On Wed, 14 Dec 2016, Hannes Frederic Sowa wrote: > Wouldn't changing of the pages cause expensive TLB flushes? Yes so you would only want that feature if its realized at the page table level for debugging issues. Once you have memory registered with the hardware device then also the device could itself could perform snooping to realize that data was changed and thus abort the operation. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>