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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> |
21 | #include <linux/tsacct_kern.h> |
22 | #include <linux/delayacct.h> |
23 | #include <linux/cpumask.h> |
24 | #include <linux/percpu.h> |
25 | #include <linux/slab.h> |
26 | #include <linux/cgroupstats.h> |
27 | #include <linux/cgroup.h> |
28 | #include <linux/fs.h> |
29 | #include <linux/file.h> |
30 | #include <net/genetlink.h> |
31 | #include <asm/atomic.h> |
32 | |
33 | /* |
34 | * Maximum length of a cpumask that can be specified in |
35 | * the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute |
36 | */ |
37 | #define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS) |
38 | |
39 | static DEFINE_PER_CPU(__u32, taskstats_seqnum); |
40 | static int family_registered; |
41 | struct kmem_cache *taskstats_cache; |
42 | |
43 | static struct genl_family family = { |
44 | .id = GENL_ID_GENERATE, |
45 | .name = TASKSTATS_GENL_NAME, |
46 | .version = TASKSTATS_GENL_VERSION, |
47 | .maxattr = TASKSTATS_CMD_ATTR_MAX, |
48 | }; |
49 | |
50 | static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = { |
51 | [TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, |
52 | [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, |
53 | [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, |
54 | [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; |
55 | |
56 | static const struct nla_policy cgroupstats_cmd_get_policy[CGROUPSTATS_CMD_ATTR_MAX+1] = { |
57 | [CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, |
58 | }; |
59 | |
60 | struct listener { |
61 | struct list_head list; |
62 | pid_t pid; |
63 | char valid; |
64 | }; |
65 | |
66 | struct listener_list { |
67 | struct rw_semaphore sem; |
68 | struct list_head list; |
69 | }; |
70 | static DEFINE_PER_CPU(struct listener_list, listener_array); |
71 | |
72 | enum actions { |
73 | REGISTER, |
74 | DEREGISTER, |
75 | CPU_DONT_CARE |
76 | }; |
77 | |
78 | static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, |
79 | size_t size) |
80 | { |
81 | struct sk_buff *skb; |
82 | void *reply; |
83 | |
84 | /* |
85 | * If new attributes are added, please revisit this allocation |
86 | */ |
87 | skb = genlmsg_new(size, GFP_KERNEL); |
88 | if (!skb) |
89 | return -ENOMEM; |
90 | |
91 | if (!info) { |
92 | int seq = this_cpu_inc_return(taskstats_seqnum) - 1; |
93 | |
94 | reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
95 | } else |
96 | reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
97 | if (reply == NULL) { |
98 | nlmsg_free(skb); |
99 | return -EINVAL; |
100 | } |
101 | |
102 | *skbp = skb; |
103 | return 0; |
104 | } |
105 | |
106 | /* |
107 | * Send taskstats data in @skb to listener with nl_pid @pid |
108 | */ |
109 | static int send_reply(struct sk_buff *skb, struct genl_info *info) |
110 | { |
111 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
112 | void *reply = genlmsg_data(genlhdr); |
113 | int rc; |
114 | |
115 | rc = genlmsg_end(skb, reply); |
116 | if (rc < 0) { |
117 | nlmsg_free(skb); |
118 | return rc; |
119 | } |
120 | |
121 | return genlmsg_reply(skb, info); |
122 | } |
123 | |
124 | /* |
125 | * Send taskstats data in @skb to listeners registered for @cpu's exit data |
126 | */ |
127 | static void send_cpu_listeners(struct sk_buff *skb, |
128 | struct listener_list *listeners) |
129 | { |
130 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
131 | struct listener *s, *tmp; |
132 | struct sk_buff *skb_next, *skb_cur = skb; |
133 | void *reply = genlmsg_data(genlhdr); |
134 | int rc, delcount = 0; |
135 | |
136 | rc = genlmsg_end(skb, reply); |
137 | if (rc < 0) { |
138 | nlmsg_free(skb); |
139 | return; |
140 | } |
141 | |
142 | rc = 0; |
143 | down_read(&listeners->sem); |
144 | list_for_each_entry(s, &listeners->list, list) { |
145 | skb_next = NULL; |
146 | if (!list_is_last(&s->list, &listeners->list)) { |
