Xen and the art of virtualization
SOSP '03 Proceedings of the nineteenth ACM symposium on Operating systems principles
Xen and co.: communication-aware CPU scheduling for consolidated xen-based hosting platforms
Proceedings of the 3rd international conference on Virtual execution environments
Towards scalable multiprocessor virtual machines
VM'04 Proceedings of the 3rd conference on Virtual Machine Research And Technology Symposium - Volume 3
Demand-based coordinated scheduling for SMP VMs
Proceedings of the eighteenth international conference on Architectural support for programming languages and operating systems
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Virtualization technology has known to be an efficient solution to reduce space and costs by using server consolidation and to provide flexible management of system resources. The widely used virtual machine monitor (VMM) such as Xen is not perfectly optimized for running over multiprocessor systems. In order to run VMMs over multi-processor systems without performance degradation, the scheduling algorithms running in the VMM should be modified. This paper proposes a Locking-aware Scheduler (LAS) algorithm that has eliminated the lock-holder preemption (LHP) problem, which causes the inefficient use of CPU resources in multiprocessor environments. By using LAS algorithm, Xen allows guest kernel to acquire spin-lock and prevents the preemption of related processors during operation. The performance results show that our proposed algorithm solves the LHP problem and reduces the total execution time.