Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 1 | /* |
| 2 | * resource cgroups |
| 3 | * |
| 4 | * Copyright 2007 OpenVZ SWsoft Inc |
| 5 | * |
| 6 | * Author: Pavel Emelianov <xemul@openvz.org> |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/parser.h> |
| 12 | #include <linux/fs.h> |
| 13 | #include <linux/res_counter.h> |
| 14 | #include <linux/uaccess.h> |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 15 | #include <linux/mm.h> |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 16 | |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 17 | void res_counter_init(struct res_counter *counter, struct res_counter *parent) |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 18 | { |
| 19 | spin_lock_init(&counter->lock); |
Daisuke Nishimura | c5b947b | 2009-06-17 16:27:20 -0700 | [diff] [blame] | 20 | counter->limit = RESOURCE_MAX; |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 21 | counter->soft_limit = RESOURCE_MAX; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 22 | counter->parent = parent; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 23 | } |
| 24 | |
| 25 | int res_counter_charge_locked(struct res_counter *counter, unsigned long val) |
| 26 | { |
| 27 | if (counter->usage + val > counter->limit) { |
| 28 | counter->failcnt++; |
| 29 | return -ENOMEM; |
| 30 | } |
| 31 | |
| 32 | counter->usage += val; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 33 | if (counter->usage > counter->max_usage) |
| 34 | counter->max_usage = counter->usage; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 35 | return 0; |
| 36 | } |
| 37 | |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 38 | int res_counter_charge(struct res_counter *counter, unsigned long val, |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 39 | struct res_counter **limit_fail_at) |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 40 | { |
| 41 | int ret; |
| 42 | unsigned long flags; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 43 | struct res_counter *c, *u; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 44 | |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 45 | *limit_fail_at = NULL; |
| 46 | local_irq_save(flags); |
| 47 | for (c = counter; c != NULL; c = c->parent) { |
| 48 | spin_lock(&c->lock); |
| 49 | ret = res_counter_charge_locked(c, val); |
| 50 | spin_unlock(&c->lock); |
| 51 | if (ret < 0) { |
| 52 | *limit_fail_at = c; |
| 53 | goto undo; |
| 54 | } |
| 55 | } |
| 56 | ret = 0; |
| 57 | goto done; |
| 58 | undo: |
| 59 | for (u = counter; u != c; u = u->parent) { |
| 60 | spin_lock(&u->lock); |
| 61 | res_counter_uncharge_locked(u, val); |
| 62 | spin_unlock(&u->lock); |
| 63 | } |
| 64 | done: |
| 65 | local_irq_restore(flags); |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 66 | return ret; |
| 67 | } |
| 68 | |
| 69 | void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val) |
| 70 | { |
| 71 | if (WARN_ON(counter->usage < val)) |
| 72 | val = counter->usage; |
| 73 | |
| 74 | counter->usage -= val; |
| 75 | } |
| 76 | |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 77 | void res_counter_uncharge(struct res_counter *counter, unsigned long val) |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 78 | { |
| 79 | unsigned long flags; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 80 | struct res_counter *c; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 81 | |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 82 | local_irq_save(flags); |
| 83 | for (c = counter; c != NULL; c = c->parent) { |
| 84 | spin_lock(&c->lock); |
| 85 | res_counter_uncharge_locked(c, val); |
| 86 | spin_unlock(&c->lock); |
| 87 | } |
| 88 | local_irq_restore(flags); |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 92 | static inline unsigned long long * |
| 93 | res_counter_member(struct res_counter *counter, int member) |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 94 | { |
| 95 | switch (member) { |
| 96 | case RES_USAGE: |
| 97 | return &counter->usage; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 98 | case RES_MAX_USAGE: |
| 99 | return &counter->max_usage; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 100 | case RES_LIMIT: |
| 101 | return &counter->limit; |
| 102 | case RES_FAILCNT: |
