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Commit c2974058 authored by Tang Chen's avatar Tang Chen Committed by Linus Torvalds
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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: default avatarTang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: default avatarYasuaki 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus 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