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Commit | Line | Data |
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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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
846c7bb0 BS |
26 | #include <linux/cgroupstats.h> |
27 | #include <linux/cgroup.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/file.h> | |
4bd6e32a | 30 | #include <linux/pid_namespace.h> |
c757249a | 31 | #include <net/genetlink.h> |
60063497 | 32 | #include <linux/atomic.h> |
c757249a | 33 | |
f9fd8914 SN |
34 | /* |
35 | * Maximum length of a cpumask that can be specified in | |
36 | * the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute | |
37 | */ | |
38 | #define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS) | |
39 | ||
b81f3ea9 | 40 | static DEFINE_PER_CPU(__u32, taskstats_seqnum); |
c757249a | 41 | static int family_registered; |
e18b890b | 42 | struct kmem_cache *taskstats_cache; |
c757249a SN |
43 | |
44 | static struct genl_family family = { | |
45 | .id = GENL_ID_GENERATE, | |
46 | .name = TASKSTATS_GENL_NAME, | |
47 | .version = TASKSTATS_GENL_VERSION, | |
48 | .maxattr = TASKSTATS_CMD_ATTR_MAX, | |
49 | }; | |
50 | ||
b54452b0 | 51 | static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = { |
c757249a SN |
52 | [TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, |
53 | [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, | |
f9fd8914 SN |
54 | [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, |
55 | [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; | |
56 | ||
243d5212 WC |
57 | /* |
58 | * We have to use TASKSTATS_CMD_ATTR_MAX here, it is the maxattr in the family. | |
59 | * Make sure they are always aligned. | |
60 | */ | |
61 | static const struct nla_policy cgroupstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = { | |
846c7bb0 BS |
62 | [CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, |
63 | }; | |
64 | ||
f9fd8914 SN |
65 | struct listener { |
66 | struct list_head list; | |
67 | pid_t pid; | |
bb129994 | 68 | char valid; |
c757249a SN |
69 | }; |
70 | ||
f9fd8914 SN |
71 | struct listener_list { |
72 | struct rw_semaphore sem; | |
73 | struct list_head list; | |
74 | }; | |
75 | static DEFINE_PER_CPU(struct listener_list, listener_array); | |
76 | ||
77 | enum actions { | |
78 | REGISTER, | |
79 | DEREGISTER, | |
80 | CPU_DONT_CARE | |
81 | }; | |
c757249a SN |
82 | |
83 | static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, | |
37167485 | 84 | size_t size) |
c757249a SN |
85 | { |
86 | struct sk_buff *skb; | |
87 | void *reply; | |
88 | ||
89 | /* | |
90 | * If new attributes are added, please revisit this allocation | |
91 | */ | |
3dabc715 | 92 | skb = genlmsg_new(size, GFP_KERNEL); |
c757249a SN |
93 | if (!skb) |
94 | return -ENOMEM; | |
95 | ||
96 | if (!info) { | |
cd85fc58 | 97 | int seq = this_cpu_inc_return(taskstats_seqnum) - 1; |
c757249a | 98 | |
17c157c8 | 99 | reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
c757249a | 100 | } else |
17c157c8 | 101 | reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
c757249a SN |
102 | if (reply == NULL) { |
103 | nlmsg_free(skb); | |
104 | return -EINVAL; | |
105 | } | |
106 | ||
107 | *skbp = skb; | |
c757249a SN |
