Commit | Line | Data |
---|---|---|
c757249a SN |
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> | |
f3cef7a9 | 21 | #include <linux/tsacct_kern.h> |
6f44993f | 22 | #include <linux/delayacct.h> |
f9fd8914 SN |
23 | #include <linux/cpumask.h> |
24 | #include <linux/percpu.h> | |
846c7bb0 BS |
25 | #include <linux/cgroupstats.h> |
26 | #include <linux/cgroup.h> | |
27 | #include <linux/fs.h> | |
28 | #include <linux/file.h> | |
c757249a SN |
29 | #include <net/genetlink.h> |
30 | #include <asm/atomic.h> | |
31 | ||
f9fd8914 SN |
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 | ||
b81f3ea9 | 38 | static DEFINE_PER_CPU(__u32, taskstats_seqnum); |
c757249a | 39 | static int family_registered; |
e18b890b | 40 | struct kmem_cache *taskstats_cache; |
c757249a SN |
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 | ||
b54452b0 | 49 | static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = { |
c757249a SN |
50 | [TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, |
51 | [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, | |
f9fd8914 SN |
52 | [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, |
53 | [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; | |
54 | ||
b54452b0 | 55 | static const struct nla_policy cgroupstats_cmd_get_policy[CGROUPSTATS_CMD_ATTR_MAX+1] = { |
846c7bb0 BS |
56 | [CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, |
57 | }; | |
58 | ||
f9fd8914 SN |
59 | struct listener { |
60 | struct list_head list; | |
61 | pid_t pid; | |
bb129994 | 62 | char valid; |
c757249a SN |
63 | }; |
64 | ||
f9fd8914 SN |
65 | struct listener_list { |
66 | struct rw_semaphore sem; | |
67 | struct list_head list; | |
68 | }; | |
69 | static DEFINE_PER_CPU(struct listener_list, listener_array); | |
70 | ||
71 | enum actions { | |
72 | REGISTER, | |
73 | DEREGISTER, | |
74 | CPU_DONT_CARE | |
75 | }; | |
c757249a SN |
76 | |
77 | static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, | |
37167485 | 78 | size_t size) |
c757249a SN |
79 | { |
80 | struct sk_buff *skb; | |
81 | void *reply; | |
82 | ||
83 | /* | |
84 | * If new attributes are added, please revisit this allocation | |
85 | */ | |
3dabc715 | 86 | skb = genlmsg_new(size, GFP_KERNEL); |
c757249a SN |
87 | if (!skb) |
88 | return -ENOMEM; | |
89 | ||
90 | if (!info) { | |
91 | int seq = get_cpu_var(taskstats_seqnum)++; | |
92 | put_cpu_var(taskstats_seqnum); | |
93 | ||
17c157c8 | 94 | reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
c757249a | 95 | } else |
17c157c8 | 96 | reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
c757249a SN |
97 | if (reply == NULL) { |
98 | nlmsg_free(skb); | |
99 | return -EINVAL; | |
100 | } | |
101 | ||
102 | *skbp = skb; | |
c757249a SN |
103 | return 0; |
104 | } | |
105 | ||
f9fd8914 SN |
106 | /* |
107 | * Send taskstats data in @skb to listener with nl_pid @pid | |
108 | */ | |
134e6375 | 109 | static int send_reply(struct sk_buff *skb, struct genl_info *info) |
c757249a | 110 | { |
b529ccf2 | 111 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
f9fd8914 | 112 | void *reply = genlmsg_data(genlhdr); |
c757249a SN |
113 | int rc; |
114 | ||
c757249a SN |
115 | rc = genlmsg_end(skb, reply); |
116 | if (rc < 0) { | |
117 | nlmsg_free(skb); | |
118 | return rc; | |
119 | } | |
120 | ||
134e6375 | 121 | return genlmsg_reply(skb, info); |
c757249a SN |
122 | } |
123 | ||
f9fd8914 SN |
124 | /* |
125 | * Send taskstats data in @skb to listeners registered for @cpu's exit data | |
