Memory management method based on pcram main memory application

Abstract

The invention provides a memory management method based on application of a PCRAM (phase change random access memory) main memory. The memory management method is applied in a system constructed by a CPU (central processing unit), an internal memory and an external memory, and comprises the following steps that a DRAM (dynamic random access memory) cache is taken as a cache of the PCRAM main memory, and idle pages in the DRAM cache are substituted into the PCRAM main memory in a circulation and balance manner by a system; when the operation of writing data is implemented by the CPU, the CPU detects whether a to-be-written data page exists in the DRAM cache, if yes, data is written into the DRAM cache, otherwise the to-be-written data page is read into the DRAM cache by the PCRAM main memory to carry out the operation of writing, and the requirements on needed erasing and writing times, a writing speed, fatigue performance and the like of the PCRAM main memory are realized when the operation of CPU writing is carried out; and when the operation of reading is implemented by the CPU, the CPU firstly accesses the DRAM cache, when a to-be-accessed data page is not read in the DRAM, the CPU accesses the PCRAM main memory for reading, so that the direct reading of data in the DRAM cache and the PCRAM main memory by the CPU can be realized, and the workload during the operation of a system is greatly saved.

Description

Technical field [0001] The invention relates to a memory management technology, in particular to a memory management method based on PCRAM main memory applications. Background technique [0002] Memory (Memory) is one of the important components in the computer, it is a bridge to communicate with the CPU (central processing unit). All programs in the computer are run in the memory, so the performance of the memory has a great impact on the computer. Memory is also called internal memory, and its function is to temporarily store calculation data in the CPU and data exchanged with external memory such as hard disks. Therefore, the important hardware equipment of computer products, its software system can not achieve various functions without reading and writing the memory. At present, the industry's large-scale memory management is implemented through the operating system, so software systems must rely on the operating system when using memory. The operating system's large-scale...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the above two schemes is that if the CPU only needs to read a small amount of data in some data pages in the PCRAM cache, it still reads it into the DRAM for the CPU to access, which greatly increases the time required for the read operation. Workload and System Power Consumption

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