CN117420881A - Method for recording and converting audit time of embedded equipment - Google Patents
Method for recording and converting audit time of embedded equipment Download PDFInfo
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- CN117420881A CN117420881A CN202311736581.0A CN202311736581A CN117420881A CN 117420881 A CN117420881 A CN 117420881A CN 202311736581 A CN202311736581 A CN 202311736581A CN 117420881 A CN117420881 A CN 117420881A
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- 238000012550 audit Methods 0.000 title claims abstract description 213
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/12—Synchronisation of different clock signals provided by a plurality of clock generators
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/10—Office automation; Time management
- G06Q10/109—Time management, e.g. calendars, reminders, meetings or time accounting
- G06Q10/1091—Recording time for administrative or management purposes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention discloses a method for recording and converting audit time of embedded equipment, which comprises the following steps: updating the starting sequence number, and recording an event of updating the starting sequence number by using monotone time; recording audit records using monotonic time; synchronizing the wall time; recording audit records using monotonic time or wall time; and obtaining an audit record. According to the invention, when the embedded equipment does not synchronize the wall clock, the audit event is recorded by the monotone clock, and after the embedded equipment and host equipment synchronize time, the monotone time in the audit event is revised by the synchronized wall time, so that the utilization value of the audit record is improved.
Description
Technical Field
The invention belongs to the field of information technology application, and particularly relates to a method for recording and converting audit time of embedded equipment.
Background
To reduce embedded hardware costs, a large number of embedded devices provide only a monotonic clock, no wall clock, and the devices must synchronize wall time from the host device after each start-up, which typically results in the embedded device starting faster and the host device starting slower, which results in no wall time available after the embedded device starts up, and audit events recorded during that time that are difficult to effectively utilize due to the lack of wall time. For some embedded equipment with high safety and high reliability, a great amount of self-checking and testing work can be carried out in the power-on starting process of the equipment, and the audit event in the stage has higher utilization value for troubleshooting and optimizing the functional performance of products, so that a method is necessary to design a method for recording the audit event time before wall time synchronization and determining the wall time when each audit record occurs through time conversion after the wall time synchronization, thereby improving the utilization value of the audit record.
In the above, wall clocks, also known as clock times, are used to represent specific dates and times, consistent with the daily understood clock concept. Monotonic clocks, always guaranteed time is forward, can record the duration that the device experiences since it was booted.
Disclosure of Invention
In order to achieve the above purpose, the present invention proposes a method for audit time recording and conversion of an embedded device. According to the method, when the embedded equipment does not synchronize the wall clock, the audit event is recorded by the monotone clock, after the embedded equipment and the host equipment synchronize time, the monotone time in the audit event is revised by the synchronized wall time, and the utilization value of the audit record is improved.
The aim of the invention is achieved by the following technical scheme.
The invention relates to a method for recording and converting audit time of embedded equipment, which comprises the following steps:
(1) Updating the starting sequence number and recording the event of updating the starting sequence number by using monotone time
The embedded equipment acquires the last starting sequence number from the last historical audit record after being powered on, the last starting sequence number is taken as the current starting sequence number after being powered on by 1, and an event of updating the starting sequence number is recorded in the audit record by using monotone time, wherein the elements of the audit record are recorded as follows: the starting sequence number of this time, "updating the starting sequence number", writing monotonic time of audit record moment, and the state information of the current embedded device;
(2) Audit recording using monotonic time recording
Under the condition that the embedded equipment does not synchronize the time of the host equipment, the embedded equipment uses monotone time to record audit records, and the elements of the audit records are recorded as follows in sequence: the specific audit event in the process of starting sequence number, monotone time audit record, monotone time and monotone time record;
(3) Time on synchronous wall
After the host device initiates a time synchronization instruction, the embedded device acquires the wall time from the host device, and records a time synchronization event in an audit record, wherein the elements in the audit record are recorded as follows in sequence: the starting sequence number, time synchronization, monotonic time and wall time;
(4) Audit recording using monotonic time or wall time recordings
When the embedded equipment uses the wall time to record audit records, the elements of the audit records are recorded as follows in sequence: the starting sequence number, the wall time audit record, the wall time and the specific event in the wall time record process; when the embedded equipment uses the monotone time to record the audit record, the elements of the audit record are recorded as follows in sequence: the specific audit event in the process of starting sequence number, monotone time audit record, monotone time and monotone time record;
(5) Audit record acquisition
(1) When the host device initiates an audit record acquisition instruction, if the time conversion is designated by the embedded device, outputting audit record contents after converting the monotonic time into the wall time according to the starting sequence number, the type mark and the audit time in the embedded device and for the audit record with the type mark of monotonic time audit record; for audit records with the type mark of wall time audit record, directly outputting audit record content;
(2) when the host machine equipment initiates an audit record acquisition instruction, if the host machine equipment is appointed to perform time conversion, the embedded equipment directly outputs an original audit record, and for the audit record with a type mark of 'monotonic time audit record', the host machine equipment converts monotonic time into wall time according to a starting sequence number, a type mark and audit time; for audit records with type flags "wall time audit record", no conversion is required.
