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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: 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>
This commit is contained in:
Tang Chen 2012-12-18 14:21:33 -08:00 committed by Linus Torvalds
parent 0bb2c7637e
commit c2974058a9
1 changed files with 12 additions and 1 deletions
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mm/Kconfig
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@ -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