Blame view
kernel/taskstats.c
13.8 KB
c757249af [PATCH] per-task-... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
/* * taskstats.c - Export per-task statistics to userland * * Copyright (C) Shailabh Nagar, IBM Corp. 2006 * (C) Balbir Singh, IBM Corp. 2006 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/kernel.h> #include <linux/taskstats_kern.h> |
f3cef7a99 [PATCH] csa: basi... |
21 |
#include <linux/tsacct_kern.h> |
6f44993fe [PATCH] per-task-... |
22 |
#include <linux/delayacct.h> |
f9fd8914c [PATCH] per-task ... |
23 24 |
#include <linux/cpumask.h> #include <linux/percpu.h> |
5a0e3ad6a include cleanup: ... |
25 |
#include <linux/slab.h> |
846c7bb05 Add cgroupstats |
26 27 28 29 |
#include <linux/cgroupstats.h> #include <linux/cgroup.h> #include <linux/fs.h> #include <linux/file.h> |
c757249af [PATCH] per-task-... |
30 31 |
#include <net/genetlink.h> #include <asm/atomic.h> |
f9fd8914c [PATCH] per-task ... |
32 33 34 35 36 |
/* * Maximum length of a cpumask that can be specified in * the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute */ #define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS) |
b81f3ea92 taskstats: remove... |
37 |
static DEFINE_PER_CPU(__u32, taskstats_seqnum); |
c757249af [PATCH] per-task-... |
38 |
static int family_registered; |
e18b890bb [PATCH] slab: rem... |
39 |
struct kmem_cache *taskstats_cache; |
c757249af [PATCH] per-task-... |
40 41 42 43 44 45 46 |
static struct genl_family family = { .id = GENL_ID_GENERATE, .name = TASKSTATS_GENL_NAME, .version = TASKSTATS_GENL_VERSION, .maxattr = TASKSTATS_CMD_ATTR_MAX, }; |
b54452b07 const: struct nla... |
47 |
static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = { |
c757249af [PATCH] per-task-... |
48 49 |
[TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, |
f9fd8914c [PATCH] per-task ... |
50 51 |
[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; |
b54452b07 const: struct nla... |
52 |
static const struct nla_policy cgroupstats_cmd_get_policy[CGROUPSTATS_CMD_ATTR_MAX+1] = { |
846c7bb05 Add cgroupstats |
53 54 |
[CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, }; |
f9fd8914c [PATCH] per-task ... |
55 56 57 |
struct listener { struct list_head list; pid_t pid; |
bb129994c [PATCH] Remove do... |
58 |
char valid; |
c757249af [PATCH] per-task-... |
59 |
}; |
f9fd8914c [PATCH] per-task ... |
60 61 62 63 64 65 66 67 68 69 70 |
struct listener_list { struct rw_semaphore sem; struct list_head list; }; static DEFINE_PER_CPU(struct listener_list, listener_array); enum actions { REGISTER, DEREGISTER, CPU_DONT_CARE }; |
c757249af [PATCH] per-task-... |
71 72 |
static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, |
371674853 [PATCH] taskstats... |
73 |
size_t size) |
c757249af [PATCH] per-task-... |
74 75 76 77 78 79 80 |
{ struct sk_buff *skb; void *reply; /* * If new attributes are added, please revisit this allocation */ |
3dabc7157 [GENL]: Add genlm... |
81 |
skb = genlmsg_new(size, GFP_KERNEL); |
c757249af [PATCH] per-task-... |
82 83 84 85 86 87 |
if (!skb) return -ENOMEM; if (!info) { int seq = get_cpu_var(taskstats_seqnum)++; put_cpu_var(taskstats_seqnum); |
17c157c88 [GENL]: Add genlm... |
88 |
reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
c757249af [PATCH] per-task-... |
89 |
} else |
17c157c88 [GENL]: Add genlm... |
90 |
reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
c757249af [PATCH] per-task-... |
91 92 93 94 95 96 |
if (reply == NULL) { nlmsg_free(skb); return -EINVAL; } *skbp = skb; |
c757249af [PATCH] per-task-... |
