The processing from S114 to S1171 or the processing from S114 to S1172 is repeatedly executed (S113). The repetition unit may be for each memory, or for each of a plurality of memories partitioned into a predetermined size.

  The central processing unit 10 acquires information about the memory read from the memory management table 211 by the memory management unit 11 (S114).

The central processing unit 10 determines whether or not the value of the dump flag 2115 of the information acquired in the process of S114 is “ON” (S115).
When the value of the dump flag 2115 is “ON” (the result of S115 is “ON”), the central processing unit 10 stores the value in the dump memory 23 of the main storage device 20 based on the value of the real physical address 2113. The read information is read (S1161). Further, the memory read in the process of S1161 is released (S1171). Specifically, the write protection of the memory for which the dump memory is acquired is canceled, the domain ID 2111 and the virtual logical address 2112 are initialized for the record of the memory management table 211 corresponding to the memory, the in-use flag 2114, The dump flag 2115 and the update flag 2116 are set to OFF.

  On the other hand, when the value of the dump flag 2115 is “off” (the result of S115 is “off”), the central processing unit 10 has not created the dump memory 23 and therefore based on the value of the real physical address 2113. Then, the information stored in the OS memory 22 is read (S1162).

  The central processing unit 10 releases the write protection of the memory read in the process of S1162, and sets the value of the update flag 2116 of the record of the memory management table 211 corresponding to the memory to “off” (S1172). .

  When the processing for all the target memories is completed, the central processing unit 10 transmits the memory information read in the processing of S1161 or S1162 to the memory dump acquisition unit 31 by the memory management unit 11 (S118). .

  The central processing unit 10 uses the memory dump acquisition unit 31 to save the memory information transmitted in the process of S118 in the external storage device 40 (S103). Further, the end of the memory dump acquisition process is notified to the memory management unit 11 (S104).

  The central processing unit 10 cancels the registration of the memory dump acquisition unit 31 that is a notification source of the completion of memory dump acquisition (S110).

  In the flowchart shown in FIG. 3, the memory dump acquisition unit 31 acquires the memory information corresponding to the OS 12 (S102 to S103) at one time. It may be divided and repeated.

  This is the end of the description of the memory dump acquisition process according to the first embodiment of this invention. Next, the memory dump difference acquisition process will be described.

  FIG. 4 is a flowchart illustrating a procedure of a memory dump difference acquisition process executed in the system analysis apparatus according to the first embodiment of this invention.

  The memory dump difference acquisition process is different from the memory dump acquisition process shown in FIG. 3 in that a dump is acquired only for the updated memory. Specifically, the processing of S101, S111, S112, and S102 is changed to the processing of S121, S131, S132, and S122. Hereinafter, the memory dump difference acquisition process will be described focusing on the changed process.

  The central processing unit 10 executes the memory dump acquisition unit 31 and notifies the memory management unit 11 of the start of acquisition of the memory dump difference of the OS 12 that is the memory dump (difference) acquisition target (S121).

  The central processing unit 10 uses the memory management unit 11 to perform write protection on the memory for which the memory dump is acquired, in which the value of the update flag 2116 of the corresponding record in the memory management table 211 is “ON”. (S131).

  The central processing unit 10 notifies the memory dump acquisition unit 31 that preparation for acquiring the memory dump difference of the target OS 12 from which the memory dump is acquired has been completed (S132).

  The central processing unit 10 instructs the memory management unit 11 to read out the memory of the target OS 12 from which the memory dump difference is acquired by the memory dump acquisition unit 31 (S122).

  As described above, by acquiring the memory dump only when the contents of the memory are updated, it is possible to shorten the time for acquiring the necessary memory dump.

  This is the end of the description of the memory dump difference acquisition processing according to the first embodiment of this invention.

  Here, when there are a plurality of targets for acquiring the memory dump, the time required to record the memory information acquired in the external storage device 40 in the process of S103 may become a bottleneck. Further, if the writing speed is high and a large-capacity external storage device is used, the cost increases.