126 | */ | |
115085ea ON |
127 | static void send_cpu_listeners(struct sk_buff *skb, |
128 | struct listener_list *listeners) | |
f9fd8914 | 129 | { |
b529ccf2 | 130 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
f9fd8914 SN |
131 | struct listener *s, *tmp; |
132 | struct sk_buff *skb_next, *skb_cur = skb; | |
133 | void *reply = genlmsg_data(genlhdr); | |
d94a0415 | 134 | int rc, delcount = 0; |
f9fd8914 SN |
135 | |
136 | rc = genlmsg_end(skb, reply); | |
137 | if (rc < 0) { | |
138 | nlmsg_free(skb); | |
d94a0415 | 139 | return; |
f9fd8914 SN |
140 | } |
141 | ||
142 | rc = 0; | |
bb129994 | 143 | down_read(&listeners->sem); |
d94a0415 | 144 | list_for_each_entry(s, &listeners->list, list) { |
f9fd8914 SN |
145 | skb_next = NULL; |
146 | if (!list_is_last(&s->list, &listeners->list)) { | |
147 | skb_next = skb_clone(skb_cur, GFP_KERNEL); | |
d94a0415 | 148 | if (!skb_next) |
f9fd8914 | 149 | break; |
f9fd8914 | 150 | } |
134e6375 | 151 | rc = genlmsg_unicast(&init_net, skb_cur, s->pid); |
d94a0415 | 152 | if (rc == -ECONNREFUSED) { |
bb129994 SN |
153 | s->valid = 0; |
154 | delcount++; | |
f9fd8914 SN |
155 | } |
156 | skb_cur = skb_next; | |
157 | } | |
bb129994 | 158 | up_read(&listeners->sem); |
f9fd8914 | 159 | |
d94a0415 SN |
160 | if (skb_cur) |
161 | nlmsg_free(skb_cur); | |
162 | ||
bb129994 | 163 | if (!delcount) |
d94a0415 | 164 | return; |
bb129994 SN |
165 | |
166 | /* Delete invalidated entries */ | |
167 | down_write(&listeners->sem); | |
168 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { | |
169 | if (!s->valid) { | |
170 | list_del(&s->list); | |
171 | kfree(s); | |
172 | } | |
173 | } | |
174 | up_write(&listeners->sem); | |
f9fd8914 SN |
175 | } |
176 | ||
a98b6094 | 177 | static int fill_pid(pid_t pid, struct task_struct *tsk, |
c757249a SN |
178 | struct taskstats *stats) |
179 | { | |
7d94dddd | 180 | int rc = 0; |
c757249a | 181 | |
a98b6094 ON |
182 | if (!tsk) { |
183 | rcu_read_lock(); | |
cb41d6d0 | 184 | tsk = find_task_by_vpid(pid); |
a98b6094 ON |
185 | if (tsk) |
186 | get_task_struct(tsk); | |
187 | rcu_read_unlock(); | |
188 | if (!tsk) | |
c757249a | 189 | return -ESRCH; |
c757249a SN |
190 | } else |
191 | get_task_struct(tsk); | |
192 | ||
51de4d90 | 193 | memset(stats, 0, sizeof(*stats)); |
c757249a SN |
194 | /* |
195 | * Each accounting subsystem adds calls to its functions to | |
196 | * fill in relevant parts of struct taskstsats as follows | |
197 | * | |
7d94dddd | 198 | * per-task-foo(stats, tsk); |
c757249a SN |
199 | */ |
200 | ||
7d94dddd | 201 | delayacct_add_tsk(stats, tsk); |
f3cef7a9 JL |
202 | |
203 | /* fill in basic acct fields */ | |
6f44993f | 204 | stats->version = TASKSTATS_VERSION; |
b663a79c MU |
205 | stats->nvcsw = tsk->nvcsw; |
206 | stats->nivcsw = tsk->nivcsw; | |
f3cef7a9 | 207 | bacct_add_tsk(stats, tsk); |
6f44993f | 208 | |
9acc1853 JL |
209 | /* fill in extended acct fields */ |
210 | xacct_add_tsk(stats, tsk); | |
211 | ||
6f44993f | 212 | /* Define err: label here if needed */ |
c757249a SN |
213 | put_task_struct(tsk); |
214 | return rc; | |
215 | ||
216 | } | |
217 | ||
a98b6094 | 218 | static int fill_tgid(pid_t tgid, struct task_struct *first, |
c757249a SN |
219 | struct taskstats *stats) |
220 | { | |
a98b6094 | 221 | struct task_struct *tsk; |
ad4ecbcb | 222 | unsigned long flags; |
a98b6094 | 223 | int rc = -ESRCH; |
c757249a | 224 | |
ad4ecbcb SN |
225 | /* |
226 | * Add additional stats from live tasks except zombie thread group | |
