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

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Date:   Wed,  3 Apr 2019 19:00:27 -0700
From:   Zi Yan <zi.yan@...t.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Keith Busch <keith.busch@...el.com>,
        Fengguang Wu <fengguang.wu@...el.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Daniel Jordan <daniel.m.jordan@...cle.com>,
        Michal Hocko <mhocko@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        John Hubbard <jhubbard@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Nitin Gupta <nigupta@...dia.com>,
        Javier Cabezas <jcabezas@...dia.com>,
        David Nellans <dnellans@...dia.com>, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH 06/25] mm: migrate: Make the number of copy threads adjustable via sysctl.

From: Zi Yan <ziy@...dia.com>

Signed-off-by: Zi Yan <ziy@...dia.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