Integration method for large memory pages based on bitmap alteration of memory pages

Abstract

The invention discloses an integration method for large memory pages based on bitmap alteration of memory pages. The method comprises following steps: acquiring page fault frequency of a system memory according to the preset period when page fault frequency is larger than a first threshold value; obtaining access information of all memory pages in the period and calculating access heat rate of all the memory pages based on access information of all the memory pages; and renewing a bitmap of a system according to access heat rate of all the memory pages, calculating the digit number of difference before and after renewal of the bitmap, and splitting large pages or merging small pages to the system memory when the digit number of difference is larger than a second threshold value according to a renewed bitmap.The integration method for large memory pages based on bitmap alteration of memory pages has following beneficial effects: based on access heat rate of all the memory pages in the system memory, splitting of large pages or merging of small pages are carried out in order to match an allocation scheme with a practical situation of the system memory; flexibility in use and access speed of the system memory are improved; and final integration operation is performed or not based on threshold values for page fault frequency and the digit number of the bitmap so that bumping effect possibly caused by fluctuation of load is reduced.

Description

technical field [0001] The invention relates to the technical field of operating system memory management, in particular to a large memory page integration method based on memory page bitmap changes. Background technique [0002] With the continuous development of computer hardware technology, the memory configured on personal computers and servers is getting larger and larger. At present, the commonly configured memory can reach several gigabytes, and some services can reach hundreds of gigabytes or even terabytes of memory. [0003] In order to improve the flexibility and efficiency of memory usage, modern operating systems often use a memory paging mechanism, which divides all the physical memory of the system into several fixed-size memory pages. When an application needs to use memory, it applies to the operating system, and the operating system allocates several physical memory pages according to the request, and maps these physical pages to the virtual address space o...

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Problems solved by technology

[0008] However, if the size of all memory pages is set to 2MB, the internal fragmentation of the memory pages will be greatly increased. Although the memory can be used more efficiently, it will also cause a great waste of memory resources.

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