227 | * leaders who are already counted with the dead tasks | |
228 | */ | |
a98b6094 ON |
229 | rcu_read_lock(); |
230 | if (!first) | |
cb41d6d0 | 231 | first = find_task_by_vpid(tgid); |
ad4ecbcb | 232 | |
a98b6094 ON |
233 | if (!first || !lock_task_sighand(first, &flags)) |
234 | goto out; | |
ad4ecbcb | 235 | |
a98b6094 ON |
236 | if (first->signal->stats) |
237 | memcpy(stats, first->signal->stats, sizeof(*stats)); | |
51de4d90 ON |
238 | else |
239 | memset(stats, 0, sizeof(*stats)); | |
fca178c0 | 240 | |
a98b6094 | 241 | tsk = first; |
c757249a | 242 | do { |
d7c3f5f2 | 243 | if (tsk->exit_state) |
ad4ecbcb | 244 | continue; |
c757249a | 245 | /* |
ad4ecbcb | 246 | * Accounting subsystem can call its functions here to |
c757249a SN |
247 | * fill in relevant parts of struct taskstsats as follows |
248 | * | |
ad4ecbcb | 249 | * per-task-foo(stats, tsk); |
c757249a | 250 | */ |
ad4ecbcb | 251 | delayacct_add_tsk(stats, tsk); |
6f44993f | 252 | |
b663a79c MU |
253 | stats->nvcsw += tsk->nvcsw; |
254 | stats->nivcsw += tsk->nivcsw; | |
c757249a | 255 | } while_each_thread(first, tsk); |
6f44993f | 256 | |
a98b6094 ON |
257 | unlock_task_sighand(first, &flags); |
258 | rc = 0; | |
259 | out: | |
260 | rcu_read_unlock(); | |
261 | ||
262 | stats->version = TASKSTATS_VERSION; | |
c757249a | 263 | /* |
3a4fa0a2 | 264 | * Accounting subsystems can also add calls here to modify |
ad4ecbcb | 265 | * fields of taskstats. |
c757249a | 266 | */ |
a98b6094 | 267 | return rc; |
ad4ecbcb SN |
268 | } |
269 | ||
270 | ||
271 | static void fill_tgid_exit(struct task_struct *tsk) | |
272 | { | |
273 | unsigned long flags; | |
274 | ||
b8534d7b | 275 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
ad4ecbcb SN |
276 | if (!tsk->signal->stats) |
277 | goto ret; | |
278 | ||
279 | /* | |
280 | * Each accounting subsystem calls its functions here to | |
281 | * accumalate its per-task stats for tsk, into the per-tgid structure | |
282 | * | |
283 | * per-task-foo(tsk->signal->stats, tsk); | |
284 | */ | |
285 | delayacct_add_tsk(tsk->signal->stats, tsk); | |
286 | ret: | |
b8534d7b | 287 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
ad4ecbcb | 288 | return; |
c757249a SN |
289 | } |
290 | ||
41c7bb95 | 291 | static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd) |
f9fd8914 SN |
292 | { |
293 | struct listener_list *listeners; | |
294 | struct listener *s, *tmp; | |
295 | unsigned int cpu; | |
ad4ecbcb | 296 | |
41c7bb95 | 297 | if (!cpumask_subset(mask, cpu_possible_mask)) |
f9fd8914 SN |
298 | return -EINVAL; |
299 | ||
300 | if (isadd == REGISTER) { | |
41c7bb95 | 301 | for_each_cpu(cpu, mask) { |
f9fd8914 SN |
302 | s = kmalloc_node(sizeof(struct listener), GFP_KERNEL, |
303 | cpu_to_node(cpu)); | |
304 | if (!s) | |
305 | goto cleanup; | |
306 | s->pid = pid; | |
307 | INIT_LIST_HEAD(&s->list); | |
bb129994 | 308 | s->valid = 1; |
f9fd8914 SN |
309 | |
310 | listeners = &per_cpu(listener_array, cpu); | |
311 | down_write(&listeners->sem); | |
312 | list_add(&s->list, &listeners->list); | |
313 | up_write(&listeners->sem); | |
314 | } | |
315 | return 0; | |
316 | } | |
317 | ||
318 | /* Deregister or cleanup */ | |
319 | cleanup: | |
41c7bb95 | 320 | for_each_cpu(cpu, mask) { |
f9fd8914 SN |
321 | listeners = &per_cpu(listener_array, cpu); |
322 | down_write(&listeners->sem); | |
323 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { | |
324 | if (s->pid == pid) { | |