  This problem can be solved by mounting the external storage device 40 in which the memory information is stored in the process of S103 with a plurality of external storage devices having different writing speeds. Specifically, the external storage device that is directly written by the memory dump acquisition unit 31 is a storage device that has a small capacity and can be written at high speed, while the external storage device that stores the memory dump for a long time is a large capacity and low speed storage device And By mounting in this way, it is possible to reduce the time for storing the acquired memory dump in the external storage device 40 while suppressing the realization cost. Furthermore, it is possible to reduce the capacity required for the dump memory 23 for saving the OS memory 22 during the memory dump acquisition process or the memory dump difference acquisition process.

  FIG. 5 is a flowchart illustrating the procedure of the OS memory update process executed in the system analysis apparatus according to the first embodiment of this invention.

  This process is a memory update process to the OS memory 22 used by the OS 12 that is a target for acquiring a memory dump during the memory dump acquisition process or the memory dump difference acquisition process.

  The central processing unit 10 instructs the memory management unit 11 to write to the memory area using the OS 12 (S141). The process of S141 may be realized by the memory management unit 11 intercepting a memory write command of the OS 12.

  The central processing unit 10 repeatedly executes the following processing from S152 to S156 for all the write target memories by the memory management unit 11 (S151). The repetition unit may be for each memory, or for each of a plurality of memories partitioned into a predetermined size.

  The central processing unit 10 determines whether the memory to be written has been write-protected by the memory management unit 11 (S152). Here, the write protection check may be realized by the function of the central processing unit 10 or the main storage device 20 in conjunction with the write protection of the S111 process of FIG. 3 or the S131 process of FIG. It may be realized by the memory management unit 11 by registering information in the memory management unit 11.

  If the memory is write-protected (the result of S152 is “Yes”), the central processing unit 10 newly allocates another memory to the main storage device 20 (S153). Here, another memory allocation may be realized by the function of the central processing unit 10 or the main storage device 20, or may be realized by the memory management unit 11 based on the memory management table 211. Further, the information stored in the write target memory is copied to another allocated memory.

  The central processing unit 10 sets the dump flag 2115 of the record corresponding to the write-protected memory in the memory management table 211 to “ON” by the memory management unit 11. Then, the domain ID of the OS 12 is set in the domain ID 2111 corresponding to the separately allocated memory, the virtual logical address corresponding to the memory write-protected in the virtual logical address 2112 is set, and the in-use flag 2114 is set. “ON” is set (S154).

  The central processing unit 10 is instructed to write to the main storage device 20 from the OS 12 when the processing of S154 is completed or when the memory is not write-protected (the result of S152 is “No”). Information is written (S155). If the memory is write protected (the result of S152 is “Yes”), the instructed information is written to the newly allocated memory. If the memory is not write protected (the result of S152 is “No”), the instructed information is written to the OS memory 22.

  The central processing unit 10 sets the value of the update flag 2116 of the record corresponding to the memory written in S155 of the memory management table 211 to “ON” by the memory management unit 11 (S156).

  By executing the above memory update process, even when data is written to the OS memory 22 during the memory dump acquisition process or the memory dump difference acquisition of the OS memory 22 used by the OS 12, the memory dump The starting memory can be saved.

  According to the first embodiment of the present invention, it is possible to acquire a memory dump of the OS memory 22 read / written by the OS 12 without stopping the OS 12 while the memory dump acquisition process is started. Further, the memory dump difference of the OS memory 22 belonging to the OS 12 can be acquired without stopping the OS 12 while the memory dump difference acquisition process is started.

  Further, according to the first embodiment of the present invention, the memory read processing by the memory dump acquisition unit can be used without changing the conventional memory dump acquisition unit.

  Furthermore, according to the first embodiment of the present invention, the memory dump is acquired at regular intervals, and during that period, the difference between the memory dumps is acquired, thereby reducing the amount of memory dump acquisition and the analysis data frequently. Can be collected.

  According to the first embodiment of the present invention, since a memory dump can be acquired simultaneously for a plurality of systems operating in a distributed system, not only the analysis target system but also the related system memory A dump can also be used to analyze the system.

