Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * taskstats.c - Export per-task statistics to userland |
| 3 | * |
| 4 | * Copyright (C) Shailabh Nagar, IBM Corp. 2006 |
| 5 | * (C) Balbir Singh, IBM Corp. 2006 |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/taskstats_kern.h> |
Jay Lan | f3cef7a | 2006-09-30 23:28:55 -0700 | [diff] [blame] | 21 | #include <linux/tsacct_kern.h> |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 22 | #include <linux/delayacct.h> |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 23 | #include <linux/cpumask.h> |
| 24 | #include <linux/percpu.h> |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 25 | #include <linux/cgroupstats.h> |
| 26 | #include <linux/cgroup.h> |
| 27 | #include <linux/fs.h> |
| 28 | #include <linux/file.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 29 | #include <net/genetlink.h> |
| 30 | #include <asm/atomic.h> |
| 31 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 32 | /* |
| 33 | * Maximum length of a cpumask that can be specified in |
| 34 | * the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute |
| 35 | */ |
| 36 | #define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS) |
| 37 | |
Vegard Nossum | b81f3ea | 2008-07-25 01:48:55 -0700 | [diff] [blame] | 38 | static DEFINE_PER_CPU(__u32, taskstats_seqnum); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 39 | static int family_registered; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 40 | struct kmem_cache *taskstats_cache; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 41 | |
| 42 | static struct genl_family family = { |
| 43 | .id = GENL_ID_GENERATE, |
| 44 | .name = TASKSTATS_GENL_NAME, |
| 45 | .version = TASKSTATS_GENL_VERSION, |
| 46 | .maxattr = TASKSTATS_CMD_ATTR_MAX, |
| 47 | }; |
| 48 | |
| 49 | static struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] |
| 50 | __read_mostly = { |
| 51 | [TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, |
| 52 | [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 53 | [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, |
| 54 | [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; |
| 55 | |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 56 | static struct nla_policy |
| 57 | cgroupstats_cmd_get_policy[CGROUPSTATS_CMD_ATTR_MAX+1] __read_mostly = { |
| 58 | [CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, |
| 59 | }; |
| 60 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 61 | struct listener { |
| 62 | struct list_head list; |
| 63 | pid_t pid; |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 64 | char valid; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 65 | }; |
| 66 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 67 | struct listener_list { |
| 68 | struct rw_semaphore sem; |
| 69 | struct list_head list; |
| 70 | }; |
| 71 | static DEFINE_PER_CPU(struct listener_list, listener_array); |
| 72 | |
| 73 | enum actions { |
| 74 | REGISTER, |
| 75 | DEREGISTER, |
| 76 | CPU_DONT_CARE |
| 77 | }; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 78 | |
| 79 | static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 80 | size_t size) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 81 | { |
| 82 | struct sk_buff *skb; |
| 83 | void *reply; |
| 84 | |
| 85 | /* |
| 86 | * If new attributes are added, please revisit this allocation |
| 87 | */ |
Thomas Graf | 3dabc71 | 2006-11-14 19:44:52 -0800 | [diff] [blame] | 88 | skb = genlmsg_new(size, GFP_KERNEL); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 89 | if (!skb) |
| 90 | return -ENOMEM; |
| 91 | |
| 92 | if (!info) { |
| 93 | int seq = get_cpu_var(taskstats_seqnum)++; |
| 94 | put_cpu_var(taskstats_seqnum); |
| 95 | |
Thomas Graf | 17c157c | 2006-11-14 19:46:02 -0800 | [diff] [blame] | 96 | reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 97 | } else |
Thomas Graf | 17c157c | 2006-11-14 19:46:02 -0800 | [diff] [blame] | 98 | reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 99 | if (reply == NULL) { |
| 100 | nlmsg_free(skb); |
| 101 | return -EINVAL; |
| 102 | } |
| 103 | |
| 104 | *skbp = skb; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 105 | return 0; |
| 106 | } |
| 107 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 108 | /* |
| 109 | * Send taskstats data in @skb to listener with nl_pid @pid |
| 110 | */ |
| 111 | static int send_reply(struct sk_buff *skb, pid_t pid) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 112 | { |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 113 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 114 | void *reply = genlmsg_data(genlhdr); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 115 | int rc; |
| 116 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 117 | rc = genlmsg_end(skb, reply); |
| 118 | if (rc < 0) { |
| 119 | nlmsg_free(skb); |
| 120 | return rc; |
| 121 | } |
| 122 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 123 | return genlmsg_unicast(skb, pid); |
| 124 | } |
| 125 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 126 | /* |
