On Mon, Feb 11, 2019 at 12:16:40PM -0800, ira.weiny@xxxxxxxxx wrote: > From: Ira Weiny <ira.weiny@xxxxxxxxx> > > NOTE: This series depends on my clean up patch to remove the write parameter > from gup_fast_permitted()[1] > > HFI1 uses get_user_pages_fast() due to it performance advantages. Like RDMA, > HFI1 pages can be held for a significant time. But get_user_pages_fast() does > not protect against mapping of FS DAX pages. If HFI1 can use the _fast varient, can't all the general RDMA stuff use it too? What is the guidance on when fast vs not fast should be use? Jason
