Faculty Profiles - YAMAUCHI Toshihiro

Recent OS has a large number of device drivers. It is important to reduce cost for developing new device drivers in OS development. When we port an existing device driver into the OS which realizing device driver process to reduce the development cost, we need to not only port but also form it into process. In this paper, we show a method for converting an existing Linux LKM device driver into process in AnT operating system. Furthermore, we evaluated the proposal method using drivers such as the FD, Intel 1GbE, and Realtek 1GbE driver.

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Design of Sophisticated Periodic Execution Control for Embedded Systems

FURUKAWA Yuuki, TABATA Toshihiro, TANIGUCHI Hideo

IEICE technical report 109 ( 475 ) 523 - 528 2010.3

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

In embedded systems, a kind of the processing to be executed is limited, and a lot of processing are executed periodically. In such systems, we need to reduce the overhead of periodic execution control and the dispersion of its time. ART-Linux is proposed as one of the conventional real-time operating system that is used such as robot. In this paper, we show a periodic execution control of ART-Linux and clarify several problems. Next, we design a sophisticated periodic execution control to solve these problems of ART-Linux. Finally, we show the realization of the periodic execution control and the effect of it.

I/O Buffer Partition Method to Improve Execution Time of Priority Processing

TSUCHIYA Akiyoshi, TABATA Toshihiro, TANIGUCHI Hideo

72 ( 0 ) 99 - 100 2010.3

A proposal of physical memory exchange function to enable Zero-copy communication processing

KADO NAOFUMI, TABATA TOSHIHIRO, TANIGUCHI HIDEO

113 ( 8 ) H1 - H8 2010.1

Evaluation of Uniformity of Processing in Mechanism for Regulating Program Execution Speed in Library

SAKAI KOICHI, TABATA TOSHIHIRO, TANIGUCHI HIDEO, HAKOMORI SATOSHI

113 ( 14 ) N1 - N8 2010.1

A proposal of physical memory exchange function to enable Zero-copy communication processing

門直史, 田端利宏, 谷口秀夫

情報処理学会研究報告(CD-ROM) 2009 ( 5 ) 2010

Evaluation of Uniformity of Processing in Mechanism for Regulating Program Execution Speed in Library

境講一, 田端利宏, 谷口秀夫, 箱守聰

情報処理学会研究報告(CD-ROM) 2009 ( 5 ) 2010

Design of Upper Limit Function of Protected Area and Buffer Migration Function for a Directory Oriented Buffer Cache Mechanism

TABATA Toshihiro, TSUCHIYA Akiyoshi, YAMADA Katsuyasu, TANIGUCHI Hideo

IEICE technical report 109 ( 296 ) 43 - 48 2009.11

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Noticing that application programs handle files as a unit of input and output, we proposed a Directory Oriented Buffer Cache Mechanism. The proposed mechanism gives a high priority to important directories, which are associated with important jobs. Files in the important directories are given a high priority, and its blocks files are cached with the high priority. The proposed mechanism makes processing of important jobs frequently faster. However, the proposed mechanism degrades the performance of the processing in some cases due to three problems of it. This paper describes the three problems of the proposed mechanism. Then, this paper describes upper limit function of protected area and buffer migration function that solve the three problems.

Anti-spam e-mail method based on characteristic token ratio accounting for all tokens

UEMURA Masahiro, TABATA Toshihiro

IEICE technical report 109 ( 33 ) 27 - 32 2009.5