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

[Zi Yan]

From: Zi Yan <z...@nvidia.com>

Signed-off-by: Zi Yan <z...@nvidia.com>
---
 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