  According to the first embodiment of the present invention, the memory dump acquisition unit 31 is provided outside the system analysis apparatus, and a plurality of system analysis apparatuses are requested to acquire a memory dump at the same time. System memory dump can be acquired at the same time.

(Second Embodiment)
In the first embodiment of the present invention, when a write request is received during memory dump acquisition, a memory dump is acquired without suspending the OS 12 by allocating another storage area to the main storage device 20. The method was explained. In the second embodiment of the present invention, a case where the main storage device is duplicated will be described.

  Note that in the second embodiment of the present invention, description of the contents common to the first embodiment of the present invention will be omitted as appropriate.

  FIG. 6 is a configuration diagram of a system analysis apparatus according to the second embodiment of this invention.

  The system analysis apparatus according to the second embodiment of the present invention is obtained by multiplexing the main storage device 20 of the system analysis apparatus according to the first embodiment of the present invention. The difference from the system analysis apparatus according to the first embodiment of the present invention is that the main storage device 20 is replaced with a primary main storage device 201 and a sub main storage device 202.

  The primary main storage device 201 stores primary memory management information 25 for storing the state of the primary memory, and further, an OS primary memory 221 used by each OS 12 executed in the system analysis device is allocated. .

  The secondary main storage device 202 stores secondary memory management information 26 for storing the state of the secondary memory, and further, an OS secondary memory 222 corresponding to each OS 12 executed by the system analysis device is allocated. Therefore, the OS sub memory 222 also corresponds to the OS primary memory 221.

  Further, the OS primary memory 221 and the OS secondary memory 222 are synchronized. The synchronization between the OS primary memory 221 and the OS sub memory 222 may be realized by the memory management unit 11 or may be realized as an application operating on the OS 12. Further, it may be realized as a module that operates in the OS 12 or may be realized as software executed by the central processing unit 10 separately from the memory management unit 11, and may be executed by a processing device different from the central processing unit 10. It may be realized as software or hardware. Further, the primary main storage device 201 may have one secondary main storage device 202 or a plurality of secondary main storage devices 202.

  This is the end of the description of the overall configuration of the system analysis apparatus according to the second embodiment of this invention. Next, details of each component will be described.

  FIG. 7 illustrates a primary memory management table 251 that is an example of the primary memory management information 25 according to the second embodiment of this invention.

  The primary memory management table 251 includes a domain ID 2111, a virtual logical address 2112, a real physical address 2113, a busy flag 2114, and an update flag 2116. In the primary memory management table 251, a record is created for each memory (storage area) allocated to the primary main storage device 201.

  The domain ID 2111, the virtual logical address 2112, the real physical address 2113, the in-use flag 2114, and the update flag 2116 have the same application as the memory management table 211 according to the first embodiment of this invention.

  FIG. 8 is a diagram illustrating the sub memory management table 261 that is an example of the sub memory management information 26 according to the second embodiment of this invention.

  The secondary memory management table 261 has the same configuration as the primary memory management table 251. A memory corresponding to the memory allocated to the primary main storage device 201 is allocated to the secondary main storage device 202, and the stored contents are synchronized. In the secondary memory management table 261, a record is created for each memory allocated to the secondary main storage device 202. Therefore, each record in the secondary memory management table 261 also corresponds to the memory allocated to the primary main storage device 201.

  The description of the primary memory management table 251 as an example of the primary memory management information 25 and the secondary memory management table 261 as an example of the secondary memory management information 26 according to the second embodiment of the present invention is finished. Subsequently, processing of each configuration will be described.

  FIG. 9 is a flowchart illustrating a procedure of a memory dump acquisition process executed in the system analysis apparatus according to the second embodiment of this invention.

  When the central processing unit 10 receives a memory dump acquisition request from the OS 12, the central processing unit 10 executes the memory dump acquisition unit 31 and notifies the memory management unit 11 of the start of memory dump acquisition of the OS 12 subject to memory dump acquisition (S201).

