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authorTang Chen <tangchen@cn.fujitsu.com>2012-12-18 14:21:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-18 15:02:12 -0800
commitc2974058a9caa82c9dd9e1e11e4f2c6ce42ff17e (patch)
tree5dccd1c1bfb43d24eaaf6d59850a78da4edc9055
parent0bb2c7637ef0db4f44528698fa725179fb4917ad (diff)
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>
-rw-r--r--mm/Kconfig13
1 files changed, 12 insertions, 1 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 71259e052ce8..278e3ab1f169 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -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