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Source at commit fbf123cd4cc0c097fe9a99c90109ebb2a5e94a50 created 10 years 3 months ago. By Lars-Peter Clausen, dma: jz4740: Dequeue descriptor from active list before completing it | |
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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 <linux/pid_namespace.h> |
31 | #include <net/genetlink.h> |
32 | #include <linux/atomic.h> |
33 | |
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 | |
40 | static DEFINE_PER_CPU(__u32, taskstats_seqnum); |
41 | static int family_registered; |
42 | struct kmem_cache *taskstats_cache; |
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 | |
51 | static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = { |
52 | [TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, |
53 | [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, |
54 | [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, |
55 | [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; |
56 | |
57 | static const struct nla_policy cgroupstats_cmd_get_policy[CGROUPSTATS_CMD_ATTR_MAX+1] = { |
58 | [CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, |
59 | }; |
60 | |
61 | struct listener { |
62 | struct list_head list; |
63 | pid_t pid; |
64 | char valid; |
65 | }; |
66 | |
67 | struct listener_list { |
68 | struct rw_semaphore sem; |
69 | struct list_head list; |
70 | }; |
71 | static DEFINE_PER_CPU(struct listener_list, listener_array); |
72 | |
73 | enum actions { |
74 | REGISTER, |
75 | DEREGISTER, |
76 | CPU_DONT_CARE |
77 | }; |
78 | |
79 | static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, |
80 | size_t size) |
81 | { |
82 | struct sk_buff *skb; |
83 | void *reply; |
84 | |
85 | /* |
86 | * If new attributes are added, please revisit this allocation |
87 | */ |
88 | skb = genlmsg_new(size, GFP_KERNEL); |
89 | if (!skb) |
90 | return -ENOMEM; |
91 | |
92 | if (!info) { |
93 | int seq = this_cpu_inc_return(taskstats_seqnum) - 1; |
94 | |
95 | reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
96 | } else |
97 | reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
98 | if (reply == NULL) { |
99 | nlmsg_free(skb); |
100 | return -EINVAL; |
101 | } |
102 | |
103 | *skbp = skb; |
104 | return 0; |
105 | } |
106 | |
107 | /* |
108 | * Send taskstats data in @skb to listener with nl_pid @pid |
109 | */ |
110 | static int send_reply(struct sk_buff *skb, struct genl_info *info) |
111 | { |
112 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
113 | void *reply = genlmsg_data(genlhdr); |
114 | int rc; |
115 | |
116 | rc = genlmsg_end(skb, reply); |
117 | if (rc < 0) { |
118 | nlmsg_free(skb); |
119 | return rc; |
120 | } |
121 | |
122 | return genlmsg_reply(skb, info); |
123 | } |
124 | |
125 | /* |
126 | * Send taskstats data in @skb to listeners registered for @cpu's exit data |
127 | */ |
128 | static void send_cpu_listeners(struct sk_buff *skb, |
129 | struct listener_list *listeners) |
130 | { |
131 | struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
132 | struct listener *s, *tmp; |
133 | struct sk_buff *skb_next, *skb_cur = skb; |
134 | void *reply = genlmsg_data(genlhdr); |
135 | int rc, delcount = 0; |
136 | |
137 | rc = genlmsg_end(skb, reply); |
138 | if (rc < 0) { |
139 | nlmsg_free(skb); |
140 | return; |
141 | } |
142 | |
143 | rc = 0; |
144 | down_read(&listeners->sem); |
145 | list_for_each_entry(s, &listeners->list, list) { |
146 | skb_next = NULL; |
147 | if (!list_is_last(&s->list, &listeners->list)) { |
148 | skb_next = skb_clone(skb_cur, GFP_KERNEL); |
149 | if (!skb_next) |
150 | break; |
151 | } |
152 | rc = genlmsg_unicast(&init_net, skb_cur, s->pid); |
153 | if (rc == -ECONNREFUSED) { |
154 | s->valid = 0; |
155 | delcount++; |
156 | } |
157 | skb_cur = skb_next; |
158 | } |
159 | up_read(&listeners->sem); |
160 | |
161 | if (skb_cur) |
162 | nlmsg_free(skb_cur); |
163 | |
164 | if (!delcount) |
165 | return; |
166 | |
167 | /* Delete invalidated entries */ |
168 | down_write(&listeners->sem); |
