以磁碟為基礎之大容量反及閘快閃記憶體模擬器

Abstract

快閃記憶體產品已經越來越廣泛應用於日常生活中。隨著快閃記憶體製成技術的改進，容量越來越大、價錢越來越低已經是確定的趨勢。快閃記憶體除了單純當作儲存裝置之外，被利用來當快取元件以增進系統效能也越來越普遍，例如英特爾公司提出的 Turbo Memory 技術。不只個人電腦上有這個趨勢，內嵌大容量快閃記憶體在手持式裝置上的情形也是越來越多。可見快閃記憶體將不僅扮演單純的儲存裝置，也會成為系統中的重要元件。不過由於記憶體技術裝置層設計上的限制，目前 Linux 上並沒有大容量的反及閘快閃記憶體模擬器，造成在研究和開發相關產品時有許多不便。因此我們設計並實做了一個以磁碟為基礎之大容量反及閘快閃記憶體模擬器來滿足這方面的需求，且透過模擬人類日常使用行為模式的實驗，證實這個模擬器有良好的效率。

Flash memory products are more and more popular in daily life. With the innovations of flash memory production technology, the capacity is sure to get larger and larger; the price is sure to become lower and lower. In addition to being applied to storage, flash is now also used as cache to improve system performance, such as Intel Turbo Memory Technology. There is such a tendency in terms of not only personal computers but also embedded large-capacity flash memory in hand-held devices. This shows that flash memory will be not just storage, and it will be an important component in system. However, under the limitation of the design of Memory Technology Device(MTD) layer, there has not been a large-capacity NAND flash simulator in Linux until now. It is very inconvenient to research and develop related products. In this thesis, we propose a Disk-Based Extra Large NAND Flash Simulator to meet the need. In terms of experiments in access patterns of human daily behavior, this simulator has a good performance.