Memory allocation method based on fine granularity

Abstract

The invention discloses a memory allocation method based on fine granularity. The method is characterized by adopting detection of a virtual machine type, detection of the internal page type of a virtual machine, a differential page allocation strategy of fine granularity and a memory dynamic allocation strategy for access sensing. Since the type of the virtual machine is distinguished, pages usedby an I / O intensive type virtual machine and a computational intensive type virtual machine are all small. Compared with a strategy in which a default option of a system is to allocate large pages for virtual machines, the method has the advantages that memory expansion is relieved, the expense for memory allocation is reduced, and the repeated deletion rate of a memory is decreased; meanwhile, as for an access-intensive type virtual machine, allocated anonymous pages of the virtual machine are large, high memory access performance can be maintained, and since allocated Page Cache pages and kernel pages of the access-intensive type virtual machine are small, compared with the strategy in which the default option of the system is to allocate large pages, the method has the advantages thatthe memory expansion is relieved, the expense for memory allocation is reduced, the repeated deletion rate of the memory is increased, and the loss of system performance is reduced as much as possible.

Description

technical field [0001] The invention belongs to the technical field of computer memory management, and specifically relates to a fine-grained implementation of a performance-efficient memory allocation method through a detection mechanism of a virtual machine type and a page type. Background technique [0002] Linux version 2.6.38 introduces the kernel feature of transparent huge pages (Transparent Hugepages), which achieves better performance by improving the efficiency of the processor's memory-mapped hardware. In the Linux memory management system, the size of ordinary pages is 4KB, and these pages are called small pages, while the size of transparent huge pages is 2MB, and these pages are called huge pages. Although large pages have higher memory access performance than small pages, they bring problems such as memory expansion, high allocation overhead, and low memory deduplication rate to the system. During the running of a virtual machine, different virtual machines h...

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Problems solved by technology

During the running of the virtual machine, the memory management system does not consider the differences in page access characteristics, but uniformly allocates large pages to the virtual machine. Although this memory allocation mechanism brings performance advantages to the virtual machine, it also Problems such as memory expansion, increased memory allocation overhead, and reduced memory deduplication rate are introduced to the system

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