Dynamic memory management method based on memory hot plug for virtual machine

Abstract

The invention discloses a dynamic memory management system based on memory hot plug for a virtual machine, comprising a memory monitoring module, a memory distributing module and a memory hot plug module. The memory hot plug module adopts Linux memory hot plug mechanism to realize memory hot plug on a semi-virtual Linux virtual machine, thereby breaking through the initial memory toplimit of the virtual machine and efficiently improving the memory expandability of the virtual machine by increasing and reducing the memory randomly. On one hand, the memory distributing module dynamically predicts the memory requirement of the virtual machine and balances the memory pressure of each virtual machine, thereby being capable of satisfying the memory requirement of the virtual machine and also improving the memory utilization ratio of a physical machine; on the other hand, the memory distributing module can establish a new virtual machine by reasonably reducing the memory of the existing virtual machine when the memory of the physical machine is not enough, thereby realizing memory overuse and improving the memory utilization ratio of the physical machine.

Description

Technical field [0001] The invention belongs to the field of computer applications, relates to memory management of Xen paravirtualized virtual machines, and specifically relates to a dynamic memory management method in a multi-virtual machine environment. Background technique [0002] The resource scale of the current computing system continues to expand, the processing capacity is rapidly enhanced, the types of resources are increasingly abundant, and the application requirements are flexible and diverse. Virtualization technology can dynamically organize multiple computing resources and realize a transparent and scalable computing system architecture, thereby flexibly constructing a computing environment that meets multiple application requirements and improving the efficiency of computing resources. Various virtualization solutions continue to emerge, and the virtualization software Xen is undoubtedly one of the best. Xen is an open source virtual machine project initiated b...

AI Technical Summary

Problems solved by technology

However, the balloon driver has defects, such as the inability to expand the physical address space of the virtual machine, resulting in an upper limit on the memory size of the virtual machine; frequent use of the balloon driver will cause the physical address space to be discontinuous, resulting in memory fragmentation

Memory hot-swapping is an important technology of operating system memory management, which can effectively improve the shortcomings of balloon drive, but it has not yet been implemented on Xen virtual machines

[0004] In general, multiple virtual machines running on a single physical machine use static memory allocation, that is, the memory size of the virtual machine is always the same or manually adjusted by the administrator. When the load of the virtual machine changes, insufficient memory or excessive memory utilization may occur. low case

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