On Wed, Feb 15, 2023 at 04:43:47PM -0700, Jens Axboe wrote: > By default, non-mq drivers do not support nowait. This causes io_uring > to use a slower path as the driver cannot be trust not to block. brd > can safely set the nowait flag, as worst case all it does is a NOIO > allocation. But a NOIO allocation can block. I think we need to do a GFP_NOWAIT allocation in brd_insert_page if the NOWAIT flag is set.
