Method for fast scanning dirty page bitmap of full-virtualization virtual machine

Abstract

The invention discloses a method for fast scanning a dirty page bitmap of a full-virtualization virtual machine. The method comprises the following steps: a zone bit initialization phase, allocating a first class zone bit and a second class zone bit for 4 gigabyte (GB) memory space of the full-virtualization virtual machine in Xen address space, and meanwhile, initializing the first class zone bit and the second class zone bit into zero, wherein the number of the first class zone bit is 4GB / 128MB=32, and the number of the second class zone bit is one; a zone bit setting phase, reading an address in a second class page table entry of an Xen and setting the values of the first class zone bit and the second class zone bit according to the address; and a zone bit scanning phase, scanning the dirty page bitmap of the full-virtualization virtual machine according to the values of the first class zone bit and the second class zone bit so as to obtain a dirty page number. According to the method for fast scanning the dirty page bitmap of the full-virtualization virtual machine, the time for suspending the virtual machine caused by scanning of the dirty page bitmap in a dynamic migration or a Remus HA system of the virtual machine is reduced, so that the calculated performance and the service quality of the virtual machine are enhanced.

Description

technical field [0001] The invention belongs to the field of computing system virtualization, and more specifically relates to a method for quickly scanning a dirty page bitmap of a fully virtualized virtual machine. Background technique [0002] System virtualization (System virtualization) is to run multiple operating system instances on a single physical hardware at the same time. These operating system instances share the underlying physical hardware resources and are independent of each other without interfering with each other. Resources are fully and efficiently used. Virtual machine (Virtual machine, referred to as VM) live migration (Live migration), as an important feature of system virtualization, allows virtual machines to migrate from one physical computer to another with almost no service interruption. It is transparent to virtual machines and users, and is widely used in system maintenance, load balancing, and fault-tolerant disaster recovery in data centers....

AI Technical Summary

Problems solved by technology

It is worth emphasizing that the virtual machine is in a paused state during the process of scanning the dirty page bitmap. For an application such as Remus that performs high-frequency (2HZ~40HZ) synchronization of the virtual machine state, the scanning of the dirty page bitmap The time overhead has a serious impact on the performance of the virtual machine

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