  The central processing unit 10 causes the memory management unit 11 to stop synchronization between the OS primary memory 221 corresponding to the OS 12 that acquires the memory dump and the OS secondary memory 222 corresponding to the OS primary memory 221 (S211). ).

  The central processing unit 10 notifies the memory dump acquisition unit 31 that the preparation for acquiring the memory dump of the target OS 12 for acquiring the memory dump is completed (S212).

  The central processing unit 10 instructs the memory management unit 11 to read out the memory of the target OS 12 from which the memory dump is acquired by using the memory dump acquisition unit 31 (S202). Here, the process of S202 may be realized by the process of the memory management unit 11 intercepting the memory read command of the OS 12 that is the target of acquiring the memory dump of the memory dump acquisition unit 31.

  The central processing unit 10 causes the memory management unit 11 to repeatedly execute the following processes of S216 and S217 on all the memories to be read (S213). The repetition unit may be for each memory, or for each of a plurality of memories partitioned into a predetermined size.

  The central processing unit 10 reads the information stored in the OS sub memory 222 of the sub main storage device 202 by the memory management unit 11 (S216). Further, the value of the update flag 2116 included in the record of the sub memory management table 261 corresponding to the memory read in the process of S216 is set to “off” (S217).

  When the above processing is completed for all the target memories from which the memory dump is acquired, the central processing unit 10 sends the memory information read out by the memory management unit 11 in the processing of S216 to the memory dump acquisition unit 31. Transmit (S218).

  The central processing unit 10 uses the memory dump acquisition unit 31 to store the memory information received in the processing of S218 in the external storage device (S203).

  On the other hand, the central processing unit 10 is the OS primary memory 221 used by the OS 12 for which a memory dump is acquired, and the value of the update flag 2116 of the corresponding record in the primary memory management table 251 is “ON”. The following processes from S262 to S265 are executed on the memory by the memory management unit 11 (S261). The execution target may be for each memory or for each of a plurality of memories partitioned into a predetermined size.

  The central processing unit 10 uses the memory management unit 11 to store the memory in which the value of the update flag 2116 of the corresponding record (in this case, the OS primary memory 221) from the primary main storage device 201 is “ON”. Information is read (S262).

  Next, the central processing unit 10 sets the value of the update flag 2116 of the record corresponding to the memory read out in the processing of S262 of the primary memory management table 251 to “off” by the memory management unit 11 (S263). .

  The central processing unit 10 identifies the OS sub memory 222 synchronized with the OS main memory 221 to be processed by the memory management unit 11, and the memory read to the identified OS sub memory 222 by the process of S262. Is written (S264). Specifically, the OS sub memory 222 is specified based on the domain ID 2111, the virtual logical address 2112, and the real physical address 2113 of the OS primary memory 221 to be processed.

  The central processing unit 10 sets the update flag 2116 of the record in the sub memory management table 261 corresponding to the OS sub memory 222 in which information is written in the process of S264, to “ON” by the memory management unit 11 (S265). .

  When the repetition of S261 ends, the central processing unit 10 resumes the synchronization between the OS primary memory 221 used by the OS 12 for which the memory dump has been acquired and the corresponding OS sub memory 222 (S266).

  This is the end of the description of the memory dump acquisition process according to the second embodiment of this invention. Next, the memory dump difference acquisition process will be described.

  FIG. 10 is a flowchart illustrating a procedure of memory dump difference acquisition processing executed in the system analysis apparatus according to the second embodiment of this invention.

  The memory dump difference acquisition process is different from the memory dump acquisition process shown in FIG. 9 in that a dump is acquired only for the updated memory. Specifically, the processing of S201, S211, S212, and S202 is changed to the processing of S221, S231, S232, and S222. Hereinafter, the memory dump difference acquisition process will be described focusing on the changed process.

  The central processing unit 10 executes the memory dump acquisition unit 31 and notifies the memory management unit 11 of the start of acquiring the memory dump difference of the OS 12 that is the memory dump (difference) acquisition target (S201).

