From 32839a570568823b3a1128bb1ae6c5fe3e9870af Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 18 Dec 2013 22:16:19 +0000
Subject: [PATCH 024/114] config: Enable CONFIG_MEMCG, but leave it disabled
 (due to memory cost). Enable with cgroup_enable=memory.

---
 arch/arm/configs/bcmrpi_defconfig |  1 +
 kernel/cgroup.c                   | 23 +++++++++++++++++++++++
 mm/memcontrol.c                   |  1 +
 3 files changed, 25 insertions(+)

--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -19,6 +19,7 @@ CONFIG_CGROUP_FREEZER=y
 CONFIG_CGROUP_DEVICE=y
 CONFIG_CGROUP_CPUACCT=y
 CONFIG_RESOURCE_COUNTERS=y
+CONFIG_MEMCG=y
 CONFIG_BLK_CGROUP=y
 CONFIG_NAMESPACES=y
 CONFIG_SCHED_AUTOGROUP=y
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5322,6 +5322,29 @@ static int __init cgroup_disable(char *s
 }
 __setup("cgroup_disable=", cgroup_disable);
 
+static int __init cgroup_enable(char *str)
+{
+	struct cgroup_subsys *ss;
+	char *token;
+	int i;
+
+	while ((token = strsep(&str, ",")) != NULL) {
+		if (!*token)
+			continue;
+
+		for_each_subsys(ss, i) {
+			if (!strcmp(token, ss->name)) {
+				ss->disabled = 0;
+				printk(KERN_INFO "Enabling %s control group"
+					" subsystem\n", ss->name);
+				break;
+			}
+		}
+	}
+	return 1;
+}
+__setup("cgroup_enable=", cgroup_enable);
+
 static int __init cgroup_set_legacy_files_on_dfl(char *str)
 {
 	printk("cgroup: using legacy files on the default hierarchy\n");
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6208,6 +6208,7 @@ struct cgroup_subsys memory_cgrp_subsys
 	.bind = mem_cgroup_bind,
 	.legacy_cftypes = mem_cgroup_files,
 	.early_init = 0,
+	.disabled = 1,
 };
 
 #ifdef CONFIG_MEMCG_SWAP