CN101178662A - Monitoring method of embedded LINUX applications progress - Google Patents
Monitoring method of embedded LINUX applications progress Download PDFInfo
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- CN101178662A CN101178662A CNA2006100635414A CN200610063541A CN101178662A CN 101178662 A CN101178662 A CN 101178662A CN A2006100635414 A CNA2006100635414 A CN A2006100635414A CN 200610063541 A CN200610063541 A CN 200610063541A CN 101178662 A CN101178662 A CN 101178662A
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Abstract
The invention relates to a monitoring method of an embed-type LINUX application course. For the monitoring problem of abnormal withdrawal of the appliance course, a cooperation mechanism is established between an application management subsystem and application procedure to judge effectively whether the withdrawal of sub-course is normal or abnormal. While for the monitoring problem of application course dead cycle, the Linux kernel attemper is modified to monitor whether the course is on dead cycle. The application just needs to transfer the joint provided by the management subsystem, a management subsystem can effectively and timely monitor whether the course or sub-course is in a state of abnormal withdrawal or dead cycle, thereby completely resolving the wrong judgment problem caused by that the existing normal monitoring method can not judge whether the sub-course belongs to normal withdrawal or abnormal withdrawal and monitoring the dead cycle only through CPU occupying rate.
Description
Technical field
The present invention relates to the method that application processes is monitored in built-in Linux application management subsystem.
Background technology
In embedded Linux system, one of task of application management subsystem is that the application process in the system is monitored, and promptly monitors application process in real time and whether withdraws from or enter endless loop unusually.Wherein application processes withdraw from unusually the common method of monitoring be by in the timer access Linux file system/ progress information file under the proc catalogue, if finding the message file of certain application process (or its subprocess) ID correspondence has not existed, just kill all processes relevant earlier, restart according to user's configuration again with this application program.But in the subprocess that application process produces, some subprocess can and host process existence always in system, and the other subprocess can move a period of time and normally withdraws from system.Owing to depend merely in the visit Linux file system/ progress information file under the proc catalogue is can't distinguish these subprocesss to belong to above which kind of situation, therefore when application processes and all subprocesss thereof all adopt conventional method to monitor, if find that certain subprocess has not existed, and this subprocess belongs to situation about normally withdrawing from, then can cause ADMINISTRATION SUBSYSTEM to restart application process blindly, thereby influence the normal operation of system.Also needing application processes whether to be in endless loop in addition in the ADMINISTRATION SUBSYSTEM monitors.Common method is the timing scan process status, if find its CPU usage always very the higher position think that it is endless loop, but this method False Rate is higher.
So in embedded Linux system application management subsystem, press for a kind of practicable method and monitor application process effectively and whether withdraw from or enter endless loop unusually, thereby finish monitor task well.
Summary of the invention
For overcoming shortcoming of the prior art, the method for supervising that the present invention proposes can be monitored application process effectively and whether be withdrawed from or enter endless loop unusually, thus the stability of safeguards system.
The present invention has two kinds of schemes, and first kind of scheme may further comprise the steps:
Step 2, be that application process is set up the monitoring registration interface and interface is nullified in monitoring;
Step 3, when an application process and its are produced all subprocesss and monitor, call the application process registration interface at application process mother block and the porch that produces the program segment of subprocess; Input parameter is imported ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with register requirement, ADMINISTRATION SUBSYSTEM is inserted in the process group record sheet after receiving this information, thereby begins this application process is monitored;
Step 4, if ADMINISTRATION SUBSYSTEM monitors in the process group arbitrary process to be taken place unusually, all processes with killing in this process group restart this process group then;
Step 5, when not needing again this process to be monitored, call application process in application process mother block and the exit that produces the program segment of subprocess and nullify interface; Input parameter is ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with de-registration request, ADMINISTRATION SUBSYSTEM receives after this information according to process ID number and find corresponding process record for process group ID number in the process group record sheet, with its deletion.
In the such scheme, the table of each application process group information that described record need be monitored is to set up in internal memory.
Described step 4 in the such scheme comprises:
ADMINISTRATION SUBSYSTEM access application process group record sheet obtains needing ID number of all application processes of monitoring;
Whether the application process of judging these ID correspondences according to the progress information under file system/proc catalogue exists, if exist, turns back to previous step after the time-delay; Otherwise, all application processes in the process group of non-existent process correspondence are all killed according to application process group record table;
All information of this process group in the deletion process group record table;
Restart the host process of killed process group, return after the time-delay.
