In 10 the authors suggest a different approach to migrating virtual machines

In 10 the authors suggest a different approach to

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In [10], the authors suggest a different approach to migrating virtual machines. Instead of traditional host driven migration, the authors propose self-migration of virtual machines and claim there are additional benefits when virtual machines are migrated in this manner. For example, there would be less overhead incurred from communication between the VMM and the virtual machine as well as increased security benefits. The network and CPU cost of performing the migration is attributed to the guest OS, rather than to the host environment. Portability is another benefit of self migration. Since migration happens without hypervisor involvement, this approach is less dependent on the semantics of the hypervisor and can be ported across different hypervisors and microkernels. 1) Memory Migration: In a virtual machine system, memory migration is one of the most important aspects of virtual machine migration. In general, the memory migration can be classified into three phases: namely push phase, stop- and-copy phase and pull phase. In the push phase, the source virtual machine continues running while certain pages are pushed across the network to the new destination. To ensure consistency, the pages modified during the transmission process must be re-sent. In the stop-and-copy phase, the source virtual machine is stopped, pages are copied across to the destination virtual machine, and then the new virtual machine is started. In the pull phase, the new virtual machine starts its execution, and if it accesses a page that has not yet been copied, this page is faulted in, across the network from the source virtual machine. Practical solution paradigms include schemes incorporating mostly one or two of the above phases. For example, Internet suspend-resume technique uses pure stop-and-copy as its
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memory migration paradigm. In addition, this technique applies certain basic heuristics in order to reduce the content to be migrated. Similarly, pure demand-migration technique uses stop-and-copy to transfer essential kernel data structures to the destination, which is based on page faults at the site being transferred to. Pre-copy technique incorporates iterative push phases and a stop-and-copy phase which lasts for a very short duration [10]. In short, the pages to be transferred during round ‘n’ are only the ones dirtied during round ‘n-1’. But there will always be a certain set of pages which are being updated so frequently that they can never be served by pure pre- copy iterations. C. Resource Scheduling In the virtual machine system, system resources are managed and controlled by a virtual machine monitor. Each virtual machine schedules the system resources for different tasks by using some resource scheduling algorithms, which are provided by the virtual machine monitor. These resource scheduling algorithms can be simply shown as follows.
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  • Fall '16
  • Sir Adnan
  • virtual machine

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