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> |
Jay Lan | 9acc185 | 2006-09-30 23:28:58 -0700 | [diff] [blame] | 23 | #include <linux/tsacct_kern.h> |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 24 | #include <linux/cpumask.h> |
| 25 | #include <linux/percpu.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 26 | #include <net/genetlink.h> |
| 27 | #include <asm/atomic.h> |
| 28 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 29 | /* |
| 30 | * Maximum length of a cpumask that can be specified in |
| 31 | * the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute |
| 32 | */ |
| 33 | #define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS) |
| 34 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 35 | static DEFINE_PER_CPU(__u32, taskstats_seqnum) = { 0 }; |
| 36 | static int family_registered; |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 37 | struct kmem_cache *taskstats_cache; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 38 | |
| 39 | static struct genl_family family = { |
| 40 | .id = GENL_ID_GENERATE, |
| 41 | .name = TASKSTATS_GENL_NAME, |
| 42 | .version = TASKSTATS_GENL_VERSION, |
| 43 | .maxattr = TASKSTATS_CMD_ATTR_MAX, |
| 44 | }; |
| 45 | |
| 46 | static struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] |
| 47 | __read_mostly = { |
| 48 | [TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, |
| 49 | [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 50 | [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, |
| 51 | [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; |
| 52 | |
| 53 | struct listener { |
| 54 | struct list_head list; |
| 55 | pid_t pid; |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 56 | char valid; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 57 | }; |
| 58 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 59 | struct listener_list { |
| 60 | struct rw_semaphore sem; |
| 61 | struct list_head list; |
| 62 | }; |
| 63 | static DEFINE_PER_CPU(struct listener_list, listener_array); |
| 64 | |
| 65 | enum actions { |
| 66 | REGISTER, |
| 67 | DEREGISTER, |
| 68 | CPU_DONT_CARE |
| 69 | }; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 70 | |
| 71 | static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, |
| 72 | void **replyp, size_t size) |
| 73 | { |
| 74 | struct sk_buff *skb; |
| 75 | void *reply; |
| 76 | |
| 77 | /* |
| 78 | * If new attributes are added, please revisit this allocation |
| 79 | */ |
Thomas Graf | 3dabc71 | 2006-11-14 19:44:52 -0800 | [diff] [blame] | 80 | skb = genlmsg_new(size, GFP_KERNEL); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 81 | if (!skb) |
| 82 | return -ENOMEM; |
| 83 | |
| 84 | if (!info) { |
| 85 | int seq = get_cpu_var(taskstats_seqnum)++; |
| 86 | put_cpu_var(taskstats_seqnum); |
| 87 | |
Thomas Graf | 17c157c | 2006-11-14 19:46:02 -0800 | [diff] [blame] | 88 | reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 89 | } else |
Thomas Graf | 17c157c | 2006-11-14 19:46:02 -0800 | [diff] [blame] | 90 | reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 91 | if (reply == NULL) { |
| 92 | nlmsg_free(skb); |
| 93 | return -EINVAL; |
| 94 | } |
| 95 | |
| 96 | *skbp = skb; |
| 97 | *replyp = reply; |
| 98 | return 0; |
| 99 | } |
| 100 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 101 | /* |
| 102 | * Send taskstats data in @skb to listener with nl_pid @pid |
| 103 | */ |
| 104 | static int send_reply(struct sk_buff *skb, pid_t pid) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 105 | { |
| 106 | struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 107 | void *reply = genlmsg_data(genlhdr); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 108 | int rc; |
| 109 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 110 | rc = genlmsg_end(skb, reply); |
| 111 | if (rc < 0) { |
| 112 | nlmsg_free(skb); |
| 113 | return rc; |
| 114 | } |
| 115 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 116 | return genlmsg_unicast(skb, pid); |
| 117 | } |
| 118 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 119 | /* |
| 120 | * Send taskstats data in @skb to listeners registered for @cpu's exit data |
| 121 | */ |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 122 | static void send_cpu_listeners(struct sk_buff *skb, |
| 123 | struct listener_list *listeners) |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 124 | { |
| 125 | struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 126 | struct listener *s, *tmp; |
| 127 | struct sk_buff *skb_next, *skb_cur = skb; |
