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Using shadow page cache to improve isolated drivers performance.

Hao Zheng1, Xiaoshe Dong1, Endong Wang2

  • 1Department of Computer Science and Technology, Xi'an Jiaotong University, Xianning West Road No. 28, Xi'an 710049, China.

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Summary
This summary is machine-generated.

This study enhances driver fault isolation in virtual machines by introducing a shadow page cache. This method improves isolated driver performance without significantly compromising system reliability.

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Area of Science:

  • Computer Science
  • Virtualization Technology
  • Operating Systems

Background:

  • Virtualization allows reusing operating systems and drivers in virtual machines for customized environments.
  • Driver faults in virtual machines can impact user environments.
  • Existing methods like Chariot use driver write operation capture and access control tables for correctness but incur performance overhead.

Purpose of the Study:

  • To improve the performance of isolated drivers in virtual machines.
  • To address the performance degradation caused by traditional driver isolation methods.
  • To investigate the effectiveness of a shadow page cache for enhancing driver performance.

Main Methods:

  • Proposed an algorithm utilizing a shadow page cache.
  • Delayed setting frequently used shadow pages' write permissions to read-only.
  • Studied the relationship between driver performance and shadow page cache size.
  • Implemented a method combining driver write operation capture and a private access control table.

Main Results:

  • The shadow page cache significantly improved the performance of isolated drivers.
  • The performance gains were achieved without substantial negative impact on the reliability of the Chariot system.
  • Experimental results demonstrated a clear correlation between cache size and performance improvement.

Conclusions:

  • The proposed shadow page cache algorithm effectively enhances isolated driver performance in virtual machines.
  • This approach offers a viable solution to mitigate performance issues associated with driver fault isolation.
  • The method balances performance improvements with acceptable reliability levels for virtualization environments.