325 | list_del(&s->list); | |
326 | kfree(s); | |
327 | break; | |
328 | } | |
329 | } | |
330 | up_write(&listeners->sem); | |
331 | } | |
332 | return 0; | |
333 | } | |
334 | ||
41c7bb95 | 335 | static int parse(struct nlattr *na, struct cpumask *mask) |
f9fd8914 SN |
336 | { |
337 | char *data; | |
338 | int len; | |
339 | int ret; | |
340 | ||
341 | if (na == NULL) | |
342 | return 1; | |
343 | len = nla_len(na); | |
344 | if (len > TASKSTATS_CPUMASK_MAXLEN) | |
345 | return -E2BIG; | |
346 | if (len < 1) | |
347 | return -EINVAL; | |
348 | data = kmalloc(len, GFP_KERNEL); | |
349 | if (!data) | |
350 | return -ENOMEM; | |
351 | nla_strlcpy(data, na, len); | |
29c0177e | 352 | ret = cpulist_parse(data, mask); |
f9fd8914 SN |
353 | kfree(data); |
354 | return ret; | |
355 | } | |
356 | ||
51de4d90 | 357 | static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid) |
68062b86 | 358 | { |
51de4d90 | 359 | struct nlattr *na, *ret; |
68062b86 ON |
360 | int aggr; |
361 | ||
37167485 ON |
362 | aggr = (type == TASKSTATS_TYPE_PID) |
363 | ? TASKSTATS_TYPE_AGGR_PID | |
364 | : TASKSTATS_TYPE_AGGR_TGID; | |
68062b86 ON |
365 | |
366 | na = nla_nest_start(skb, aggr); | |
37167485 ON |
367 | if (!na) |
368 | goto err; | |
51de4d90 ON |
369 | if (nla_put(skb, type, sizeof(pid), &pid) < 0) |
370 | goto err; | |
371 | ret = nla_reserve(skb, TASKSTATS_TYPE_STATS, sizeof(struct taskstats)); | |
372 | if (!ret) | |
373 | goto err; | |
68062b86 ON |
374 | nla_nest_end(skb, na); |
375 | ||
51de4d90 ON |
376 | return nla_data(ret); |
377 | err: | |
378 | return NULL; | |
68062b86 ON |
379 | } |
380 | ||
846c7bb0 BS |
381 | static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
382 | { | |
383 | int rc = 0; | |
384 | struct sk_buff *rep_skb; | |
385 | struct cgroupstats *stats; | |
386 | struct nlattr *na; | |
387 | size_t size; | |
388 | u32 fd; | |
389 | struct file *file; | |
390 | int fput_needed; | |
391 | ||
392 | na = info->attrs[CGROUPSTATS_CMD_ATTR_FD]; | |
393 | if (!na) | |
394 | return -EINVAL; | |
395 | ||
396 | fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]); | |
397 | file = fget_light(fd, &fput_needed); | |
f9615984 AB |
398 | if (!file) |
399 | return 0; | |
846c7bb0 | 400 | |
f9615984 | 401 | size = nla_total_size(sizeof(struct cgroupstats)); |
846c7bb0 | 402 | |
f9615984 AB |
403 | rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb, |
404 | size); | |
405 | if (rc < 0) | |
406 | goto err; | |
846c7bb0 | 407 | |
f9615984 AB |
408 | na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS, |
409 | sizeof(struct cgroupstats)); | |
410 | stats = nla_data(na); | |
411 | memset(stats, 0, sizeof(*stats)); | |
846c7bb0 | 412 | |
f9615984 AB |
413 | rc = cgroupstats_build(stats, file->f_dentry); |
414 | if (rc < 0) { | |
415 | nlmsg_free(rep_skb); | |
416 | goto err; | |
846c7bb0 BS |
417 | } |
418 | ||
134e6375 | 419 | rc = send_reply(rep_skb, info); |
f9615984 | 420 | |
846c7bb0 | 421 | err: |
f9615984 | 422 | fput_light(file, fput_needed); |
846c7bb0 BS |
423 | return rc; |
424 | } | |
425 | ||
f9fd8914 | 426 | static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
c757249a | 427 | { |
41c7bb95 | 428 | int rc; |
c757249a | 429 | struct sk_buff *rep_skb; |
51de4d90 | 430 | struct taskstats *stats; |
c757249a | 431 | size_t size; |
41c7bb95 RR |
432 | cpumask_var_t mask; |
433 | ||
434 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
435 | return -ENOMEM; | |
f9fd8914 | 436 | |
