The last time I did it for fs.h et al (this meant pulling the fs.h and
sched.h codependancy apart), it got 2.4 compiles back down to 2.2 compile
times (3m -> 2m45s maybe 2m30s iirc) -- about a 10% drop in compile time.
It's even more noticeable when you're doing a fully blown modular kernel
build as distributions do.
-ben
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