CN102761439B - Device and method for detecting and recording abnormity on basis of watchdog in PON (Passive Optical Network) access system - Google Patents
Device and method for detecting and recording abnormity on basis of watchdog in PON (Passive Optical Network) access system Download PDFInfo
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Abstract
The invention discloses a device and a method for detecting and recording abnormity on the basis of a watchdog in a PON (Passive Optical Network) access system. The device comprises a hardware watchdog, a software watchdog, a log recording module and a CLI (Command-Line Interface), wherein the software watchdog comprises a configuration management module, a task state detection module and a CPU (Central Processing Unit) utilization ratio detection module; the task state detection module is connected with the log recording module and used for polling the task sate of the system; the CPU utilization ratio detection module is connected with the hardware watchdog and used for detecting the CPU utilization ratio of the system; the task state detection module is communicated with the CPU utilization ratio detection module through a pipeline communication mode; the software watchdog is used for outputting a reset signal to a hardware watchdog timer at regular time; and when abnormity is detected, a zone bit is set, zero clearing is stopped by the log recording module after the abnormal information is recorded by the log recording module, a master control panel is reset, and changeover is triggered. According to the invention, a master panel is automatically reset to recover a system service when the master control panel is abnormal, and the abnormal data is recorded before resetting, which is beneficial to positioning faults.
Description
Technical field
The present invention relates to PON (Passive Optical Network, EPON) connecting system field, particularly relate to abnormality detection tape deck and method based on house dog in a kind of PON connecting system.
Background technology
House dog is divided hardware watchdog and software watchdog.Hardware watchdog is a timer circuit, and its timing output is connected to the reset terminal of circuit, program within the scope of certain hour to timer zero clearing (be commonly called as " feed dog ").When program is normally worked, timer can not overflow, and also just can not produce reset signal.If program breaks down, the house dog that do not reset in timing cycle, just makes WatchDog Timer overflow, and produces the reset signal starting system of laying equal stress on.The same in software watchdog principle, just the timer circuit of hardware is replaced with the timer internal of processor, can simplify hardware circuit design, but be not so good as hardware timer aspect reliability, for example internal system timer self breaks down and just cannot detect.By hardware watchdog and software watchdog, mutually monitor in addition simultaneously, not only strengthen overhead, can not solve whole issue, for example interrupt system fault causes timer to interrupt losing efficacy.
House dog itself is not the problem occurring for resolution system, and the fault of finding in debug process should be looked into the mistake that changes design itself.The object that adds house dog be to the factors such as some program latent faults and adverse circumstances interference cause system in case of system halt and in unmanned intervention situation automatic recovery system normal operating conditions, the loss that house dog can not avoid fault to cause completely, after all from finding that fault slows down in system reset recovers normally during this period of time.
In the protection system of application watchdog function, how when breaking down, resetting in time recovery system business is soon generally the emphasis of this protection mechanism of design, and has often ignored problem itself.Along with EPON (Ethernet Passive Optical Network, Ethernet passive optical network) extensive use of equipment, the applied environment of equipment also becomes increasingly complex, once cause for some reason unit exception, when main control unit is abnormal without without human intervention in the situation that, for example webmaster is de-manages, protocol processes is abnormal etc., the house dog master that automatically resets, just a kind of method of recovery system resets, the data of fault in-situ have often been destroyed, be unfavorable for that program development personnel check phenomenon and locate fault, the consequence of bringing is like this exactly thoroughly to solve the problem of appearance, the problem having occurred is occurred repeatedly, the system that affects is used.
Summary of the invention
The object of the invention is in order to overcome the deficiency of above-mentioned background technology, abnormality detection tape deck and method based on house dog in a kind of PON connecting system are provided, master automatically resets without without human intervention in the situation that when main control unit is abnormal, timely recovery system business, reduce user's loss, and the field data when recording problem occurring before trigger resetting, being conducive to software developer analyzes phenomenon and locates fault, for analysis and solve problem provides important foundation, be conducive to improve the quality of software.