| 127 | * Send taskstats data in @skb to listeners registered for @cpu's exit data |
| 128 | */ |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame] | 129 | static void send_cpu_listeners(struct sk_buff *skb, |
| 130 | struct listener_list *listeners) |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 131 | { |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 132 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 133 | struct listener *s, *tmp; |
| 134 | struct sk_buff *skb_next, *skb_cur = skb; |
| 135 | void *reply = genlmsg_data(genlhdr); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 136 | int rc, delcount = 0; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 137 | |
| 138 | rc = genlmsg_end(skb, reply); |
| 139 | if (rc < 0) { |
| 140 | nlmsg_free(skb); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 141 | return; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | rc = 0; |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 145 | down_read(&listeners->sem); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 146 | list_for_each_entry(s, &listeners->list, list) { |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 147 | skb_next = NULL; |
| 148 | if (!list_is_last(&s->list, &listeners->list)) { |
| 149 | skb_next = skb_clone(skb_cur, GFP_KERNEL); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 150 | if (!skb_next) |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 151 | break; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 152 | } |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 153 | rc = genlmsg_unicast(skb_cur, s->pid); |
| 154 | if (rc == -ECONNREFUSED) { |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 155 | s->valid = 0; |
| 156 | delcount++; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 157 | } |
| 158 | skb_cur = skb_next; |
| 159 | } |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 160 | up_read(&listeners->sem); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 161 | |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 162 | if (skb_cur) |
| 163 | nlmsg_free(skb_cur); |
| 164 | |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 165 | if (!delcount) |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 166 | return; |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 167 | |
| 168 | /* Delete invalidated entries */ |
| 169 | down_write(&listeners->sem); |
| 170 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
| 171 | if (!s->valid) { |
| 172 | list_del(&s->list); |
| 173 | kfree(s); |
| 174 | } |
| 175 | } |
| 176 | up_write(&listeners->sem); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 179 | static int fill_pid(pid_t pid, struct task_struct *tsk, |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 180 | struct taskstats *stats) |
| 181 | { |
Shailabh Nagar | 7d94ddd | 2006-07-30 03:03:10 -0700 | [diff] [blame] | 182 | int rc = 0; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 183 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 184 | if (!tsk) { |
| 185 | rcu_read_lock(); |
Pavel Emelyanov | cb41d6d | 2008-04-30 00:54:23 -0700 | [diff] [blame] | 186 | tsk = find_task_by_vpid(pid); |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 187 | if (tsk) |
| 188 | get_task_struct(tsk); |
| 189 | rcu_read_unlock(); |
| 190 | if (!tsk) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 191 | return -ESRCH; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 192 | } else |
| 193 | get_task_struct(tsk); |
| 194 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 195 | memset(stats, 0, sizeof(*stats)); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 196 | /* |
| 197 | * Each accounting subsystem adds calls to its functions to |
| 198 | * fill in relevant parts of struct taskstsats as follows |
| 199 | * |
Shailabh Nagar | 7d94ddd | 2006-07-30 03:03:10 -0700 | [diff] [blame] | 200 | * per-task-foo(stats, tsk); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 201 | */ |
| 202 | |
Shailabh Nagar | 7d94ddd | 2006-07-30 03:03:10 -0700 | [diff] [blame] | 203 | delayacct_add_tsk(stats, tsk); |
Jay Lan | f3cef7a | 2006-09-30 23:28:55 -0700 | [diff] [blame] | 204 | |
| 205 | /* fill in basic acct fields */ |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 206 | stats->version = TASKSTATS_VERSION; |
Maxim Uvarov | b663a79 | 2007-07-15 23:40:48 -0700 | [diff] [blame] | 207 | stats->nvcsw = tsk->nvcsw; |
| 208 | stats->nivcsw = tsk->nivcsw; |
Jay Lan | f3cef7a | 2006-09-30 23:28:55 -0700 | [diff] [blame] | 209 | bacct_add_tsk(stats, tsk); |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 210 | |
Jay Lan | 9acc185 | 2006-09-30 23:28:58 -0700 | [diff] [blame] | 211 | /* fill in extended acct fields */ |
| 212 | xacct_add_tsk(stats, tsk); |
| 213 | |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 214 | /* Define err: label here if needed */ |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 215 | put_task_struct(tsk); |
| 216 | return rc; |
| 217 | |
| 218 | } |