147 | skb_next = skb_clone(skb_cur, GFP_KERNEL); |
148 | if (!skb_next) |
149 | break; |
150 | } |
151 | rc = genlmsg_unicast(&init_net, skb_cur, s->pid); |
152 | if (rc == -ECONNREFUSED) { |
153 | s->valid = 0; |
154 | delcount++; |
155 | } |
156 | skb_cur = skb_next; |
157 | } |
158 | up_read(&listeners->sem); |
159 | |
160 | if (skb_cur) |
161 | nlmsg_free(skb_cur); |
162 | |
163 | if (!delcount) |
164 | return; |
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); |
175 | } |
176 | |
177 | static void fill_stats(struct task_struct *tsk, struct taskstats *stats) |
178 | { |
179 | memset(stats, 0, sizeof(*stats)); |
180 | /* |
181 | * Each accounting subsystem adds calls to its functions to |
182 | * fill in relevant parts of struct taskstsats as follows |
183 | * |
184 | * per-task-foo(stats, tsk); |
185 | */ |
186 | |
187 | delayacct_add_tsk(stats, tsk); |
188 | |
189 | /* fill in basic acct fields */ |
190 | stats->version = TASKSTATS_VERSION; |
191 | stats->nvcsw = tsk->nvcsw; |
192 | stats->nivcsw = tsk->nivcsw; |
193 | bacct_add_tsk(stats, tsk); |
194 | |
195 | /* fill in extended acct fields */ |
196 | xacct_add_tsk(stats, tsk); |
197 | } |
198 | |
199 | static int fill_stats_for_pid(pid_t pid, struct taskstats *stats) |
200 | { |
201 | struct task_struct *tsk; |
202 | |
203 | rcu_read_lock(); |
204 | tsk = find_task_by_vpid(pid); |
205 | if (tsk) |
206 | get_task_struct(tsk); |
207 | rcu_read_unlock(); |
208 | if (!tsk) |
209 | return -ESRCH; |
210 | fill_stats(tsk, stats); |
211 | put_task_struct(tsk); |
212 | return 0; |
213 | } |
214 | |
215 | static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) |
216 | { |
217 | struct task_struct *tsk, *first; |
218 | unsigned long flags; |
219 | int rc = -ESRCH; |
220 | |
221 | /* |
222 | * Add additional stats from live tasks except zombie thread group |
223 | * leaders who are already counted with the dead tasks |
224 | */ |
225 | rcu_read_lock(); |
226 | first = find_task_by_vpid(tgid); |
227 | |
228 | if (!first || !lock_task_sighand(first, &flags)) |
229 | goto out; |
230 | |
231 | if (first->signal->stats) |
232 | memcpy(stats, first->signal->stats, sizeof(*stats)); |
233 | else |
234 | memset(stats, 0, sizeof(*stats)); |
235 | |
236 | tsk = first; |
237 | do { |
238 | if (tsk->exit_state) |
239 | continue; |
240 | /* |
241 | * Accounting subsystem can call its functions here to |
242 | * fill in relevant parts of struct taskstsats as follows |
243 | * |
244 | * per-task-foo(stats, tsk); |
245 | */ |
246 | delayacct_add_tsk(stats, tsk); |
247 | |
248 | stats->nvcsw += tsk->nvcsw; |
249 | stats->nivcsw += tsk->nivcsw; |
250 | } while_each_thread(first, tsk); |
251 | |
252 | unlock_task_sighand(first, &flags); |
253 | rc = 0; |
254 | out: |
255 | rcu_read_unlock(); |
256 | |
257 | stats->version = TASKSTATS_VERSION; |
258 | /* |
259 | * Accounting subsystems can also add calls here to modify |
260 | * fields of taskstats. |
261 | */ |
262 | return rc; |
263 | } |
264 | |
265 | static void fill_tgid_exit(struct task_struct *tsk) |
266 | { |
267 | unsigned long flags; |
268 | |
269 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
270 | if (!tsk->signal->stats) |
271 | goto ret; |
272 | |
273 | /* |
274 | * Each accounting subsystem calls its functions here to |
275 | * accumalate its per-task stats for tsk, into the per-tgid structure |
276 | * |
277 | * per-task-foo(tsk->signal->stats, tsk); |
278 | */ |
279 | delayacct_add_tsk(tsk->signal->stats, tsk); |
280 | ret: |
281 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
282 | return; |
283 | } |
284 | |
285 | static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd) |
286 | { |
287 | struct listener_list *listeners; |
288 | struct listener *s, *tmp, *s2; |
289 | unsigned int cpu; |
290 | |
291 | if (!cpumask_subset(mask, cpu_possible_mask)) |
292 | return -EINVAL; |
293 | |
294 | s = NULL; |