Further, the elements of the audit record comprise a starting sequence number, a type mark, audit time and audit content;
the starting sequence number is used for determining the current audit record which is recorded after the embedded equipment is started, the starting sequence number starts from a specified initial value, and the sequence number is increased by 1 after each power-on;
the type mark is used for marking audit record types, including updating a starting sequence number, time synchronization, monotonic time audit record and wall time audit record;
the audit time is used for recording the time information of the audit record, is monotone time or wall time, and is distinguished by a type mark;
the audit content is used for recording specific audit events.
Further, the specific conversion method for converting the monotonic time into the wall time is as follows:
assuming that the starting sequence number of the current audit record is N, traversing all audit records with the starting sequence number of N, finding an audit record with a type mark of time synchronization, extracting wall time wallTime and monotonic time monotonime from the audit record, and calculating to obtain a difference value diffTime=wallTime-monotonime;
for all audit records with the starting sequence number N, analyzing from the ith audit record to obtain a type mark and audit time T i If the type flag is "monotonic time audit record", the wall time W of the audit record i The calculation mode of (a) is as follows: w (W) i =diffTime+T i 。
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the method for recording and converting the audit time of the embedded equipment can provide the function of converting the monotonic time into the wall time for a large number of embedded equipment which has a monotonic clock but does not have a wall clock, thereby improving the utilization value of the audit record of the embedded equipment. The method is simple in principle and easy to implement, can be implemented through software or firmware logic, can be packaged into standard public components, and is provided for various embedded systems.
Drawings
FIG. 1 is a flow chart of a method for audit time recording and conversion of an embedded device of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention discloses an audit time recording and converting method of embedded equipment, which is used for recording and converting audit time based on designed audit records. The elements of the audit record comprise a starting sequence number, a type mark, audit time and audit content, and the monotonic time in the audit record can be converted into the wall time through the elements. The method for representing the audit record elements (such as the sequence, the field length, the storage mode and the like of each element) can be flexibly adjusted according to actual conditions, for example, a table 1 structure can be used for representing an audit record, but the method is not limited to the table 1 representation mode.
TABLE 1
The elements of the audit record in the invention are described as follows:
(1) starting up sequence number: for determining which embedded device is to be powered on and then record the current audit record. The boot sequence number starts from a specified initial value and increases by 1 after each power-up.
(2) Type flag: for marking audit record types. The type mark in the invention comprises an update starting sequence number, time synchronization, monotone time audit record and a wall time audit record.
(3) Audit time: the time information used for recording the audit record can be monotonous time or wall time, and is distinguished by a type mark.
(4) Audit content: other elements, such as security related elements, may also be added according to embedded device requirements for recording specific audit events.
As shown in fig. 1, the method for recording and converting the audit time of the embedded device comprises the following specific implementation processes:
(1) Updating the starting sequence number and recording the event of updating the starting sequence number by using monotone time
The boot sequence number starts from a specified initial value and increases by 1 after each power-up. After the embedded equipment is powered on, the last starting sequence number is firstly obtained from the last historical audit record, the last starting sequence number is taken as the current starting sequence number after 1 is added, an event of updating the starting sequence number is recorded in the audit record by using monotone time, and four elements of the audit record are recorded as follows in sequence: other information such as the state information of the current embedded device can be written in the current starting sequence number, the updated starting sequence number, the monotone time when the audit record is written in and the audit content. If no history audit record exists, the starting sequence number is set to an initial value, and 1 can be selected as the initial value in general, and other initial values can be set.
(2) Audit recording using monotonic time recording
Under the condition that the embedded equipment does not synchronize the time of the host equipment, the embedded equipment uses monotone time to record audit records, and four elements of the audit records are recorded as follows in sequence: the specific audit event in the process of starting sequence number, monotone time audit record, monotone time and monotone time record.
