On Wed, Nov 24, 2021 at 02:25:09PM +0100, David Hildenbrand wrote: > 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 :) ?? Where is that done in GUP? Jason