295 | if (isadd == REGISTER) { |
296 | for_each_cpu(cpu, mask) { |
297 | if (!s) |
298 | s = kmalloc_node(sizeof(struct listener), |
299 | GFP_KERNEL, cpu_to_node(cpu)); |
300 | if (!s) |
301 | goto cleanup; |
302 | s->pid = pid; |
303 | INIT_LIST_HEAD(&s->list); |
304 | s->valid = 1; |
305 | |
306 | listeners = &per_cpu(listener_array, cpu); |
307 | down_write(&listeners->sem); |
308 | list_for_each_entry_safe(s2, tmp, &listeners->list, list) { |
309 | if (s2->pid == pid) |
310 | goto next_cpu; |
311 | } |
312 | list_add(&s->list, &listeners->list); |
313 | s = NULL; |
314 | next_cpu: |
315 | up_write(&listeners->sem); |
316 | } |
317 | kfree(s); |
318 | return 0; |
319 | } |
320 | |
321 | /* Deregister or cleanup */ |
322 | cleanup: |
323 | for_each_cpu(cpu, mask) { |
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, struct cpumask *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); |
355 | ret = cpulist_parse(data, mask); |
356 | kfree(data); |
357 | return ret; |
358 | } |
359 | |
360 | #if defined(CONFIG_64BIT) && !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
361 | #define TASKSTATS_NEEDS_PADDING 1 |
362 | #endif |
363 | |
364 | static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid) |
365 | { |
366 | struct nlattr *na, *ret; |
367 | int aggr; |
368 | |
369 | aggr = (type == TASKSTATS_TYPE_PID) |
370 | ? TASKSTATS_TYPE_AGGR_PID |
371 | : TASKSTATS_TYPE_AGGR_TGID; |
372 | |
373 | /* |
374 | * The taskstats structure is internally aligned on 8 byte |
375 | * boundaries but the layout of the aggregrate reply, with |
376 | * two NLA headers and the pid (each 4 bytes), actually |
377 | * force the entire structure to be unaligned. This causes |
378 | * the kernel to issue unaligned access warnings on some |
379 | * architectures like ia64. Unfortunately, some software out there |
380 | * doesn't properly unroll the NLA packet and assumes that the start |
381 | * of the taskstats structure will always be 20 bytes from the start |
382 | * of the netlink payload. Aligning the start of the taskstats |
383 | * structure breaks this software, which we don't want. So, for now |
384 | * the alignment only happens on architectures that require it |
385 | * and those users will have to update to fixed versions of those |
386 | * packages. Space is reserved in the packet only when needed. |
387 | * This ifdef should be removed in several years e.g. 2012 once |
388 | * we can be confident that fixed versions are installed on most |
389 | * systems. We add the padding before the aggregate since the |
390 | * aggregate is already a defined type. |
391 | */ |
392 | #ifdef TASKSTATS_NEEDS_PADDING |
393 | if (nla_put(skb, TASKSTATS_TYPE_NULL, 0, NULL) < 0) |
394 | goto err; |
395 | #endif |
396 | na = nla_nest_start(skb, aggr); |
397 | if (!na) |
398 | goto err; |
399 | |
400 | if (nla_put(skb, type, sizeof(pid), &pid) < 0) |
401 | goto err; |
402 | ret = nla_reserve(skb, TASKSTATS_TYPE_STATS, sizeof(struct taskstats)); |
403 | if (!ret) |
404 | goto err; |
405 | nla_nest_end(skb, na); |
406 | |
407 | return nla_data(ret); |
408 | err: |
409 | return NULL; |
410 | } |
411 | |
412 | static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
413 | { |
414 | int rc = 0; |
415 | struct sk_buff *rep_skb; |
416 | struct cgroupstats *stats; |
417 | struct nlattr *na; |
418 | size_t size; |
419 | u32 fd; |
420 | struct file *file; |
421 | int fput_needed; |
422 | |
423 | na = info->attrs[CGROUPSTATS_CMD_ATTR_FD]; |
424 | if (!na) |
425 | return -EINVAL; |
426 | |
427 | fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]); |
428 | file = fget_light(fd, &fput_needed); |
429 | if (!file) |
430 | return 0; |
431 | |
432 | size = nla_total_size(sizeof(struct cgroupstats)); |
433 | |
434 | rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb, |
435 | size); |
436 | if (rc < 0) |
437 | goto err; |
438 | |
