On Thu, May 02, 2024 at 03:34:08PM -0300, Jason Gunthorpe wrote: > IMHO pin_user_pages() should sleep and spin in an interruptable sleep killable, not interruptible. Otherwise SIGWINCH and SIGALRM can result an early return. > until we get all the migrations done. Not sure how hard it would be to > add some kind of proper waiting event sleep? ummmmm. We have a "has waiters" bit in the folio. So on every call to folio_put(), we could check that bit and wake up any waiters. I need to think about that; right now, we only use it for unlock and end_writeback. Making folio_put() heavier is, well, quite a lot of call-sites.
