blob: 4e62a4a8fa9168225c2756512fdaaa51670b49f4 [file] [log] [blame]
Shailabh Nagarc7572492006-07-14 00:24:40 -07001/*
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>
Jay Lanf3cef7a2006-09-30 23:28:55 -070021#include <linux/tsacct_kern.h>
Shailabh Nagar6f449932006-07-14 00:24:41 -070022#include <linux/delayacct.h>
Shailabh Nagarf9fd8912006-07-14 00:24:47 -070023#include <linux/cpumask.h>
24#include <linux/percpu.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Balbir Singh846c7bb2007-10-18 23:39:44 -070026#include <linux/cgroupstats.h>
27#include <linux/cgroup.h>
28#include <linux/fs.h>
29#include <linux/file.h>
Eric W. Biederman4bd6e322012-02-07 17:56:49 -080030#include <linux/pid_namespace.h>
Shailabh Nagarc7572492006-07-14 00:24:40 -070031#include <net/genetlink.h>
Arun Sharma600634972011-07-26 16:09:06 -070032#include <linux/atomic.h>
Zhang Xiao8c733422017-05-08 15:56:45 -070033#include <linux/sched/cputime.h>
Shailabh Nagarc7572492006-07-14 00:24:40 -070034
Shailabh Nagarf9fd8912006-07-14 00:24:47 -070035/*
36 * Maximum length of a cpumask that can be specified in
37 * the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute
38 */
39#define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS)
40
Vegard Nossumb81f3ea2008-07-25 01:48:55 -070041static DEFINE_PER_CPU(__u32, taskstats_seqnum);
Shailabh Nagarc7572492006-07-14 00:24:40 -070042static int family_registered;
Christoph Lametere18b8902006-12-06 20:33:20 -080043struct kmem_cache *taskstats_cache;
Shailabh Nagarc7572492006-07-14 00:24:40 -070044
Johannes Berg489111e2016-10-24 14:40:03 +020045static struct genl_family family;
Shailabh Nagarc7572492006-07-14 00:24:40 -070046
Alexey Dobriyanb54452b2010-02-18 08:14:31 +000047static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
Shailabh Nagarc7572492006-07-14 00:24:40 -070048 [TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 },
49 [TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 },
Shailabh Nagarf9fd8912006-07-14 00:24:47 -070050 [TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING },
51 [TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },};
52
WANG Cong243d5212016-11-03 09:42:36 -070053/*
54 * We have to use TASKSTATS_CMD_ATTR_MAX here, it is the maxattr in the family.
55 * Make sure they are always aligned.
56 */
57static const struct nla_policy cgroupstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
Balbir Singh846c7bb2007-10-18 23:39:44 -070058 [CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 },
59};
60
Shailabh Nagarf9fd8912006-07-14 00:24:47 -070061struct listener {
62 struct list_head list;
63 pid_t pid;
Shailabh Nagarbb129992006-07-14 00:24:47 -070064 char valid;
Shailabh Nagarc7572492006-07-14 00:24:40 -070065};
66
Shailabh Nagarf9fd8912006-07-14 00:24:47 -070067struct listener_list {
68 struct rw_semaphore sem;
69 struct list_head list;
70};
71static DEFINE_PER_CPU(struct listener_list, listener_array);
72
73enum actions {
74 REGISTER,
75 DEREGISTER,
76 CPU_DONT_CARE
77};
Shailabh Nagarc7572492006-07-14 00:24:40 -070078
79static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
Oleg Nesterov371674852006-12-06 20:36:55 -080080 size_t size)
Shailabh Nagarc7572492006-07-14 00:24:40 -070081{
82 struct sk_buff *skb;
83 void *reply;
84
85 /*
86 * If new attributes are added, please revisit this allocation
87 */
Thomas Graf3dabc712006-11-14 19:44:52 -080088 skb = genlmsg_new(size, GFP_KERNEL);
Shailabh Nagarc7572492006-07-14 00:24:40 -070089 if (!skb)
90 return -ENOMEM;
91
92 if (!info) {
