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I suppose they'll leverage 'function multi-version'[1], as Clear Linux already does[2] to enable extra instructions on the big cores.

[1]: `target_clones` -> https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attribute...

[2]: https://github.com/clearlinux/make-fmv-patch

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That seems hard to do with preemptive scheduling. AFAIK, the decision is on function level, and done at startup. Even if you can decide on call-time, it's only function level, and the preemption can happen mid-function.

That only works if your code is never migrated between cores.

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