  The central processing unit 10 is an OS submemory 222 corresponding to the OS primary memory 221 corresponding to the OS 12 from which the memory management unit 11 acquires a memory dump by the memory management unit 11, and a record update flag corresponding to the submemory management table 261 The OS sub memory 222 whose value 2116 is “ON” is stopped from synchronizing with the OS primary memory 221 (S231).

  The central processing unit 10 notifies the memory dump acquisition unit 31 that the preparation for acquiring the memory dump difference of the target OS 12 from which the memory dump is acquired is completed (S232).

  The central processing unit 10 instructs the memory management unit 11 to read the updated memory of the OS 12 that is the target of acquiring the memory dump difference by using the memory dump acquisition unit 31 (S222). The process of S202 may be realized by the process of the memory management unit 11 intercepting the memory read command of the OS 12 that is the target of acquiring the memory dump of the memory dump acquisition unit 31.

  As described above, by acquiring the memory dump only when the contents of the memory are updated, it is possible to shorten the time for acquiring the necessary memory dump. This is the end of the description of the memory dump difference acquisition processing according to the second embodiment of this invention.

  As described in the first embodiment of the present invention, the external storage device in which the memory dump is directly written by the memory dump acquisition unit 31 is a storage device that can be written at a small capacity and at high speed, and the memory dump is stored for a long time. By setting the external storage device to be a large-capacity and low-speed storage device, it is possible to reduce the time for storing the acquired memory dump in the external storage device 40 while suppressing the realization cost. Therefore, it is possible to shorten the period during which the synchronization between the OS primary memory 221 and the OS sub memory 222 is stopped.

  FIG. 11 is a flowchart illustrating a procedure of OS memory update processing executed in the system analysis apparatus according to the second embodiment of this invention.

  This process is a memory update process to the OS primary memory 221 that is used by the OS 12 that is the target of acquiring the memory dump during the memory dump acquisition process or the memory dump difference acquisition process.

  The central processing unit 10 instructs the memory management unit 11 to write to the memory area through the OS 12 (S141). The process of S141 may be realized by the memory management unit 11 intercepting a memory write command of the OS 12.

  The central processing unit 10 repeatedly executes the following processes from S252 to S256 or S252 to S221 on all the write target memories by the memory management unit 11 (S251). The repetition unit may be for each memory, or for each of a plurality of memories partitioned into a predetermined size.

  The central processing unit 10 determines whether the synchronization between the OS primary memory 221 used by the OS 12 and the corresponding OS secondary memory 222 is performed by the memory management unit 11 (S252). The processing of S252 is performed if write protection is performed on the memory dump acquisition target memory (in this case, the OS main memory 221) of the primary main storage device 201 at the time of memory dump acquisition processing or memory dump difference acquisition. It is also possible to determine whether or not write protection is performed on the target memory.

  When the central processing unit 10 determines that the synchronization between the OS primary memory 221 and the corresponding OS secondary memory 222 has not been performed (the result of S252 is “Yes”), the corresponding primary main storage device 201 The designated information is written in the OS primary memory 221 (S2551).

  Subsequently, the central processing unit 10 sets the record update flag 2116 of the primary memory management table 251 corresponding to the memory in which information is written in the process of S255 to “ON” (S256).

  On the other hand, when the central processing unit 10 determines that the synchronization between the OS primary memory 221 and the corresponding OS secondary memory 222 is performed (the result of S252 is “Yes”), the primary main storage device 201 The designated information is written in the OS primary memory 221 (S2552).

  After the execution of the write process to the OS primary memory 221 in S2552, the OS secondary memory 222 of the secondary main storage device 202 is updated by the synchronization of the OS primary memory 221 and the OS secondary memory 222. Information is written (S271). Further, the value of the update flag 2116 of the record in the sub memory management table 261 corresponding to the memory in which information is written in the processing of S271 is set to “ON” (S272).

  According to the second embodiment of the present invention, similarly to the first embodiment of the present invention, the memory dump acquisition process of the memory dump of the OS sub memory 222 corresponding to the OS 12 is performed without stopping the OS 12. It can be acquired in the starting state.