Christoph Lametercd85fc52010-12-08 17:42:22 +010093 int seq = this_cpu_inc_return(taskstats_seqnum) - 1;
Shailabh Nagarc7572492006-07-14 00:24:40 -070094
Thomas Graf17c157c2006-11-14 19:46:02 -080095 reply = genlmsg_put(skb, 0, seq, &family, 0, cmd);
Shailabh Nagarc7572492006-07-14 00:24:40 -070096 } else
Thomas Graf17c157c2006-11-14 19:46:02 -080097 reply = genlmsg_put_reply(skb, info, &family, 0, cmd);
Shailabh Nagarc7572492006-07-14 00:24:40 -070098 if (reply == NULL) {
99 nlmsg_free(skb);
100 return -EINVAL;
101 }
102
103 *skbp = skb;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700104 return 0;
105}
106
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700107/*
108 * Send taskstats data in @skb to listener with nl_pid @pid
109 */
Johannes Berg134e6372009-07-10 09:51:34 +0000110static int send_reply(struct sk_buff *skb, struct genl_info *info)
Shailabh Nagarc7572492006-07-14 00:24:40 -0700111{
Arnaldo Carvalho de Melob529ccf2007-04-25 19:08:35 -0700112 struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700113 void *reply = genlmsg_data(genlhdr);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700114
Johannes Berg053c0952015-01-16 22:09:00 +0100115 genlmsg_end(skb, reply);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700116
Johannes Berg134e6372009-07-10 09:51:34 +0000117 return genlmsg_reply(skb, info);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700118}
119
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700120/*
121 * Send taskstats data in @skb to listeners registered for @cpu's exit data
122 */
Oleg Nesterov115085e2006-12-06 20:36:51 -0800123static void send_cpu_listeners(struct sk_buff *skb,
124 struct listener_list *listeners)
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700125{
Arnaldo Carvalho de Melob529ccf2007-04-25 19:08:35 -0700126 struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700127 struct listener *s, *tmp;
128 struct sk_buff *skb_next, *skb_cur = skb;
129 void *reply = genlmsg_data(genlhdr);
Shailabh Nagard94a0412006-07-30 03:03:11 -0700130 int rc, delcount = 0;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700131
Johannes Berg053c0952015-01-16 22:09:00 +0100132 genlmsg_end(skb, reply);
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700133
134 rc = 0;
Shailabh Nagarbb129992006-07-14 00:24:47 -0700135 down_read(&listeners->sem);
Shailabh Nagard94a0412006-07-30 03:03:11 -0700136 list_for_each_entry(s, &listeners->list, list) {
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700137 skb_next = NULL;
138 if (!list_is_last(&s->list, &listeners->list)) {
139 skb_next = skb_clone(skb_cur, GFP_KERNEL);
Shailabh Nagard94a0412006-07-30 03:03:11 -0700140 if (!skb_next)
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700141 break;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700142 }
Johannes Berg134e6372009-07-10 09:51:34 +0000143 rc = genlmsg_unicast(&init_net, skb_cur, s->pid);
Shailabh Nagard94a0412006-07-30 03:03:11 -0700144 if (rc == -ECONNREFUSED) {
Shailabh Nagarbb129992006-07-14 00:24:47 -0700145 s->valid = 0;
146 delcount++;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700147 }
148 skb_cur = skb_next;
149 }
Shailabh Nagarbb129992006-07-14 00:24:47 -0700150 up_read(&listeners->sem);
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700151
Shailabh Nagard94a0412006-07-30 03:03:11 -0700152 if (skb_cur)
153 nlmsg_free(skb_cur);
154
Shailabh Nagarbb129992006-07-14 00:24:47 -0700155 if (!delcount)
Shailabh Nagard94a0412006-07-30 03:03:11 -0700156 return;
Shailabh Nagarbb129992006-07-14 00:24:47 -0700157
158 /* Delete invalidated entries */