97 98 |
return 0; } |
f9fd8914c [PATCH] per-task ... |
99 100 101 |
/* * Send taskstats data in @skb to listener with nl_pid @pid */ |
134e63756 genetlink: make n... |
102 |
static int send_reply(struct sk_buff *skb, struct genl_info *info) |
c757249af [PATCH] per-task-... |
103 |
{ |
b529ccf27 [NETLINK]: Introd... |
104 |
struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
f9fd8914c [PATCH] per-task ... |
105 |
void *reply = genlmsg_data(genlhdr); |
c757249af [PATCH] per-task-... |
106 |
int rc; |
c757249af [PATCH] per-task-... |
107 108 109 110 111 |
rc = genlmsg_end(skb, reply); if (rc < 0) { nlmsg_free(skb); return rc; } |
134e63756 genetlink: make n... |
112 |
return genlmsg_reply(skb, info); |
c757249af [PATCH] per-task-... |
113 |
} |
f9fd8914c [PATCH] per-task ... |
114 115 116 |
/* * Send taskstats data in @skb to listeners registered for @cpu's exit data */ |
115085ea0 [PATCH] taskstats... |
117 118 |
static void send_cpu_listeners(struct sk_buff *skb, struct listener_list *listeners) |
f9fd8914c [PATCH] per-task ... |
119 |
{ |
b529ccf27 [NETLINK]: Introd... |
120 |
struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
f9fd8914c [PATCH] per-task ... |
121 122 123 |
struct listener *s, *tmp; struct sk_buff *skb_next, *skb_cur = skb; void *reply = genlmsg_data(genlhdr); |
d94a04151 [PATCH] taskstats... |
124 |
int rc, delcount = 0; |
f9fd8914c [PATCH] per-task ... |
125 126 127 128 |
rc = genlmsg_end(skb, reply); if (rc < 0) { nlmsg_free(skb); |
d94a04151 [PATCH] taskstats... |
129 |
return; |
f9fd8914c [PATCH] per-task ... |
130 131 132 |
} rc = 0; |
bb129994c [PATCH] Remove do... |
133 |
down_read(&listeners->sem); |
d94a04151 [PATCH] taskstats... |
134 |
list_for_each_entry(s, &listeners->list, list) { |
f9fd8914c [PATCH] per-task ... |
135 136 137 |
skb_next = NULL; if (!list_is_last(&s->list, &listeners->list)) { skb_next = skb_clone(skb_cur, GFP_KERNEL); |
d94a04151 [PATCH] taskstats... |
138 |
if (!skb_next) |
f9fd8914c [PATCH] per-task ... |
139 |
break; |
f9fd8914c [PATCH] per-task ... |
140 |
} |
134e63756 genetlink: make n... |
141 |
rc = genlmsg_unicast(&init_net, skb_cur, s->pid); |
d94a04151 [PATCH] taskstats... |
142 |
if (rc == -ECONNREFUSED) { |
bb129994c [PATCH] Remove do... |
143 144 |
s->valid = 0; delcount++; |
f9fd8914c [PATCH] per-task ... |
145 146 147 |
} skb_cur = skb_next; } |
bb129994c [PATCH] Remove do... |
148 |
up_read(&listeners->sem); |
f9fd8914c [PATCH] per-task ... |
149 |
|
d94a04151 [PATCH] taskstats... |
150 151 |
if (skb_cur) nlmsg_free(skb_cur); |
bb129994c [PATCH] Remove do... |
152 |
if (!delcount) |
d94a04151 [PATCH] taskstats... |
153 |
return; |
bb129994c [PATCH] Remove do... |
154 155 156 157 158 159 160 161 162 163 |
/* Delete invalidated entries */ down_write(&listeners->sem); list_for_each_entry_safe(s, tmp, &listeners->list, list) { if (!s->valid) { list_del(&s->list); kfree(s); } } up_write(&listeners->sem); |
f9fd8914c [PATCH] per-task ... |
164 |
} |
a98b60942 [PATCH] taskstats... |
165 |
static int fill_pid(pid_t pid, struct task_struct *tsk, |
c757249af [PATCH] per-task-... |
166 167 |
struct taskstats *stats) { |
7d94dddd4 [PATCH] make task... |
168 |
int rc = 0; |
c757249af [PATCH] per-task-... |
169 |
|
a98b60942 [PATCH] taskstats... |
170 171 |
if (!tsk) { rcu_read_lock(); |
cb41d6d06 Use find_task_by_... |
172 |
tsk = find_task_by_vpid(pid); |
a98b60942 [PATCH] taskstats... |
173 174 175 176 |
if (tsk) get_task_struct(tsk); rcu_read_unlock(); if (!tsk) |
