On Wed, 2010-04-07 at 16:14 +0900, KOSAKI Motohiro wrote: > > Desktop already uses similar features via PCI mmap > > attributes and such, not to mention MSR settings on > > x86. > > Probably I haven't catch your mention. Why userland process > need to change PCI mmap attribute by mmap(2)? It seems kernel issue. There are cases where the userspace based driver needs to control attributes such as write combining, or even cachability when mapping PCI devices directly into userspace. It's not -that- common, though X still does it on a number of platforms, and there are people still trying to run PCI drivers in userspace ;-) But regardless. I don't see why HPC or Embedded would have to be qualified as "crap" and not warrant our full attention into devising something sane and clean anyways. Cheers, Ben. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>