On 24.11.21 14:23, Jason Gunthorpe wrote: > On Wed, Nov 24, 2021 at 09:57:32AM +0100, David Hildenbrand wrote: > >> Unfortunately it will only be a band aid AFAIU. I can rewrite my >> reproducer fairly easily to pin the whole 2M range first, pin a second >> time only a single page, and then unpin the 2M range, resulting in the >> very same way to block THP. (I can block some THP less because I always >> need the possibility to memlock 2M first, though). > > Oh! > > The issue is GUP always pins an entire compound, no matter how little > the user requests. That's a different issue. I make sure to split the compound page before pinning anything :) -- Thanks, David / dhildenb