439 | na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS, |
440 | sizeof(struct cgroupstats)); |
441 | stats = nla_data(na); |
442 | memset(stats, 0, sizeof(*stats)); |
443 | |
444 | rc = cgroupstats_build(stats, file->f_dentry); |
445 | if (rc < 0) { |
446 | nlmsg_free(rep_skb); |
447 | goto err; |
448 | } |
449 | |
450 | rc = send_reply(rep_skb, info); |
451 | |
452 | err: |
453 | fput_light(file, fput_needed); |
454 | return rc; |
455 | } |
456 | |
457 | static int cmd_attr_register_cpumask(struct genl_info *info) |
458 | { |
459 | cpumask_var_t mask; |
460 | int rc; |
461 | |
462 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
463 | return -ENOMEM; |
464 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask); |
465 | if (rc < 0) |
466 | goto out; |
467 | rc = add_del_listener(info->snd_pid, mask, REGISTER); |
468 | out: |
469 | free_cpumask_var(mask); |
470 | return rc; |
471 | } |
472 | |
473 | static int cmd_attr_deregister_cpumask(struct genl_info *info) |
474 | { |
475 | cpumask_var_t mask; |
476 | int rc; |
477 | |
478 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
479 | return -ENOMEM; |
480 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask); |
481 | if (rc < 0) |
482 | goto out; |
483 | rc = add_del_listener(info->snd_pid, mask, DEREGISTER); |
484 | out: |
485 | free_cpumask_var(mask); |
486 | return rc; |
487 | } |
488 | |
489 | static size_t taskstats_packet_size(void) |
490 | { |
491 | size_t size; |
492 | |
493 | size = nla_total_size(sizeof(u32)) + |
494 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
495 | #ifdef TASKSTATS_NEEDS_PADDING |
496 | size += nla_total_size(0); /* Padding for alignment */ |
497 | #endif |
498 | return size; |
499 | } |
500 | |
501 | static int cmd_attr_pid(struct genl_info *info) |
502 | { |
503 | struct taskstats *stats; |
504 | struct sk_buff *rep_skb; |
505 | size_t size; |
506 | u32 pid; |
507 | int rc; |
508 | |
509 | size = taskstats_packet_size(); |
510 | |
511 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
512 | if (rc < 0) |
513 | return rc; |
514 | |
515 | rc = -EINVAL; |
516 | pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); |
517 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid); |
518 | if (!stats) |
519 | goto err; |
520 | |
521 | rc = fill_stats_for_pid(pid, stats); |
522 | if (rc < 0) |
523 | goto err; |
524 | return send_reply(rep_skb, info); |
525 | err: |
526 | nlmsg_free(rep_skb); |
527 | return rc; |
528 | } |
529 | |
530 | static int cmd_attr_tgid(struct genl_info *info) |
531 | { |
532 | struct taskstats *stats; |
533 | struct sk_buff *rep_skb; |
534 | size_t size; |
535 | u32 tgid; |
536 | int rc; |
537 | |
538 | size = taskstats_packet_size(); |
539 | |
540 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
541 | if (rc < 0) |
542 | return rc; |
543 | |
544 | rc = -EINVAL; |
545 | tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); |
546 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid); |
547 | if (!stats) |
548 | goto err; |
549 | |
550 | rc = fill_stats_for_tgid(tgid, stats); |
551 | if (rc < 0) |
552 | goto err; |
553 | return send_reply(rep_skb, info); |
554 | err: |
555 | nlmsg_free(rep_skb); |
556 | return rc; |
557 | } |
558 | |
559 | static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
560 | { |
561 | if (info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK]) |
562 | return cmd_attr_register_cpumask(info); |
563 | else if (info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK]) |
564 | return cmd_attr_deregister_cpumask(info); |
565 | else if (info->attrs[TASKSTATS_CMD_ATTR_PID]) |
566 | return cmd_attr_pid(info); |
567 | else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) |
568 | return cmd_attr_tgid(info); |
569 | else |
570 | return -EINVAL; |
571 | } |
572 | |
573 | static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk) |
574 | { |
575 | struct signal_struct *sig = tsk->signal; |
