From 78fb74669e80883323391090e4d26d17fe29488f Mon Sep 17 00:00:00 2001
From: Pavel Emelianov <xemul@openvz.org>
Date: Thu, 7 Feb 2008 00:13:51 -0800
Subject: Memory controller: accounting setup

Basic setup routines, the mm_struct has a pointer to the cgroup that
it belongs to and the the page has a page_cgroup associated with it.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/memcontrol.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 4 deletions(-)

(limited to 'mm/memcontrol.c')

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 80e48cd9d0c..4d4805eb37c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3,6 +3,9 @@
  * Copyright IBM Corporation, 2007
  * Author Balbir Singh <balbir@linux.vnet.ibm.com>
  *
+ * Copyright 2007 OpenVZ SWsoft Inc
+ * Author: Pavel Emelianov <xemul@openvz.org>
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
@@ -17,6 +20,7 @@
 #include <linux/res_counter.h>
 #include <linux/memcontrol.h>
 #include <linux/cgroup.h>
+#include <linux/mm.h>
 
 struct cgroup_subsys mem_cgroup_subsys;
 
@@ -35,6 +39,13 @@ struct mem_cgroup {
 	 * the counter to account for memory usage
 	 */
 	struct res_counter res;
+	/*
+	 * Per cgroup active and inactive list, similar to the
+	 * per zone LRU lists.
+	 * TODO: Consider making these lists per zone
+	 */
+	struct list_head active_list;
+	struct list_head inactive_list;
 };
 
 /*
@@ -56,6 +67,37 @@ struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
 				css);
 }
 
+static inline
+struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
+{
+	return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
+				struct mem_cgroup, css);
+}
+
+void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p)
+{
+	struct mem_cgroup *mem;
+
+	mem = mem_cgroup_from_task(p);
+	css_get(&mem->css);
+	mm->mem_cgroup = mem;
+}
+
+void mm_free_cgroup(struct mm_struct *mm)
+{
+	css_put(&mm->mem_cgroup->css);
+}
+
+void page_assign_page_cgroup(struct page *page, struct page_cgroup *pc)
+{
+	page->page_cgroup = (unsigned long)pc;
+}
+
+struct page_cgroup *page_get_page_cgroup(struct page *page)
+{
+	return page->page_cgroup;
+}
+
 static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft,
 			struct file *file, char __user *userbuf, size_t nbytes,
 			loff_t *ppos)
@@ -91,14 +133,21 @@ static struct cftype mem_cgroup_files[] = {
 	},
 };
 
+static struct mem_cgroup init_mem_cgroup;
+
 static struct cgroup_subsys_state *
 mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
 {
 	struct mem_cgroup *mem;
 
-	mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
-	if (!mem)
-		return -ENOMEM;
+	if (unlikely((cont->parent) == NULL)) {
+		mem = &init_mem_cgroup;
+		init_mm.mem_cgroup = mem;
+	} else
+		mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
+
+	if (mem == NULL)
+		return NULL;
 
 	res_counter_init(&mem->res);
 	return &mem->css;
@@ -123,5 +172,5 @@ struct cgroup_subsys mem_cgroup_subsys = {
 	.create = mem_cgroup_create,
 	.destroy = mem_cgroup_destroy,
 	.populate = mem_cgroup_populate,
-	.early_init = 0,
+	.early_init = 1,
 };
-- 
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