108 | return 0; |
109 | } | |
110 | ||
f9fd8914 SN |
111 | /* |
112 | * Send taskstats data in @skb to listener with nl_pid @pid | |
113 | */ | |
134e6375 | 114 | static int send_reply(struct sk_buff *skb, struct genl_info *info) |
c757249a | 115 | { |
b529ccf2 | 116 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
f9fd8914 | 117 | void *reply = genlmsg_data(genlhdr); |
c757249a | 118 | |
053c095a | 119 | genlmsg_end(skb, reply); |
c757249a | 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 | 135 | |
053c095a | 136 | genlmsg_end(skb, reply); |
f9fd8914 SN |
137 | |
138 | rc = 0; | |
bb129994 | 139 | down_read(&listeners->sem); |
d94a0415 | 140 | list_for_each_entry(s, &listeners->list, list) { |
f9fd8914 SN |
141 | skb_next = NULL; |
142 | if (!list_is_last(&s->list, &listeners->list)) { | |
143 | skb_next = skb_clone(skb_cur, GFP_KERNEL); | |
d94a0415 | 144 | if (!skb_next) |
f9fd8914 | 145 | break; |
f9fd8914 | 146 | } |
134e6375 | 147 | rc = genlmsg_unicast(&init_net, skb_cur, s->pid); |
d94a0415 | 148 | if (rc == -ECONNREFUSED) { |
bb129994 SN |
149 | s->valid = 0; |
150 | delcount++; | |
f9fd8914 SN |
151 | } |
152 | skb_cur = skb_next; | |
153 | } | |
bb129994 | 154 | up_read(&listeners->sem); |
f9fd8914 | 155 | |
d94a0415 SN |
156 | if (skb_cur) |
157 | nlmsg_free(skb_cur); | |
158 | ||
bb129994 | 159 | if (!delcount) |
d94a0415 | 160 | return; |
bb129994 SN |
161 | |
162 | /* Delete invalidated entries */ | |
163 | down_write(&listeners->sem); | |
164 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { | |
165 | if (!s->valid) { | |
166 | list_del(&s->list); | |
167 | kfree(s); | |
168 | } | |
169 | } | |
170 | up_write(&listeners->sem); | |
f9fd8914 SN |
171 | } |
172 | ||
4bd6e32a EB |
173 | static void fill_stats(struct user_namespace *user_ns, |
174 | struct pid_namespace *pid_ns, | |
175 | struct task_struct *tsk, struct taskstats *stats) | |
c757249a | 176 | { |
51de4d90 | 177 | memset(stats, 0, sizeof(*stats)); |
c757249a SN |
178 | /* |
179 | * Each accounting subsystem adds calls to its functions to | |
180 | * fill in relevant parts of struct taskstsats as follows | |
181 | * | |
7d94dddd | 182 | * per-task-foo(stats, tsk); |
c757249a SN |
183 | */ |
184 | ||
7d94dddd | 185 | delayacct_add_tsk(stats, tsk); |
f3cef7a9 JL |
186 | |
187 | /* fill in basic acct fields */ | |
6f44993f | 188 | stats->version = TASKSTATS_VERSION; |
b663a79c MU |
189 | stats->nvcsw = tsk->nvcsw; |
190 | stats->nivcsw = tsk->nivcsw; | |
4bd6e32a | 191 | bacct_add_tsk(user_ns, pid_ns, stats, tsk); |
6f44993f | 192 | |
9acc1853 JL |
193 | /* fill in extended acct fields */ |
194 | xacct_add_tsk(stats, tsk); | |
3d9e0cf1 | 195 | } |
9acc1853 | 196 | |
3d9e0cf1 MH |
197 | static int fill_stats_for_pid(pid_t pid, struct taskstats *stats) |
198 | { | |
199 | struct task_struct *tsk; | |
c757249a | 200 | |
3d9e0cf1 MH |
201 | rcu_read_lock(); |
202 | tsk = find_task_by_vpid(pid); | |
203 | if (tsk) | |
204 | get_task_struct(tsk); | |
205 | rcu_read_unlock(); | |
206 | if (!tsk) | |
207 | return -ESRCH; | |
4bd6e32a | 208 | fill_stats(current_user_ns(), task_active_pid_ns(current), tsk, stats); |
3d9e0cf1 MH |
209 | put_task_struct(tsk); |
210 | return 0; | |
c757249a SN |
211 | } |
212 | ||
