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What is the concept of single or multi-threaded file system?

As you know, gingerbread cookies are going to take ext4 to replace YAFFS. The reason is that YAFFS is single-threaded . Can anyone explain what “single-threaded” means in the file system area? So ext4 is multithreaded? What aspect?

thank.

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Merlin's comment was correct. According to this document:

YAFFS is locked based on each partition at a high level. This is simpler than tracking lower level locks. The direct interface of Yaffs uses a single lock for all partitions.

IOW, only one stream can write to the entire section at once.

Linux, ext4, ( ).

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