Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1 | /* memcontrol.c - Memory Controller |
| 2 | * |
| 3 | * Copyright IBM Corporation, 2007 |
| 4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> |
| 5 | * |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame^] | 6 | * Copyright 2007 OpenVZ SWsoft Inc |
| 7 | * Author: Pavel Emelianov <xemul@openvz.org> |
| 8 | * |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/res_counter.h> |
| 21 | #include <linux/memcontrol.h> |
| 22 | #include <linux/cgroup.h> |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame^] | 23 | #include <linux/mm.h> |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 24 | |
| 25 | struct cgroup_subsys mem_cgroup_subsys; |
| 26 | |
| 27 | /* |
| 28 | * The memory controller data structure. The memory controller controls both |
| 29 | * page cache and RSS per cgroup. We would eventually like to provide |
| 30 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
| 31 | * to help the administrator determine what knobs to tune. |
| 32 | * |
| 33 | * TODO: Add a water mark for the memory controller. Reclaim will begin when |
| 34 | * we hit the water mark. |
| 35 | */ |
| 36 | struct mem_cgroup { |
| 37 | struct cgroup_subsys_state css; |
| 38 | /* |
| 39 | * the counter to account for memory usage |
| 40 | */ |
| 41 | struct res_counter res; |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame^] | 42 | /* |
| 43 | * Per cgroup active and inactive list, similar to the |
| 44 | * per zone LRU lists. |
| 45 | * TODO: Consider making these lists per zone |
| 46 | */ |
| 47 | struct list_head active_list; |
| 48 | struct list_head inactive_list; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 49 | }; |
| 50 | |
| 51 | /* |
| 52 | * A page_cgroup page is associated with every page descriptor. The |
| 53 | * page_cgroup helps us identify information about the cgroup |
| 54 | */ |
| 55 | struct page_cgroup { |
| 56 | struct list_head lru; /* per cgroup LRU list */ |
| 57 | struct page *page; |
| 58 | struct mem_cgroup *mem_cgroup; |
| 59 | }; |
| 60 | |
| 61 | |
| 62 | static inline |
| 63 | struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) |
| 64 | { |
| 65 | return container_of(cgroup_subsys_state(cont, |
| 66 | mem_cgroup_subsys_id), struct mem_cgroup, |
| 67 | css); |
| 68 | } |
| 69 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame^] | 70 | static inline |
| 71 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
| 72 | { |
| 73 | return container_of(task_subsys_state(p, mem_cgroup_subsys_id), |
| 74 | struct mem_cgroup, css); |
| 75 | } |
| 76 | |
| 77 | void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p) |
| 78 | { |
| 79 | struct mem_cgroup *mem; |
| 80 | |
| 81 | mem = mem_cgroup_from_task(p); |
| 82 | css_get(&mem->css); |
| 83 | mm->mem_cgroup = mem; |
| 84 | } |
| 85 | |
| 86 | void mm_free_cgroup(struct mm_struct *mm) |
| 87 | { |
| 88 | css_put(&mm->mem_cgroup->css); |
| 89 | } |
| 90 | |
| 91 | void page_assign_page_cgroup(struct page *page, struct page_cgroup *pc) |
| 92 | { |
| 93 | page->page_cgroup = (unsigned long)pc; |
| 94 | } |
| 95 | |
| 96 | struct page_cgroup *page_get_page_cgroup(struct page *page) |
| 97 | { |
| 98 | return page->page_cgroup; |
| 99 | } |
| 100 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 101 | static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft, |
| 102 | struct file *file, char __user *userbuf, size_t nbytes, |
| 103 | loff_t *ppos) |
| 104 | { |
| 105 | return res_counter_read(&mem_cgroup_from_cont(cont)->res, |
| 106 | cft->private, userbuf, nbytes, ppos); |
| 107 | } |
| 108 | |
| 109 | static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft, |
| 110 | struct file *file, const char __user *userbuf, |
| 111 | size_t nbytes, loff_t *ppos) |
| 112 | { |
| 113 | return res_counter_write(&mem_cgroup_from_cont(cont)->res, |
| 114 | cft->private, userbuf, nbytes, ppos); |
| 115 | } |
| 116 | |
| 117 | static struct cftype mem_cgroup_files[] = { |
| 118 | { |
| 119 | .name = "usage", |
| 120 | .private = RES_USAGE, |
| 121 | .read = mem_cgroup_read, |
| 122 | }, |
| 123 | { |
| 124 | .name = "limit", |
| 125 | .private = RES_LIMIT, |
| 126 | .write = mem_cgroup_write, |
| 127 | .read = mem_cgroup_read, |
| 128 | }, |
| 129 | { |
| 130 | .name = "failcnt", |
| 131 | .private = RES_FAILCNT, |
| 132 | .read = mem_cgroup_read, |
| 133 | }, |
| 134 | }; |
| 135 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame^] | 136 | static struct mem_cgroup init_mem_cgroup; |
| 137 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 138 | static struct cgroup_subsys_state * |
| 139 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) |
| 140 | { |
| 141 | struct mem_cgroup *mem; |
| 142 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame^] | 143 | if (unlikely((cont->parent) == NULL)) { |
| 144 | mem = &init_mem_cgroup; |
| 145 | init_mm.mem_cgroup = mem; |
| 146 | } else |
| 147 | mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL); |
| 148 | |
| 149 | if (mem == NULL) |
| 150 | return NULL; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 151 | |
| 152 | res_counter_init(&mem->res); |
| 153 | return &mem->css; |
| 154 | } |
| 155 | |
| 156 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, |
| 157 | struct cgroup *cont) |
| 158 | { |
| 159 | kfree(mem_cgroup_from_cont(cont)); |
| 160 | } |
| 161 | |
| 162 | static int mem_cgroup_populate(struct cgroup_subsys *ss, |
| 163 | struct cgroup *cont) |
| 164 | { |
| 165 | return cgroup_add_files(cont, ss, mem_cgroup_files, |
| 166 | ARRAY_SIZE(mem_cgroup_files)); |
| 167 | } |
| 168 | |
| 169 | struct cgroup_subsys mem_cgroup_subsys = { |
| 170 | .name = "memory", |
| 171 | .subsys_id = mem_cgroup_subsys_id, |
| 172 | .create = mem_cgroup_create, |
| 173 | .destroy = mem_cgroup_destroy, |
| 174 | .populate = mem_cgroup_populate, |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame^] | 175 | .early_init = 1, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 176 | }; |