169 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
170 | if (!s->valid) { |
171 | list_del(&s->list); |
172 | kfree(s); |
173 | } |
174 | } |
175 | up_write(&listeners->sem); |
176 | } |
177 | |
178 | static void fill_stats(struct user_namespace *user_ns, |
179 | struct pid_namespace *pid_ns, |
180 | struct task_struct *tsk, struct taskstats *stats) |
181 | { |
182 | memset(stats, 0, sizeof(*stats)); |
183 | /* |
184 | * Each accounting subsystem adds calls to its functions to |
185 | * fill in relevant parts of struct taskstsats as follows |
186 | * |
187 | * per-task-foo(stats, tsk); |
188 | */ |
189 | |
190 | delayacct_add_tsk(stats, tsk); |
191 | |
192 | /* fill in basic acct fields */ |
193 | stats->version = TASKSTATS_VERSION; |
194 | stats->nvcsw = tsk->nvcsw; |
195 | stats->nivcsw = tsk->nivcsw; |
196 | bacct_add_tsk(user_ns, pid_ns, stats, tsk); |
197 | |
198 | /* fill in extended acct fields */ |
199 | xacct_add_tsk(stats, tsk); |
200 | } |
201 | |
202 | static int fill_stats_for_pid(pid_t pid, struct taskstats *stats) |
203 | { |
204 | struct task_struct *tsk; |
205 | |
206 | rcu_read_lock(); |
207 | tsk = find_task_by_vpid(pid); |
208 | if (tsk) |
209 | get_task_struct(tsk); |
210 | rcu_read_unlock(); |
211 | if (!tsk) |
212 | return -ESRCH; |
213 | fill_stats(current_user_ns(), task_active_pid_ns(current), tsk, stats); |
214 | put_task_struct(tsk); |
215 | return 0; |
216 | } |
217 | |
218 | static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) |
219 | { |
220 | struct task_struct *tsk, *first; |
221 | unsigned long flags; |
222 | int rc = -ESRCH; |
223 | |
224 | /* |
225 | * Add additional stats from live tasks except zombie thread group |
226 | * leaders who are already counted with the dead tasks |
227 | */ |
228 | rcu_read_lock(); |
229 | first = find_task_by_vpid(tgid); |
230 | |
231 | if (!first || !lock_task_sighand(first, &flags)) |
232 | goto out; |
233 | |
234 | if (first->signal->stats) |
235 | memcpy(stats, first->signal->stats, sizeof(*stats)); |
236 | else |
237 | memset(stats, 0, sizeof(*stats)); |
238 | |
239 | tsk = first; |
240 | do { |
241 | if (tsk->exit_state) |
242 | continue; |
243 | /* |
244 | * Accounting subsystem can call its functions here to |
245 | * fill in relevant parts of struct taskstsats as follows |
246 | * |
247 | * per-task-foo(stats, tsk); |
248 | */ |
249 | delayacct_add_tsk(stats, tsk); |
250 | |
251 | stats->nvcsw += tsk->nvcsw; |
252 | stats->nivcsw += tsk->nivcsw; |
253 | } while_each_thread(first, tsk); |
254 | |
255 | unlock_task_sighand(first, &flags); |
256 | rc = 0; |
257 | out: |
258 | rcu_read_unlock(); |
259 | |
260 | stats->version = TASKSTATS_VERSION; |
261 | /* |
262 | * Accounting subsystems can also add calls here to modify |
263 | * fields of taskstats. |
264 | */ |
265 | return rc; |
266 | } |
267 | |
268 | static void fill_tgid_exit(struct task_struct *tsk) |
269 | { |
270 | unsigned long flags; |
271 | |
272 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
273 | if (!tsk->signal->stats) |
274 | goto ret; |
275 | |
276 | /* |
277 | * Each accounting subsystem calls its functions here to |
278 | * accumalate its per-task stats for tsk, into the per-tgid structure |
279 | * |
280 | * per-task-foo(tsk->signal->stats, tsk); |
281 | */ |
282 | delayacct_add_tsk(tsk->signal->stats, tsk); |
283 | ret: |
284 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
285 | return; |
286 | } |
287 | |
288 | static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd) |
289 | { |
290 | struct listener_list *listeners; |
291 | struct listener *s, *tmp, *s2; |
292 | unsigned int cpu; |
293 | int ret = 0; |
294 | |
295 | if (!cpumask_subset(mask, cpu_possible_mask)) |
296 | return -EINVAL; |
297 | |
298 | if (current_user_ns() != &init_user_ns) |
299 | return -EINVAL; |
300 | |
301 | if (task_active_pid_ns(current) != &init_pid_ns) |
302 | return -EINVAL; |
303 | |
304 | if (isadd == REGISTER) { |
305 | for_each_cpu(cpu, mask) { |
306 | s = kmalloc_node(sizeof(struct listener), |
307 | GFP_KERNEL, cpu_to_node(cpu)); |