3d9e0cf1 | 213 | static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) |
c757249a | 214 | { |
3d9e0cf1 | 215 | struct task_struct *tsk, *first; |
ad4ecbcb | 216 | unsigned long flags; |
a98b6094 | 217 | int rc = -ESRCH; |
c757249a | 218 | |
ad4ecbcb SN |
219 | /* |
220 | * Add additional stats from live tasks except zombie thread group | |
221 | * leaders who are already counted with the dead tasks | |
222 | */ | |
a98b6094 | 223 | rcu_read_lock(); |
3d9e0cf1 | 224 | first = find_task_by_vpid(tgid); |
ad4ecbcb | 225 | |
a98b6094 ON |
226 | if (!first || !lock_task_sighand(first, &flags)) |
227 | goto out; | |
ad4ecbcb | 228 | |
a98b6094 ON |
229 | if (first->signal->stats) |
230 | memcpy(stats, first->signal->stats, sizeof(*stats)); | |
51de4d90 ON |
231 | else |
232 | memset(stats, 0, sizeof(*stats)); | |
fca178c0 | 233 | |
a98b6094 | 234 | tsk = first; |
c757249a | 235 | do { |
d7c3f5f2 | 236 | if (tsk->exit_state) |
ad4ecbcb | 237 | continue; |
c757249a | 238 | /* |
ad4ecbcb | 239 | * Accounting subsystem can call its functions here to |
c757249a SN |
240 | * fill in relevant parts of struct taskstsats as follows |
241 | * | |
ad4ecbcb | 242 | * per-task-foo(stats, tsk); |
c757249a | 243 | */ |
ad4ecbcb | 244 | delayacct_add_tsk(stats, tsk); |
6f44993f | 245 | |
b663a79c MU |
246 | stats->nvcsw += tsk->nvcsw; |
247 | stats->nivcsw += tsk->nivcsw; | |
c757249a | 248 | } while_each_thread(first, tsk); |
6f44993f | 249 | |
a98b6094 ON |
250 | unlock_task_sighand(first, &flags); |
251 | rc = 0; | |
252 | out: | |
253 | rcu_read_unlock(); | |
254 | ||
255 | stats->version = TASKSTATS_VERSION; | |
c757249a | 256 | /* |
3a4fa0a2 | 257 | * Accounting subsystems can also add calls here to modify |
ad4ecbcb | 258 | * fields of taskstats. |
c757249a | 259 | */ |
a98b6094 | 260 | return rc; |
ad4ecbcb SN |
261 | } |
262 | ||
ad4ecbcb SN |
263 | static void fill_tgid_exit(struct task_struct *tsk) |
264 | { | |
265 | unsigned long flags; | |
266 | ||
b8534d7b | 267 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
ad4ecbcb SN |
268 | if (!tsk->signal->stats) |
269 | goto ret; | |
270 | ||
271 | /* | |
272 | * Each accounting subsystem calls its functions here to | |
273 | * accumalate its per-task stats for tsk, into the per-tgid structure | |
274 | * | |
275 | * per-task-foo(tsk->signal->stats, tsk); | |
276 | */ | |
277 | delayacct_add_tsk(tsk->signal->stats, tsk); | |
278 | ret: | |
b8534d7b | 279 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
ad4ecbcb | 280 | return; |
c757249a SN |
281 | } |
282 | ||
41c7bb95 | 283 | static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd) |
f9fd8914 SN |
284 | { |
285 | struct listener_list *listeners; | |
26c4caea | 286 | struct listener *s, *tmp, *s2; |
f9fd8914 | 287 | unsigned int cpu; |
0d20633b | 288 | int ret = 0; |
ad4ecbcb | 289 | |
41c7bb95 | 290 | if (!cpumask_subset(mask, cpu_possible_mask)) |
f9fd8914 SN |
291 | return -EINVAL; |
292 | ||
4bd6e32a EB |
293 | if (current_user_ns() != &init_user_ns) |
294 | return -EINVAL; | |
295 | ||
296 | if (task_active_pid_ns(current) != &init_pid_ns) | |
297 | return -EINVAL; | |
298 | ||
f9fd8914 | 299 | if (isadd == REGISTER) { |
41c7bb95 | 300 | for_each_cpu(cpu, mask) { |
dfc428b6 ON |