| 219 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 220 | static int fill_tgid(pid_t tgid, struct task_struct *first, |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 221 | struct taskstats *stats) |
| 222 | { |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 223 | struct task_struct *tsk; |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 224 | unsigned long flags; |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 225 | int rc = -ESRCH; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 226 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 227 | /* |
| 228 | * Add additional stats from live tasks except zombie thread group |
| 229 | * leaders who are already counted with the dead tasks |
| 230 | */ |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 231 | rcu_read_lock(); |
| 232 | if (!first) |
Pavel Emelyanov | cb41d6d | 2008-04-30 00:54:23 -0700 | [diff] [blame] | 233 | first = find_task_by_vpid(tgid); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 234 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 235 | if (!first || !lock_task_sighand(first, &flags)) |
| 236 | goto out; |
| 237 | |
| 238 | if (first->signal->stats) |
| 239 | memcpy(stats, first->signal->stats, sizeof(*stats)); |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 240 | else |
| 241 | memset(stats, 0, sizeof(*stats)); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 242 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 243 | tsk = first; |
| 244 | do { |
Oleg Nesterov | d7c3f5f | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 245 | if (tsk->exit_state) |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 246 | continue; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 247 | /* |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 248 | * Accounting subsystem can call its functions here to |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 249 | * fill in relevant parts of struct taskstsats as follows |
| 250 | * |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 251 | * per-task-foo(stats, tsk); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 252 | */ |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 253 | delayacct_add_tsk(stats, tsk); |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 254 | |
Maxim Uvarov | b663a79 | 2007-07-15 23:40:48 -0700 | [diff] [blame] | 255 | stats->nvcsw += tsk->nvcsw; |
| 256 | stats->nivcsw += tsk->nivcsw; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 257 | } while_each_thread(first, tsk); |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 258 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 259 | unlock_task_sighand(first, &flags); |
| 260 | rc = 0; |
| 261 | out: |
| 262 | rcu_read_unlock(); |
| 263 | |
| 264 | stats->version = TASKSTATS_VERSION; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 265 | /* |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 266 | * Accounting subsystems can also add calls here to modify |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 267 | * fields of taskstats. |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 268 | */ |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 269 | return rc; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 270 | } |
| 271 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 272 | |
| 273 | static void fill_tgid_exit(struct task_struct *tsk) |
| 274 | { |
| 275 | unsigned long flags; |
| 276 | |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 277 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 278 | if (!tsk->signal->stats) |
| 279 | goto ret; |
| 280 | |
| 281 | /* |
| 282 | * Each accounting subsystem calls its functions here to |
| 283 | * accumalate its per-task stats for tsk, into the per-tgid structure |
| 284 | * |
| 285 | * per-task-foo(tsk->signal->stats, tsk); |
| 286 | */ |
| 287 | delayacct_add_tsk(tsk->signal->stats, tsk); |
| 288 | ret: |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 289 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 290 | return; |
| 291 | } |
| 292 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 293 | static int add_del_listener(pid_t pid, cpumask_t *maskp, int isadd) |
| 294 | { |
| 295 | struct listener_list *listeners; |
| 296 | struct listener *s, *tmp; |
| 297 | unsigned int cpu; |
| 298 | cpumask_t mask = *maskp; |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 299 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 300 | if (!cpus_subset(mask, cpu_possible_map)) |
| 301 | return -EINVAL; |
| 302 | |
| 303 | if (isadd == REGISTER) { |
Mike Travis | 363ab6f | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 304 | for_each_cpu_mask_nr(cpu, mask) { |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 305 | s = kmalloc_node(sizeof(struct listener), GFP_KERNEL, |
| 306 | cpu_to_node(cpu)); |
| 307 | if (!s) |
| 308 | goto cleanup; |
| 309 | s->pid = pid; |
| 310 | INIT_LIST_HEAD(&s->list); |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 311 | s->valid = 1; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 312 | |