159 down_write(&listeners->sem);
160 list_for_each_entry_safe(s, tmp, &listeners->list, list) {
161 if (!s->valid) {
162 list_del(&s->list);
163 kfree(s);
164 }
165 }
166 up_write(&listeners->sem);
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700167}
168
Eric W. Biederman4bd6e322012-02-07 17:56:49 -0800169static void fill_stats(struct user_namespace *user_ns,
170 struct pid_namespace *pid_ns,
171 struct task_struct *tsk, struct taskstats *stats)
Shailabh Nagarc7572492006-07-14 00:24:40 -0700172{
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800173 memset(stats, 0, sizeof(*stats));
Shailabh Nagarc7572492006-07-14 00:24:40 -0700174 /*
175 * Each accounting subsystem adds calls to its functions to
176 * fill in relevant parts of struct taskstsats as follows
177 *
Shailabh Nagar7d94ddd2006-07-30 03:03:10 -0700178 * per-task-foo(stats, tsk);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700179 */
180
Shailabh Nagar7d94ddd2006-07-30 03:03:10 -0700181 delayacct_add_tsk(stats, tsk);
Jay Lanf3cef7a2006-09-30 23:28:55 -0700182
183 /* fill in basic acct fields */
Shailabh Nagar6f449932006-07-14 00:24:41 -0700184 stats->version = TASKSTATS_VERSION;
Maxim Uvarovb663a792007-07-15 23:40:48 -0700185 stats->nvcsw = tsk->nvcsw;
186 stats->nivcsw = tsk->nivcsw;
Eric W. Biederman4bd6e322012-02-07 17:56:49 -0800187 bacct_add_tsk(user_ns, pid_ns, stats, tsk);
Shailabh Nagar6f449932006-07-14 00:24:41 -0700188
Jay Lan9acc1852006-09-30 23:28:58 -0700189 /* fill in extended acct fields */
190 xacct_add_tsk(stats, tsk);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700191}
192
Michael Holzheu3d9e0cf2010-10-27 15:34:44 -0700193static int fill_stats_for_pid(pid_t pid, struct taskstats *stats)
Shailabh Nagarc7572492006-07-14 00:24:40 -0700194{
Oleg Nesterova98b6092006-10-28 10:38:54 -0700195 struct task_struct *tsk;
Michael Holzheu3d9e0cf2010-10-27 15:34:44 -0700196
Mike Rapoport2ee08262018-02-06 15:40:17 -0800197 tsk = find_get_task_by_vpid(pid);
Michael Holzheu3d9e0cf2010-10-27 15:34:44 -0700198 if (!tsk)
199 return -ESRCH;
Eric W. Biederman4bd6e322012-02-07 17:56:49 -0800200 fill_stats(current_user_ns(), task_active_pid_ns(current), tsk, stats);
Michael Holzheu3d9e0cf2010-10-27 15:34:44 -0700201 put_task_struct(tsk);
202 return 0;
203}
204
205static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats)
206{
207 struct task_struct *tsk, *first;
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700208 unsigned long flags;
Oleg Nesterova98b6092006-10-28 10:38:54 -0700209 int rc = -ESRCH;
Zhang Xiao8c733422017-05-08 15:56:45 -0700210 u64 delta, utime, stime;
211 u64 start_time;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700212
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700213 /*
214 * Add additional stats from live tasks except zombie thread group
215 * leaders who are already counted with the dead tasks
216 */
Oleg Nesterova98b6092006-10-28 10:38:54 -0700217 rcu_read_lock();
Michael Holzheu3d9e0cf2010-10-27 15:34:44 -0700218 first = find_task_by_vpid(tgid);
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700219
Oleg Nesterova98b6092006-10-28 10:38:54 -0700220 if (!first || !lock_task_sighand(first, &flags))
221 goto out;
222
223 if (first->signal->stats)
224 memcpy(stats, first->signal->stats, sizeof(*stats));
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800225 else
226 memset(stats, 0, sizeof(*stats));
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700227
Shailabh Nagarc7572492006-07-14 00:24:40 -0700228 tsk = first;