Abnormality detection tape deck based on house dog in PON connecting system provided by the invention, comprise hardware watchdog timer and software watchdog Abort Timer, also comprise logger module and Command Line Interface, task status detection module and cpu busy percentage detection module that described software watchdog Abort Timer comprises Configuration Manager, is connected with Configuration Manager respectively, Configuration Manager is connected with Command Line Interface, task status detection module is connected with logger module, for polling system task status; Cpu busy percentage detection module is connected with hardware watchdog timer, and for detection of system CPU utilance, the mode by pipeline communication between task status detection module and cpu busy percentage detection module communicates; While feeding dog, by software watchdog Abort Timer, regularly to hardware watchdog timer, export a reset signal; Flag bit of set when system exception being detected, after the abnormal information of logger module register system, stops feeding dog, and reset main control unit also triggers and switches.
Based on said apparatus, abnormality detection recording method based on house dog in PON connecting system provided by the invention, comprise the following steps: when S1, initialization, create software watchdog Abort Timer and monitor task, regularly to hardware watchdog timer output reset signal, and enable hardware watchdog timer and start working; The state of monitor task automatic regular polling system task, while the abnormal task of hang-up being detected, task call function track before recording exceptional daily record and task suspension, stops " feeding dog " flag bit set, makes hardware watchdog timer expiry and restart main control unit triggering to switch; S2, software watchdog Abort Timer be detection system cpu busy percentage regularly, if the time that cpu busy percentage is 100% surpasses the time threshold of configuration, the task call function track before recording exceptional daily record and task suspension, then control master and restart triggering masterslave switchover.
In technique scheme, the Abort Timer of software watchdog described in step S1 was exported a reset signal every 0.5 second to hardware watchdog timer.
In technique scheme, monitor task described in step S1 is every the state of 3 minutes poll primary system tasks.
In technique scheme, the flow process of the state of the task of polling system described in step S1 is as follows: time delay 3 minutes, select operation, the size of alternative operation return value, operates return value if select and equals 0, polling tasks state, while having task suspension, logger task track, stops feeding the set of dog flag bit, enters circulation next time; While there is no task suspension, enter circulation next time; If select operation return value to be greater than 0, read the ID that pipeline obtains abnormal task, the name of logger task and task track, stop feeding the set of dog flag bit, enters circulation next time; If select operation return value to be less than 0, judge and select to make mistakes, enter circulation next time.
In technique scheme, in step S2, system task occupies extremely for a long time cpu resource and does not discharge, and while causing low priority task cannot obtain cpu resource completing corresponding function, systems soft ware provides the task of high priority to carry out detection system cpu busy percentage.
In technique scheme, the flow process of the cpu busy percentage of detection system described in step S2 is as follows: restarting software watchdog timer, is not 0 if feed dog flag bit, stops feeding dog, treats hardware watchdog timer expiry, and rear end is restarted in master control; If feeding dog flag bit is 0, feed dog reset hardware watchdog timer, if global variable changes, counter O reset, restarts counting, waits for software watchdog timer expiry, after software watchdog timer expiry, restart software watchdog timer, enter circulation next time; If global variable is constant, counter adds 1, if Counter Value reaches threshold value, check CPU current task ID, hang up this task and notify task status detection module simultaneously, wait for software watchdog timer expiry, after software watchdog timer expiry, restart software watchdog timer, enter circulation next time; If Counter Value does not reach threshold value, wait for software watchdog timer expiry, after software watchdog timer expiry, restart software watchdog timer, enter circulation next time.
In technique scheme, in step S2, during detection system cpu busy percentage, every 0.5s, check the situation of change of global variable " innerIDLE ", if this global variable changed in 0.5 second, by recording cpu busy percentage, continue 100% time variable zero setting, restart record.
Compared with prior art, advantage of the present invention is as follows:
The present invention not only when main control unit is abnormal without without human intervention in the situation that (such as the de-pipe of webmaster, protocol processes abnormal etc.) master automatically resets, thereby timely recovery system business, reduce user's loss, and the field data when recording problem occurring before trigger resetting, being conducive to software developer checks phenomenon and locates fault, for analysis and solve problem provides important foundation, be conducive to improve the quality of software.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the abnormality detection tape deck based on house dog in PON connecting system in the embodiment of the present invention.
