linux-kernel - [PATCH v2 1/2] memory-hotplug: Add help info for CONFIG_MOVABLE

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Message-Id: <1355708488-2913-2-git-send-email-tangchen@cn.fujitsu.com>
Date:	Mon, 17 Dec 2012 09:41:27 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	akpm@...ux-foundation.org, isimatu.yasuaki@...fujitsu.com,
	kamezawa.hiroyu@...fujitsu.com, mel@....ul.ie,
	tangchen@...fujitsu.com, laijs@...fujitsu.com,
	wency@...fujitsu.com, mingo@...e.hu, penberg@...nel.org
Cc:	torvalds@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] memory-hotplug: Add help info for CONFIG_MOVABLE_NODE option

This patch adds help info for CONFIG_MOVABLE_NODE option.

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

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Acked-by: Ingo Molnar <mingo@...nel.org>
---
 mm/Kconfig |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index 71259e0..4913333 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -150,6 +150,16 @@ config MOVABLE_NODE
 	depends on X86_64
 	depends on NUMA
 	depends on BROKEN
+	help
+	  Allow a node to have only movable memory. Pages used by the kernel,
+	  such as direct mapping pages can not be migrated. So the corresponding
+	  memory device can not be hotplugged. This option allows users to online
+	  all the memory of a node as movable memory so that the whole node can
+	  be hot-unplugged. Users who don't use the 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
-- 
1.7.10.1

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