| 128 | void *reply = genlmsg_data(genlhdr); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 129 | int rc, delcount = 0; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 130 | |
| 131 | rc = genlmsg_end(skb, reply); |
| 132 | if (rc < 0) { |
| 133 | nlmsg_free(skb); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 134 | return; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | rc = 0; |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 138 | down_read(&listeners->sem); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 139 | list_for_each_entry(s, &listeners->list, list) { |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 140 | skb_next = NULL; |
| 141 | if (!list_is_last(&s->list, &listeners->list)) { |
| 142 | skb_next = skb_clone(skb_cur, GFP_KERNEL); |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 143 | if (!skb_next) |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 144 | break; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 145 | } |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 146 | rc = genlmsg_unicast(skb_cur, s->pid); |
| 147 | if (rc == -ECONNREFUSED) { |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 148 | s->valid = 0; |
| 149 | delcount++; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 150 | } |
| 151 | skb_cur = skb_next; |
| 152 | } |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 153 | up_read(&listeners->sem); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 154 | |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 155 | if (skb_cur) |
| 156 | nlmsg_free(skb_cur); |
| 157 | |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 158 | if (!delcount) |
Shailabh Nagar | d94a041 | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 159 | return; |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 160 | |
| 161 | /* Delete invalidated entries */ |
| 162 | down_write(&listeners->sem); |
| 163 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
| 164 | if (!s->valid) { |
| 165 | list_del(&s->list); |
| 166 | kfree(s); |
| 167 | } |
| 168 | } |
| 169 | up_write(&listeners->sem); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 172 | static int fill_pid(pid_t pid, struct task_struct *tsk, |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 173 | struct taskstats *stats) |
| 174 | { |
Shailabh Nagar | 7d94ddd | 2006-07-30 03:03:10 -0700 | [diff] [blame] | 175 | int rc = 0; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 176 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 177 | if (!tsk) { |
| 178 | rcu_read_lock(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 179 | tsk = find_task_by_pid(pid); |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 180 | if (tsk) |
| 181 | get_task_struct(tsk); |
| 182 | rcu_read_unlock(); |
| 183 | if (!tsk) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 184 | return -ESRCH; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 185 | } else |
| 186 | get_task_struct(tsk); |
| 187 | |
| 188 | /* |
| 189 | * Each accounting subsystem adds calls to its functions to |
| 190 | * fill in relevant parts of struct taskstsats as follows |
| 191 | * |
Shailabh Nagar | 7d94ddd | 2006-07-30 03:03:10 -0700 | [diff] [blame] | 192 | * per-task-foo(stats, tsk); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 193 | */ |
| 194 | |
Shailabh Nagar | 7d94ddd | 2006-07-30 03:03:10 -0700 | [diff] [blame] | 195 | delayacct_add_tsk(stats, tsk); |
Jay Lan | f3cef7a | 2006-09-30 23:28:55 -0700 | [diff] [blame] | 196 | |
| 197 | /* fill in basic acct fields */ |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 198 | stats->version = TASKSTATS_VERSION; |
Jay Lan | f3cef7a | 2006-09-30 23:28:55 -0700 | [diff] [blame] | 199 | bacct_add_tsk(stats, tsk); |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 200 | |
Jay Lan | 9acc185 | 2006-09-30 23:28:58 -0700 | [diff] [blame] | 201 | /* fill in extended acct fields */ |
| 202 | xacct_add_tsk(stats, tsk); |
| 203 | |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 204 | /* Define err: label here if needed */ |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 205 | put_task_struct(tsk); |
| 206 | return rc; |
| 207 | |
| 208 | } |
| 209 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 210 | static int fill_tgid(pid_t tgid, struct task_struct *first, |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 211 | struct taskstats *stats) |
| 212 | { |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 213 | struct task_struct *tsk; |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 214 | unsigned long flags; |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 215 | int rc = -ESRCH; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 216 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 217 | /* |