308 | if (!s) { |
309 | ret = -ENOMEM; |
310 | goto cleanup; |
311 | } |
312 | s->pid = pid; |
313 | s->valid = 1; |
314 | |
315 | listeners = &per_cpu(listener_array, cpu); |
316 | down_write(&listeners->sem); |
317 | list_for_each_entry(s2, &listeners->list, list) { |
318 | if (s2->pid == pid && s2->valid) |
319 | goto exists; |
320 | } |
321 | list_add(&s->list, &listeners->list); |
322 | s = NULL; |
323 | exists: |
324 | up_write(&listeners->sem); |
325 | kfree(s); /* nop if NULL */ |
326 | } |
327 | return 0; |
328 | } |
329 | |
330 | /* Deregister or cleanup */ |
331 | cleanup: |
332 | for_each_cpu(cpu, mask) { |
333 | listeners = &per_cpu(listener_array, cpu); |
334 | down_write(&listeners->sem); |
335 | list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
336 | if (s->pid == pid) { |
337 | list_del(&s->list); |
338 | kfree(s); |
339 | break; |
340 | } |
341 | } |
342 | up_write(&listeners->sem); |
343 | } |
344 | return ret; |
345 | } |
346 | |
347 | static int parse(struct nlattr *na, struct cpumask *mask) |
348 | { |
349 | char *data; |
350 | int len; |
351 | int ret; |
352 | |
353 | if (na == NULL) |
354 | return 1; |
355 | len = nla_len(na); |
356 | if (len > TASKSTATS_CPUMASK_MAXLEN) |
357 | return -E2BIG; |
358 | if (len < 1) |
359 | return -EINVAL; |
360 | data = kmalloc(len, GFP_KERNEL); |
361 | if (!data) |
362 | return -ENOMEM; |
363 | nla_strlcpy(data, na, len); |
364 | ret = cpulist_parse(data, mask); |
365 | kfree(data); |
366 | return ret; |
367 | } |
368 | |
369 | #if defined(CONFIG_64BIT) && !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
370 | #define TASKSTATS_NEEDS_PADDING 1 |
371 | #endif |
372 | |
373 | static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid) |
374 | { |
375 | struct nlattr *na, *ret; |
376 | int aggr; |
377 | |
378 | aggr = (type == TASKSTATS_TYPE_PID) |
379 | ? TASKSTATS_TYPE_AGGR_PID |
380 | : TASKSTATS_TYPE_AGGR_TGID; |
381 | |
382 | /* |
383 | * The taskstats structure is internally aligned on 8 byte |
384 | * boundaries but the layout of the aggregrate reply, with |
385 | * two NLA headers and the pid (each 4 bytes), actually |
386 | * force the entire structure to be unaligned. This causes |
387 | * the kernel to issue unaligned access warnings on some |
388 | * architectures like ia64. Unfortunately, some software out there |
389 | * doesn't properly unroll the NLA packet and assumes that the start |
390 | * of the taskstats structure will always be 20 bytes from the start |
391 | * of the netlink payload. Aligning the start of the taskstats |
392 | * structure breaks this software, which we don't want. So, for now |
393 | * the alignment only happens on architectures that require it |
394 | * and those users will have to update to fixed versions of those |
395 | * packages. Space is reserved in the packet only when needed. |
396 | * This ifdef should be removed in several years e.g. 2012 once |
397 | * we can be confident that fixed versions are installed on most |
398 | * systems. We add the padding before the aggregate since the |
399 | * aggregate is already a defined type. |
400 | */ |
401 | #ifdef TASKSTATS_NEEDS_PADDING |
402 | if (nla_put(skb, TASKSTATS_TYPE_NULL, 0, NULL) < 0) |
403 | goto err; |
404 | #endif |
405 | na = nla_nest_start(skb, aggr); |
406 | if (!na) |
407 | goto err; |
408 | |
409 | if (nla_put(skb, type, sizeof(pid), &pid) < 0) { |
410 | nla_nest_cancel(skb, na); |
411 | goto err; |
412 | } |
413 | ret = nla_reserve(skb, TASKSTATS_TYPE_STATS, sizeof(struct taskstats)); |
414 | if (!ret) { |
415 | nla_nest_cancel(skb, na); |
416 | goto err; |
417 | } |
418 | nla_nest_end(skb, na); |
419 | |
420 | return nla_data(ret); |
421 | err: |
422 | return NULL; |
423 | } |
424 | |
425 | static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
426 | { |
427 | int rc = 0; |
428 | struct sk_buff *rep_skb; |
429 | struct cgroupstats *stats; |
430 | struct nlattr *na; |
431 | size_t size; |
432 | u32 fd; |
433 | struct fd f; |
434 | |
435 | na = info->attrs[CGROUPSTATS_CMD_ATTR_FD]; |
436 | if (!na) |