Second kind of scheme of the present invention may further comprise the steps:
Step 2, be that application process is set up the monitoring registration interface and interface is nullified in monitoring;
Step 3, when an application process and its are produced all subprocesss and monitor, call the application process registration interface at application process mother block and the porch that produces the program segment of subprocess; Input parameter is imported ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with register requirement, ADMINISTRATION SUBSYSTEM is inserted in the process group record sheet after receiving this information, thereby begins this application process is monitored;
Step 4, in process scheduling, add dongle to process; When timeslice to and the generation task is switched and to be added one just for this dongle counter, if because other system call and the generation task is switched just the dongle counter O reset; When this Counter Value is bigger than certain threshold value, then this process conduct is in the endless loop state processing;
Step 5, when not needing again this process to be monitored, call application process in application process mother block and the exit that produces the program segment of subprocess and nullify interface; Input parameter is ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with de-registration request, ADMINISTRATION SUBSYSTEM receives after this information according to process ID number and find corresponding process record for process group ID number in the process group record sheet, with its deletion.
In the such scheme, described step 4 comprises:
In the process status data structure, add endless loop house dog counter and endless loop sign;
The correlated variables of initialization endless loop in producing process function promptly earlier is set to non-endless loop with counter O reset of endless loop house dog and endless loop sign;
In the process scheduling function, add judgment processing, obtain the timeslice number of this process operation of system assignment the process endless loop; Obtain the timeslice number of this process actual motion; If the timeslice number of actual motion equals system assignment timeslice number, the endless loop house dog counter of this process adds 1, otherwise zero clearing again; If the endless loop house dog of this process counting is greater than the endless loop threshold value, then sign is set to endless loop, otherwise is set to non-endless loop;
In the process status array, add an endless loop state, when be checked through process status be masked as endless loop the time, the recurrent state sign of then checkmating automatically is written in the process status information of file system/proc correspondence; During the process status of the watch-dog of ADMINISTRATION SUBSYSTEM each application under quantitative check/proc,, just be in the endless loop state processing by this process if find that certain state of a process is the endless loop Status Flag.
The present invention sets up a coordination mechanism between application management subsystem and application program, application program only need be called the interface that ADMINISTRATION SUBSYSTEM provides, then but whether ADMINISTRATION SUBSYSTEM just monitors this process or its subprocess efficient real time and is in and withdraws from unusually or the state of endless loop, still withdraws from unusually and only monitors erroneous judgement that endless loop the causes problem of breaking by CPU usage because can't judge that subprocess belongs to normally to withdraw from thereby solved conventional in the past method for supervising more up hill and dale.
Description of drawings
Fig. 1 is the overall framework figure of application management subsystem monitors application process of the present invention;
Fig. 2 is the processing flow chart that the monitoring process among the present invention withdraws from unusually;
Fig. 3 adds judgment processing process flow diagram to the process endless loop among the present invention in the process scheduling function.
Embodiment
The core concept of the method for supervising of application process of the present invention is: the monitoring problem that withdraws from unusually for application process, unusually withdraw from order to judge that effectively subprocess belongs to normally to withdraw from still, between application management subsystem and application program, set up a coordination mechanism.And, then revise linux kernel and dispatch and whether process is in endless loop monitors for the monitoring problem of application process endless loop.
Fig. 1 is the overall framework figure of application management subsystem monitors application process of the present invention.Before application programs is monitored, set up table that a record need each application process group record of monitoring in needing in Installed System Memory in ADMINISTRATION SUBSYSTEM.And this table has comprised the essential informations such as execute file position of the correspondence of each process in ID number of each process in process group number, each process group ID number, process group, process group.Here the notion of process group is the relevant process of one group of function, and even ADMINISTRATION SUBSYSTEM monitors arbitrary process generation unusual (as withdrawing from unusually or endless loop) in the process group, all will kill all processes in this process group, restarts this process group then.