| 313 | listeners = &per_cpu(listener_array, cpu); |
| 314 | down_write(&listeners->sem); |
| 315 | list_add(&s->list, &listeners->list); |
| 316 | up_write(&listeners->sem); |
| 317 | } |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | /* Deregister or cleanup */ |
| 322 | cleanup: |
Mike Travis | 363ab6f | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 323 | for_each_cpu_mask_nr(cpu, mask) { |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 324 | listeners = &per_cpu(listener_array, cpu); |
| 325 | down_write(&listeners->sem); |
| 326 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
| 327 | if (s->pid == pid) { |
| 328 | list_del(&s->list); |
| 329 | kfree(s); |
| 330 | break; |
| 331 | } |
| 332 | } |
| 333 | up_write(&listeners->sem); |
| 334 | } |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | static int parse(struct nlattr *na, cpumask_t *mask) |
| 339 | { |
| 340 | char *data; |
| 341 | int len; |
| 342 | int ret; |
| 343 | |
| 344 | if (na == NULL) |
| 345 | return 1; |
| 346 | len = nla_len(na); |
| 347 | if (len > TASKSTATS_CPUMASK_MAXLEN) |
| 348 | return -E2BIG; |
| 349 | if (len < 1) |
| 350 | return -EINVAL; |
| 351 | data = kmalloc(len, GFP_KERNEL); |
| 352 | if (!data) |
| 353 | return -ENOMEM; |
| 354 | nla_strlcpy(data, na, len); |
Rusty Russell | 29c0177 | 2008-12-13 21:20:25 +1030 | [diff] [blame] | 355 | ret = cpulist_parse(data, mask); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 356 | kfree(data); |
| 357 | return ret; |
| 358 | } |
| 359 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 360 | static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid) |
Oleg Nesterov | 68062b8 | 2006-12-06 20:36:53 -0800 | [diff] [blame] | 361 | { |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 362 | struct nlattr *na, *ret; |
Oleg Nesterov | 68062b8 | 2006-12-06 20:36:53 -0800 | [diff] [blame] | 363 | int aggr; |
| 364 | |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 365 | aggr = (type == TASKSTATS_TYPE_PID) |
| 366 | ? TASKSTATS_TYPE_AGGR_PID |
| 367 | : TASKSTATS_TYPE_AGGR_TGID; |
Oleg Nesterov | 68062b8 | 2006-12-06 20:36:53 -0800 | [diff] [blame] | 368 | |
| 369 | na = nla_nest_start(skb, aggr); |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 370 | if (!na) |
| 371 | goto err; |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 372 | if (nla_put(skb, type, sizeof(pid), &pid) < 0) |
| 373 | goto err; |
| 374 | ret = nla_reserve(skb, TASKSTATS_TYPE_STATS, sizeof(struct taskstats)); |
| 375 | if (!ret) |
| 376 | goto err; |
Oleg Nesterov | 68062b8 | 2006-12-06 20:36:53 -0800 | [diff] [blame] | 377 | nla_nest_end(skb, na); |
| 378 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 379 | return nla_data(ret); |
| 380 | err: |
| 381 | return NULL; |
Oleg Nesterov | 68062b8 | 2006-12-06 20:36:53 -0800 | [diff] [blame] | 382 | } |
| 383 | |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 384 | static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
| 385 | { |
| 386 | int rc = 0; |
| 387 | struct sk_buff *rep_skb; |
| 388 | struct cgroupstats *stats; |
| 389 | struct nlattr *na; |
| 390 | size_t size; |
| 391 | u32 fd; |
| 392 | struct file *file; |
| 393 | int fput_needed; |
| 394 | |
| 395 | na = info->attrs[CGROUPSTATS_CMD_ATTR_FD]; |
| 396 | if (!na) |
| 397 | return -EINVAL; |
| 398 | |
| 399 | fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]); |
| 400 | file = fget_light(fd, &fput_needed); |
Adrian Bunk | f961598 | 2007-11-14 17:00:37 -0800 | [diff] [blame] | 401 | if (!file) |
| 402 | return 0; |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 403 | |
Adrian Bunk | f961598 | 2007-11-14 17:00:37 -0800 | [diff] [blame] | 404 | size = nla_total_size(sizeof(struct cgroupstats)); |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 405 | |
Adrian Bunk | f961598 | 2007-11-14 17:00:37 -0800 | [diff] [blame] | 406 | rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb, |
| 407 | size); |
| 408 | if (rc < 0) |
| 409 | goto err; |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 410 | |
Adrian Bunk | f961598 | 2007-11-14 17:00:37 -0800 | [diff] [blame] | 411 | na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS, |
| 412 | sizeof(struct cgroupstats)); |
| 413 | stats = nla_data(na); |
| 414 | memset(stats, 0, sizeof(*stats)); |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 415 | |
Adrian Bunk | f961598 | 2007-11-14 17:00:37 -0800 | [diff] [blame] | 416 | rc = cgroupstats_build(stats, file->f_dentry); |
| 417 | if (rc < 0) { |
| 418 | nlmsg_free(rep_skb); |
| 419 | goto err; |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 420 | } |
| 421 | |
Adrian Bunk | f961598 | 2007-11-14 17:00:37 -0800 | [diff] [blame] | 422 | rc = send_reply(rep_skb, info->snd_pid); |
| 423 | |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 424 | err: |
Adrian Bunk | f961598 | 2007-11-14 17:00:37 -0800 | [diff] [blame] | 425 | fput_light(file, fput_needed); |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 426 | return rc; |
| 427 | } |