c757249af [PATCH] per-task-... |
177 |
return -ESRCH; |
c757249af [PATCH] per-task-... |
178 179 |
} else get_task_struct(tsk); |
51de4d908 [PATCH] taskstats... |
180 |
memset(stats, 0, sizeof(*stats)); |
c757249af [PATCH] per-task-... |
181 182 183 184 |
/* * Each accounting subsystem adds calls to its functions to * fill in relevant parts of struct taskstsats as follows * |
7d94dddd4 [PATCH] make task... |
185 |
* per-task-foo(stats, tsk); |
c757249af [PATCH] per-task-... |
186 |
*/ |
7d94dddd4 [PATCH] make task... |
187 |
delayacct_add_tsk(stats, tsk); |
f3cef7a99 [PATCH] csa: basi... |
188 189 |
/* fill in basic acct fields */ |
6f44993fe [PATCH] per-task-... |
190 |
stats->version = TASKSTATS_VERSION; |
b663a79c1 taskstats: add co... |
191 192 |
stats->nvcsw = tsk->nvcsw; stats->nivcsw = tsk->nivcsw; |
f3cef7a99 [PATCH] csa: basi... |
193 |
bacct_add_tsk(stats, tsk); |
6f44993fe [PATCH] per-task-... |
194 |
|
9acc18535 [PATCH] csa: Exte... |
195 196 |
/* fill in extended acct fields */ xacct_add_tsk(stats, tsk); |
6f44993fe [PATCH] per-task-... |
197 |
/* Define err: label here if needed */ |
c757249af [PATCH] per-task-... |
198 199 200 201 |
put_task_struct(tsk); return rc; } |
a98b60942 [PATCH] taskstats... |
202 |
static int fill_tgid(pid_t tgid, struct task_struct *first, |
c757249af [PATCH] per-task-... |
203 204 |
struct taskstats *stats) { |
a98b60942 [PATCH] taskstats... |
205 |
struct task_struct *tsk; |
ad4ecbcba [PATCH] delay acc... |
206 |
unsigned long flags; |
a98b60942 [PATCH] taskstats... |
207 |
int rc = -ESRCH; |
c757249af [PATCH] per-task-... |
208 |
|
ad4ecbcba [PATCH] delay acc... |
209 210 211 212 |
/* * Add additional stats from live tasks except zombie thread group * leaders who are already counted with the dead tasks */ |
a98b60942 [PATCH] taskstats... |
213 214 |
rcu_read_lock(); if (!first) |
cb41d6d06 Use find_task_by_... |
215 |
first = find_task_by_vpid(tgid); |
ad4ecbcba [PATCH] delay acc... |
216 |
|
a98b60942 [PATCH] taskstats... |
217 218 |
if (!first || !lock_task_sighand(first, &flags)) goto out; |
ad4ecbcba [PATCH] delay acc... |
219 |
|
a98b60942 [PATCH] taskstats... |
220 221 |
if (first->signal->stats) memcpy(stats, first->signal->stats, sizeof(*stats)); |
51de4d908 [PATCH] taskstats... |
222 223 |
else memset(stats, 0, sizeof(*stats)); |
fca178c0c [PATCH] fill_tgid... |
224 |
|
a98b60942 [PATCH] taskstats... |
225 |
tsk = first; |
c757249af [PATCH] per-task-... |
226 |
do { |
d7c3f5f23 [PATCH] fill_tgid... |
227 |
if (tsk->exit_state) |
ad4ecbcba [PATCH] delay acc... |
228 |
continue; |
c757249af [PATCH] per-task-... |
229 |
/* |
ad4ecbcba [PATCH] delay acc... |
230 |
* Accounting subsystem can call its functions here to |
c757249af [PATCH] per-task-... |
231 232 |
* fill in relevant parts of struct taskstsats as follows * |
ad4ecbcba [PATCH] delay acc... |
233 |
* per-task-foo(stats, tsk); |
c757249af [PATCH] per-task-... |
234 |
*/ |
ad4ecbcba [PATCH] delay acc... |
235 |
delayacct_add_tsk(stats, tsk); |
6f44993fe [PATCH] per-task-... |
236 |
|
b663a79c1 taskstats: add co... |
237 238 |
stats->nvcsw += tsk->nvcsw; stats->nivcsw += tsk->nivcsw; |
c757249af [PATCH] per-task-... |
239 |
} while_each_thread(first, tsk); |
6f44993fe [PATCH] per-task-... |
240 |
|
a98b60942 [PATCH] taskstats... |
241 242 243 244 245 246 |
unlock_task_sighand(first, &flags); rc = 0; out: rcu_read_unlock(); stats->version = TASKSTATS_VERSION; |
c757249af [PATCH] per-task-... |
247 |
/* |
3a4fa0a25 Fix misspellings ... |
248 |
