Method and device for zero copy of embedded system memory

Abstract

The invention discloses a method for zero copy of an embedded system memory. The method comprises the following steps that S10, a unified data block format which comprises a standard head, an extension head and a reserved space is adopted; S20, a module A allocates a memory to the data Z according to a unified data block format, and configures a mem_msg field; and writing data Z in the corresponding header position of the unified data block format; S30, the module A expands the data structure of the pbuf, and adds a pointer pointing to the head of the Ethernet and the memory allocation and release field; S40, the module A processes the data Z based on the expanded pbuf data structure, and adds a release function pointer in a mem_msg field pointed by the pkt_msg pointer in a pbuf release function; S50, the module B reads the memory allocation and release field, and calls the memory release function pointed by the release function pointer to release the memory occupied by the data Z. According to the method, memory allocation and release and data zero-copy transmission are optimized.

Description

technical field [0001] The present application relates to a memory allocation and release management method of an embedded system (embedded system). Background technique [0002] In an embedded system based on RTOS (real-time operating system, real-time operating system), there may be various types of internal memory, such as RAM (random-access memory, random access memory), ROM (read-only memory, only Read memory), and a specific memory pool (memory pool). In this application, the internal memories in these embedded systems are collectively referred to as memory. At the same time, in order to adapt to the special scene of the module, it is also possible to define the way of memory allocation and release for the module. For RTOS systems, the scheduling of tasks generally adopts the method of thread (thread), and the memory is shared by all threads, so the message interaction between threads often adopts the method of shared memory, which brings about the management of memo...

AI Technical Summary

Problems solved by technology

Different data sources may correspond to different memory allocation modes, and for the TCP / IP protocol, the processing of each layer of IP data packets needs to reduce copying as much as possible to avoid performance loss

[0004] Existing technical solutions focus more on improving the efficiency of memory allocation, such as adopting the design method of memory pool to improve access efficiency, but no optimization solution is proposed from the perspective of the system

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