On Mon, Jul 21, 2014 at 10:41:59AM -0700, Tony Luck wrote: > On Mon, Jul 21, 2014 at 10:23 AM, Nishanth Aravamudan > <nacc@xxxxxxxxxxxxxxxxxx> wrote: > > It seems like the issue is the order of onlining of resources on a > > specific x86 platform? > > Yes. When we online a node the BIOS hits us with some ACPI hotplug events: > > First: Here are some new cpus > Next: Here is some new memory > Last; Here are some new I/O things (PCIe root ports, PCIe devices, > IOAPICs, IOMMUs, ...) > > So there is a period where the node is memoryless - although that will generally > be resolved when the memory hot plug event arrives ... that isn't guaranteed to > occur (there might not be any memory on the node, or what memory there is > may have failed self-test and been disabled). Right, but we could 'easily' capture that in arch code and make it look like it was done in a 'sane' order. No need to wreck the rest of the kernel to support this particular BIOS fuckup. -- 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>