NVRAM-based method for efficiently constructing file system

Abstract

The present invention provides an NVRAM-based method for efficiently constructing a file system. The method comprises the following steps: S1: determining a type of a file operation of a file system, wherein the type of the file operation comprises: a file reading operation of a file, a non-persistent file writing operation, and a persistent file writing operation; and S2: if the type of the file operation is the non-persistent file writing operation, the file system writing contents of the non-persistent file writing operation into a dynamic random access memory (DRAM), updating a corresponding DRAM cache block index, and asynchronously flashing back the contents of the non-persistent file writing operation into a non-volatile random access memory (NVRAM) at a preset time point; and if the type of the file operation is not the non-persistent file writing operation, the file system directly copying related data between the NVRAM / DRAM and a user cache. According to the method, not only extra copy overheads and conventional software layer overheads can be avoided, but also write performance of the DRAM can be fully utilized to improve write performance of the NVRAM file system, thereby improving overall performance of the system.

Description

technical field [0001] The invention relates to the technical field of computer systems, in particular to an efficient file system construction method based on NVRAM. Background technique [0002] Novel NVRAM (Non-VolatileRandomAccessMemory, non-volatile random access memory) has the following characteristics: (1). It has non-volatile characteristics; (2). Compared with traditional DRAM (DynamicRandomAccessMemory, dynamic random access memory), its storage Higher density; (3). In terms of read and write performance, it is several orders of magnitude higher than traditional flash memory and hard disk, and the read and write performance is close to DRAM; (4). Compared with flash memory, it has a higher write life. These advantages allow system designers to build efficient persistent storage systems on top of NVRAM. [0003] Because NVRAM has efficient read and write performance, researchers in recent years have found that traditional disk and flash-based file systems are no l...

AI Technical Summary

Problems solved by technology

[0004] However, one of the main disadvantages of existing NVRAM memory devices is that the read and write performance is asymmetrical, and the write operation performance is an order of magnitude slower than the read operation performance

Therefore, copying file data directly between the user cache and the storage device will reduce the write performance of the file system, which will also lead to suboptimal file system performance.

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