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대한임베디드공학회논문지 = IEMEK Journal of embedded systems and applications v.13 no.5, 2018년, pp.269 - 277  
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연산 특성을 고려한 향상된 적응적 가비지 컬렉션 정책
An Advanced Adaptive Garbage Collection Policy by Considering the Operation Characteristics

박송화   (LIG Nex1  ); 이정훈   (LIG Nex1  ); 이원오   (LIG Nex1  ); 김현우   (LIG Nex1  );
  • 초록

    NAND flash memory has widely been used because of non-volatility, low power consumption and fast access time. However, it suffers from inability to provide update-in-place and the erase cycle is limited. The unit of read/write operation is a page and the unit of erase operation is a block. Moreover erase operation is slower than other operations. We proposed the Adaptive Garbage Collection (called "AGC") policy which focuses on not only reducing garbage collection process time for real-time guarantee but also wear-leveling for a flash memory lifetime. The AGC performs better than Cost-benefit policy and Greedy policy. But the AGC does not consider the operation characteristics. So we proposed the Advanced Adaptive Garbage Collection (called "A-AGC") policy which considers the page write operation count and block erase operation count. The A-AGC reduces the write operations by considering the data update frequency and update data size. Also, it reduces the erase operations by considering the file fragmentation. We implemented the A-AGC policy and measured the performance compared with the AGC policy. Simulation results show that the A-AGC policy performs better than AGC, specially for append operation.


  • 주제어

    NAND flash memory .   Garbage collection .   Wear-leveling.  

  • 참고문헌 (8)

    1. F. Douglis, R Caceres, M.F. Kaashock, P. Krishnan, K, Li, B, Marsh, J. Tauber, "Storage Alternative for Mobile Computers," Proceedings of the 1st USENIX Symposium on Operating System Design and Implementation, pp. 25-37, 1994. 
    2. M.L. Chiang, P.C.H, Lee, R.C Chang, "Managing Flash Memory in Personal Communication Devices," Proceedings of IEEE Symposium on Consumer Electronics, pp. 177-182, 1997, 
    3. M.L. Chiang, RC .Chang, "Cleaning Policies in Mobile Computers Using Flash Memory," Journal of System and Software, Vol. 48, No. 3, pp. 213-231, 1999. 
    4. A. Kawaguchi, S, Nishioka, H. Motoda "A Flash Memory Based File System," Proceedings of 1995 USENIX Technical Conference, pp. 155-164, 1995. 
    5. Y.H. Jang, S.H. Kim, S.H. Hwang, M.S. Lee, C.H. Park, "Tracking Cold Blocks for Static Wear Leveling in FTL-based NAND Flash Memory," IEMEK Journal of Embedded Systems and Applications, Vol. 12, No.3, pp. 185-192, 2017 (in Korean). 
    6. S.H. Park, JH. Lee, W.O. Lee, H.E. Kim, “A Adaptive Garbage Collection Policy for Flash-Memory Storage System in Embedded System,” IEMEK Journal of Embedded Systems and Applications, Vol. 12, No. 3, pp. 121-130, 2017 (in Korean). 
    7. V. Prabhakaran, T. Wobber, "SSD Extension for DiskSim Simulation Environment." Microsoft Research 2009. 
    8. K9GAG08UOM 2G x 8bit MLC NAND Flash Memory Data Sheet, Samsung Electronics, https://www.samsung.com. 2007. 

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