Memory control method for embedded systems

Abstract

The invention provides a memory control method for embedded systems. The method includes: applying for memory in an operating system, and using part of the memory as a memory pool and the other part as a reserved memory area; establishing a cache for each thread by pool management of the memory pool and thread caching technology; subjecting the reserved memory area to management by TLSF (two-level segregated fit) algorithm; dividing the memory pool into memory blocks different in size, connecting the memory blocks in the same size to form a double linked list, adding a memory management unit for each memory block, and placing the memory management unit and the memory blocks in different memory areas respectively; and establishing a memory statistical linked list for each thread to connect the memory blocks applied by the thread so as to facilitate troubleshooting of memory leak. In addition, a memory coverage checking mechanism is added without increasing cost of the memory control method.

Description

technical field [0001] The invention relates to the technical field of embedded systems, in particular to a memory control method of the embedded system. Background technique [0002] The memory resource of the embedded system is quite limited, so it needs to be planned and managed reasonably. Memory is the basis for all threads in the system to run, and is the most important system resource of the embedded system. Simple and efficient memory organization and management is the guarantee of stable and high-speed operation of the system. Embedded systems require fast, reliable and efficient memory allocation. A common management method is the memory pool method. [0003] The implementation mechanism is to apply for all the memory required by all subsequent applications at one time, cut it into memory blocks of various fixed sizes and different numbers, form a memory pool according to a certain data structure, and then perform secondary allocation on demand. [0004] The pu...

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Problems solved by technology

[0005] However, the memory pool also has certain disadvantages. All processes share the same memory pool. Multiple tasks of multiple processes will compete for the same lock when allocating and releasing memory blocks. The overhead of locks will greatly reduce the efficiency of memory management.

In addition, the control information of the memory pool and the memory block of the application layer are stored continuously. Once the misoperation of application memory overwriting occurs, the control information of the memory block will often be overwritten, which may lead to serious consequences including system crashes.

[0006] In addition, the application of pointers in C code will bring hidden dangers of memory out of bounds. It often happens that the content of a certain section of memory is modified and the system runs abnormally. When an exception occurs, it is only a crime scene, and it is impossible to locate who modified this section of memory.

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