Fig. 2 is the flow chart of polling system task status in the embodiment of the present invention.
Fig. 3 is the flow chart that detects cpu busy percentage in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 1, abnormality detection tape deck based on house dog in PON connecting system in the embodiment of the present invention, comprise hardware watchdog timer, software watchdog, logger module and CLI (Command-Line Interface, Command Line Interface), software watchdog comprises Configuration Manager, the task status detection module being connected with Configuration Manager respectively and CPU (Central Processing Unit, central processing unit) utilance detection module, Configuration Manager is connected with CLI, task status detection module is connected with logger module, for polling system task status, cpu busy percentage detection module is connected with hardware watchdog timer, and for detection of system CPU utilance, the mode by pipeline communication between task status detection module and cpu busy percentage detection module communicates.By software watchdog Abort Timer, every 0.5s, to hardware watchdog timer, export a reset signal; While by flag bit of set, comes control program to stop " feeding dog " when system exception being detected, to reach reset main control unit and to trigger the object of switching.Reset is the shortcut of recovery business, can not thoroughly deal with problems, for can helper applications developer orientation problem better, embodiment of the present invention logger module before reset is also wanted the abnormal information of register system.
The embodiment of the present invention provides a kind of abnormality detection tape deck and the method based on house dog in PON connecting system, comprises the following steps:
S1, when system initialization, create software watchdog Abort Timer, every 0.5s, to a reset signal of hardware watchdog timer output, enable hardware watchdog timer simultaneously, make it to start working.Main control unit hardware provides hardware watchdog timer circuit, and the in the situation that of " not feeding dog " within a period of time, main control unit can reset.The software of main control unit, by systems soft ware WatchDog Timer timing output " hello dog " signal, resets to hardware watchdog timer, guarantees not trigger reset when system is normal.Software watchdog timer is an Abort Timer of system, can guarantee also can " feed dog " in time when system busy.When system initialization, create a monitor task, the state of this monitor task all tasks in 3 minutes poll primary systems, if find that there is task abnormity, will stop " feeding dog " flag bit set, to control software, stop " feeding dog ", thereby make hardware watchdog timer expiry and restart main control unit.Some task occurs abnormal and hangs up in the process of operation, in the time of can not responding user's request or correct processing protocol message again, abnormal task detected over time, and triggers and switch.
S2, detection system cpu busy percentage.In software watchdog Abort Timer, except wanting regularly " feeding dog ", also will detect main control unit cpu busy percentage, anti-locking system is because certain causes cpu busy percentage for a long time in 100% extremely, and affects systemic-function.The time threshold of cpu busy percentage 100%, can, according to the situation configuration of concrete system, if the time that cpu busy percentage is 100% surpasses the time threshold of configuration, control master and restart triggering masterslave switchover.Some task abnormity of system and occupy for a long time cpu resource and do not discharge, while causing low priority task cannot obtain cpu resource completing the situation of corresponding function, software provides the task of high priority to detect, and adopts system break timer regularly to detect cpu busy percentage.
During detection system cpu busy percentage, every 0.5s, check the situation of change of global variable " innerIDLE ", if this global variable changed in 0.5 second, by recording cpu busy percentage, continue 100% time variable zero setting, restart record." innerIDLE " variable is added 1 in system idle task (priority is 255), if this task can not get cpu resource for a long time, illustrative system is busy.
S3, system exception detected and restarting before main control unit triggers and switch, the problem log that records as much as possible, the task call function track of logger task before hanging up, can facilitate developer to search problem in detail, is the preferred approach of convenient location fault.
Shown in Figure 2, the flow process of polling system task status is as follows:
Step 101, time delay 3 minutes;
Step 102, selection operation;
The size of step 103, alternative operation return value, if equal 0, forwards step 104 to; If be greater than 0, forward step 109 to; If be less than 0, forward step 111 to;
If step 104 is selected operation, return value equals 0, polling tasks state;
Step 105, the task that judged whether, in suspended state, if had, forward step 106 to; Otherwise forward step 108 to;
Step 106, logger task track, forward step 107 to;
Step 107, stop feeding the set of dog flag bit, forward step 108 to;
Step 108, enter next time circulation, forward step 101 to;
If step 109 is selected operation, return value is greater than 0, reads the ID that pipeline obtains abnormal task, forwards step 110 to;
The name of step 110, logger task, forwards step 106 to;
If step 111 is selected operation, return value is less than 0, judges and selects to make mistakes, and forwards step 108 to.