(3) Time on synchronous wall
After the host device initiates a time synchronization instruction (i.e., a wall time synchronization instruction), the embedded device acquires wall time from the host device, and records a time synchronization event in an audit record, wherein four elements in the audit record are recorded as follows in sequence: this time of starting up sequence number, "time synchronization", monotonic time, wall time. The accuracy of the monotonic time and the wall time should be consistent, such as both to milliseconds, or both to microseconds.
(4) Audit recording using monotonic time or wall time recordings
After synchronizing the on-wall time, the embedded device may use the on-wall time to record subsequent audit records, or may still use monotonic time to record audit records. When the embedded equipment uses the wall time to record the audit record, four elements of the audit record are recorded as follows in sequence: the method comprises the steps of starting up serial numbers, wall time audit records, wall time and specific events in the wall time recording process. When the embedded equipment uses the monotone time to record the audit record, the four elements of the audit record are recorded as follows in sequence: the specific audit event in the process of starting sequence number, monotone time audit record, monotone time and monotone time record.
(5) Audit record acquisition
(1) When the host device initiates an audit record acquisition instruction, if the time conversion is designated by the embedded device, outputting audit record contents after converting the monotonic time into the wall time according to the starting sequence number, the type mark, the audit time and other factors in the embedded device and for the audit record with the type mark of monotonic time audit record; and directly outputting audit record contents for audit records with the type mark of 'wall time audit record'.
(2) When the host machine equipment initiates an audit record acquisition instruction, if the host machine equipment is appointed to perform time conversion, the embedded equipment directly outputs an original audit record, and for the audit record with a type mark of 'monotonic time audit record', the host machine equipment converts monotonic time into wall time according to a starting sequence number, a type mark and audit time; for audit records with type flags "wall time audit record", no conversion is required.
In the above, the monotonic time in the audit record can be converted into the wall time by using the elements of the start-up sequence number, the type mark, the audit time, the audit content and the like in the audit record, and the specific conversion method is as follows:
(a) Assuming that the starting sequence number of the current audit record is N, traversing all audit records with the starting sequence number of N, finding an audit record with a type mark of time synchronization, extracting wall time wallTime and monotonic time monotonime from the audit record, and calculating a difference value diffTime=wallTime-monotonime of the wall time wallTime and the monotonic time because the accuracy of the wall time wallTime and the monotonic time is the same.
(b) For all audit records with the starting sequence number N, analyzing from the ith audit record to obtain a type mark and audit time T i If the type flag is "monotonic time audit record", the wall time W of the audit record i The calculation mode of (a) is as follows: w (W) i =diffTime+T i 。
It should be noted that:
in some extreme cases (e.g., when the host device fails), there may be a situation where the host device is out of sync after a certain power-on (assuming the power-on number is M), and then a "time-sync" event will not be obtained through step (a), resulting in a time-shift failure. At this time, all audit records with the starting sequence number M cannot finish the conversion from monotone time to wall time. However, by using the wall time of the audit records in the adjacent startup orders (startup orders M-1 and M+1), the wall time range of all audit records with startup sequence number M can be obtained.
The invention does not limit the traversing mode, but after each time of starting up and completing time synchronization, the time conversion times can be effectively reduced by using the wall time audit record, and in this case, if the last audit record is traversed to the oldest audit record, the conversion efficiency can be obviously improved.
Although the function and operation of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific functions and operations, but the above-described specific embodiments are merely illustrative, not restrictive, and many forms can be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are included in the protection of the present invention.
