Hi Don, On Thu, May 31, 2012 at 01:01:19PM -0700, Don Morris wrote: > We're a special pte, but a non-zero pfn. Being Xorg, I'm > assuming this is a remap of a kernel page into the user virtual > address space, but that's just a gut instinct. Since I read I reproduced it. The address is in /dev/mem, the other is a nonlinear ext4 map. > the above as "We don't expect to ever take spurious faults > on instantiated special ptes", I would think you'd need I would better skip VM_PFNMAP|VM_MIXEDMAP agreed, but it still shouldn't fail like this, vma_normal_page shouldn't error out on a pte_special. > Of course... I'm still really ramping up on this kernel, so > that could all be hokum, too. Hopefully it helps. It helps a lot, thanks! > I can dump the EFI memory map and whatnot to you if you > need it, but I think this is more of an algorithmic issue No need, I can reproduce. On the bright side, it looks totally harmless and you can ignore it. And if you run "echo 0 >/sys/kernel/mm/autonuma/knuma_scand/pmd" it seems to go away but I suggest to keep the default and ignore it, the pmd scan saves 1% of the overhead. I'll push a fix in the origin/autonuma branch as soon as I figure it out... Andrea -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>