---

yaml
---
r: 83766
b: refs/heads/master
c: 8697d33
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c7ba5c9e8176704bfac0729875fa62798037584d
+refs/heads/master: 8697d33194faae6fdd6b2e799f6308aa00cfdf67

trunk/include/linux/memcontrol.h

@@ -22,6 +22,8 @@
 
 struct mem_cgroup;
 struct page_cgroup;
+struct page;
+struct mm_struct;
 
 #ifdef CONFIG_CGROUP_MEM_CONT
 
@@ -40,6 +42,7 @@ extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
 					struct mem_cgroup *mem_cont,
 					int active);
 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
+extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm);
 
 static inline void mem_cgroup_uncharge_page(struct page *page)
 {
@@ -84,6 +87,12 @@ static inline void mem_cgroup_move_lists(struct page_cgroup *pc,
 {
 }
 
+static inline int mem_cgroup_cache_charge(struct page *page,
+						struct mm_struct *mm)
+{
+	return 0;
+}
+
 #endif /* CONFIG_CGROUP_MEM_CONT */
 
 #endif /* _LINUX_MEMCONTROL_H */

trunk/mm/filemap.c

@@ -464,7 +464,7 @@ int add_to_page_cache(struct page *page, struct address_space *mapping,
 
 	if (error == 0) {
 
-		error = mem_cgroup_charge(page, current->mm);
+		error = mem_cgroup_cache_charge(page, current->mm);
 		if (error)
 			goto out;
 

trunk/mm/memcontrol.c

@@ -29,6 +29,8 @@
 #include <linux/spinlock.h>
 #include <linux/fs.h>
 
+#include <asm/uaccess.h>
+
 struct cgroup_subsys mem_cgroup_subsys;
 static const int MEM_CGROUP_RECLAIM_RETRIES = 5;
 
@@ -60,6 +62,7 @@ struct mem_cgroup {
 	 * spin_lock to protect the per cgroup LRU
 	 */
 	spinlock_t lru_lock;
+	unsigned long control_type;	/* control RSS or RSS+Pagecache */
 };
 
 /*
@@ -82,6 +85,15 @@ struct page_cgroup {
 					/* mapped and cached states     */
 };
 
+enum {
+	MEM_CGROUP_TYPE_UNSPEC = 0,
+	MEM_CGROUP_TYPE_MAPPED,
+	MEM_CGROUP_TYPE_CACHED,
+	MEM_CGROUP_TYPE_ALL,
+	MEM_CGROUP_TYPE_MAX,
+};
+
+static struct mem_cgroup init_mem_cgroup;
 
 static inline
 struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
@@ -139,18 +151,18 @@ struct page_cgroup *page_get_page_cgroup(struct page *page)
 		(page->page_cgroup & ~PAGE_CGROUP_LOCK);
 }
 
-void __always_inline lock_page_cgroup(struct page *page)
+static void __always_inline lock_page_cgroup(struct page *page)
 {
 	bit_spin_lock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
 	VM_BUG_ON(!page_cgroup_locked(page));
 }
 
-void __always_inline unlock_page_cgroup(struct page *page)
+static void __always_inline unlock_page_cgroup(struct page *page)
 {
 	bit_spin_unlock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
 }
 
-void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
+static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
 {
 	if (active)
 		list_move(&pc->lru, &pc->mem_cgroup->active_list);
@@ -365,6 +377,22 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm)
 	return -ENOMEM;
 }
 
+/*
+ * See if the cached pages should be charged at all?
+ */
+int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm)
+{
+	struct mem_cgroup *mem;
+	if (!mm)
+		mm = &init_mm;
+
+	mem = rcu_dereference(mm->mem_cgroup);
+	if (mem->control_type == MEM_CGROUP_TYPE_ALL)
+		return mem_cgroup_charge(page, mm);
+	else
+		return 0;
+}
+
 /*
  * Uncharging is always a welcome operation, we never complain, simply
  * uncharge.
@@ -375,6 +403,10 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
 	struct page *page;
 	unsigned long flags;
 
+	/*
+	 * This can handle cases when a page is not charged at all and we
+	 * are switching between handling the control_type.
+	 */
 	if (!pc)
 		return;
 
@@ -425,6 +457,60 @@ static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
 				mem_cgroup_write_strategy);
 }
 
+static ssize_t mem_control_type_write(struct cgroup *cont,
+			struct cftype *cft, struct file *file,
+			const char __user *userbuf,
+			size_t nbytes, loff_t *pos)
+{
+	int ret;
+	char *buf, *end;
+	unsigned long tmp;
+	struct mem_cgroup *mem;
+
+	mem = mem_cgroup_from_cont(cont);
+	buf = kmalloc(nbytes + 1, GFP_KERNEL);
+	ret = -ENOMEM;
+	if (buf == NULL)
+		goto out;
+
+	buf[nbytes] = 0;
+	ret = -EFAULT;
+	if (copy_from_user(buf, userbuf, nbytes))
+		goto out_free;
+
+	ret = -EINVAL;
+	tmp = simple_strtoul(buf, &end, 10);
+	if (*end != '\0')
+		goto out_free;
+
+	if (tmp <= MEM_CGROUP_TYPE_UNSPEC || tmp >= MEM_CGROUP_TYPE_MAX)
+		goto out_free;
+
+	mem->control_type = tmp;
+	ret = nbytes;
+out_free:
+	kfree(buf);
+out:
+	return ret;
+}
+
+static ssize_t mem_control_type_read(struct cgroup *cont,
+				struct cftype *cft,
+				struct file *file, char __user *userbuf,
+				size_t nbytes, loff_t *ppos)
+{
+	unsigned long val;
+	char buf[64], *s;
+	struct mem_cgroup *mem;
+
+	mem = mem_cgroup_from_cont(cont);
+	s = buf;
+	val = mem->control_type;
+	s += sprintf(s, "%lu\n", val);
+	return simple_read_from_buffer((void __user *)userbuf, nbytes,
+			ppos, buf, s - buf);
+}
+
 static struct cftype mem_cgroup_files[] = {
 	{
 		.name = "usage_in_bytes",
@@ -442,6 +528,11 @@ static struct cftype mem_cgroup_files[] = {
 		.private = RES_FAILCNT,
 		.read = mem_cgroup_read,
 	},
+	{
+		.name = "control_type",
+		.write = mem_control_type_write,
+		.read = mem_control_type_read,
+	},
 };
 
 static struct mem_cgroup init_mem_cgroup;
@@ -464,6 +555,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
 	INIT_LIST_HEAD(&mem->active_list);
 	INIT_LIST_HEAD(&mem->inactive_list);
 	spin_lock_init(&mem->lru_lock);
+	mem->control_type = MEM_CGROUP_TYPE_ALL;
 	return &mem->css;
 }
 

trunk/mm/swap_state.c

@@ -78,7 +78,7 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask)
 	error = radix_tree_preload(gfp_mask);
 	if (!error) {
 
-		error = mem_cgroup_charge(page, current->mm);
+		error = mem_cgroup_cache_charge(page, current->mm);
 		if (error)
 			goto out;