Data prefetching method, and related devices and systems

Abstract

Embodiments of the invention disclose a data prefetching method, and related devices and systems. The method comprises operating an executable program; and, when the program runs to a prefetching code, performing control on data prefetching in a data memory according the instruction of the prefetching code, wherein the control of data prefetching in the data memory according to the instruction of the prefetching code involves: if the prefetching code includes a prefetching enabling code that instruct the prefetching function to be enabled, controlling the prefetching function to be enabled and conducting the data prefetching in the data memory; and if the prefetching code includes a prefetching disabling code that instruct the prefetching function to be disabled, controlling the prefetching function to be disabled and stopping the data prefetching in the data memory. According to the invention, the prefetching function of a data prefetching device can be enabled or disabled by directly controlling the cache, so that the power consumption is reduced, and the problem of cache pollution caused by prefetching misoperation is effectively prevented.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to a data prefetching method, a related device and a system. Background technique [0002] In the existing computer system, although the improvement of the main frequency of the processor such as CPU (Central Processing Unit, central processing unit) will lead to the improvement of the system performance, the improvement of the system performance does not only depend on the CPU, but also depends on the system architecture, instruction It is related to factors such as the structure, the transmission speed of information between various components, and the access speed of storage components, especially the access speed between CPU / memory. If the CPU works at a high speed, but the memory access speed is relatively low, it will cause the CPU to wait, reduce the processing speed, and waste the CPU's ability. [0003] There are currently several ways to reduce the speed differe...

AI Technical Summary

Problems solved by technology

The inventors found that when prefetching data in the prefetching mode combined with software and hardware in the prior art, the hardware needs to be in the prefetching state all the time during the execution of the executable program corresponding to the task, which will bring unnecessary energy consumption. And the hardware has been processing the prefetch state and may also generate unnecessary prefetch operations, resulting in problems such as Cache pollution.

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