On Thu, Jan 25, 2024 at 09:13:37AM -0700, Jens Axboe wrote: > > Nono, you don't understand. The plan is to remove GFP_NOIO > > entirely. Allocations should be done with GFP_KERNEL while under a > > memalloc_noio_save(). > > I do understand, but thanks for the vote of confidence. Place the > save/restore higher up, most likely actual IO submission isn't going to > be the only (or even major) allocation potentially needed for the IO. NOIO is defined as allocations that will not recurse into the I/O stack. So for anything block based, entering the block layer is literally the defined boundary where it should be used below. So no, wrapping every submit_bio into a context annotation doesn't make much sense.
