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1 | /* memcontrol.c - Memory Controller |
2 | * | |
3 | * Copyright IBM Corporation, 2007 | |
4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/res_counter.h> | |
18 | #include <linux/memcontrol.h> | |
19 | #include <linux/cgroup.h> | |
20 | ||
21 | struct cgroup_subsys mem_cgroup_subsys; | |
22 | ||
23 | /* | |
24 | * The memory controller data structure. The memory controller controls both | |
25 | * page cache and RSS per cgroup. We would eventually like to provide | |
26 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | |
27 | * to help the administrator determine what knobs to tune. | |
28 | * | |
29 | * TODO: Add a water mark for the memory controller. Reclaim will begin when | |
30 | * we hit the water mark. | |
31 | */ | |
32 | struct mem_cgroup { | |
33 | struct cgroup_subsys_state css; | |
34 | /* | |
35 | * the counter to account for memory usage | |
36 | */ | |
37 | struct res_counter res; | |
38 | }; | |
39 | ||
40 | /* | |
41 | * A page_cgroup page is associated with every page descriptor. The | |
42 | * page_cgroup helps us identify information about the cgroup | |
43 | */ | |
44 | struct page_cgroup { | |
45 | struct list_head lru; /* per cgroup LRU list */ | |
46 | struct page *page; | |
47 | struct mem_cgroup *mem_cgroup; | |
48 | }; | |
49 | ||
50 | ||
51 | static inline | |
52 | struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) | |
53 | { | |
54 | return container_of(cgroup_subsys_state(cont, | |
55 | mem_cgroup_subsys_id), struct mem_cgroup, | |
56 | css); | |
57 | } | |
58 | ||
59 | static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft, | |
60 | struct file *file, char __user *userbuf, size_t nbytes, | |
61 | loff_t *ppos) | |
62 | { | |
63 | return res_counter_read(&mem_cgroup_from_cont(cont)->res, | |
64 | cft->private, userbuf, nbytes, ppos); | |
65 | } | |
66 | ||
67 | static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft, | |
68 | struct file *file, const char __user *userbuf, | |
69 | size_t nbytes, loff_t *ppos) | |
70 | { | |
71 | return res_counter_write(&mem_cgroup_from_cont(cont)->res, | |
72 | cft->private, userbuf, nbytes, ppos); | |
73 | } | |
74 | ||
75 | static struct cftype mem_cgroup_files[] = { | |
76 | { | |
77 | .name = "usage", | |
78 | .private = RES_USAGE, | |
79 | .read = mem_cgroup_read, | |
80 | }, | |
81 | { | |
82 | .name = "limit", | |
83 | .private = RES_LIMIT, | |
84 | .write = mem_cgroup_write, | |
85 | .read = mem_cgroup_read, | |
86 | }, | |
87 | { | |
88 | .name = "failcnt", | |
89 | .private = RES_FAILCNT, | |
90 | .read = mem_cgroup_read, | |
91 | }, | |
92 | }; | |
93 | ||
94 | static struct cgroup_subsys_state * | |
95 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) | |
96 | { | |
97 | struct mem_cgroup *mem; | |
98 | ||
99 | mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL); | |
100 | if (!mem) | |
101 | return -ENOMEM; | |
102 | ||
103 | res_counter_init(&mem->res); | |
104 | return &mem->css; | |
105 | } | |
106 | ||
107 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, | |
108 | struct cgroup *cont) | |
109 | { | |
110 | kfree(mem_cgroup_from_cont(cont)); | |
111 | } | |
112 | ||
113 | static int mem_cgroup_populate(struct cgroup_subsys *ss, | |
114 | struct cgroup *cont) | |
115 | { | |
116 | return cgroup_add_files(cont, ss, mem_cgroup_files, | |
117 | ARRAY_SIZE(mem_cgroup_files)); | |
118 | } | |
119 | ||
120 | struct cgroup_subsys mem_cgroup_subsys = { | |
121 | .name = "memory", | |
122 | .subsys_id = mem_cgroup_subsys_id, | |
123 | .create = mem_cgroup_create, | |
124 | .destroy = mem_cgroup_destroy, | |
125 | .populate = mem_cgroup_populate, | |
126 | .early_init = 0, | |
127 | }; |