The member who defines in its list structure is as follows:
(1) the process group number in the chained list;
(2) first process group record in this chained list;
(3) last process group record in this chained list
The member who defines in the data structure of process group record in the structure is as follows in the above:
(1) the process number that writes down in this process group;
(2) ID of this process group number;
(3) first process record in this process group;
(4) last process record in this process group;
(5) point to previous process group record;
(6) point to next process group record;
The member who defines in the data structure of process record in the structure is as follows in the above:
(1) PID of this process;
(2) position of the execute file of this process;
(3) point to previous process record;
(4) point to next process record;
ADMINISTRATION SUBSYSTEM will be set up the above-mentioned record sheet that needs each application process group of record of monitoring, the information that need obtain being correlated with from each application process, provide following two interfaces so be required to be application process: the one, application process monitoring registration interface, the 2nd, interface is nullified in the application process monitoring.The application management subsystem needs that an application process and it are produced all subprocesss and monitors, and calls application process registration interface and application process cancellation interface respectively in the porch and the exit of application process mother block and the program segment that produces subprocess.Define by application program oneself for the ID of process group number.
RegisterProc (int GroupID) function is used to finish the monitoring registering functional of application process, and wherein, GroupID is process group ID number; ADMINISTRATION SUBSYSTEM obtains ID number of this process, and with process group ID number (GroupID) of this process ID number and input and monomark sends to ADMINISTRATION SUBSYSTEM together by process communication mechanism (as message queue) watch-dog.
UnRegisterProc (int GroupID) function is used to finish the monitoring cancellation function of application process; ADMINISTRATION SUBSYSTEM obtains ID number of this process, and with process group ID number (GroupID) of this process ID number and input and nullify mark sends to ADMINISTRATION SUBSYSTEM together by process communication mechanism (as message queue) watch-dog.
If the watch-dog of ADMINISTRATION SUBSYSTEM receives the log-on message of application process, then under file system/Proc, find the relevant information of this process according to ID number of process, this information is inserted in process group record sheet, thereby begun its process is monitored.If the watch-dog of ADMINISTRATION SUBSYSTEM receives the log-off message of application process, then in the process group record sheet, find corresponding process record according to process ID number and GroupID, with its deletion, thereby no longer this process is monitored.
To solve effectively using the status monitoring of endless loop, need to revise linux kernel, promptly in process scheduling, add dongle to process.If since timeslice to and the generation task is switched and to be added one just for this dongle counter, if because other system call and the switching of generation task just the dongle counter O reset.When process had entered endless loop, it can initiatively not abdicate disposal right, then all was that timeslice arrives back generation systems task pressure switching at every turn, and the dongle counter will constantly increase like this.When this Counter Value is bigger than certain threshold value, judge that then this process is in the endless loop state.
Fig. 2 is the processing flow chart that application management subsystem monitors process exception withdraws from.
This application management subsystem access application process group record sheet obtains needing ID number of all application processes of monitoring; Whether the application process of judging these ID correspondences according to the progress information under file system/proc catalogue exists, if exist, turn back to previous step after the time-delay, otherwise, according to application process group record table all application processes in the process group of non-existent process correspondence are all killed, all information of this process group in the deletion process group record table restart the host process of killed process group, return after the time-delay.
The concrete treatment step that increases the monitoring process endless loop in the linux operating system nucleus is as follows:
The correlated variables of step 2 initialization endless loop in producing process function promptly earlier is set to non-endless loop with counter O reset of endless loop house dog and endless loop sign.
Step 3 is added the judgment processing to the process endless loop in the process scheduling function, detailed process as shown in Figure 3:
(1) timeslice that obtains this process operation of system assignment is counted S;
(2) timeslice that obtains this process actual motion is counted M;
(3) if the timeslice of actual motion is counted M to be equaled the system assignment timeslice and count S, the endless loop house dog counter of this process adds 1, otherwise zero clearing again;
(4) if the endless loop house dog of this process is counted greater than the endless loop threshold value, then sign is set to endless loop, otherwise is set to non-endless loop.Delay a period of time reenters (1);
Step 4 is added an endless loop state in the process status array;
Then kernel be checked through process status be masked as endless loop the time, then automatically " L " is written in the process status information of file system/proc correspondence.So during the process status of the watch-dog of ADMINISTRATION SUBSYSTEM each application under quantitative check/proc,, just can judge immediately that this process is in the endless loop state if find that certain state of a process is " L ".