* Accounting subsystems can also add calls here to modify |
ad4ecbcba [PATCH] delay acc... |
249 |
* fields of taskstats. |
c757249af [PATCH] per-task-... |
250 |
*/ |
a98b60942 [PATCH] taskstats... |
251 |
return rc; |
ad4ecbcba [PATCH] delay acc... |
252 253 254 255 256 257 |
} static void fill_tgid_exit(struct task_struct *tsk) { unsigned long flags; |
b8534d7bd [PATCH] taskstats... |
258 |
spin_lock_irqsave(&tsk->sighand->siglock, flags); |
ad4ecbcba [PATCH] delay acc... |
259 260 261 262 263 264 265 266 267 268 269 |
if (!tsk->signal->stats) goto ret; /* * Each accounting subsystem calls its functions here to * accumalate its per-task stats for tsk, into the per-tgid structure * * per-task-foo(tsk->signal->stats, tsk); */ delayacct_add_tsk(tsk->signal->stats, tsk); ret: |
b8534d7bd [PATCH] taskstats... |
270 |
spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
ad4ecbcba [PATCH] delay acc... |
271 |
return; |
c757249af [PATCH] per-task-... |
272 |
} |
41c7bb958 cpumask: convert ... |
273 |
static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd) |
f9fd8914c [PATCH] per-task ... |
274 275 276 277 |
{ struct listener_list *listeners; struct listener *s, *tmp; unsigned int cpu; |
ad4ecbcba [PATCH] delay acc... |
278 |
|
41c7bb958 cpumask: convert ... |
279 |
if (!cpumask_subset(mask, cpu_possible_mask)) |
f9fd8914c [PATCH] per-task ... |
280 281 282 |
return -EINVAL; if (isadd == REGISTER) { |
41c7bb958 cpumask: convert ... |
283 |
for_each_cpu(cpu, mask) { |
f9fd8914c [PATCH] per-task ... |
284 285 286 287 288 289 |
s = kmalloc_node(sizeof(struct listener), GFP_KERNEL, cpu_to_node(cpu)); if (!s) goto cleanup; s->pid = pid; INIT_LIST_HEAD(&s->list); |
bb129994c [PATCH] Remove do... |
290 |
s->valid = 1; |
f9fd8914c [PATCH] per-task ... |
291 292 293 294 295 296 297 298 299 300 301 |
listeners = &per_cpu(listener_array, cpu); down_write(&listeners->sem); list_add(&s->list, &listeners->list); up_write(&listeners->sem); } return 0; } /* Deregister or cleanup */ cleanup: |
41c7bb958 cpumask: convert ... |
302 |
for_each_cpu(cpu, mask) { |
f9fd8914c [PATCH] per-task ... |
303 304 305 306 307 308 309 310 311 312 313 314 315 |
listeners = &per_cpu(listener_array, cpu); down_write(&listeners->sem); list_for_each_entry_safe(s, tmp, &listeners->list, list) { if (s->pid == pid) { list_del(&s->list); kfree(s); break; } } up_write(&listeners->sem); } return 0; } |
41c7bb958 cpumask: convert ... |
316 |
static int parse(struct nlattr *na, struct cpumask *mask) |
f9fd8914c [PATCH] per-task ... |
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 |
{ char *data; int len; int ret; if (na == NULL) return 1; len = nla_len(na); if (len > TASKSTATS_CPUMASK_MAXLEN) return -E2BIG; if (len < 1) return -EINVAL; data = kmalloc(len, GFP_KERNEL); if (!data) return -ENOMEM; nla_strlcpy(data, na, len); |
29c0177e6 cpumask: change c... |
333 |
ret = cpulist_parse(data, mask); |
f9fd8914c [PATCH] per-task ... |
334 335 336 |
kfree(data); return ret; } |
51de4d908 [PATCH] taskstats... |
337 |
static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid) |
68062b86f [PATCH] taskstats... |
338 |
{ |
51de4d908 [PATCH] taskstats... |
339 |
struct nlattr *na, *ret; |
68062b86f [PATCH] taskstats... |
340 |
int aggr; |
371674853 [PATCH] taskstats... |
341 342 343 |
aggr = (type == TASKSTATS_TYPE_PID) ? TASKSTATS_TYPE_AGGR_PID : TASKSTATS_TYPE_AGGR_TGID; |
68062b86f [PATCH] taskstats... |
344 345 |
na = nla_nest_start(skb, aggr); |
371674853 [PATCH] taskstats... |
346 347 |
if (!na) goto err; |