Zhang Xiao8c733422017-05-08 15:56:45 -0700229 start_time = ktime_get_ns();
Shailabh Nagarc7572492006-07-14 00:24:40 -0700230 do {
Oleg Nesterovd7c3f5f2006-10-28 10:38:54 -0700231 if (tsk->exit_state)
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700232 continue;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700233 /*
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700234 * Accounting subsystem can call its functions here to
Shailabh Nagarc7572492006-07-14 00:24:40 -0700235 * fill in relevant parts of struct taskstsats as follows
236 *
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700237 * per-task-foo(stats, tsk);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700238 */
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700239 delayacct_add_tsk(stats, tsk);
Shailabh Nagar6f449932006-07-14 00:24:41 -0700240
Zhang Xiao8c733422017-05-08 15:56:45 -0700241 /* calculate task elapsed time in nsec */
242 delta = start_time - tsk->start_time;
243 /* Convert to micro seconds */
244 do_div(delta, NSEC_PER_USEC);
245 stats->ac_etime += delta;
246
247 task_cputime(tsk, &utime, &stime);
248 stats->ac_utime += div_u64(utime, NSEC_PER_USEC);
249 stats->ac_stime += div_u64(stime, NSEC_PER_USEC);
250
Maxim Uvarovb663a792007-07-15 23:40:48 -0700251 stats->nvcsw += tsk->nvcsw;
252 stats->nivcsw += tsk->nivcsw;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700253 } while_each_thread(first, tsk);
Shailabh Nagar6f449932006-07-14 00:24:41 -0700254
Oleg Nesterova98b6092006-10-28 10:38:54 -0700255 unlock_task_sighand(first, &flags);
256 rc = 0;
257out:
258 rcu_read_unlock();
259
260 stats->version = TASKSTATS_VERSION;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700261 /*
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200262 * Accounting subsystems can also add calls here to modify
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700263 * fields of taskstats.
Shailabh Nagarc7572492006-07-14 00:24:40 -0700264 */
Oleg Nesterova98b6092006-10-28 10:38:54 -0700265 return rc;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700266}
267
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700268static void fill_tgid_exit(struct task_struct *tsk)
269{
270 unsigned long flags;
271
Oleg Nesterovb8534d72006-10-28 10:38:53 -0700272 spin_lock_irqsave(&tsk->sighand->siglock, flags);
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700273 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);
283ret:
Oleg Nesterovb8534d72006-10-28 10:38:53 -0700284 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700285 return;
286}
287
Rusty Russell41c7bb92009-01-01 10:12:28 +1030288static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd)
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700289{
290 struct listener_list *listeners;
Vasiliy Kulikov26c4cae2011-06-27 16:18:11 -0700291 struct listener *s, *tmp, *s2;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700292 unsigned int cpu;
Chen Gang0d206332013-11-12 15:11:23 -0800293 int ret = 0;
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700294
Rusty Russell41c7bb92009-01-01 10:12:28 +1030295 if (!cpumask_subset(mask, cpu_possible_mask))
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700296 return -EINVAL;
297
Eric W. Biederman4bd6e322012-02-07 17:56:49 -0800298 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
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700304 if (isadd == REGISTER) {
Rusty Russell41c7bb92009-01-01 10:12:28 +1030305 for_each_cpu(cpu, mask) {
Oleg Nesterovdfc428b2011-08-03 16:21:04 -0700306 s = kmalloc_node(sizeof(struct listener),
