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The Scientific World Journal
Volume 2015 (2015), Article ID 896519, 10 pages
http://dx.doi.org/10.1155/2015/896519
Research Article

Using Shadow Page Cache to Improve Isolated Drivers Performance

1Department of Computer Science and Technology, Xi’an Jiaotong University, Xianning West Road No. 28, Xi’an 710049, China
2State Key Laboratory of High-End Server & Storage Technology, Xinluo Street No. 1799, Jinan 250000, China

Received 30 June 2014; Revised 25 January 2015; Accepted 11 February 2015

Academic Editor: Qi Shi

Copyright © 2015 Hao Zheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With the advantage of the reusability property of the virtualization technology, users can reuse various types and versions of existing operating systems and drivers in a virtual machine, so as to customize their application environment. In order to prevent users’ virtualization environments being impacted by driver faults in virtual machine, Chariot examines the correctness of driver’s write operations by the method of combining a driver’s write operation capture and a driver’s private access control table. However, this method needs to keep the write permission of shadow page table as read-only, so as to capture isolated driver’s write operations through page faults, which adversely affect the performance of the driver. Based on delaying setting frequently used shadow pages’ write permissions to read-only, this paper proposes an algorithm using shadow page cache to improve the performance of isolated drivers and carefully study the relationship between the performance of drivers and the size of shadow page cache. Experimental results show that, through the shadow page cache, the performance of isolated drivers can be greatly improved without impacting Chariot’s reliability too much.