437 | return -EINVAL; |
438 | |
439 | fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]); |
440 | f = fdget(fd); |
441 | if (!f.file) |
442 | return 0; |
443 | |
444 | size = nla_total_size(sizeof(struct cgroupstats)); |
445 | |
446 | rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb, |
447 | size); |
448 | if (rc < 0) |
449 | goto err; |
450 | |
451 | na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS, |
452 | sizeof(struct cgroupstats)); |
453 | if (na == NULL) { |
454 | nlmsg_free(rep_skb); |
455 | rc = -EMSGSIZE; |
456 | goto err; |
457 | } |
458 | |
459 | stats = nla_data(na); |
460 | memset(stats, 0, sizeof(*stats)); |
461 | |
462 | rc = cgroupstats_build(stats, f.file->f_dentry); |
463 | if (rc < 0) { |
464 | nlmsg_free(rep_skb); |
465 | goto err; |
466 | } |
467 | |
468 | rc = send_reply(rep_skb, info); |
469 | |
470 | err: |
471 | fdput(f); |
472 | return rc; |
473 | } |
474 | |
475 | static int cmd_attr_register_cpumask(struct genl_info *info) |
476 | { |
477 | cpumask_var_t mask; |
478 | int rc; |
479 | |
480 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
481 | return -ENOMEM; |
482 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask); |
483 | if (rc < 0) |
484 | goto out; |
485 | rc = add_del_listener(info->snd_portid, mask, REGISTER); |
486 | out: |
487 | free_cpumask_var(mask); |
488 | return rc; |
489 | } |
490 | |
491 | static int cmd_attr_deregister_cpumask(struct genl_info *info) |
492 | { |
493 | cpumask_var_t mask; |
494 | int rc; |
495 | |
496 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
497 | return -ENOMEM; |
498 | rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask); |
499 | if (rc < 0) |
500 | goto out; |
501 | rc = add_del_listener(info->snd_portid, mask, DEREGISTER); |
502 | out: |
503 | free_cpumask_var(mask); |
504 | return rc; |
505 | } |
506 | |
507 | static size_t taskstats_packet_size(void) |
508 | { |
509 | size_t size; |
510 | |
511 | size = nla_total_size(sizeof(u32)) + |
512 | nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
513 | #ifdef TASKSTATS_NEEDS_PADDING |
514 | size += nla_total_size(0); /* Padding for alignment */ |
515 | #endif |
516 | return size; |
517 | } |
518 | |
519 | static int cmd_attr_pid(struct genl_info *info) |
520 | { |
521 | struct taskstats *stats; |
522 | struct sk_buff *rep_skb; |
523 | size_t size; |
524 | u32 pid; |
525 | int rc; |
526 | |
527 | size = taskstats_packet_size(); |
528 | |
529 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
530 | if (rc < 0) |
531 | return rc; |
532 | |
533 | rc = -EINVAL; |
534 | pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); |
535 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid); |
536 | if (!stats) |
537 | goto err; |
538 | |
539 | rc = fill_stats_for_pid(pid, stats); |
540 | if (rc < 0) |
541 | goto err; |
542 | return send_reply(rep_skb, info); |
543 | err: |
544 | nlmsg_free(rep_skb); |
545 | return rc; |
546 | } |
547 | |
548 | static int cmd_attr_tgid(struct genl_info *info) |
549 | { |
550 | struct taskstats *stats; |
551 | struct sk_buff *rep_skb; |
552 | size_t size; |
553 | u32 tgid; |
554 | int rc; |
555 | |
556 | size = taskstats_packet_size(); |
557 | |
558 | rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
559 | if (rc < 0) |
560 | return rc; |
561 | |
562 | rc = -EINVAL; |
563 | tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); |
564 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid); |
565 | if (!stats) |
566 | goto err; |
567 | |
568 | rc = fill_stats_for_tgid(tgid, stats); |
569 | if (rc < 0) |
570 | goto err; |
571 | return send_reply(rep_skb, info); |
572 | err: |
573 | nlmsg_free(rep_skb); |
574 | return rc; |
575 | } |
576 | |
577 | static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
578 | { |
579 | if (info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK]) |
580 | return cmd_attr_register_cpumask(info); |
581 | else if (info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK]) |
582 | return cmd_attr_deregister_cpumask(info); |
