On 2018/2/9 11:58, Yunlei He wrote:
> This patch remove unneed reada during build free nids.
> If few nids left, three will introduce a lot of no hit
> read io.

I guess it is due to be lack of commit c1fe3e981440 ("Revert "f2fs:
reuse nids more aggressively""), before that commit, we will update
.next_scan_nid randomly instead of updating it ascendingly, then
during __build_free_nids we may readahead NAT pages starting from
random position.

Could try that commit to check IO again?


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