| 103 | return &counter->failcnt; |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 104 | case RES_SOFT_LIMIT: |
| 105 | return &counter->soft_limit; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 106 | }; |
| 107 | |
| 108 | BUG(); |
| 109 | return NULL; |
| 110 | } |
| 111 | |
| 112 | ssize_t res_counter_read(struct res_counter *counter, int member, |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 113 | const char __user *userbuf, size_t nbytes, loff_t *pos, |
| 114 | int (*read_strategy)(unsigned long long val, char *st_buf)) |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 115 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 116 | unsigned long long *val; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 117 | char buf[64], *s; |
| 118 | |
| 119 | s = buf; |
| 120 | val = res_counter_member(counter, member); |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 121 | if (read_strategy) |
| 122 | s += read_strategy(*val, s); |
| 123 | else |
| 124 | s += sprintf(s, "%llu\n", *val); |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 125 | return simple_read_from_buffer((void __user *)userbuf, nbytes, |
| 126 | pos, buf, s - buf); |
| 127 | } |
| 128 | |
KAMEZAWA Hiroyuki | 6c191cd | 2011-03-23 16:42:18 -0700 | [diff] [blame] | 129 | #if BITS_PER_LONG == 32 |
| 130 | u64 res_counter_read_u64(struct res_counter *counter, int member) |
| 131 | { |
| 132 | unsigned long flags; |
| 133 | u64 ret; |
| 134 | |
| 135 | spin_lock_irqsave(&counter->lock, flags); |
| 136 | ret = *res_counter_member(counter, member); |
| 137 | spin_unlock_irqrestore(&counter->lock, flags); |
| 138 | |
| 139 | return ret; |
| 140 | } |
| 141 | #else |
Paul Menage | 2c7eabf | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 142 | u64 res_counter_read_u64(struct res_counter *counter, int member) |
| 143 | { |
| 144 | return *res_counter_member(counter, member); |
| 145 | } |
KAMEZAWA Hiroyuki | 6c191cd | 2011-03-23 16:42:18 -0700 | [diff] [blame] | 146 | #endif |
Paul Menage | 2c7eabf | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 147 | |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 148 | int res_counter_memparse_write_strategy(const char *buf, |
| 149 | unsigned long long *res) |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 150 | { |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 151 | char *end; |
Daisuke Nishimura | c5b947b | 2009-06-17 16:27:20 -0700 | [diff] [blame] | 152 | |
| 153 | /* return RESOURCE_MAX(unlimited) if "-1" is specified */ |
| 154 | if (*buf == '-') { |
| 155 | *res = simple_strtoull(buf + 1, &end, 10); |
| 156 | if (*res != 1 || *end != '\0') |
| 157 | return -EINVAL; |
| 158 | *res = RESOURCE_MAX; |
| 159 | return 0; |
| 160 | } |
| 161 | |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 162 | /* FIXME - make memparse() take const char* args */ |
| 163 | *res = memparse((char *)buf, &end); |
| 164 | if (*end != '\0') |
| 165 | return -EINVAL; |
| 166 | |
| 167 | *res = PAGE_ALIGN(*res); |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | int res_counter_write(struct res_counter *counter, int member, |
| 172 | const char *buf, write_strategy_fn write_strategy) |
| 173 | { |
| 174 | char *end; |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 175 | unsigned long flags; |
| 176 | unsigned long long tmp, *val; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 177 | |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 178 | if (write_strategy) { |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 179 | if (write_strategy(buf, &tmp)) |
| 180 | return -EINVAL; |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 181 | } else { |
| 182 | tmp = simple_strtoull(buf, &end, 10); |
| 183 | if (*end != '\0') |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 184 | return -EINVAL; |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 185 | } |
| 186 | spin_lock_irqsave(&counter->lock, flags); |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 187 | val = res_counter_member(counter, member); |
| 188 | *val = tmp; |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 189 | spin_unlock_irqrestore(&counter->lock, flags); |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 190 | return 0; |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 191 | } |