Claims (3)
1. The method for recording and converting the audit time of the embedded equipment is characterized by comprising the following steps:
(1) Updating the starting sequence number and recording the event of updating the starting sequence number by using monotone time
The embedded equipment acquires the last starting sequence number from the last historical audit record after being powered on, the last starting sequence number is taken as the current starting sequence number after being powered on by 1, and an event of updating the starting sequence number is recorded in the audit record by using monotone time, wherein the elements of the audit record are recorded as follows: the starting sequence number of this time, "updating the starting sequence number", writing monotonic time of audit record moment, and the state information of the current embedded device;
(2) Audit recording using monotonic time recording
Under the condition that the embedded equipment does not synchronize the time of the host equipment, the embedded equipment uses monotone time to record audit records, and the elements of the audit records are recorded as follows in sequence: the specific audit event in the process of starting sequence number, monotone time audit record, monotone time and monotone time record;
(3) Time on synchronous wall
After the host device initiates a time synchronization instruction, the embedded device acquires the wall time from the host device, and records a time synchronization event in an audit record, wherein the elements in the audit record are recorded as follows in sequence: the starting sequence number, time synchronization, monotonic time and wall time;
(4) Audit recording using monotonic time or wall time recordings
When the embedded equipment uses the wall time to record audit records, the elements of the audit records are recorded as follows in sequence: the starting sequence number, the wall time audit record, the wall time and the specific event in the wall time record process; when the embedded equipment uses the monotone time to record the audit record, the elements of the audit record are recorded as follows in sequence: the specific audit event in the process of starting sequence number, monotone time audit record, monotone time and monotone time record;
(5) Audit record acquisition
(1) When the host device initiates an audit record acquisition instruction, if the time conversion is designated by the embedded device, outputting audit record contents after converting the monotonic time into the wall time according to the starting sequence number, the type mark and the audit time in the embedded device and for the audit record with the type mark of monotonic time audit record; for audit records with the type mark of wall time audit record, directly outputting audit record content;
(2) when the host machine equipment initiates an audit record acquisition instruction, if the host machine equipment is appointed to perform time conversion, the embedded equipment directly outputs an original audit record, and for the audit record with a type mark of 'monotonic time audit record', the host machine equipment converts monotonic time into wall time according to a starting sequence number, a type mark and audit time; for audit records with type flags "wall time audit record", no conversion is required.
2. The method for recording and converting audit time of embedded equipment according to claim 1, wherein the elements of the audit record include a boot sequence number, a type flag, an audit time, and audit content;
the starting sequence number is used for determining the current audit record which is recorded after the embedded equipment is started, the starting sequence number starts from a specified initial value, and the sequence number is increased by 1 after each power-on;
the type mark is used for marking audit record types, including updating a starting sequence number, time synchronization, monotonic time audit record and wall time audit record;
the audit time is used for recording the time information of the audit record, is monotone time or wall time, and is distinguished by a type mark;
the audit content is used for recording specific audit events.
3. The method for recording and converting audit time of embedded equipment according to claim 1, characterized in that the specific conversion method for converting monotonic time into wall time is as follows:
assuming that the starting sequence number of the current audit record is N, traversing all audit records with the starting sequence number of N, finding an audit record with a type mark of time synchronization, extracting wall time wallTime and monotonic time monotonime from the audit record, and calculating to obtain a difference value diffTime=wallTime-monotonime;
for all audit records with the starting sequence number N, analyzing from the ith audit record to obtain a type mark and audit time T i If the type flag is "monotonic time audit record", the wall time W of the audit record i The calculation mode of (a) is as follows: w (W) i =diffTime+T i 。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311736581.0A CN117420881A (en) | 2023-12-18 | 2023-12-18 | Method for recording and converting audit time of embedded equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311736581.0A CN117420881A (en) | 2023-12-18 | 2023-12-18 | Method for recording and converting audit time of embedded equipment |
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Citations (5)
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|---|---|---|---|---|
| US5327553A (en) * | 1989-12-22 | 1994-07-05 | Tandem Computers Incorporated | Fault-tolerant computer system with /CONFIG filesystem |
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| CN105337680A (en) * | 2015-08-07 | 2016-02-17 | 中国人民解放军63892部队 | High-precision network time unifying device and method |
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-
2023
- 2023-12-18 CN CN202311736581.0A patent/CN117420881A/en not_active Withdrawn
Patent Citations (5)
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|---|---|---|---|---|
| US5327553A (en) * | 1989-12-22 | 1994-07-05 | Tandem Computers Incorporated | Fault-tolerant computer system with /CONFIG filesystem |
| CN101731011A (en) * | 2007-05-11 | 2010-06-09 | 奥迪耐特有限公司 | Systems, methods and computer-readable media for configuring receiver latency |
| CN105337680A (en) * | 2015-08-07 | 2016-02-17 | 中国人民解放军63892部队 | High-precision network time unifying device and method |
| CN112584087A (en) * | 2021-02-25 | 2021-03-30 | 浙江华创视讯科技有限公司 | Video conference recording method, electronic device and storage medium |
| CN113821076A (en) * | 2021-10-11 | 2021-12-21 | 上海航天计算机技术研究所 | Virtual simulation system and synchronization method based on virtual clock |
Non-Patent Citations (1)
| Title |
|---|
| 王旭: "计算机指令集仿真器的时间仿真技术研究", 计算机应用与软件, no. 08, 12 August 2005 (2005-08-12), pages 3 - 4 * |
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