Method and system for identifying upper layer application through flash translation layer

Abstract

The invention is suitable for the technical field of memory and provides a method and a system for recognizing an upper-layer application by a flash memory transfer layer. The method comprises the following steps of: establishing a sequential write screening list on the flash memory transfer layer, and recording the logic block addressing of the next write instruction of the upper-layer application by the sequential write screening list; establishing a sequential write candidate list on the flash memory transfer layer, and recording a write instruction issued by the upper-layer application by the sequential write candidate list; and when the write instruction is issued by the upper-layer application, judging the type of the write instruction issued by the upper-layer application according to the records of the sequential write screening list and the sequential write candidate list. Therefore, the type of the write instruction issued by the upper-layer application can be recognized by the flash memory transfer layer.

Description

technical field [0001] The invention relates to the field of storage technology, in particular to a method and system for identifying upper-layer applications through a flash conversion layer. Background technique [0002] NAND Flash is a kind of Flash memory, which is non-volatile, anti-vibration, fast storage speed, and low power consumption, making it widely used in portable mobile devices such as mobile phones and digital cameras. However, there is a limitation in NAND Flash: it needs to be erased before writing, the unit of data read and write is page, the unit of erasing is block, and the erasing times of blocks are limited; therefore, the file system cannot directly access it. [0003] FTL (FlashTranslationLayer Flash Translation Layer) is the translation layer between the file system and NANDFlash, so that the file system can access NANDFlash like a disk. The hierarchical relationship between the file system and FTL is as follows: figure 1 Shown: [0004] FTL cons...

AI Technical Summary

Problems solved by technology

Therefore, for sequential writing, block mapping can save memory space, and the data block and log block adopt a one-to-one correspondence relationship, and the garbage collection efficiency is high; for random writing, page mapping is generally used, and the log block corresponds to multiple data blocks, improving the efficiency of garbage collection. The utilization of log blocks, but the efficiency of garbage collection is not high

The current common FTL algorithm only provides a correspondence between data blocks and log blocks, and rarely has a mechanism for distinguishing upper-layer applications. Therefore, it cannot satisfy the following requirements: figure 1 Complex applications of general-purpose computer systems shown

[0006] To sum up, it can be seen that the existing technology of flash translation layer to identify upper-layer applications obviously has inconvenience and defects in actual use, so it is necessary to improve it

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