Claims (5)
1. the method for supervising of an embedded LINUX applications progress is characterized in that, may further comprise the steps:
Step 1, in system, set up the table that a record needs each application process group information of monitoring; This table comprises the execute file positional information of the correspondence of each process in ID number of each process in process group number, each process group ID number, process group, process group; Described process group is the relevant process of one group of function;
Step 2, be that application process is set up the monitoring registration interface and interface is nullified in monitoring;
Step 3, when an application process and its are produced all subprocesss and monitor, call the application process registration interface at application process mother block and the porch that produces the program segment of subprocess; Input parameter is imported ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with register requirement, ADMINISTRATION SUBSYSTEM is inserted in the process group record sheet after receiving this information, thereby begins this application process is monitored;
Step 4, if ADMINISTRATION SUBSYSTEM monitors in the process group arbitrary process to be taken place unusually, all processes with killing in this process group restart this process group then;
Step 5, when not needing again this process to be monitored, call application process in application process mother block and the exit that produces the program segment of subprocess and nullify interface; Input parameter is ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with de-registration request, ADMINISTRATION SUBSYSTEM receives after this information according to process ID number and find corresponding process record for process group ID number in the process group record sheet, with its deletion.
2. the method for supervising of the described embedded LINUX applications progress of claim 1 is characterized in that, the table of each application process group information that described record need be monitored is to set up in internal memory.
3. the method for supervising of claim 1 or 2 described embedded LINUX applications progress is characterized in that, described step 4 comprises:
ADMINISTRATION SUBSYSTEM access application process group record sheet obtains needing ID number of all application processes of monitoring;
Whether the application process of judging these ID correspondences according to the progress information under file system/proc catalogue exists, if exist, turns back to previous step after the time-delay; Otherwise, all application processes in the process group of non-existent process correspondence are all killed according to application process group record table;
All information of this process group in the deletion process group record table;
Restart the host process of killed process group, return after the time-delay.
4. the method for supervising of an embedded LINUX applications progress is characterized in that, may further comprise the steps:
Step 1, in system, set up the table that a record needs each application process group information of monitoring; This table comprises the execute file positional information of the correspondence of each process in ID number of each process in process group number, each process group ID number, process group, process group; Described process group is the relevant process of one group of function;
Step 2, be that application process is set up the monitoring registration interface and interface is nullified in monitoring;
Step 3, when an application process and its are produced all subprocesss and monitor, call the application process registration interface at application process mother block and the porch that produces the program segment of subprocess; Input parameter is imported ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with register requirement, ADMINISTRATION SUBSYSTEM is inserted in the process group record sheet after receiving this information, thereby begins this application process is monitored;
Step 4, in process scheduling, add dongle to process; When timeslice to and the generation task is switched and to be added one just for this dongle counter, if because other system call and the generation task is switched just the dongle counter O reset; When this Counter Value is bigger than certain threshold value, then this process conduct is in the endless loop state processing;
Step 5, when not needing again this process to be monitored, call application process in application process mother block and the exit that produces the program segment of subprocess and nullify interface; Input parameter is ID number of process group at this application process place; This interface sends to application process ADMINISTRATION SUBSYSTEM together with ID number of this process and process group ID number of input by process communication mechanism with de-registration request, ADMINISTRATION SUBSYSTEM receives after this information according to process ID number and find corresponding process record for process group ID number in the process group record sheet, with its deletion.
5. the method for supervising of the described embedded LINUX applications progress of claim 4 is characterized in that, described step 4 comprises:
In the process status data structure, add endless loop house dog counter and endless loop sign;
The correlated variables of initialization endless loop in producing process function promptly earlier is set to non-endless loop with counter O reset of endless loop house dog and endless loop sign;
In the process scheduling function, add judgment processing, obtain the timeslice number of this process operation of system assignment the process endless loop; Obtain the timeslice number of this process actual motion; If the timeslice number of actual motion equals system assignment timeslice number, the endless loop house dog counter of this process adds 1, otherwise zero clearing again; If the endless loop house dog of this process counting is greater than the endless loop threshold value, then sign is set to endless loop, otherwise is set to non-endless loop;
In the process status array, add an endless loop state, when be checked through process status be masked as endless loop the time, the recurrent state sign of then checkmating automatically is written in the process status information of file system/proc correspondence; During the process status of the watch-dog of ADMINISTRATION SUBSYSTEM each application under quantitative check/proc,, just be in the endless loop state processing by this process if find that certain state of a process is the endless loop Status Flag.
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