| 218 | * Add additional stats from live tasks except zombie thread group |
| 219 | * leaders who are already counted with the dead tasks |
| 220 | */ |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 221 | rcu_read_lock(); |
| 222 | if (!first) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 223 | first = find_task_by_pid(tgid); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 224 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 225 | if (!first || !lock_task_sighand(first, &flags)) |
| 226 | goto out; |
| 227 | |
| 228 | if (first->signal->stats) |
| 229 | memcpy(stats, first->signal->stats, sizeof(*stats)); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 230 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 231 | tsk = first; |
| 232 | do { |
Oleg Nesterov | d7c3f5f | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 233 | if (tsk->exit_state) |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 234 | continue; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 235 | /* |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 236 | * Accounting subsystem can call its functions here to |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 237 | * fill in relevant parts of struct taskstsats as follows |
| 238 | * |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 239 | * per-task-foo(stats, tsk); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 240 | */ |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 241 | delayacct_add_tsk(stats, tsk); |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 242 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 243 | } while_each_thread(first, tsk); |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 244 | |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 245 | unlock_task_sighand(first, &flags); |
| 246 | rc = 0; |
| 247 | out: |
| 248 | rcu_read_unlock(); |
| 249 | |
| 250 | stats->version = TASKSTATS_VERSION; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 251 | /* |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 252 | * Accounting subsytems can also add calls here to modify |
| 253 | * fields of taskstats. |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 254 | */ |
Oleg Nesterov | a98b609 | 2006-10-28 10:38:54 -0700 | [diff] [blame] | 255 | return rc; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 258 | |
| 259 | static void fill_tgid_exit(struct task_struct *tsk) |
| 260 | { |
| 261 | unsigned long flags; |
| 262 | |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 263 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 264 | if (!tsk->signal->stats) |
| 265 | goto ret; |
| 266 | |
| 267 | /* |
| 268 | * Each accounting subsystem calls its functions here to |
| 269 | * accumalate its per-task stats for tsk, into the per-tgid structure |
| 270 | * |
| 271 | * per-task-foo(tsk->signal->stats, tsk); |
| 272 | */ |
| 273 | delayacct_add_tsk(tsk->signal->stats, tsk); |
| 274 | ret: |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 275 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 276 | return; |
| 277 | } |
| 278 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 279 | static int add_del_listener(pid_t pid, cpumask_t *maskp, int isadd) |
| 280 | { |
| 281 | struct listener_list *listeners; |
| 282 | struct listener *s, *tmp; |
| 283 | unsigned int cpu; |
| 284 | cpumask_t mask = *maskp; |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 285 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 286 | if (!cpus_subset(mask, cpu_possible_map)) |
| 287 | return -EINVAL; |
| 288 | |
| 289 | if (isadd == REGISTER) { |
| 290 | for_each_cpu_mask(cpu, mask) { |
| 291 | s = kmalloc_node(sizeof(struct listener), GFP_KERNEL, |
| 292 | cpu_to_node(cpu)); |
| 293 | if (!s) |
| 294 | goto cleanup; |
| 295 | s->pid = pid; |
| 296 | INIT_LIST_HEAD(&s->list); |
Shailabh Nagar | bb12999 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 297 | s->valid = 1; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 298 | |
| 299 | listeners = &per_cpu(listener_array, cpu); |
| 300 | down_write(&listeners->sem); |
| 301 | list_add(&s->list, &listeners->list); |
| 302 | up_write(&listeners->sem); |
| 303 | } |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | /* Deregister or cleanup */ |
| 308 | cleanup: |
| 309 | for_each_cpu_mask(cpu, mask) { |
| 310 | listeners = &per_cpu(listener_array, cpu); |
| 311 | down_write(&listeners->sem); |
| 312 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
| 313 | if (s->pid == pid) { |