583 | else if (info->attrs[TASKSTATS_CMD_ATTR_PID]) |
584 | return cmd_attr_pid(info); |
585 | else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) |
586 | return cmd_attr_tgid(info); |
587 | else |
588 | return -EINVAL; |
589 | } |
590 | |
591 | static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk) |
592 | { |
593 | struct signal_struct *sig = tsk->signal; |
594 | struct taskstats *stats; |
595 | |
596 | if (sig->stats || thread_group_empty(tsk)) |
597 | goto ret; |
598 | |
599 | /* No problem if kmem_cache_zalloc() fails */ |
600 | stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); |
601 | |
602 | spin_lock_irq(&tsk->sighand->siglock); |
603 | if (!sig->stats) { |
604 | sig->stats = stats; |
605 | stats = NULL; |
606 | } |
607 | spin_unlock_irq(&tsk->sighand->siglock); |
608 | |
609 | if (stats) |
610 | kmem_cache_free(taskstats_cache, stats); |
611 | ret: |
612 | return sig->stats; |
613 | } |
614 | |
615 | /* Send pid data out on exit */ |
616 | void taskstats_exit(struct task_struct *tsk, int group_dead) |
617 | { |
618 | int rc; |
619 | struct listener_list *listeners; |
620 | struct taskstats *stats; |
621 | struct sk_buff *rep_skb; |
622 | size_t size; |
623 | int is_thread_group; |
624 | |
625 | if (!family_registered) |
626 | return; |
627 | |
628 | /* |
629 | * Size includes space for nested attributes |
630 | */ |
631 | size = taskstats_packet_size(); |
632 | |
633 | is_thread_group = !!taskstats_tgid_alloc(tsk); |
634 | if (is_thread_group) { |
635 | /* PID + STATS + TGID + STATS */ |
636 | size = 2 * size; |
637 | /* fill the tsk->signal->stats structure */ |
638 | fill_tgid_exit(tsk); |
639 | } |
640 | |
641 | listeners = __this_cpu_ptr(&listener_array); |
642 | if (list_empty(&listeners->list)) |
643 | return; |
644 | |
645 | rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size); |
646 | if (rc < 0) |
647 | return; |
648 | |
649 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, |
650 | task_pid_nr_ns(tsk, &init_pid_ns)); |
651 | if (!stats) |
652 | goto err; |
653 | |
654 | fill_stats(&init_user_ns, &init_pid_ns, tsk, stats); |
655 | |
656 | /* |
657 | * Doesn't matter if tsk is the leader or the last group member leaving |
658 | */ |
659 | if (!is_thread_group || !group_dead) |
660 | goto send; |
661 | |
662 | stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, |
663 | task_tgid_nr_ns(tsk, &init_pid_ns)); |
664 | if (!stats) |
665 | goto err; |
666 | |
667 | memcpy(stats, tsk->signal->stats, sizeof(*stats)); |
668 | |
669 | send: |
670 | send_cpu_listeners(rep_skb, listeners); |
671 | return; |
672 | err: |
673 | nlmsg_free(rep_skb); |
674 | } |
675 | |
676 | static const struct genl_ops taskstats_ops[] = { |
677 | { |
678 | .cmd = TASKSTATS_CMD_GET, |
679 | .doit = taskstats_user_cmd, |
680 | .policy = taskstats_cmd_get_policy, |
681 | .flags = GENL_ADMIN_PERM, |
682 | }, |
683 | { |
684 | .cmd = CGROUPSTATS_CMD_GET, |
685 | .doit = cgroupstats_user_cmd, |
686 | .policy = cgroupstats_cmd_get_policy, |
687 | }, |
688 | }; |
689 | |
690 | /* Needed early in initialization */ |
691 | void __init taskstats_init_early(void) |
692 | { |
693 | unsigned int i; |
694 | |
695 | taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC); |
696 | for_each_possible_cpu(i) { |
697 | INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); |
698 | init_rwsem(&(per_cpu(listener_array, i).sem)); |
699 | } |
700 | } |
701 | |
702 | static int __init taskstats_init(void) |
703 | { |
704 | int rc; |
705 | |
706 | rc = genl_register_family_with_ops(&family, taskstats_ops); |
707 | if (rc) |
708 | return rc; |
709 | |
710 | family_registered = 1; |
711 | pr_info("registered taskstats version %d\n", TASKSTATS_GENL_VERSION); |
712 | return 0; |
713 | } |
714 | |
715 | /* |
716 | * late initcall ensures initialization of statistics collection |
717 | * mechanisms precedes initialization of the taskstats interface |
718 | */ |
719 | late_initcall(taskstats_init); |
720 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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v3.9