301 | s = kmalloc_node(sizeof(struct listener), |
302 | GFP_KERNEL, cpu_to_node(cpu)); | |
0d20633b CG |
303 | if (!s) { |
304 | ret = -ENOMEM; | |
f9fd8914 | 305 | goto cleanup; |
0d20633b | 306 | } |
f9fd8914 | 307 | s->pid = pid; |
bb129994 | 308 | s->valid = 1; |
f9fd8914 SN |
309 | |
310 | listeners = &per_cpu(listener_array, cpu); | |
311 | down_write(&listeners->sem); | |
dfc428b6 | 312 | list_for_each_entry(s2, &listeners->list, list) { |
a7295898 | 313 | if (s2->pid == pid && s2->valid) |
dfc428b6 | 314 | goto exists; |
26c4caea | 315 | } |
f9fd8914 | 316 | list_add(&s->list, &listeners->list); |
26c4caea | 317 | s = NULL; |
dfc428b6 | 318 | exists: |
f9fd8914 | 319 | up_write(&listeners->sem); |
dfc428b6 | 320 | kfree(s); /* nop if NULL */ |
f9fd8914 SN |
321 | } |
322 | return 0; | |
323 | } | |
324 | ||
325 | /* Deregister or cleanup */ | |
326 | cleanup: | |
41c7bb95 | 327 | for_each_cpu(cpu, mask) { |
f9fd8914 SN |
328 | listeners = &per_cpu(listener_array, cpu); |
329 | down_write(&listeners->sem); | |
330 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { | |
331 | if (s->pid == pid) { | |
332 | list_del(&s->list); | |
333 | kfree(s); | |
334 | break; | |
335 | } | |
336 | } | |
337 | up_write(&listeners->sem); | |
338 | } | |
0d20633b | 339 | return ret; |
f9fd8914 SN |
340 | } |
341 | ||
41c7bb95 | 342 | static int parse(struct nlattr *na, struct cpumask *mask) |
f9fd8914 SN |
343 | { |
344 | char *data; | |
345 | int len; | |
346 | int ret; | |
347 | ||
348 | if (na == NULL) | |
349 | return 1; | |
350 | len = nla_len(na); | |
351 | if (len > TASKSTATS_CPUMASK_MAXLEN) | |
352 | return -E2BIG; | |
353 | if (len < 1) | |
354 | return -EINVAL; | |
355 | data = kmalloc(len, GFP_KERNEL); | |
356 | if (!data) | |
357 | return -ENOMEM; | |
358 | nla_strlcpy(data, na, len); | |
29c0177e | 359 | ret = cpulist_parse(data, mask); |
f9fd8914 SN |
360 | kfree(data); |
361 | return ret; | |
362 | } | |
363 | ||
51de4d90 | 364 | static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid) |
68062b86 | 365 | { |
51de4d90 | 366 | struct nlattr *na, *ret; |
68062b86 ON |
367 | int aggr; |
368 | ||
37167485 ON |
369 | aggr = (type == TASKSTATS_TYPE_PID) |
370 | ? TASKSTATS_TYPE_AGGR_PID | |
371 | : TASKSTATS_TYPE_AGGR_TGID; | |
68062b86 ON |
372 | |
373 | na = nla_nest_start(skb, aggr); | |
37167485 ON |
374 | if (!na) |
375 | goto err; | |
4be2c95d | 376 | |
3fa58266 CG |
377 | if (nla_put(skb, type, sizeof(pid), &pid) < 0) { |
378 | nla_nest_cancel(skb, na); | |
51de4d90 | 379 | goto err; |
3fa58266 | 380 | } |
80df5542 ND |
381 | ret = nla_reserve_64bit(skb, TASKSTATS_TYPE_STATS, |
382 | sizeof(struct taskstats), TASKSTATS_TYPE_NULL); | |
3fa58266 CG |
383 | if (!ret) { |
384 | nla_nest_cancel(skb, na); | |
51de4d90 | 385 | goto err; |
3fa58266 | 386 | } |
68062b86 ON |
387 | nla_nest_end(skb, na); |
388 | ||
51de4d90 ON |
389 | return nla_data(ret); |
390 | err: | |
391 | return NULL; | |
68062b86 ON |
392 | } |
393 | ||
846c7bb0 BS |
394 | static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
395 | { | |
396 | int rc = 0; | |
397 | struct sk_buff *rep_skb; | |
398 | struct cgroupstats *stats; | |
399 | struct nlattr *na; | |
400 | size_t size; | |
401 | u32 fd; | |
2903ff01 | 402 | struct fd f; |