  In the second embodiment of the present invention, the following effects can be obtained in addition to the effects of the first embodiment of the present invention.

  According to the second embodiment of the present invention, it is possible to reduce the overhead of writing to the OS main memory 221 of the OS 12 during the memory dump acquisition process or the memory dump difference acquisition process.

  According to the second embodiment of the present invention, the dump memory 23 for evacuating the OS primary memory 221 is not required during the memory dump acquisition process or the memory dump difference acquisition process. Capacity can be reduced.

(Third embodiment)
As in the second embodiment of the present invention, the third embodiment of the present invention has a configuration in which the main storage device is duplicated. The second embodiment of the present invention is different from the processing in the case where the information stored in the OS primary memory 221 is stored during the memory dump acquisition. Hereinafter, a third embodiment of the present invention will be described.

  The configuration of the system analysis apparatus according to the third embodiment of the present invention is the same as that of the system analysis apparatus according to the second embodiment of the present invention shown in FIG.

  Also, the primary memory management information 25 and the secondary memory management information 26 according to the third embodiment of the present invention are the same as the primary memory management table 251 and the secondary memory management table 261 shown in FIGS.

  FIG. 12 is a flowchart illustrating a procedure of a memory dump acquisition process executed in the system analysis apparatus according to the third embodiment of this invention.

  The difference from the memory dump acquisition process of the second embodiment of the present invention shown in FIG. 9 is that the processes from S261 to S266 are deleted after the process of S218, and the process of S217 and the process of S218 are different. In the meantime, the processing from S361 to S367 is added. Hereinafter, the procedure of the memory dump acquisition process according to the third embodiment of the present invention will be described focusing on the differences.

  When the processing of S217 is completed, the central processing unit 10 has the domain ID 2111 and the virtual logical address corresponding to the memory read by the memory management unit 11 from the primary memory management table 251 in the processing of S216 of the secondary memory management table 261. Based on 2112 and the real physical address 2113, a record corresponding to the OS primary memory 221 of the primary main storage device 201 to be synchronized is acquired (S361).

  The central processing unit 10 determines whether the value of the update flag 2116 of the record acquired in the process of S361 is “on” or “off” by the memory management unit 11 (S362).

  When the value of the update flag 2116 is “ON” (the result of S362 is “ON”), the central processing unit 10 uses the memory management unit 11 to store information from the OS main memory 221 of the primary main storage device 201. Is read (S363).

  The central processing unit 10 sets the value of the update flag 2116 of the record of the primary memory management table 251 read in the process of S363 to “off” by the memory management unit 11 (S364). Further, the information read from the OS primary memory 221 in the process of S363 is written into the OS secondary memory 222 of the corresponding secondary main storage device 202 (S365).

  The central processing unit 10 sets the record update flag 2116 of the sub memory management table 261 corresponding to the OS sub memory 222 in which information is written in the process of S365 to “on” by the memory management unit 11 (S366). .

  When the process of S367 is completed or the value of the update flag 2116 is “off” (the result of S362 is “off”), the central processing unit 10 reads information in the process of S363. The synchronization between the OS primary memory and the corresponding OS secondary memory 222 is resumed (S367).

  This is the end of the description of the memory dump acquisition process according to the third embodiment of this invention. Next, the memory dump difference acquisition process will be described.

  FIG. 13 is a flowchart illustrating a procedure of a memory dump difference acquisition process executed in the system analysis apparatus according to the third embodiment of this invention.

  The memory dump difference acquisition process is different from the memory dump acquisition process shown in FIG. 9 in that a dump is acquired only for the updated memory. Specifically, the processing of S201, S211, S212, and S202 is changed to the processing of S221, S231, S232, and S222.

  Further, the processes of S221, S231, S232, and S222 are the same as the processes of S221, S231, S232, and S222 included in the memory dump difference acquisition process of the second embodiment of the present invention shown in FIG.

