Method and system for recording access situation of hybrid memory

Abstract

The invention provides a method for recording the access situation of a hybrid memory. The method includes the steps that the representation value of a vacancy bit in a page table entry and the representation value of the dirty bit in a page table entry are acquired; the write-back step is executed, wherein the representation value of the dirty bit in the page table entry is moved to a first bit of the vacancy bit of the page table entry, the representation values of all bits in the vacancy bit are sequentially moved to higher bits, and the dirty bit is reset. The use situation of a page is recorded through the vacancy bit and the dirty bit in the page table entry together, by the utilization of the characteristics that when the page is written in, the dirty bit is placed on the first bit and the vacancy bit is originally not used, additional special memory access statistical work is not needed, storage space does not need to be additionally developed for storing statistical results, historical access information of the page table entry can be acquired when the page table entry is traversed, and cost of system time and space is lowered.

Description

technical field [0001] The invention relates to the field of memory, in particular to a method and system for recording mixed memory access conditions. Background technique [0002] DRAM (Dynamic Random Access Memory, dynamic random access memory) has always played the role of the main memory in the computer system. It has encountered great challenges, its technology is close to the bottleneck, and it is urgent to find a new substitute. PRAM (Phase change Random Access Memory, phase change random access memory) has gradually become the storage device most likely to replace DRAM by virtue of its excellent characteristics. [0003] However, compared with DRAM, PRAM has low read power consumption and low static power consumption, but its write power consumption and write delay are relatively large, so PRAM cannot completely replace DRAM as the main memory. At present, the most common method is to let PRAM and DRAM form a mixed main memory together. Under the DRAM-PRAM hybrid...

AI Technical Summary

Problems solved by technology

In order to record the access status of the page in the recent period, it is usually to open up a dedicated storage space, occupying additional hardware space, increasing the cost, storing the access status of the page, and maintaining the corresponding relationship between the record and the page, and traversing each time a page is selected Page table and record table, time overhead increases

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