[PATCH V2 2/4] munmap: sysctl extension for tunable parameter

[Geunsik Lim <leemgs1@gmail.com>]

From: Geunsik Lim <geunsik.lim@samsung.com>

Support sysctl interface(tunalbe parameter) to find a suitable munmap
operation unit at runtime favoringly

* sysctl: An interface for examining and dynamically changing munmap opearon
          size parameters in Linux. In Linux, the sysctl is implemented as
	  a wrapper around file system routines that access contents of files
	  in the /proc

Signed-off-by: Geunsik Lim <geunsik.lim@samsung.com>
Acked-by: Hyunjin Choi <hj89.choi@samsung.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Steven Rostedt <rostedt@redhat.com>
CC: Hugh Dickins <hughd@google.com>
CC: Randy Dunlap <randy.dunlap@oracle.com>
CC: Ingo Molnar <mingo@elte.hu>
---
 kernel/sysctl.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c0bb324..9b85041 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -56,6 +56,7 @@
 #include <linux/kprobes.h>
 #include <linux/pipe_fs_i.h>
 #include <linux/oom.h>
+#include <linux/munmap_unit_size.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -1278,6 +1279,15 @@ static struct ctl_table vm_table[] = {
 		.proc_handler	= mmap_min_addr_handler,
 	},
 #endif
+#ifdef CONFIG_MMU
+	{
+		.procname	= "munmap_unit_size",
+		.data		= &sysctl_munmap_unit_size,
+		.maxlen		= sizeof(unsigned long),
+		.mode		= 0644,
+		.proc_handler	= munmap_unit_size_handler,
+	},
+#endif
 #ifdef CONFIG_NUMA
 	{
 		.procname	= "numa_zonelist_order",
-- 
1.7.3.4

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