| 428 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 429 | static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 430 | { |
| 431 | int rc = 0; |
| 432 | struct sk_buff *rep_skb; |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 433 | struct taskstats *stats; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 434 | size_t size; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 435 | cpumask_t mask; |
| 436 | |
| 437 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], &mask); |
| 438 | if (rc < 0) |
| 439 | return rc; |
| 440 | if (rc == 0) |
| 441 | return add_del_listener(info->snd_pid, &mask, REGISTER); |
| 442 | |
| 443 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], &mask); |
| 444 | if (rc < 0) |
| 445 | return rc; |
| 446 | if (rc == 0) |
| 447 | return add_del_listener(info->snd_pid, &mask, DEREGISTER); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 448 | |
| 449 | /* |
| 450 | * Size includes space for nested attributes |
| 451 | */ |
| 452 | size = nla_total_size(sizeof(u32)) + |
| 453 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
| 454 | |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 455 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 456 | if (rc < 0) |
| 457 | return rc; |
| 458 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 459 | rc = -EINVAL; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 460 | if (info->attrs[TASKSTATS_CMD_ATTR_PID]) { |
| 461 | u32 pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 462 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid); |
| 463 | if (!stats) |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 464 | goto err; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 465 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 466 | rc = fill_pid(pid, NULL, stats); |
| 467 | if (rc < 0) |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 468 | goto err; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 469 | } else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) { |
| 470 | u32 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 471 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid); |
| 472 | if (!stats) |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 473 | goto err; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 474 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 475 | rc = fill_tgid(tgid, NULL, stats); |
| 476 | if (rc < 0) |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 477 | goto err; |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 478 | } else |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 479 | goto err; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 480 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 481 | return send_reply(rep_skb, info->snd_pid); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 482 | err: |
| 483 | nlmsg_free(rep_skb); |
| 484 | return rc; |
| 485 | } |
| 486 | |
Oleg Nesterov | 34ec1234 | 2006-12-06 20:36:52 -0800 | [diff] [blame] | 487 | static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk) |
| 488 | { |
| 489 | struct signal_struct *sig = tsk->signal; |
| 490 | struct taskstats *stats; |
| 491 | |
| 492 | if (sig->stats || thread_group_empty(tsk)) |
| 493 | goto ret; |
| 494 | |
| 495 | /* No problem if kmem_cache_zalloc() fails */ |
| 496 | stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); |
| 497 | |
| 498 | spin_lock_irq(&tsk->sighand->siglock); |
| 499 | if (!sig->stats) { |
| 500 | sig->stats = stats; |
| 501 | stats = NULL; |
| 502 | } |
| 503 | spin_unlock_irq(&tsk->sighand->siglock); |
| 504 | |
| 505 | if (stats) |
| 506 | kmem_cache_free(taskstats_cache, stats); |
| 507 | ret: |
| 508 | return sig->stats; |
| 509 | } |
| 510 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 511 | /* Send pid data out on exit */ |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame] | 512 | void taskstats_exit(struct task_struct *tsk, int group_dead) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 513 | { |
| 514 | int rc; |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame] | 515 | struct listener_list *listeners; |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 516 | struct taskstats *stats; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 517 | struct sk_buff *rep_skb; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 518 | size_t size; |
| 519 | int is_thread_group; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 520 | |
Oleg Nesterov | 4a279ff | 2006-10-30 22:07:15 -0800 | [diff] [blame] | 521 | if (!family_registered) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 522 | return; |
| 523 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 524 | /* |
| 525 | * Size includes space for nested attributes |
| 526 | */ |
| 527 | size = nla_total_size(sizeof(u32)) + |
| 528 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
| 529 | |
Oleg Nesterov | 34ec1234 | 2006-12-06 20:36:52 -0800 | [diff] [blame] | 530 | is_thread_group = !!taskstats_tgid_alloc(tsk); |
