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% Registration Hotplug Memory Redux
% [2]Register/Submit Joel H Schopp (jschopp@austin.ibm.com)
Memory Hotplug is one of the most anticipated features
in the Linux Kernel. The purpose of memory hotplug is
memory replacement, dynamic workload management, or
Capacity on Demand of Partitioned/Virtual machines. In
this paper we discusses the history of Memory Hotplug
and the LinuxVM including mistakes made along the way
and technologies which have already been replaced. We
also discuss the current state of the art in Memory
Hotplug including user interfaces, \ident{CONFIG_SPARSEMEM},
the no bitmap buddy allocator, free area splitting
within zones, and memory migration on PPC64, x86-64,
and IA64. Additionally, we give a brief discussion on
the overlap between Memory Hotplug and other areas
including memory defragmentation and NUMA memory
management. Finally, we gaze into the crystal ball to
the future of Memory Hotplug.
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