Shown in Figure 3, the flow process of detection system cpu busy percentage is as follows:
Step 201, restart software watchdog timer;
Step 202, judgement feed whether dog flag bit is 0, if feed dog flag bit, are not 0, forward step 203 to; If feeding dog flag bit is 0, forward step 205 to;
If it is not 0 that step 203 is fed dog flag bit, stop feeding dog, forward step 204 to;
Step 204, hardware watchdog timer expiry, master control is restarted, and finishes;
If it is 0 that step 205 is fed dog flag bit, feed dog reset hardware watchdog timer, forward step 206 to;
Step 206, judge whether global variable changes, if global variable changes, forward step 207 to; If global variable is constant, forward step 208 to;
If step 207 global variable changes, counter O reset, restarts counting, forwards step 211 to;
If step 208 global variable is constant, counter adds 1, forwards step 209 to;
Step 209, judge whether Counter Value reaches threshold value, if Counter Value reaches threshold value, forward step 210 to; If Counter Value does not reach threshold value, forward step 211 to;
If step 210 Counter Value reaches threshold value, check CPU current task ID, hang up this task and notify task status detection module simultaneously, forward step 211 to;
Step 211, wait software watchdog timer expiry, forward step 212 to;
Step 212, software watchdog timer expiry, return to step 201.
Abnormal log before reset is recorded as the important evidence that problem analysis provides, and plays considerable effect in equipment protection.The specific implementation of abnormal log record and cpu busy percentage abnormal two aspects explanation abnormal from system task below resets:
(1) when task status detection module detects and has task abnormity in system (task is in " hang-up " state), record this task ID, calling task track following function logger task is carried out track simultaneously, the task track obtaining in this way can very clearly reflect that this task is at " hang-up " front execution function track, the required important information of these trace informations program development personnel positioning just problem.Get after task track, then calling system log pattern write log interface, the trace information of this task is write to FLASH (flash memory), so just can guarantee system reset after error message can not lose.After this dish reset is restarted, by FTP (File Transfer Protocol, file transfer protocol (FTP)) mode, derive the log information in FLASH, the function invocation track in the time of just conveniently understanding task abnormity, for problem analysis provides important evidence.
(2) cpu busy percentage detection module detects cpu busy percentage when 100% time surpasses the threshold value arranging, by system call, can obtain easily the abnormal task ID that takies cpu resource, after getting the ID of abnormal task, by this task suspension, with recovery system cpu busy percentage, to normal, be worth, object is to prevent that this task priority is too high, cause task detection module can not obtain cpu resource, and cannot record the abnormal information of this task, the ID of this task is write in the pipeline of opening up in advance simultaneously, to facilitate task detection module to get abnormal task ID by pipeline.Task status detection module reads in pipeline after the ID of abnormal task, by the name of this task and track record to FLASH.Logger task name information is the log information when distinguishing task suspension, allows program development personnel know and is which kind of is abnormal, facilitates the location of fault.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention, within if of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention comprises these changes and modification interior.The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. the abnormality detection tape deck based on house dog in a PON connecting system, comprise hardware watchdog timer and software watchdog Abort Timer, it is characterized in that: also comprise logger module and Command Line Interface, task status detection module and cpu busy percentage detection module that described software watchdog Abort Timer comprises Configuration Manager, is connected with Configuration Manager respectively, Configuration Manager is connected with Command Line Interface, task status detection module is connected with logger module, for polling system task status; Cpu busy percentage detection module is connected with hardware watchdog timer, and for detection of system CPU utilance, the mode by pipeline communication between task status detection module and cpu busy percentage detection module communicates; While feeding dog, by software watchdog Abort Timer, regularly to hardware watchdog timer, export a reset signal; Flag bit of set when system exception being detected, after the abnormal information of logger module register system, stops feeding dog, and reset main control unit also triggers and switches; During initialization, create software watchdog Abort Timer and monitor task, regularly to hardware watchdog timer output reset signal, and enable hardware watchdog timer and start working; The state of monitor task automatic regular polling system task, while the abnormal task of hang-up being detected, task call function track before recording exceptional daily record and task suspension, stops " feeding dog " flag bit set, makes hardware watchdog timer expiry and restart main control unit triggering to switch; Software watchdog Abort Timer is detection system cpu busy percentage regularly, if the time that cpu busy percentage is 100% surpasses the time threshold of configuration, the task call function track before recording exceptional daily record and task suspension, then control master and restart triggering masterslave switchover.
