[RFC PATCH 08/12] mm: use mirrorable to switch allocate mirrored memory

[Xishi Qiu]

Add a new interface in path /proc/sys/vm/mirrorable. When set to 1, it means
we should allocate mirrored memory for both user and kernel processes.

Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
---
 include/linux/mmzone.h | 1 +
 kernel/sysctl.c        | 9 +++++++++
 mm/page_alloc.c        | 1 +
 3 files changed, 11 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f82e3ae..20888dd 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -85,6 +85,7 @@ struct mirror_info {
 };
 
 extern struct mirror_info mirror_info;
+extern int sysctl_mirrorable;
 #  define is_migrate_mirror(migratetype) unlikely((migratetype) == MIGRATE_MIRROR)
 #else
 #  define is_migrate_mirror(migratetype) false
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2082b1a..dc2625e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1514,6 +1514,15 @@ static struct ctl_table vm_table[] = {
 		.extra2		= &one,
 	},
 #endif
+#ifdef CONFIG_MEMORY_MIRROR
+	{
+		.procname	= "mirrorable",
+		.data		= &sysctl_mirrorable,
+		.maxlen		= sizeof(sysctl_mirrorable),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+	},
+#endif
 	{
 		.procname	= "user_reserve_kbytes",
 		.data		= &sysctl_user_reserve_kbytes,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 249a8f6..63b90ca 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -212,6 +212,7 @@ int user_min_free_kbytes = -1;
 
 #ifdef CONFIG_MEMORY_MIRROR
 struct mirror_info mirror_info;
+int sysctl_mirrorable = 0;
 #endif
 
 static unsigned long __meminitdata nr_kernel_pages;
-- 
2.0.0


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