> Well the GRU uses follow_page() instead of get_user_pages. Performance is 
quoted text
> a major issue for the GRU. 

Worse, the GRU takes its TLB faults from within an interrupt so we
use follow_page to prevent going to sleep.  That said, I think we
could probably use follow_page() with FOLL_GET set to accomplish the
requirements of mmu_notifier invalidate_range call.  Doesn't look too
promising for hugetlb pages.

Thanks,
Robin
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