576 | struct taskstats *stats; |
577 | |
578 | if (sig->stats || thread_group_empty(tsk)) |
579 | goto ret; |
580 | |
581 | /* No problem if kmem_cache_zalloc() fails */ |
582 | stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); |
583 | |
584 | spin_lock_irq(&tsk->sighand->siglock); |
585 | if (!sig->stats) { |
586 | sig->stats = stats; |
587 | stats = NULL; |
588 | } |
589 | spin_unlock_irq(&tsk->sighand->siglock); |
590 | |
591 | if (stats) |
592 | kmem_cache_free(taskstats_cache, stats); |
593 | ret: |
594 | return sig->stats; |
595 | } |
596 | |
597 | /* Send pid data out on exit */ |
598 | void taskstats_exit(struct task_struct *tsk, int group_dead) |
599 | { |
600 | int rc; |
601 | struct listener_list *listeners; |
602 | struct taskstats *stats; |
603 | struct sk_buff *rep_skb; |
604 | size_t size; |
605 | int is_thread_group; |
606 | |
607 | if (!family_registered) |
608 | return; |
609 | |
610 | /* |
611 | * Size includes space for nested attributes |
612 | */ |
613 | size = taskstats_packet_size(); |
614 | |
615 | is_thread_group = !!taskstats_tgid_alloc(tsk); |
616 | if (is_thread_group) { |
617 | /* PID + STATS + TGID + STATS */ |
618 | size = 2 * size; |
619 | /* fill the tsk->signal->stats structure */ |
620 | fill_tgid_exit(tsk); |
621 | } |
622 | |
623 | listeners = __this_cpu_ptr(&listener_array); |
624 | if (list_empty(&listeners->list)) |
625 | return; |
626 | |
627 | rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size); |
628 | if (rc < 0) |
629 | return; |
630 | |
631 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, tsk->pid); |
632 | if (!stats) |
633 | goto err; |
634 | |
635 | fill_stats(tsk, stats); |
636 | |
637 | /* |
638 | * Doesn't matter if tsk is the leader or the last group member leaving |
639 | */ |
640 | if (!is_thread_group || !group_dead) |
641 | goto send; |
642 | |
643 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tsk->tgid); |
644 | if (!stats) |
645 | goto err; |
646 | |
647 | memcpy(stats, tsk->signal->stats, sizeof(*stats)); |
648 | |
649 | send: |
650 | send_cpu_listeners(rep_skb, listeners); |
651 | return; |
652 | err: |
653 | nlmsg_free(rep_skb); |
654 | } |
655 | |
656 | static struct genl_ops taskstats_ops = { |
657 | .cmd = TASKSTATS_CMD_GET, |
658 | .doit = taskstats_user_cmd, |
659 | .policy = taskstats_cmd_get_policy, |
660 | }; |
661 | |
662 | static struct genl_ops cgroupstats_ops = { |
663 | .cmd = CGROUPSTATS_CMD_GET, |
664 | .doit = cgroupstats_user_cmd, |
665 | .policy = cgroupstats_cmd_get_policy, |
666 | }; |
667 | |
668 | /* Needed early in initialization */ |
669 | void __init taskstats_init_early(void) |
670 | { |
671 | unsigned int i; |
672 | |
673 | taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC); |
674 | for_each_possible_cpu(i) { |
675 | INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); |
676 | init_rwsem(&(per_cpu(listener_array, i).sem)); |
677 | } |
678 | } |
679 | |
680 | static int __init taskstats_init(void) |
681 | { |
682 | int rc; |
683 | |
684 | rc = genl_register_family(&family); |
685 | if (rc) |
686 | return rc; |
687 | |
688 | rc = genl_register_ops(&family, &taskstats_ops); |
689 | if (rc < 0) |
690 | goto err; |
691 | |
692 | rc = genl_register_ops(&family, &cgroupstats_ops); |
693 | if (rc < 0) |
694 | goto err_cgroup_ops; |
695 | |
696 | family_registered = 1; |
697 | pr_info("registered taskstats version %d\n", TASKSTATS_GENL_VERSION); |
698 | return 0; |
699 | err_cgroup_ops: |
700 | genl_unregister_ops(&family, &taskstats_ops); |
701 | err: |
702 | genl_unregister_family(&family); |
703 | return rc; |
704 | } |
705 | |
706 | /* |
707 | * late initcall ensures initialization of statistics collection |
708 | * mechanisms precedes initialization of the taskstats interface |
709 | */ |
710 | late_initcall(taskstats_init); |
711 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9