On 08/12/2013 10:01 AM, Tang Chen wrote: >> >>> I'm just thinking of a more extreme case. For example, if a machine >>> has only one node hotpluggable, and the kernel resides in that node. >>> Then the system has no hotpluggable node. >> >> Yeah, sure, then there's no way that node can be hotpluggable and the >> right thing to do is booting up the machine and informing the userland >> that memory is not hotpluggable. >> >>> If we can prevent the kernel from using hotpluggable memory, in such >>> a machine, users can still do memory hotplug. >>> >>> I wanted to do it as generic as possible. But yes, finding out the >>> nodes the kernel resides in and make it unhotpluggable can work. >> >> Short of being able to remap memory under the kernel, I don't think >> this can be very generic and as a compromise trying to keep as many >> hotpluggable nodes as possible doesn't sound too bad. > > I think making one of the node hotpluggable is better. But OK, it is > no big deal. There won't be such machine in reality, I think. :) > The user may very well have configured a system with mirrored memory for the kernel node as that will be non-hotpluggable, but not for the others. One can wonder how much that actually buys in real life, but still... -hpa -- 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>