On Mon, 13 Jun 2011 10:55:59 -0700 "Michael K. Edwards" <m.k.edwards@xxxxxxxxx> wrote: > As far as I can tell, there is not yet any way to get real > cache-bypassing write-combining from userland in a mainline kernel, > for x86/x86_64 or ARM. Well only if things are really broken. sysfs exposes _wc resource files to allow userland drivers to map a given PCI BAR using write combining, if the underlying platform supports it. Similarly, userland mapping of GEM objects through the GTT are supposed to be write combined, though I need to verify this (we've had trouble with it in the past). -- Jesse Barnes, Intel Open Source Technology Center -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>