[RFC PATCH 06/25] mm: migrate: Make the number of copy threads adjustable via sysctl.

[Zi Yan]

From: Zi Yan <ziy@xxxxxxxxxx>

Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
---
 kernel/sysctl.c | 9 +++++++++
 mm/copy_page.c  | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 3d8490e..0eae0b8 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -102,6 +102,7 @@
 #if defined(CONFIG_SYSCTL)
 
 extern int accel_page_copy;
+extern unsigned int limit_mt_num;
 
 /* External variables not in a header file. */
 extern int suid_dumpable;
@@ -1441,6 +1442,14 @@ static struct ctl_table vm_table[] = {
 		.extra1		= &zero,
 		.extra2		= &one,
 	},
+	{
+		.procname	= "limit_mt_num",
+		.data		= &limit_mt_num,
+		.maxlen		= sizeof(limit_mt_num),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &zero,
+	},
 	 {
 		.procname	= "hugetlb_shm_group",
 		.data		= &sysctl_hugetlb_shm_group,
diff --git a/mm/copy_page.c b/mm/copy_page.c
index 9cf849c..6665e3d 100644
--- a/mm/copy_page.c
+++ b/mm/copy_page.c
@@ -23,7 +23,7 @@
 #include <linux/freezer.h>
 
 
-const unsigned int limit_mt_num = 4;
+unsigned int limit_mt_num = 4;
 
 /* ======================== multi-threaded copy page ======================== */
 
-- 
2.7.4