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Optimizing guest swapping using elastic and transparent memory provisioning on virtualization platform
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DOI：10.1007/s11704-016-5217-z.png)
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On virtualization platforms, peak memory demand caused by hotspot applications often triggers page swapping in guest OS, causing performance degradation inside and outside of this virtual machine (VM). Even though host holds sufficient memory pages, guest OS is unable to utilize free pages in host directly due to the semantic gap between virtual machine monitor (VMM) and guest operating system (OS). Our work aims at utilizing the free memory scattered in multiple hosts in a virtualization environment to improve the performance of guest swapping in a transparent and implicit way. Based on the insightful analysis of behavioral characteristics of guest swapping, we design and implement a distributed and scalable framework HybridSwap. It dynamically constructs virtual swap pools using various policies, and builds up a synthetic swapping mechanism in a peer-to-peer way, which can adaptively choose different virtual swap pools.We implement the prototype of HybridSwap and evaluate it with some benchmarks in different scenarios. The evaluation results demonstrate that our solution has the ability to promote the guest swapping efficiency indeed and shows a double performance promotion in some cases. Even in the worst case, the system overhead brought by HybridSwap is acceptable.
Keyword:
virtualization
memory management
guest swapping
performance degradation
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