From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Date: Wed, 11 Jan 2017 08:33:30 -0800 > Is there a cost in the hardware associated with doing this "ADI > checking"? For instance, instead of having this new mprotect() > interface, why not just always set TTE.mcd on all PTEs? If we did this then for every page mapped into userspace we'd have to explicitly set all of the tags to zero, otherwise we'd get TAG mismatch exceptions. That would be like clearing the every mapped anonymous page twice, or worse. -- 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>