Method and device for zero copy of embedded system memory

Abstract

The present application discloses a zero-copy method for embedded system memory, which includes the following steps. Step S10: adopting a unified data block format, including a standard header, an extended header and a reserved space. Step S20: Module A allocates memory for data Z according to the unified data block format, and configures the mem_msg field; at the same time, writes data Z in the corresponding head position of the unified data block format. Step S30: module A expands the data structure of pbuf, and adds pointers to the Ethernet header and memory allocation and release fields. Step S40: Module A processes data Z based on the expanded pbuf data structure, and adds a release function pointer in the mem_msg field pointed to by the pkt_msg pointer in the pbuf release function. Step S50: Module B reads the memory allocation and release field, and calls the memory release function pointed to by the release function pointer therein to release the memory occupied by data Z. This application optimizes memory allocation and release, and data zero-copy transfer.

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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