@seanl OK. so the answer to stat overhead seems to be: Don't use stat, use something like inotify or kqueue, i.e. file change detection driven by filesystem events reported to userspace.
Notices by Stefan Sperling (stsp@mastodon.social)
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Stefan Sperling (stsp@mastodon.social)'s status on Wednesday, 11-Apr-2018 20:50:37 UTC Stefan Sperling -
Stefan Sperling (stsp@mastodon.social)'s status on Monday, 16-Oct-2017 08:12:13 UTC Stefan Sperling As #OpenBSD's de-facto wifi maintainer, I first learned about this WPA problem in June. A simple patch was provided which I could commit with slight modifications.
The original embargo was already 2 months long, and then extended again for 2 months.
The generall public (you) were left in the dark about this for at least 4 months.
This is a very sad state of affairs. It takes the industry much too long to apply a simple patch.