41c7bb95 | 437 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask); |
f9fd8914 | 438 | if (rc < 0) |
41c7bb95 RR |
439 | goto free_return_rc; |
440 | if (rc == 0) { | |
441 | rc = add_del_listener(info->snd_pid, mask, REGISTER); | |
442 | goto free_return_rc; | |
443 | } | |
f9fd8914 | 444 | |
41c7bb95 | 445 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask); |
f9fd8914 | 446 | if (rc < 0) |
41c7bb95 RR |
447 | goto free_return_rc; |
448 | if (rc == 0) { | |
449 | rc = add_del_listener(info->snd_pid, mask, DEREGISTER); | |
450 | free_return_rc: | |
451 | free_cpumask_var(mask); | |
f9fd8914 | 452 | return rc; |
41c7bb95 RR |
453 | } |
454 | free_cpumask_var(mask); | |
c757249a SN |
455 | |
456 | /* | |
457 | * Size includes space for nested attributes | |
458 | */ | |
459 | size = nla_total_size(sizeof(u32)) + | |
460 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); | |
461 | ||
37167485 | 462 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
c757249a SN |
463 | if (rc < 0) |
464 | return rc; | |
465 | ||
51de4d90 | 466 | rc = -EINVAL; |
c757249a SN |
467 | if (info->attrs[TASKSTATS_CMD_ATTR_PID]) { |
468 | u32 pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); | |
51de4d90 ON |
469 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid); |
470 | if (!stats) | |
37167485 | 471 | goto err; |
c757249a | 472 | |
51de4d90 ON |
473 | rc = fill_pid(pid, NULL, stats); |
474 | if (rc < 0) | |
37167485 | 475 | goto err; |
c757249a SN |
476 | } else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) { |
477 | u32 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); | |
51de4d90 ON |
478 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid); |
479 | if (!stats) | |
37167485 | 480 | goto err; |
c757249a | 481 | |
51de4d90 ON |
482 | rc = fill_tgid(tgid, NULL, stats); |
483 | if (rc < 0) | |
37167485 | 484 | goto err; |
51de4d90 | 485 | } else |
c757249a | 486 | goto err; |
c757249a | 487 | |
134e6375 | 488 | return send_reply(rep_skb, info); |
c757249a SN |
489 | err: |
490 | nlmsg_free(rep_skb); | |
491 | return rc; | |
492 | } | |
493 | ||
34ec1234 ON |
494 | static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk) |
495 | { | |
496 | struct signal_struct *sig = tsk->signal; | |
497 | struct taskstats *stats; | |
498 | ||
499 | if (sig->stats || thread_group_empty(tsk)) | |
500 | goto ret; | |
501 | ||
502 | /* No problem if kmem_cache_zalloc() fails */ | |
503 | stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); | |
504 | ||
505 | spin_lock_irq(&tsk->sighand->siglock); | |
506 | if (!sig->stats) { | |
507 | sig->stats = stats; | |
508 | stats = NULL; | |
509 | } | |
510 | spin_unlock_irq(&tsk->sighand->siglock); | |
511 | ||
512 | if (stats) | |
513 | kmem_cache_free(taskstats_cache, stats); | |
514 | ret: | |
515 | return sig->stats; | |
516 | } | |
517 | ||
c757249a | 518 | /* Send pid data out on exit */ |
115085ea | 519 | void taskstats_exit(struct task_struct *tsk, int group_dead) |
c757249a SN |
520 | { |
521 | int rc; | |
115085ea | 522 | struct listener_list *listeners; |
51de4d90 | 523 | struct taskstats *stats; |
c757249a | 524 | struct sk_buff *rep_skb; |
c757249a SN |
525 | size_t size; |
526 | int is_thread_group; | |
c757249a | 527 | |
4a279ff1 | 528 | if (!family_registered) |
c757249a SN |
529 | return; |
530 | ||
c757249a SN |
531 | /* |
532 | * Size includes space for nested attributes | |
533 | */ | |
534 | size = nla_total_size(sizeof(u32)) + | |
535 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); | |