| 314 | list_del(&s->list); |
| 315 | kfree(s); |
| 316 | break; |
| 317 | } |
| 318 | } |
| 319 | up_write(&listeners->sem); |
| 320 | } |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int parse(struct nlattr *na, cpumask_t *mask) |
| 325 | { |
| 326 | char *data; |
| 327 | int len; |
| 328 | int ret; |
| 329 | |
| 330 | if (na == NULL) |
| 331 | return 1; |
| 332 | len = nla_len(na); |
| 333 | if (len > TASKSTATS_CPUMASK_MAXLEN) |
| 334 | return -E2BIG; |
| 335 | if (len < 1) |
| 336 | return -EINVAL; |
| 337 | data = kmalloc(len, GFP_KERNEL); |
| 338 | if (!data) |
| 339 | return -ENOMEM; |
| 340 | nla_strlcpy(data, na, len); |
| 341 | ret = cpulist_parse(data, *mask); |
| 342 | kfree(data); |
| 343 | return ret; |
| 344 | } |
| 345 | |
| 346 | 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] | 347 | { |
| 348 | int rc = 0; |
| 349 | struct sk_buff *rep_skb; |
| 350 | struct taskstats stats; |
| 351 | void *reply; |
| 352 | size_t size; |
| 353 | struct nlattr *na; |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 354 | cpumask_t mask; |
| 355 | |
| 356 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], &mask); |
| 357 | if (rc < 0) |
| 358 | return rc; |
| 359 | if (rc == 0) |
| 360 | return add_del_listener(info->snd_pid, &mask, REGISTER); |
| 361 | |
| 362 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], &mask); |
| 363 | if (rc < 0) |
| 364 | return rc; |
| 365 | if (rc == 0) |
| 366 | return add_del_listener(info->snd_pid, &mask, DEREGISTER); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 367 | |
| 368 | /* |
| 369 | * Size includes space for nested attributes |
| 370 | */ |
| 371 | size = nla_total_size(sizeof(u32)) + |
| 372 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
| 373 | |
| 374 | memset(&stats, 0, sizeof(stats)); |
| 375 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, &reply, size); |
| 376 | if (rc < 0) |
| 377 | return rc; |
| 378 | |
| 379 | if (info->attrs[TASKSTATS_CMD_ATTR_PID]) { |
| 380 | u32 pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); |
| 381 | rc = fill_pid(pid, NULL, &stats); |
| 382 | if (rc < 0) |
| 383 | goto err; |
| 384 | |
| 385 | na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID); |
| 386 | NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, pid); |
| 387 | NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, |
| 388 | stats); |
| 389 | } else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) { |
| 390 | u32 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); |
| 391 | rc = fill_tgid(tgid, NULL, &stats); |
| 392 | if (rc < 0) |
| 393 | goto err; |
| 394 | |
| 395 | na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID); |
| 396 | NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, tgid); |
| 397 | NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, |
| 398 | stats); |
| 399 | } else { |
| 400 | rc = -EINVAL; |
| 401 | goto err; |
| 402 | } |
| 403 | |
| 404 | nla_nest_end(rep_skb, na); |
| 405 | |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 406 | return send_reply(rep_skb, info->snd_pid); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 407 | |
| 408 | nla_put_failure: |
Oleg Nesterov | d46a3d0 | 2006-10-29 16:45:58 +0300 | [diff] [blame] | 409 | rc = genlmsg_cancel(rep_skb, reply); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 410 | err: |
| 411 | nlmsg_free(rep_skb); |
| 412 | return rc; |
| 413 | } |
| 414 | |
| 415 | /* Send pid data out on exit */ |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 416 | void taskstats_exit(struct task_struct *tsk, int group_dead) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 417 | { |
| 418 | int rc; |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 419 | struct listener_list *listeners; |
| 420 | struct taskstats *tidstats; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 421 | struct sk_buff *rep_skb; |
| 422 | void *reply; |
| 423 | size_t size; |
| 424 | int is_thread_group; |
| 425 | struct nlattr *na; |
| 426 | |
Oleg Nesterov | 4a279ff | 2006-10-30 22:07:15 -0800 | [diff] [blame] | 427 | if (!family_registered) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 428 | return; |
| 429 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 430 | /* |
| 431 | * Size includes space for nested attributes |
| 432 | */ |
| 433 | size = nla_total_size(sizeof(u32)) + |
| 434 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
| 435 | |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 436 | is_thread_group = (tsk->signal->stats != NULL); |
Oleg Nesterov | 4a279ff | 2006-10-30 22:07:15 -0800 | [diff] [blame] | 437 | if (is_thread_group) { |