  Above, description of the memory dump difference acquisition process of the 3rd Embodiment of this invention is complete | finished.

  The memory update process for the OS primary memory 221 according to the third embodiment of the present invention is the same as the memory update process according to the second embodiment of the present invention shown in FIG.

  According to the third embodiment of the present invention, in addition to the effect of the second embodiment of the present invention, during the memory dump acquisition process or the memory dump difference acquisition process, the OS sub memory 222 of the OS 12 By reflecting the information in the OS primary memory 221 at the same time as reading the memory, the time for stopping the synchronization between the OS primary memory 221 and the OS sub memory 222 can be shortened.

It is a block diagram of the system analysis apparatus of the 1st Embodiment of this invention. It is a figure which shows the memory management table which is an example of the memory management information of the 1st Embodiment of this invention. It is a flowchart which shows the procedure of the memory dump acquisition process performed in the system analysis apparatus of the 1st Embodiment of this invention. It is a flowchart which shows the procedure of the memory dump difference acquisition process performed in the system analysis apparatus of the 1st Embodiment of this invention. It is a flowchart which shows the procedure of the memory update process of OS performed in the system analysis apparatus of the 1st Embodiment of this invention. It is a block diagram of the system analysis apparatus of the 2nd Embodiment of this invention. It is a figure which shows the primary memory management table which is an example of the primary memory management information of the 2nd Embodiment of this invention. It is a figure which shows the submemory management table which is an example of the submemory management information of the 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the memory dump acquisition process performed in the system analysis apparatus of the 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the memory dump difference acquisition process performed in the system analysis apparatus of the 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the memory update process of OS performed in the system analysis apparatus of the 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the memory dump acquisition process performed in the system analysis apparatus of the 3rd Embodiment of this invention. It is a flowchart which shows the procedure of the memory dump difference acquisition process performed in the system analysis apparatus of the 3rd Embodiment of this invention.

Explanation of symbols

10 Central Processing Unit 11 Memory Management Unit 12 Operating System (OS)
DESCRIPTION OF SYMBOLS 20 Main storage device 21 Memory management information 22 OS memory 23 Dump memory 25 Primary memory management information 26 Secondary memory management information 31 Memory dump acquisition part 40 External storage device 201 Primary main storage device 202 Secondary main storage device 211 Memory management table 221 OS Primary memory 222 OS secondary memory 251 primary memory management table 261 secondary memory management table

Claims (13)