846c7bb0 BS |
403 | |
404 | na = info->attrs[CGROUPSTATS_CMD_ATTR_FD]; | |
405 | if (!na) | |
406 | return -EINVAL; | |
407 | ||
408 | fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]); | |
2903ff01 AV |
409 | f = fdget(fd); |
410 | if (!f.file) | |
f9615984 | 411 | return 0; |
846c7bb0 | 412 | |
f9615984 | 413 | size = nla_total_size(sizeof(struct cgroupstats)); |
846c7bb0 | 414 | |
f9615984 AB |
415 | rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb, |
416 | size); | |
417 | if (rc < 0) | |
418 | goto err; | |
846c7bb0 | 419 | |
f9615984 AB |
420 | na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS, |
421 | sizeof(struct cgroupstats)); | |
25353b33 | 422 | if (na == NULL) { |
0324b5a4 | 423 | nlmsg_free(rep_skb); |
25353b33 AC |
424 | rc = -EMSGSIZE; |
425 | goto err; | |
426 | } | |
427 | ||
f9615984 AB |
428 | stats = nla_data(na); |
429 | memset(stats, 0, sizeof(*stats)); | |
846c7bb0 | 430 | |
b583043e | 431 | rc = cgroupstats_build(stats, f.file->f_path.dentry); |
f9615984 AB |
432 | if (rc < 0) { |
433 | nlmsg_free(rep_skb); | |
434 | goto err; | |
846c7bb0 BS |
435 | } |
436 | ||
134e6375 | 437 | rc = send_reply(rep_skb, info); |
f9615984 | 438 | |
846c7bb0 | 439 | err: |
2903ff01 | 440 | fdput(f); |
846c7bb0 BS |
441 | return rc; |
442 | } | |
443 | ||
93233125 | 444 | static int cmd_attr_register_cpumask(struct genl_info *info) |
c757249a | 445 | { |
41c7bb95 | 446 | cpumask_var_t mask; |
93233125 | 447 | int rc; |
41c7bb95 RR |
448 | |
449 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
450 | return -ENOMEM; | |
41c7bb95 | 451 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask); |
f9fd8914 | 452 | if (rc < 0) |
93233125 | 453 | goto out; |
15e47304 | 454 | rc = add_del_listener(info->snd_portid, mask, REGISTER); |
93233125 MH |
455 | out: |
456 | free_cpumask_var(mask); | |
457 | return rc; | |
458 | } | |
459 | ||
460 | static int cmd_attr_deregister_cpumask(struct genl_info *info) | |
461 | { | |
462 | cpumask_var_t mask; | |
463 | int rc; | |
f9fd8914 | 464 | |
93233125 MH |
465 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
466 | return -ENOMEM; | |
41c7bb95 | 467 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask); |
f9fd8914 | 468 | if (rc < 0) |
93233125 | 469 | goto out; |
15e47304 | 470 | rc = add_del_listener(info->snd_portid, mask, DEREGISTER); |
93233125 | 471 | out: |
41c7bb95 | 472 | free_cpumask_var(mask); |
93233125 MH |
473 | return rc; |
474 | } | |
475 | ||
4be2c95d JM |
476 | static size_t taskstats_packet_size(void) |
477 | { | |
478 | size_t size; | |
479 | ||
480 | size = nla_total_size(sizeof(u32)) + | |
80df5542 ND |
481 | nla_total_size_64bit(sizeof(struct taskstats)) + |
482 | nla_total_size(0); | |
483 | ||
4be2c95d JM |
484 | return size; |
485 | } | |
486 | ||
93233125 MH |
487 | static int cmd_attr_pid(struct genl_info *info) |
488 | { | |
489 | struct taskstats *stats; | |
490 | struct sk_buff *rep_skb; | |
491 | size_t size; | |
492 | u32 pid; | |
493 | int rc; | |
c757249a | 494 | |
4be2c95d | 495 | size = taskstats_packet_size(); |
c757249a | 496 | |
37167485 | 497 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
c757249a SN |
498 | if (rc < 0) |
499 | return rc; | |
500 | ||
