linux-kernel - [RFC PATCH 09/12] mm: enable allocate mirrored memory at boot time

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Date:	Thu, 4 Jun 2015 21:03:23 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Xishi Qiu <qiuxishi@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<nao.horiguchi@...il.com>, Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, <mingo@...e.hu>,
	Xiexiuqi <xiexiuqi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Luck, Tony" <tony.luck@...el.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 09/12] mm: enable allocate mirrored memory at boot time

Add a boot option called "mirrorable" to allocate mirrored memory at boot time
(after bootmem free).

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 mm/page_alloc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 63b90ca..d4d2066 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -213,6 +213,13 @@ int user_min_free_kbytes = -1;
 #ifdef CONFIG_MEMORY_MIRROR
 struct mirror_info mirror_info;
 int sysctl_mirrorable = 0;
+
+static int __init set_mirrorable(char *p)
+{
+	sysctl_mirrorable = 1;
+	return 0;
+}
+early_param("mirrorable", set_mirrorable);
 #endif
 
 static unsigned long __meminitdata nr_kernel_pages;
-- 
2.0.0


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