A system analysis device for analyzing processing executed in a computer system,
The system analysis device includes a central processing unit, a main storage device, and an external storage device,
The main storage device stores memory management information for managing a storage area allocated to the main storage device,
The computer system includes a memory dump acquisition unit that acquires a memory dump that is information stored in the storage area,
The memory dump acquisition unit stores the memory dump in the external storage device;
The central processing unit is
When a write request is received for the storage area from which the memory dump is acquired, a storage area different from the storage area from which the memory dump is acquired is newly allocated to the main storage device,
Copy the information recorded in the storage area from which the memory dump has been acquired to the newly allocated storage area,
Add memory management information corresponding to the newly allocated storage area,
If the memory dump acquisition request is received, it is determined whether or not the newly allocated storage area corresponding to the storage area from which the memory dump is acquired exists based on the memory management information And
When there is a newly allocated storage area corresponding to the storage area from which the memory dump is acquired, the information stored in the newly allocated storage area is acquired as a memory dump. System analysis device. The memory management information includes information indicating whether or not the storage area allocated to the main storage device has been updated after the memory dump is acquired;
The system analysis apparatus according to claim 1, wherein the central processing unit acquires a memory dump from a storage area updated after the memory dump is acquired based on the memory management information. A plurality of operating systems are executed on the system analysis device,
The system analysis apparatus according to claim 1, wherein a storage area is allocated to the main storage device for each operating system.   The system analysis apparatus according to claim 1, wherein the memory management information includes information indicating whether or not a storage area allocated to the main storage device is acquiring a memory dump. The central processing unit is
When accepting the acquisition request of the memory dump, before starting the acquisition of the memory dump, prohibit the writing of the storage area from which the memory dump is acquired,
2. The system analysis apparatus according to claim 1, wherein it is determined whether or not the memory dump is being acquired based on whether or not writing to a storage area from which the memory dump is acquired is prohibited. .   6. The central processing unit according to claim 5, wherein the central processing unit determines whether or not the memory dump is being acquired based on whether or not the writing to the storage area from which the memory dump is acquired has succeeded. The system analysis device described. A system analysis device for analyzing processing executed in a computer system,
The system analysis device includes a central processing unit, a main storage device, and an external storage device,
The main storage device
Provide a storage area where information is read and written,
A primary main storage device, and a secondary main storage device that holds a copy of the information stored in the primary main storage device,
The secondary main storage device is synchronized to match the information stored in the primary main storage device;
The computer system includes a memory dump acquisition unit that acquires a memory dump that is information stored in the storage area,
The memory dump acquisition unit stores the memory dump in the external storage device;
The central processing unit is
When receiving the acquisition request of the memory dump, the first storage area allocated to the primary main storage device from which the memory dump is acquired, and the secondary main storage apparatus corresponding to the first storage area Stop synchronizing with the second storage area allocated to
Reading information stored in the second storage area;
Storing the information read from the second storage area in the external storage device;
A system analysis apparatus that resumes synchronization between the first storage area and the second storage area.   When the first storage area is updated during acquisition of the memory dump, the central processing unit stores the information stored in the first storage area and the second storage area. The system analysis apparatus according to claim 7, wherein the synchronization between the first storage area and the second storage area is resumed after matching the received information.   The central processing unit stores information read from the second storage area in the external storage device after the synchronization between the first storage area and the second storage area is resumed. The system analysis apparatus according to claim 7. The primary main storage device stores memory management information for managing the first storage area;
The memory management information includes information indicating whether the first storage area has been updated after the memory dump is acquired;
8. The system analysis apparatus according to claim 7, wherein the central processing unit acquires a memory dump from a storage area updated after the memory dump is acquired based on the memory management information. A plurality of operating systems are executed on the system analysis device,
The system analysis apparatus according to claim 7, wherein a storage area is allocated to the primary main storage device for each operating system. In a system analysis apparatus comprising a central processing unit, a main storage device and an external storage device, a method for obtaining a memory dump of a storage area allocated to the main storage device,
The main storage device stores memory management information for managing a storage area allocated to the main storage device,
The memory dump acquisition method is:
When a write request is received for the storage area from which the memory dump is acquired, a storage area different from the storage area from which the memory dump is acquired is newly allocated to the main storage device,
Copy the information recorded in the storage area from which the memory dump has been acquired to the newly allocated storage area,
Add memory management information corresponding to the newly allocated storage area,
If the memory dump acquisition request is received, it is determined whether or not the newly allocated storage area corresponding to the storage area from which the memory dump is acquired exists based on the memory management information And
When there is a newly allocated storage area corresponding to the storage area from which the memory dump is acquired, the information stored in the newly allocated storage area is acquired as a memory dump. Memory dump acquisition method. A program that is executed by a system analysis device including a central processing unit and a main storage device and acquires a memory dump of a storage area allocated to the main storage device,
The main storage device stores memory management information for managing a storage area allocated to the main storage device,
The memory dump acquisition program is:
When a write request is received for the storage area from which the memory dump has been acquired, a procedure for newly allocating a storage area different from the storage area from which the memory dump is acquired;
A procedure for copying the information recorded in the storage area from which the memory dump has been acquired to the newly allocated storage area;
Adding memory management information corresponding to the newly allocated storage area;
If the memory dump acquisition request is received, it is determined whether or not the newly allocated storage area corresponding to the storage area from which the memory dump is acquired exists based on the memory management information And the steps to
If there is a newly allocated storage area corresponding to the storage area from which the memory dump is acquired, a procedure for acquiring information stored in the newly allocated storage area as a memory dump; Is executed by the system analysis apparatus.

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