51de4d90 | 501 | rc = -EINVAL; |
93233125 MH |
502 | pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); |
503 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid); | |
504 | if (!stats) | |
c757249a | 505 | goto err; |
c757249a | 506 | |
3d9e0cf1 | 507 | rc = fill_stats_for_pid(pid, stats); |
93233125 MH |
508 | if (rc < 0) |
509 | goto err; | |
134e6375 | 510 | return send_reply(rep_skb, info); |
c757249a SN |
511 | err: |
512 | nlmsg_free(rep_skb); | |
513 | return rc; | |
514 | } | |
515 | ||
93233125 MH |
516 | static int cmd_attr_tgid(struct genl_info *info) |
517 | { | |
518 | struct taskstats *stats; | |
519 | struct sk_buff *rep_skb; | |
520 | size_t size; | |
521 | u32 tgid; | |
522 | int rc; | |
523 | ||
4be2c95d | 524 | size = taskstats_packet_size(); |
93233125 MH |
525 | |
526 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); | |
527 | if (rc < 0) | |
528 | return rc; | |
529 | ||
530 | rc = -EINVAL; | |
531 | tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); | |
532 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid); | |
533 | if (!stats) | |
534 | goto err; | |
535 | ||
3d9e0cf1 | 536 | rc = fill_stats_for_tgid(tgid, stats); |
93233125 MH |
537 | if (rc < 0) |
538 | goto err; | |
539 | return send_reply(rep_skb, info); | |
540 | err: | |
541 | nlmsg_free(rep_skb); | |
542 | return rc; | |
543 | } | |
544 | ||
545 | static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) | |
546 | { | |
547 | if (info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK]) | |
548 | return cmd_attr_register_cpumask(info); | |
549 | else if (info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK]) | |
550 | return cmd_attr_deregister_cpumask(info); | |
551 | else if (info->attrs[TASKSTATS_CMD_ATTR_PID]) | |
552 | return cmd_attr_pid(info); | |
553 | else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) | |
554 | return cmd_attr_tgid(info); | |
555 | else | |
556 | return -EINVAL; | |
557 | } | |
558 | ||
34ec1234 ON |
559 | static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk) |
560 | { | |
561 | struct signal_struct *sig = tsk->signal; | |
562 | struct taskstats *stats; | |
563 | ||
564 | if (sig->stats || thread_group_empty(tsk)) | |
565 | goto ret; | |
566 | ||
567 | /* No problem if kmem_cache_zalloc() fails */ | |
568 | stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); | |
569 | ||
570 | spin_lock_irq(&tsk->sighand->siglock); | |
571 | if (!sig->stats) { | |
572 | sig->stats = stats; | |
573 | stats = NULL; | |
574 | } | |
575 | spin_unlock_irq(&tsk->sighand->siglock); | |
576 | ||
577 | if (stats) | |
578 | kmem_cache_free(taskstats_cache, stats); | |
579 | ret: | |
580 | return sig->stats; | |
581 | } | |
582 | ||
c757249a | 583 | /* Send pid data out on exit */ |
115085ea | 584 | void taskstats_exit(struct task_struct *tsk, int group_dead) |
c757249a SN |
585 | { |
586 | int rc; | |
115085ea | 587 | struct listener_list *listeners; |
51de4d90 | 588 | struct taskstats *stats; |
c757249a | 589 | struct sk_buff *rep_skb; |
c757249a SN |
590 | size_t size; |
591 | int is_thread_group; | |
c757249a | 592 | |
4a279ff1 | 593 | if (!family_registered) |
c757249a SN |
594 | return; |
595 | ||
c757249a SN |
596 | /* |
597 | * Size includes space for nested attributes | |