536 | ||
34ec1234 | 537 | is_thread_group = !!taskstats_tgid_alloc(tsk); |
4a279ff1 ON |
538 | if (is_thread_group) { |
539 | /* PID + STATS + TGID + STATS */ | |
540 | size = 2 * size; | |
541 | /* fill the tsk->signal->stats structure */ | |
542 | fill_tgid_exit(tsk); | |
543 | } | |
544 | ||
115085ea ON |
545 | listeners = &__raw_get_cpu_var(listener_array); |
546 | if (list_empty(&listeners->list)) | |
547 | return; | |
548 | ||
37167485 | 549 | rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size); |
c757249a | 550 | if (rc < 0) |
51de4d90 | 551 | return; |
c757249a | 552 | |
51de4d90 ON |
553 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, tsk->pid); |
554 | if (!stats) | |
37167485 | 555 | goto err; |
c757249a | 556 | |
cb41d6d0 | 557 | rc = fill_pid(-1, tsk, stats); |
51de4d90 | 558 | if (rc < 0) |
37167485 | 559 | goto err; |
c757249a | 560 | |
c757249a | 561 | /* |
ad4ecbcb | 562 | * Doesn't matter if tsk is the leader or the last group member leaving |
c757249a | 563 | */ |
68062b86 | 564 | if (!is_thread_group || !group_dead) |
ad4ecbcb | 565 | goto send; |
c757249a | 566 | |
51de4d90 ON |
567 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tsk->tgid); |
568 | if (!stats) | |
37167485 | 569 | goto err; |
51de4d90 ON |
570 | |
571 | memcpy(stats, tsk->signal->stats, sizeof(*stats)); | |
c757249a | 572 | |
ad4ecbcb | 573 | send: |
115085ea | 574 | send_cpu_listeners(rep_skb, listeners); |
ad4ecbcb | 575 | return; |
37167485 | 576 | err: |
c757249a | 577 | nlmsg_free(rep_skb); |
c757249a SN |
578 | } |
579 | ||
580 | static struct genl_ops taskstats_ops = { | |
581 | .cmd = TASKSTATS_CMD_GET, | |
f9fd8914 | 582 | .doit = taskstats_user_cmd, |
c757249a SN |
583 | .policy = taskstats_cmd_get_policy, |
584 | }; | |
585 | ||
846c7bb0 BS |
586 | static struct genl_ops cgroupstats_ops = { |
587 | .cmd = CGROUPSTATS_CMD_GET, | |
588 | .doit = cgroupstats_user_cmd, | |
589 | .policy = cgroupstats_cmd_get_policy, | |
590 | }; | |
591 | ||
c757249a SN |
592 | /* Needed early in initialization */ |
593 | void __init taskstats_init_early(void) | |
594 | { | |
f9fd8914 SN |
595 | unsigned int i; |
596 | ||
0a31bd5f | 597 | taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC); |
f9fd8914 SN |
598 | for_each_possible_cpu(i) { |
599 | INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); | |
600 | init_rwsem(&(per_cpu(listener_array, i).sem)); | |
601 | } | |
c757249a SN |
602 | } |
603 | ||
604 | static int __init taskstats_init(void) | |
605 | { | |
606 | int rc; | |
607 | ||
608 | rc = genl_register_family(&family); | |
609 | if (rc) | |
610 | return rc; | |
611 | ||
612 | rc = genl_register_ops(&family, &taskstats_ops); | |
613 | if (rc < 0) | |
614 | goto err; | |
615 | ||
846c7bb0 BS |
616 | rc = genl_register_ops(&family, &cgroupstats_ops); |
617 | if (rc < 0) | |
618 | goto err_cgroup_ops; | |
619 | ||
c757249a | 620 | family_registered = 1; |
846c7bb0 | 621 | printk("registered taskstats version %d\n", TASKSTATS_GENL_VERSION); |
c757249a | 622 | return 0; |
846c7bb0 BS |
623 | err_cgroup_ops: |
624 | genl_unregister_ops(&family, &taskstats_ops); | |
c757249a SN |
625 | err: |
626 | genl_unregister_family(&family); | |
627 | return rc; | |
628 | } | |
629 | ||
630 | /* | |
631 | * late initcall ensures initialization of statistics collection | |
632 | * mechanisms precedes initialization of the taskstats interface | |
633 | */ | |
634 | late_initcall(taskstats_init); |