Commit c2974058 authored Dec 18, 2012 by Tang Chen Committed by Linus Torvalds Dec 18, 2012

memory-hotplug: document and enable CONFIG_MOVABLE_NODE



Add help info for CONFIG_MOVABLE_NODE and permit its selection.

This option allows the user to online all memory of a node as movable
memory.  So that the whole node can be hotplugged.  Users who don't use
the hotplug feature are also fine with this option on since they won't
online memory as movable.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
[akpm@linux-foundation.org: tweak help text]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 0bb2c763

mm/Kconfig

+12 −1

Original line number	Diff line number	Diff line
		@@ -149,7 +149,18 @@ config MOVABLE_NODE
		depends on NO_BOOTMEM
		depends on X86_64
		depends on NUMA
		depends on BROKEN
		default n
		help
		Allow a node to have only movable memory. Pages used by the kernel,
		such as direct mapping pages cannot be migrated. So the corresponding
		memory device cannot be hotplugged. This option allows users to
		online all the memory of a node as movable memory so that the whole
		node can be hotplugged. Users who don't use the memory hotplug
		feature are fine with this option on since they don't online memory
		as movable.

		Say Y here if you want to hotplug a whole node.
		Say N here if you want kernel to use memory on all nodes evenly.

		# eventually, we can have this option just 'select SPARSEMEM'
		config MEMORY_HOTPLUG

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