598 | */ | |
4be2c95d | 599 | size = taskstats_packet_size(); |
c757249a | 600 | |
34ec1234 | 601 | is_thread_group = !!taskstats_tgid_alloc(tsk); |
4a279ff1 ON |
602 | if (is_thread_group) { |
603 | /* PID + STATS + TGID + STATS */ | |
604 | size = 2 * size; | |
605 | /* fill the tsk->signal->stats structure */ | |
606 | fill_tgid_exit(tsk); | |
607 | } | |
608 | ||
4a32fea9 | 609 | listeners = raw_cpu_ptr(&listener_array); |
115085ea ON |
610 | if (list_empty(&listeners->list)) |
611 | return; | |
612 | ||
37167485 | 613 | rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size); |
c757249a | 614 | if (rc < 0) |
51de4d90 | 615 | return; |
c757249a | 616 | |
4bd6e32a EB |
617 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, |
618 | task_pid_nr_ns(tsk, &init_pid_ns)); | |
51de4d90 | 619 | if (!stats) |
37167485 | 620 | goto err; |
c757249a | 621 | |
4bd6e32a | 622 | fill_stats(&init_user_ns, &init_pid_ns, tsk, stats); |
c757249a | 623 | |
c757249a | 624 | /* |
ad4ecbcb | 625 | * Doesn't matter if tsk is the leader or the last group member leaving |
c757249a | 626 | */ |
68062b86 | 627 | if (!is_thread_group || !group_dead) |
ad4ecbcb | 628 | goto send; |
c757249a | 629 | |
4bd6e32a EB |
630 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, |
631 | task_tgid_nr_ns(tsk, &init_pid_ns)); | |
51de4d90 | 632 | if (!stats) |
37167485 | 633 | goto err; |
51de4d90 ON |
634 | |
635 | memcpy(stats, tsk->signal->stats, sizeof(*stats)); | |
c757249a | 636 | |
ad4ecbcb | 637 | send: |
115085ea | 638 | send_cpu_listeners(rep_skb, listeners); |
ad4ecbcb | 639 | return; |
37167485 | 640 | err: |
c757249a | 641 | nlmsg_free(rep_skb); |
c757249a SN |
642 | } |
643 | ||
4534de83 | 644 | static const struct genl_ops taskstats_ops[] = { |
88d36a99 JB |
645 | { |
646 | .cmd = TASKSTATS_CMD_GET, | |
647 | .doit = taskstats_user_cmd, | |
648 | .policy = taskstats_cmd_get_policy, | |
649 | .flags = GENL_ADMIN_PERM, | |
650 | }, | |
651 | { | |
652 | .cmd = CGROUPSTATS_CMD_GET, | |
653 | .doit = cgroupstats_user_cmd, | |
654 | .policy = cgroupstats_cmd_get_policy, | |
655 | }, | |
846c7bb0 BS |
656 | }; |
657 | ||
c757249a SN |
658 | /* Needed early in initialization */ |
659 | void __init taskstats_init_early(void) | |
660 | { | |
f9fd8914 SN |
661 | unsigned int i; |
662 | ||
0a31bd5f | 663 | taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC); |
f9fd8914 SN |
664 | for_each_possible_cpu(i) { |
665 | INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); | |
666 | init_rwsem(&(per_cpu(listener_array, i).sem)); | |
667 | } | |
c757249a SN |
668 | } |
669 | ||
670 | static int __init taskstats_init(void) | |
671 | { | |
672 | int rc; | |
673 | ||
c53ed742 | 674 | rc = genl_register_family_with_ops(&family, taskstats_ops); |
c757249a SN |
675 | if (rc) |
676 | return rc; | |
677 | ||
c757249a | 678 | family_registered = 1; |
f9b182e2 | 679 | pr_info("registered taskstats version %d\n", TASKSTATS_GENL_VERSION); |
c757249a | 680 | return 0; |
c757249a SN |
681 | } |
682 | ||
683 | /* | |
684 | * late initcall ensures initialization of statistics collection | |
685 | * mechanisms precedes initialization of the taskstats interface | |
686 | */ | |
687 | late_initcall(taskstats_init); |