> Dave Hansen wrote:Not only to avoid fragmentation, but also for notification to user level for preparing memory add event. When memory is added, there is a notification via udev for each memory device. In our box, one node which includes some DIMMs and CPUs can be added by hot-add, and there is another notification for 1 node by ACPI's container device. After user level check for preparing, user(or shell script) can online memory. IIRC, some of user level application would require this notification. ex) resource manager over physical/logical partitioning. Basically, I hope there is no change for user level interface between physical hotplug and Xen as much as possible. So, I would like to make sense why memory is added "on-demand" on Xen. I thought the hypervisor gathers a section's memory and moves all of them from one guest to another at a time. Its gathering time may be long time. But, each per page moving may cause of fragmentation, if my understanding is correct.... I don't make sense both your idea yet. Could you tell me more? One of them may be same to my understanding. But I'm not sure. Thanks. -- Yasunori Goto --
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