On Sun, Jan 10, 2021 at 11:26:57PM -0800, John Hubbard wrote: > So: > > FOLL_PIN: would use DMA_PIN_COUNTING_BIAS to increment page refcount. > These are long term pins for dma. > > FOLL_GET: would use GUP_PIN_COUNTING_BIAS to increment page refcount. > These are not long term pins. Do we have any places yet that care about the long-term-ness? The only place long term would matter is if something is waiting for the page ref count to drop. Jason
