The scheduler is an internal detail and shouldn't be exposed to the headers in ext. It would transitively include more headers which are not in ext, making it not self contained. Change-Id: I8384cde9d19363953ffd0c91e7d8d27f8f79a570 Reviewed-on: https://gem5-review.googlesource.com/c/13336 Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com>