RE:(2) [f2fs-dev] [RFC PATCH] f2fs: add support single node section mode

[Daejun Park]

> Hi Daejun,
> 1. It is not compatible with "F2FS_OPTION(sbi).active_logs == 2".
> 2. Once has_enough_free_secs is false, F2FS cannot restore to multi-node
> sections even after has_enough_free_secs becomes true and the filesystem
> is unmounted and remounted. This seems unreasonable.

Hi Yongpeng Yang,

1. Yes, I will modify it so that it only applies when active_log is 6.
2. This technique is effective when utilization is high. Therefore, in my scenario, I assumed that only heavy users would use this option. So I assumed that the free section would not be sufficiently secured even after that.
Futhermore, if a new section is allocated to deactivate a single node whenever there is free space, then soon again insufficient free space may occur, resulting in more unnecessary GC.

Thanks,
Daejun