| 438 | /* PID + STATS + TGID + STATS */ |
| 439 | size = 2 * size; |
| 440 | /* fill the tsk->signal->stats structure */ |
| 441 | fill_tgid_exit(tsk); |
| 442 | } |
| 443 | |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 444 | listeners = &__raw_get_cpu_var(listener_array); |
| 445 | if (list_empty(&listeners->list)) |
| 446 | return; |
| 447 | |
| 448 | tidstats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); |
Oleg Nesterov | 4a279ff | 2006-10-30 22:07:15 -0800 | [diff] [blame] | 449 | if (!tidstats) |
| 450 | return; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 451 | |
| 452 | rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, &reply, size); |
| 453 | if (rc < 0) |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 454 | goto free_stats; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 455 | |
| 456 | rc = fill_pid(tsk->pid, tsk, tidstats); |
| 457 | if (rc < 0) |
| 458 | goto err_skb; |
| 459 | |
| 460 | na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_PID); |
| 461 | NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_PID, (u32)tsk->pid); |
| 462 | NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, |
| 463 | *tidstats); |
| 464 | nla_nest_end(rep_skb, na); |
| 465 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 466 | if (!is_thread_group) |
| 467 | goto send; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 468 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 469 | /* |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 470 | * 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] | 471 | */ |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 472 | if (!group_dead) |
| 473 | goto send; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 474 | |
| 475 | na = nla_nest_start(rep_skb, TASKSTATS_TYPE_AGGR_TGID); |
| 476 | NLA_PUT_U32(rep_skb, TASKSTATS_TYPE_TGID, (u32)tsk->tgid); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 477 | /* No locking needed for tsk->signal->stats since group is dead */ |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 478 | NLA_PUT_TYPE(rep_skb, struct taskstats, TASKSTATS_TYPE_STATS, |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 479 | *tsk->signal->stats); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 480 | nla_nest_end(rep_skb, na); |
| 481 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 482 | send: |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 483 | send_cpu_listeners(rep_skb, listeners); |
| 484 | free_stats: |
| 485 | kmem_cache_free(taskstats_cache, tidstats); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 486 | return; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 487 | |
| 488 | nla_put_failure: |
| 489 | genlmsg_cancel(rep_skb, reply); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 490 | err_skb: |
| 491 | nlmsg_free(rep_skb); |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 492 | goto free_stats; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | static struct genl_ops taskstats_ops = { |
| 496 | .cmd = TASKSTATS_CMD_GET, |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 497 | .doit = taskstats_user_cmd, |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 498 | .policy = taskstats_cmd_get_policy, |
| 499 | }; |
| 500 | |
| 501 | /* Needed early in initialization */ |
| 502 | void __init taskstats_init_early(void) |
| 503 | { |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 504 | unsigned int i; |
| 505 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 506 | taskstats_cache = kmem_cache_create("taskstats_cache", |
| 507 | sizeof(struct taskstats), |
| 508 | 0, SLAB_PANIC, NULL, NULL); |
Shailabh Nagar | f9fd891 | 2006-07-14 00:24:47 -0700 | [diff] [blame] | 509 | for_each_possible_cpu(i) { |
| 510 | INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); |
| 511 | init_rwsem(&(per_cpu(listener_array, i).sem)); |
| 512 | } |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 513 | } |
| 514 | |
| 515 | static int __init taskstats_init(void) |
| 516 | { |
| 517 | int rc; |
| 518 | |
| 519 | rc = genl_register_family(&family); |
| 520 | if (rc) |
| 521 | return rc; |
| 522 | |
| 523 | rc = genl_register_ops(&family, &taskstats_ops); |
| 524 | if (rc < 0) |
| 525 | goto err; |
| 526 | |
| 527 | family_registered = 1; |
| 528 | return 0; |
| 529 | err: |
| 530 | genl_unregister_family(&family); |
| 531 | return rc; |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * late initcall ensures initialization of statistics collection |
| 536 | * mechanisms precedes initialization of the taskstats interface |
| 537 | */ |
| 538 | late_initcall(taskstats_init); |