From c2974058a9caa82c9dd9e1e11e4f2c6ce42ff17e Mon Sep 17 00:00:00 2001 From: Tang Chen Date: Tue, 18 Dec 2012 14:21:33 -0800 Subject: 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 Reviewed-by: Yasuaki Ishimatsu Cc: Lai Jiangshan Cc: Wen Congyang Cc: Ingo Molnar [akpm@linux-foundation.org: tweak help text] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/Kconfig | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'mm/Kconfig') 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 -- cgit v1.2.1