51de4d908 [PATCH] taskstats... |
348 349 350 351 352 |
if (nla_put(skb, type, sizeof(pid), &pid) < 0) goto err; ret = nla_reserve(skb, TASKSTATS_TYPE_STATS, sizeof(struct taskstats)); if (!ret) goto err; |
68062b86f [PATCH] taskstats... |
353 |
nla_nest_end(skb, na); |
51de4d908 [PATCH] taskstats... |
354 355 356 |
return nla_data(ret); err: return NULL; |
68062b86f [PATCH] taskstats... |
357 |
} |
846c7bb05 Add cgroupstats |
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 |
static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info) { int rc = 0; struct sk_buff *rep_skb; struct cgroupstats *stats; struct nlattr *na; size_t size; u32 fd; struct file *file; int fput_needed; na = info->attrs[CGROUPSTATS_CMD_ATTR_FD]; if (!na) return -EINVAL; fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]); file = fget_light(fd, &fput_needed); |
f96159840 kernel/taskstats.... |
375 376 |
if (!file) return 0; |
846c7bb05 Add cgroupstats |
377 |
|
f96159840 kernel/taskstats.... |
378 |
size = nla_total_size(sizeof(struct cgroupstats)); |
846c7bb05 Add cgroupstats |
379 |
|
f96159840 kernel/taskstats.... |
380 381 382 383 |
rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb, size); if (rc < 0) goto err; |
846c7bb05 Add cgroupstats |
384 |
|
f96159840 kernel/taskstats.... |
385 386 387 388 |
na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS, sizeof(struct cgroupstats)); stats = nla_data(na); memset(stats, 0, sizeof(*stats)); |
846c7bb05 Add cgroupstats |
389 |
|
f96159840 kernel/taskstats.... |
390 391 392 393 |
rc = cgroupstats_build(stats, file->f_dentry); if (rc < 0) { nlmsg_free(rep_skb); goto err; |
846c7bb05 Add cgroupstats |
394 |
} |
134e63756 genetlink: make n... |
395 |
rc = send_reply(rep_skb, info); |
f96159840 kernel/taskstats.... |
396 |
|
846c7bb05 Add cgroupstats |
397 |
err: |
f96159840 kernel/taskstats.... |
398 |
fput_light(file, fput_needed); |
846c7bb05 Add cgroupstats |
399 400 |
return rc; } |
f9fd8914c [PATCH] per-task ... |
401 |
static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
c757249af [PATCH] per-task-... |
402 |
{ |
41c7bb958 cpumask: convert ... |
403 |
int rc; |
c757249af [PATCH] per-task-... |
404 |
struct sk_buff *rep_skb; |
51de4d908 [PATCH] taskstats... |
405 |
struct taskstats *stats; |
c757249af [PATCH] per-task-... |
406 |
size_t size; |
41c7bb958 cpumask: convert ... |
407 408 409 410 |
cpumask_var_t mask; if (!alloc_cpumask_var(&mask, GFP_KERNEL)) return -ENOMEM; |
f9fd8914c [PATCH] per-task ... |
411 |
|
41c7bb958 cpumask: convert ... |
412 |
rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask); |
f9fd8914c [PATCH] per-task ... |
413 |
if (rc < 0) |
41c7bb958 cpumask: convert ... |
414 415 416 417 418 |
goto free_return_rc; if (rc == 0) { rc = add_del_listener(info->snd_pid, mask, REGISTER); goto free_return_rc; } |
f9fd8914c [PATCH] per-task ... |
419 |
|
41c7bb958 cpumask: convert ... |
420 |
rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask); |
f9fd8914c [PATCH] per-task ... |
421 |
if (rc < 0) |
41c7bb958 cpumask: convert ... |
422 423 424 425 426 |
goto free_return_rc; if (rc == 0) { rc = add_del_listener(info->snd_pid, mask, DEREGISTER); free_return_rc: free_cpumask_var(mask); |
f9fd8914c [PATCH] per-task ... |
427 |
return rc; |
41c7bb958 cpumask: convert ... |
428 429 |
} free_cpumask_var(mask); |
c757249af [PATCH] per-task-... |
430 431 432 433 434 435 |
/* * Size includes space for nested attributes */ size = nla_total_size(sizeof(u32)) + nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