307 GFP_KERNEL, cpu_to_node(cpu));
Chen Gang0d206332013-11-12 15:11:23 -0800308 if (!s) {
309 ret = -ENOMEM;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700310 goto cleanup;
Chen Gang0d206332013-11-12 15:11:23 -0800311 }
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700312 s->pid = pid;
Shailabh Nagarbb129992006-07-14 00:24:47 -0700313 s->valid = 1;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700314
315 listeners = &per_cpu(listener_array, cpu);
316 down_write(&listeners->sem);
Oleg Nesterovdfc428b2011-08-03 16:21:04 -0700317 list_for_each_entry(s2, &listeners->list, list) {
Oleg Nesterova7295892011-08-03 16:21:05 -0700318 if (s2->pid == pid && s2->valid)
Oleg Nesterovdfc428b2011-08-03 16:21:04 -0700319 goto exists;
Vasiliy Kulikov26c4cae2011-06-27 16:18:11 -0700320 }
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700321 list_add(&s->list, &listeners->list);
Vasiliy Kulikov26c4cae2011-06-27 16:18:11 -0700322 s = NULL;
Oleg Nesterovdfc428b2011-08-03 16:21:04 -0700323exists:
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700324 up_write(&listeners->sem);
Oleg Nesterovdfc428b2011-08-03 16:21:04 -0700325 kfree(s); /* nop if NULL */
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700326 }
327 return 0;
328 }
329
330 /* Deregister or cleanup */
331cleanup:
Rusty Russell41c7bb92009-01-01 10:12:28 +1030332 for_each_cpu(cpu, mask) {
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700333 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 }
Chen Gang0d206332013-11-12 15:11:23 -0800344 return ret;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700345}
346
Rusty Russell41c7bb92009-01-01 10:12:28 +1030347static int parse(struct nlattr *na, struct cpumask *mask)
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700348{
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);
Rusty Russell29c01772008-12-13 21:20:25 +1030364 ret = cpulist_parse(data, mask);
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700365 kfree(data);
366 return ret;
367}
368
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800369static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid)
Oleg Nesterov68062b82006-12-06 20:36:53 -0800370{
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800371 struct nlattr *na, *ret;
Oleg Nesterov68062b82006-12-06 20:36:53 -0800372 int aggr;
373
Oleg Nesterov371674852006-12-06 20:36:55 -0800374 aggr = (type == TASKSTATS_TYPE_PID)
375 ? TASKSTATS_TYPE_AGGR_PID
376 : TASKSTATS_TYPE_AGGR_TGID;
Oleg Nesterov68062b82006-12-06 20:36:53 -0800377
378 na = nla_nest_start(skb, aggr);
Oleg Nesterov371674852006-12-06 20:36:55 -0800379 if (!na)
380 goto err;
Jeff Mahoney4be2c952010-12-21 17:24:30 -0800381
Chen Gang3fa58262013-11-12 15:11:22 -0800382 if (nla_put(skb, type, sizeof(pid), &pid) < 0) {
383 nla_nest_cancel(skb, na);
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800384 goto err;
Chen Gang3fa58262013-11-12 15:11:22 -0800385 }
Nicolas Dichtel80df5542016-04-22 17:31:24 +0200386 ret = nla_reserve_64bit(skb, TASKSTATS_TYPE_STATS,
387 sizeof(struct taskstats), TASKSTATS_TYPE_NULL);
Chen Gang3fa58262013-11-12 15:11:22 -0800388 if (!ret) {
389 nla_nest_cancel(skb, na);
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800390 goto err;
Chen Gang3fa58262013-11-12 15:11:22 -0800391 }
Oleg Nesterov68062b82006-12-06 20:36:53 -0800392 nla_nest_end(skb, na);
393
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800394 return nla_data(ret);
395err:
396 return NULL;
Oleg Nesterov68062b82006-12-06 20:36:53 -0800397}
398
