Caching and Prefetching Policies Using Program Page Reference Patterns on a File System Layer for NAND Flash Memory

NAND 플래시 메모리용 파일 시스템 계층에서 프로그램의 페이지 참조 패턴을 고려한 캐싱 및 선반입 정책

In this thesis, we design and implement a Flash Cache Core Module (FCCM) which operates on the YAFFS NAND flash memory. The FCCM applies memory replacement policy and prefetching policy based on the page reference pattern of applications. Also, implement the Clean-First memory replacement technique considering the characteristics of flash memory. In this method the decision is made according to page hit to apply prefetched waiting area. The FCCM decrease I/O hit frequency up to 37%, Compared with the linux cache and prefetching policy. Also, it operated using less memory for prefetching(maximum 24% and average 16%) compared with the linux kernel.