371674853 [PATCH] taskstats... |
436 |
rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
c757249af [PATCH] per-task-... |
437 438 |
if (rc < 0) return rc; |
51de4d908 [PATCH] taskstats... |
439 |
rc = -EINVAL; |
c757249af [PATCH] per-task-... |
440 441 |
if (info->attrs[TASKSTATS_CMD_ATTR_PID]) { u32 pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); |
51de4d908 [PATCH] taskstats... |
442 443 |
stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid); if (!stats) |
371674853 [PATCH] taskstats... |
444 |
goto err; |
c757249af [PATCH] per-task-... |
445 |
|
51de4d908 [PATCH] taskstats... |
446 447 |
rc = fill_pid(pid, NULL, stats); if (rc < 0) |
371674853 [PATCH] taskstats... |
448 |
goto err; |
c757249af [PATCH] per-task-... |
449 450 |
} else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) { u32 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); |
51de4d908 [PATCH] taskstats... |
451 452 |
stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid); if (!stats) |
371674853 [PATCH] taskstats... |
453 |
goto err; |
c757249af [PATCH] per-task-... |
454 |
|
51de4d908 [PATCH] taskstats... |
455 456 |
rc = fill_tgid(tgid, NULL, stats); if (rc < 0) |
371674853 [PATCH] taskstats... |
457 |
goto err; |
51de4d908 [PATCH] taskstats... |
458 |
} else |
c757249af [PATCH] per-task-... |
459 |
goto err; |
c757249af [PATCH] per-task-... |
460 |
|
134e63756 genetlink: make n... |
461 |
return send_reply(rep_skb, info); |
c757249af [PATCH] per-task-... |
462 463 464 465 |
err: nlmsg_free(rep_skb); return rc; } |
34ec12349 [PATCH] taskstats... |
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 |
static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk) { struct signal_struct *sig = tsk->signal; struct taskstats *stats; if (sig->stats || thread_group_empty(tsk)) goto ret; /* No problem if kmem_cache_zalloc() fails */ stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); spin_lock_irq(&tsk->sighand->siglock); if (!sig->stats) { sig->stats = stats; stats = NULL; } spin_unlock_irq(&tsk->sighand->siglock); if (stats) kmem_cache_free(taskstats_cache, stats); ret: return sig->stats; } |
c757249af [PATCH] per-task-... |
489 |
/* Send pid data out on exit */ |
115085ea0 [PATCH] taskstats... |
490 |
void taskstats_exit(struct task_struct *tsk, int group_dead) |
c757249af [PATCH] per-task-... |
491 492 |
{ int rc; |
115085ea0 [PATCH] taskstats... |
493 |
struct listener_list *listeners; |
51de4d908 [PATCH] taskstats... |
494 |
struct taskstats *stats; |
c757249af [PATCH] per-task-... |
495 |
struct sk_buff *rep_skb; |
c757249af [PATCH] per-task-... |
496 497 |
size_t size; int is_thread_group; |
c757249af [PATCH] per-task-... |
498 |
|
4a279ff1e [PATCH] taskstats... |
499 |
if (!family_registered) |
c757249af [PATCH] per-task-... |
500 |
return; |
c757249af [PATCH] per-task-... |
501 502 503 504 505 |
/* * Size includes space for nested attributes */ size = nla_total_size(sizeof(u32)) + nla_total_size(sizeof(struct taskstats)) + nla_total_size(0); |
34ec12349 [PATCH] taskstats... |
506 |
is_thread_group = !!taskstats_tgid_alloc(tsk); |
4a279ff1e [PATCH] taskstats... |
507 508 509 510 511 512 |
if (is_thread_group) { /* PID + STATS + TGID + STATS */ size = 2 * size; /* fill the tsk->signal->stats structure */ fill_tgid_exit(tsk); } |
115085ea0 [PATCH] taskstats... |
513 514 515 |
listeners = &__raw_get_cpu_var(listener_array); if (list_empty(&listeners->list)) return; |
371674853 [PATCH] taskstats... |
516 |
rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size); |