2. the abnormality detection recording method based on house dog in the PON connecting system based on device described in claim 1, is characterized in that comprising the following steps:
When S1, initialization, create software watchdog Abort Timer and monitor task, regularly to hardware watchdog timer output reset signal, and enable hardware watchdog timer and start working; The state of monitor task automatic regular polling system task, while the abnormal task of hang-up being detected, task call function track before recording exceptional daily record and task suspension, stops " feeding dog " flag bit set, makes hardware watchdog timer expiry and restart main control unit triggering to switch;
S2, software watchdog Abort Timer be detection system cpu busy percentage regularly, if the time that cpu busy percentage is 100% surpasses the time threshold of configuration, the task call function track before recording exceptional daily record and task suspension, then control master and restart triggering masterslave switchover.
3. the abnormality detection recording method based on house dog in PON connecting system as claimed in claim 2, is characterized in that: the Abort Timer of software watchdog described in step S1 was exported a reset signal every 0.5 second to hardware watchdog timer.
4. the abnormality detection recording method based on house dog in PON connecting system as claimed in claim 3, is characterized in that: monitor task described in step S1 is every the state of 3 minutes poll primary system tasks.
5. the abnormality detection recording method based on house dog in PON connecting system as claimed in claim 4, it is characterized in that: the flow process of the state of the task of polling system described in step S1 is as follows: time delay 3 minutes, select operation, the size of alternative operation return value, operates return value if select and equals 0, polling tasks state, while having task suspension, logger task track, stops feeding the set of dog flag bit, enters circulation next time; While there is no task suspension, enter circulation next time; If select operation return value to be greater than 0, read the ID that pipeline obtains abnormal task, the name of logger task and task track, stop feeding the set of dog flag bit, enters circulation next time; If select operation return value to be less than 0, judge and select to make mistakes, enter circulation next time.
6. the abnormality detection recording method based on house dog in PON connecting system as claimed in claim 2, it is characterized in that: in step S2, system task occupies extremely for a long time cpu resource and do not discharge, while causing low priority task cannot obtain cpu resource completing corresponding function, systems soft ware provides the task of high priority to carry out detection system cpu busy percentage.
7. the abnormality detection recording method based on house dog in PON connecting system as claimed in claim 6, it is characterized in that: the flow process of the cpu busy percentage of detection system described in step S2 is as follows: restart software watchdog timer, if feeding dog flag bit is not 0, stop feeding dog, treat hardware watchdog timer expiry, rear end is restarted in master control; If feeding dog flag bit is 0, feed dog reset hardware watchdog timer, if global variable changes, counter O reset, restarts counting, waits for software watchdog timer expiry, after software watchdog timer expiry, restart software watchdog timer, enter circulation next time; If global variable is constant, counter adds 1, if Counter Value reaches threshold value, check CPU current task ID, hang up this task and notify task status detection module simultaneously, wait for software watchdog timer expiry, after software watchdog timer expiry, restart software watchdog timer, enter circulation next time; If Counter Value does not reach threshold value, wait for software watchdog timer expiry, after software watchdog timer expiry, restart software watchdog timer, enter circulation next time.
8. the abnormality detection recording method based on house dog in PON connecting system as claimed in claim 7, it is characterized in that: in step S2 during detection system cpu busy percentage, every 0.5s, check the situation of change of global variable " innerIDLE ", if this global variable changed in 0.5 second, by recording cpu busy percentage, continue 100% time variable zero setting, restart record.
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