On Mon, Feb 11, 2019 at 12:16:40PM -0800, ira.weiny@intel.com wrote:
From: Ira Weiny <redacted>
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