c757249af [PATCH] per-task-... |
517 |
if (rc < 0) |
51de4d908 [PATCH] taskstats... |
518 |
return; |
c757249af [PATCH] per-task-... |
519 |
|
51de4d908 [PATCH] taskstats... |
520 521 |
stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, tsk->pid); if (!stats) |
371674853 [PATCH] taskstats... |
522 |
goto err; |
c757249af [PATCH] per-task-... |
523 |
|
cb41d6d06 Use find_task_by_... |
524 |
rc = fill_pid(-1, tsk, stats); |
51de4d908 [PATCH] taskstats... |
525 |
if (rc < 0) |
371674853 [PATCH] taskstats... |
526 |
goto err; |
c757249af [PATCH] per-task-... |
527 |
|
c757249af [PATCH] per-task-... |
528 |
/* |
ad4ecbcba [PATCH] delay acc... |
529 |
* Doesn't matter if tsk is the leader or the last group member leaving |
c757249af [PATCH] per-task-... |
530 |
*/ |
68062b86f [PATCH] taskstats... |
531 |
if (!is_thread_group || !group_dead) |
ad4ecbcba [PATCH] delay acc... |
532 |
goto send; |
c757249af [PATCH] per-task-... |
533 |
|
51de4d908 [PATCH] taskstats... |
534 535 |
stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tsk->tgid); if (!stats) |
371674853 [PATCH] taskstats... |
536 |
goto err; |
51de4d908 [PATCH] taskstats... |
537 538 |
memcpy(stats, tsk->signal->stats, sizeof(*stats)); |
c757249af [PATCH] per-task-... |
539 |
|
ad4ecbcba [PATCH] delay acc... |
540 |
send: |
115085ea0 [PATCH] taskstats... |
541 |
send_cpu_listeners(rep_skb, listeners); |
ad4ecbcba [PATCH] delay acc... |
542 |
return; |
371674853 [PATCH] taskstats... |
543 |
err: |
c757249af [PATCH] per-task-... |
544 |
nlmsg_free(rep_skb); |
c757249af [PATCH] per-task-... |
545 546 547 548 |
} static struct genl_ops taskstats_ops = { .cmd = TASKSTATS_CMD_GET, |
f9fd8914c [PATCH] per-task ... |
549 |
.doit = taskstats_user_cmd, |
c757249af [PATCH] per-task-... |
550 551 |
.policy = taskstats_cmd_get_policy, }; |
846c7bb05 Add cgroupstats |
552 553 554 555 556 |
static struct genl_ops cgroupstats_ops = { .cmd = CGROUPSTATS_CMD_GET, .doit = cgroupstats_user_cmd, .policy = cgroupstats_cmd_get_policy, }; |
c757249af [PATCH] per-task-... |
557 558 559 |
/* Needed early in initialization */ void __init taskstats_init_early(void) { |
f9fd8914c [PATCH] per-task ... |
560 |
unsigned int i; |
0a31bd5f2 KMEM_CACHE(): sim... |
561 |
taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC); |
f9fd8914c [PATCH] per-task ... |
562 563 564 565 |
for_each_possible_cpu(i) { INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); init_rwsem(&(per_cpu(listener_array, i).sem)); } |
c757249af [PATCH] per-task-... |
566 567 568 569 570 571 572 573 574 575 576 577 578 |
} static int __init taskstats_init(void) { int rc; rc = genl_register_family(&family); if (rc) return rc; rc = genl_register_ops(&family, &taskstats_ops); if (rc < 0) goto err; |
846c7bb05 Add cgroupstats |
579 580 581 |
rc = genl_register_ops(&family, &cgroupstats_ops); if (rc < 0) goto err_cgroup_ops; |
c757249af [PATCH] per-task-... |
582 |
family_registered = 1; |
846c7bb05 Add cgroupstats |
583 584 |
printk("registered taskstats version %d ", TASKSTATS_GENL_VERSION); |
c757249af [PATCH] per-task-... |
585 |
return 0; |
846c7bb05 Add cgroupstats |
586 587 |
err_cgroup_ops: genl_unregister_ops(&family, &taskstats_ops); |
c757249af [PATCH] per-task-... |
588 589 590 591 592 593 594 595 596 597 |
err: genl_unregister_family(&family); return rc; } /* * late initcall ensures initialization of statistics collection * mechanisms precedes initialization of the taskstats interface */ late_initcall(taskstats_init); |