JPH05120086A - Management system for logging data - Google Patents

Abstract

PURPOSE:To prevent such trouble that a part of a displayed picture disappears because data is generated in the course of the read-out of a buffer, and reads out logging data whose number exceeds buffer capacity in the case that logging data recorded in a cyclic buffer to be used by overwriting new data when it is filled up with old data is read out and displayed on a display screen. CONSTITUTION:A first register 7 to hold information showing whether a data transmission line 6 is being used or not and show it to a CPU 9, and a second register 8 to hold the information showing whether the data of the maximum number of the cases capable of being stored in the cyclic buffer 1 are logged or not, and show it to the CPU 9 are provided, and when the CPU 9 detects that the transmission line 6 of the logging data is being used by the information of the first register 7, and detects that the maximum number of the cases capable of being stored in the cyclic buffer 1 are logged by the information of the second register 8, a read-out device 5 does not read out more than the capacity of the buffer 1, but reads out and displays the just whole capacity even when event data to be logged is generated in the course of the read-out of the data from the cyclic buffer 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a logging data management system for recording failure information of events controlled by a CPU on a memory for management. It is desired to record the state information recognized by the software in the memory (logging) in order to efficiently isolate the failure information and the like of the CPU controlled event. For this reason, a part of the system memory is secured as an area for logging and used as a logging buffer. However, if the buffer is full with data because the buffer memory area is limited, the old data will be overwritten. Is overwritten with new data and the buffer is used cyclically.

[0002]

2. Description of the Related Art A conventional logging data management system is
As shown in FIG. 4, a recording processing unit 3 for writing data into the buffer 1 and a reading processing unit 4 for reading data from the buffer 1
And did not deal with each other and did their own work independently.
However, since the buffer 1 is cyclically used as described above, when the reading processing unit 4 finishes reading the recorded data at the start of reading, the recording processing unit 3 records the data generated during the reading. If it continues, read processing unit
4 will read the recorded data continuously,
The reading process of 4 is not completed.

[0003]

Conventionally, as described above,
Even if the reading processing unit 4 finishes reading the data at the start of reading, if the recording processing unit 3 continues to record the generated data during the reading, the reading process does not end and the maximum capacity that can be stored in the buffer 1 More data than that amount is sent to the reading device 5 through the transmission line 6, and part of the display screen of the reading device 5 disappears. To prevent this, the CPU
There was a problem saying that I had to stop. The purpose of the present invention is to overwrite logging data recorded in a so-called cyclic buffer which is used cyclically by overwriting old data when it is filled with old data, and to display it by reading buffer 1 It is possible to prevent the occurrence of data to be logged during the reading of the data from the recording device, and to prevent the recorded data from being read out and transmitted to the reading device 5 in a number exceeding the maximum capacity of the buffer.
The display screen of 5 is to realize a logging data management system that can normally display the read data of buffer 1.

[0004]

The basic configuration of the present invention for achieving this object is shown in the principle diagram of FIG. In the figure, 1 is CP
It is a cyclic buffer for recording logging data of U-controlled events. Reference numeral 2 is a logging data detector that detects event data to be logged. A logging data recording processing unit 3 writes and records the event data detected by the logging data detection unit 2 into the cyclic buffer 1. A read processing unit 4 reads out the logging data recorded in the cyclic buffer 1. Reference numeral 5 is a logging data reading device for displaying and storing the logging data read from the cyclic buffer 1 on the screen. A data transmission line 6 transfers data between the logging data reading processing unit 4 and the logging data reading device 5. 7 is a first register newly established in the present invention,
Holds information whether the data transmission line 6 is in use or not
As shown in PU 9. Reference numeral 8 is also a newly established second register, which holds information as to whether or not the maximum number of items that can be stored in the cyclic buffer 1 has been logged and is shown to the CPU 9. 9 is a CPU that controls each processing unit
Is.

[0005]

In the present invention, as shown in the process flow chart of FIG.
Upon receiving the recording request from the logging data recording processing unit 2, the PU (9) checks whether or not the maximum number of data is stored in the buffer 1 based on the information held in the second register 8. If NO is not stored for the maximum number of records, recording is permitted, and YE is stored for the maximum number of records.
If S, the information held in the first register 7 is used to check whether the data transmission path 6 is in use. If YES in use, the record is rejected and NO in use
If so, allow overwriting the oldest data. Therefore, if the maximum number of data is recorded in the buffer 1 while reading the logging data,
Since it is no longer possible to write and record new data, even if the data is read online, the maximum number of data that can be recorded in buffer 1 is transferred to data reading device 5 via transmission line 6 and displayed on reading device 5's display screen. It will not disappear in part.

[0006]

FIG. 3 is a block diagram of an information processing apparatus of a logging data management system according to an embodiment of the present invention. In the figure, the same components as those shown in FIG. 1 are designated by the same symbols,
Reference numeral 10 denotes a system memory RAM of the CPU 9, which stores a logging data detection unit 2, a logging data recording processing unit 3, and a logging data reading processing unit 4, and allocates a part of them to the cyclic buffer 1. . In normal operation, the event data detected by the detection unit 2 is recorded in the buffer 1. According to the information stored in the second register 8, the buffer 1
When it knows that is full, it checks whether the transmission path 6 is in use by the information held in the first register 7,
When in use, stop recording data and stop reading data. Then, the full capacity of buffer 1 is read and the screen is displayed normally. In the above embodiment, each processing unit 2, 3,
4 is stored in RAM 10, but read-only RO
Needless to say, it may be stored in M.

[0007]

As described above, according to the present invention, when logging data is read online to the reading device and displayed, even if data to be logged occurs during reading data from the buffer, the buffer data is stored in the buffer. Since the data larger than the capacity is not written and read, the screen display of the read data is not partially erased, and the effect of facilitating the use of the logging data for fault isolation and the like can be obtained.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a basic configuration of a logging data management system of the present invention.

FIG. 2 is a flow chart of processing of the logging data management system of the present invention.

FIG. 3 is a block diagram of an information processing device of the logging data management system according to the embodiment of this invention.

FIG. 4 is a block diagram of a conventional logging data management system.

[Explanation of symbols]

1 is a cyclic buffer, 2 is a data detection unit, 3 is a recording processing unit, 4 is a reading processing unit, 5 is a reading device, 6 is a data transmission path, 7 and 8 are registers, and 9 is a CPU.

Claims (1)

[Claims] 1. A cyclic buffer for logging in which the data of the event of CPU (9) control is recorded in a buffer used cyclically by overwriting the new data when it is filled with old data. (1) and a logging data detector that detects event data to be logged (2),
Recording processing unit (3) for writing and recording event data detected by the logging data detection unit into the cyclic buffer
A read processing unit (4) for reading the logging data recorded in the cyclic buffer, a data transmission line (6) for transmitting the data read from the cyclic buffer, and the transmitted logging data. In a logging data management system having a reading device (5) for displaying and storing on a screen, a first register (shown by the CPU) which holds information as to whether the data transmission path (6) is in use or not. 7) and a second register (8) for holding the information indicating whether or not the maximum number of cases that can be stored in the cyclic buffer (1) is logged and showing to the CPU,
The PU (9) can detect that the logging data transmission path (6) is in use by the information of the first register (7), and can store it in the cyclic buffer (1) by the information of the second register (8). If it is detected that the maximum number of events has been logged, even if event data to be logged occurs while reading data from the cyclic buffer (1), the reading device
A logging data management system, wherein (5) reads and displays the full capacity of the buffer (1) without reading more than the capacity.