混合關(guān)鍵級(jí)調(diào)度的若干關(guān)鍵問題研究
[Abstract]:The modern embedded real-time system represented by the aviation and the automobile field, the software functions of the high security standard and other non-safety critical software functions share an embedded platform, so as to solve the problem that the software functions are diversified, Complicating demand conflicts with hardware platform limited SWa P (size and price) requirements. The real-time scheduling of such systems shall meet the two objectives at the same time: one is to meet the verification requirements for safety critical functions under the setting of relatively conservative time attribute; and at the same time, the design requirements of the high-efficiency utilization of the computing resources are met under the setting of a more optimistic time attribute. The scheduling problem of such hybrid key-level systems cannot be solved using the traditional real-time scheduling algorithm. The key-level scheduling problem has become one of the most challenging topics in the embedded field. In this paper, based on the different scheduling requirements of key-level scheduling for security and non-safety critical tasks, and the goal of efficient utilization of resources, different scheduling strategies for high and low key-level tasks are studied respectively. The main research work and results are as follows: (1) Based on the actual situation of the key-level improvement of the event-triggered system, the schedulability of the high-key task is analyzed, and the sufficient conditions for the scheduling of key-level and high-key tasks are obtained. It is pointed out that the trigger of the key-level improvement of the system is derived from the external event of the system. Based on the response time analysis technology, the influence of the key-level lifting time on the deadline for meeting the deadline of the high-critical-level tasks is studied. Based on this, a conditional priority switching algorithm is proposed in the key-level promotion period. Ensure that more critical-level tasks are properly scheduled. The simulation experiment shows the availability of the schedulable condition and the priority switching algorithm. (2) A hybrid key-level task scheduling algorithm, which is suitable for deadline-critical parameters, is proposed. The key-level task model of the critical-level task is defined, and the possible interference of the key-level task to the task scheduling of the high-critical stage is analyzed, so that the key-level task is improved in advance, and the limited low-key task is sacrificed. The deadline for critical-level tasks to dynamically change with system-critical levels can always be met. The simulation experiments prove that the pre-critical-level lifting algorithm is suitable for the task scheduling with the deadline as the key parameter, and is not affected by the high critical-level task ratio and the deadline change degree. (3) A semi-local scheduling algorithm is proposed for scheduling hybrid key-level tasks on a homogeneous multi-processor platform. in that invention, the high-key task utilization rate and the low-key-level task schedulability are taken into account, all high-critical tasks and most of the low-key-level tasks are fixed on a given processor, only a low-key-level task with a number of no more than the number of processors is the migration task, Can and can only be migrated on two adjacent processors, and can be synchronously executed. In exchange for efficient utilization of processor resources, the deadline for high-critical tasks can always be met. The simulation results show that the semi-local scheduling algorithm increases the schedulable task ratio by nearly 10% compared with the local scheduling hybrid key-level task. (4) A strategy to actively deal with the low-key task is put forward. for the hybrid key-level system with the standard authentication, after the critical level is improved, the idle time period in the execution in the multi-processing platform is recovered, the idle time period in the execution in the multi-processing platform is matched in a global allocation manner, the high-key task of the local scheduling is not interfered, It also allows as many tasks as possible to get the right schedule to improve resource utilization. The simulation experiment is compared with the existing TA, CD and CD-A algorithms, and the active processing of the low-key task strategy has a clear advantage in the number of acceptable tasks and the abandoned task ratio of the system. (5) A closed-loop mechanism for adaptive back-down system is proposed. based on the distribution characteristics of the actual execution time of the real-time task in different execution modes, the actual execution time of the high-key-level task is monitored, the trend and the execution mode of the high-key-level task utilization rate are predicted, and the low-key task which is abandoned when the key-level improvement in the scheduling is timely recovered, And the key level of the safety reduction system is realized. The simulation results show that the self-adaptive critical-level back-down algorithm is better than the BP method which is considered to be the best.
【學(xué)位授予單位】:湖南大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:TP301.6
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