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by Zefiroj 661 days ago
The support for mTHP exists in upstream Linux, but the swap story is not quite there yet. THP availability also needs work and there are a few competing directions.

Supporting multiple page sizes well transparently is non-trivial.

For a recent summary on one of the approaches, TAO (THP Allocation Optimization), see this lwn article: https://lwn.net/Articles/974636/