Oleg Nesterov | 4a279ff | 2006-10-30 22:07:15 -0800 | [diff] [blame] | 531 | if (is_thread_group) { |
| 532 | /* PID + STATS + TGID + STATS */ |
| 533 | size = 2 * size; |
| 534 | /* fill the tsk->signal->stats structure */ |
| 535 | fill_tgid_exit(tsk); |
| 536 | } |
| 537 | |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame] | 538 | listeners = &__raw_get_cpu_var(listener_array); |
| 539 | if (list_empty(&listeners->list)) |
| 540 | return; |
| 541 | |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 542 | rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 543 | if (rc < 0) |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 544 | return; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 545 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 546 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, tsk->pid); |
| 547 | if (!stats) |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 548 | goto err; |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 549 | |
Pavel Emelyanov | cb41d6d | 2008-04-30 00:54:23 -0700 | [diff] [blame] | 550 | rc = fill_pid(-1, tsk, stats); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 551 | if (rc < 0) |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 552 | goto err; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 553 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 554 | /* |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 555 | * Doesn't matter if tsk is the leader or the last group member leaving |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 556 | */ |
Oleg Nesterov | 68062b8 | 2006-12-06 20:36:53 -0800 | [diff] [blame] | 557 | if (!is_thread_group || !group_dead) |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 558 | goto send; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 559 | |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 560 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tsk->tgid); |
| 561 | if (!stats) |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 562 | goto err; |
Oleg Nesterov | 51de4d9 | 2006-12-06 20:36:54 -0800 | [diff] [blame] | 563 | |
| 564 | memcpy(stats, tsk->signal->stats, sizeof(*stats)); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 565 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 566 | send: |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame] | 567 | send_cpu_listeners(rep_skb, listeners); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 568 | return; |
Oleg Nesterov | 37167485 | 2006-12-06 20:36:55 -0800 | [diff] [blame] | 569 | err: |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 570 | nlmsg_free(rep_skb); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | static struct genl_ops taskstats_ops = { |
| 574 | .cmd = TASKSTATS_CMD_GET, |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 575 | .doit = taskstats_user_cmd, |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 576 | .policy = taskstats_cmd_get_policy, |
| 577 | }; |
| 578 | |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 579 | static struct genl_ops cgroupstats_ops = { |
| 580 | .cmd = CGROUPSTATS_CMD_GET, |
| 581 | .doit = cgroupstats_user_cmd, |
| 582 | .policy = cgroupstats_cmd_get_policy, |
| 583 | }; |
| 584 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 585 | /* Needed early in initialization */ |
| 586 | void __init taskstats_init_early(void) |
| 587 | { |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 588 | unsigned int i; |
| 589 | |
Christoph Lameter | 0a31bd5 | 2007-05-06 14:49:57 -0700 | [diff] [blame] | 590 | taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 591 | for_each_possible_cpu(i) { |
| 592 | INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); |
| 593 | init_rwsem(&(per_cpu(listener_array, i).sem)); |
| 594 | } |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | static int __init taskstats_init(void) |
| 598 | { |
| 599 | int rc; |
| 600 | |
| 601 | rc = genl_register_family(&family); |
| 602 | if (rc) |
| 603 | return rc; |
| 604 | |
| 605 | rc = genl_register_ops(&family, &taskstats_ops); |
| 606 | if (rc < 0) |
| 607 | goto err; |
| 608 | |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 609 | rc = genl_register_ops(&family, &cgroupstats_ops); |
| 610 | if (rc < 0) |
| 611 | goto err_cgroup_ops; |
| 612 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 613 | family_registered = 1; |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 614 | printk("registered taskstats version %d\n", TASKSTATS_GENL_VERSION); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 615 | return 0; |
Balbir Singh | 846c7bb | 2007-10-18 23:39:44 -0700 | [diff] [blame] | 616 | err_cgroup_ops: |
| 617 | genl_unregister_ops(&family, &taskstats_ops); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 618 | err: |
| 619 | genl_unregister_family(&family); |
| 620 | return rc; |
| 621 | } |
| 622 | |
| 623 | /* |
| 624 | * late initcall ensures initialization of statistics collection |
| 625 | * mechanisms precedes initialization of the taskstats interface |
| 626 | */ |
| 627 | late_initcall(taskstats_init); |