usenix conference policies
* Cosy: Develop in User-Land, Run in Kernel-Mode
User applications that move a lot of data across the user-kernel boundary suffer from a serious performance penalty. We provide a framework, Compound System Calls (Cosy), to enhance the performance of such user-level applications. Cosy provides a user-friendly mechanism to execute the data-intensive code segment of the application in the kernel. This is achieved by aggregating the data-intensive system calls and the intermediate code into a compound. This compound is executed in the kernel, avoiding redundant data copies.
A Cosy version of GCC makes the formation of a Cosy compound simple. Cosy-GCC automatically converts user-defined code segments into compounds. To ensure the security of the kernel, we use a combination of static and dynamic checks. We limit the execution time of the application in the kernel by using a modified preemptible kernel. Kernel data integrity is assured by performing necessary dynamic checks. Static checks are enforced by Cosy-GCC. To study the performance benefits of our Cosy prototype, we instrumented applications such as grep and ls. These application showed an improvement of 20–80%. Our current work focuses on faster and secure execution of entire programs in the kernel without source code modification.
author = {Amit Purohit and Charles P. Wright and Joseph Spadavecchia and Erez Zadok},
title = {* Cosy: Develop in {User-Land}, Run in {Kernel-Mode}},
booktitle = {9th Workshop on Hot Topics in Operating Systems (HotOS IX)},
year = {2003},
address = {Lihue, HI},
url = {https://www.usenix.org/conference/hotos-ix/cosy-develop-user-land-run-kernel-mode},
publisher = {USENIX Association},
month = may
}
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