Balbir Singh846c7bb2007-10-18 23:39:44 -0700399static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
400{
401 int rc = 0;
402 struct sk_buff *rep_skb;
403 struct cgroupstats *stats;
404 struct nlattr *na;
405 size_t size;
406 u32 fd;
Al Viro2903ff02012-08-28 12:52:22 -0400407 struct fd f;
Balbir Singh846c7bb2007-10-18 23:39:44 -0700408
409 na = info->attrs[CGROUPSTATS_CMD_ATTR_FD];
410 if (!na)
411 return -EINVAL;
412
413 fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]);
Al Viro2903ff02012-08-28 12:52:22 -0400414 f = fdget(fd);
415 if (!f.file)
Adrian Bunkf9615982007-11-14 17:00:37 -0800416 return 0;
Balbir Singh846c7bb2007-10-18 23:39:44 -0700417
Adrian Bunkf9615982007-11-14 17:00:37 -0800418 size = nla_total_size(sizeof(struct cgroupstats));
Balbir Singh846c7bb2007-10-18 23:39:44 -0700419
Adrian Bunkf9615982007-11-14 17:00:37 -0800420 rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb,
421 size);
422 if (rc < 0)
423 goto err;
Balbir Singh846c7bb2007-10-18 23:39:44 -0700424
Adrian Bunkf9615982007-11-14 17:00:37 -0800425 na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS,
426 sizeof(struct cgroupstats));
Alan Cox25353b32012-07-30 14:42:49 -0700427 if (na == NULL) {
Jesper Juhl0324b5a2012-10-04 17:16:52 -0700428 nlmsg_free(rep_skb);
Alan Cox25353b32012-07-30 14:42:49 -0700429 rc = -EMSGSIZE;
430 goto err;
431 }
432
Adrian Bunkf9615982007-11-14 17:00:37 -0800433 stats = nla_data(na);
434 memset(stats, 0, sizeof(*stats));
Balbir Singh846c7bb2007-10-18 23:39:44 -0700435
Al Virob5830432014-10-31 01:22:04 -0400436 rc = cgroupstats_build(stats, f.file->f_path.dentry);
Adrian Bunkf9615982007-11-14 17:00:37 -0800437 if (rc < 0) {
438 nlmsg_free(rep_skb);
439 goto err;
Balbir Singh846c7bb2007-10-18 23:39:44 -0700440 }
441
Johannes Berg134e6372009-07-10 09:51:34 +0000442 rc = send_reply(rep_skb, info);
Adrian Bunkf9615982007-11-14 17:00:37 -0800443
Balbir Singh846c7bb2007-10-18 23:39:44 -0700444err:
Al Viro2903ff02012-08-28 12:52:22 -0400445 fdput(f);
Balbir Singh846c7bb2007-10-18 23:39:44 -0700446 return rc;
447}
448
Michael Holzheu93233122010-10-27 15:34:44 -0700449static int cmd_attr_register_cpumask(struct genl_info *info)
Shailabh Nagarc7572492006-07-14 00:24:40 -0700450{
Rusty Russell41c7bb92009-01-01 10:12:28 +1030451 cpumask_var_t mask;
Michael Holzheu93233122010-10-27 15:34:44 -0700452 int rc;
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700453
Rusty Russell41c7bb92009-01-01 10:12:28 +1030454 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
455 return -ENOMEM;
Rusty Russell41c7bb92009-01-01 10:12:28 +1030456 rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask);
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700457 if (rc < 0)
Michael Holzheu93233122010-10-27 15:34:44 -0700458 goto out;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000459 rc = add_del_listener(info->snd_portid, mask, REGISTER);
Michael Holzheu93233122010-10-27 15:34:44 -0700460out:
461 free_cpumask_var(mask);
462 return rc;
463}
Rusty Russell41c7bb92009-01-01 10:12:28 +1030464
Michael Holzheu93233122010-10-27 15:34:44 -0700465static int cmd_attr_deregister_cpumask(struct genl_info *info)
466{
467 cpumask_var_t mask;
468 int rc;
469
470 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
471 return -ENOMEM;
Rusty Russell41c7bb92009-01-01 10:12:28 +1030472 rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask);
473 if (rc < 0)
Michael Holzheu93233122010-10-27 15:34:44 -0700474 goto out;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000475 rc = add_del_listener(info->snd_portid, mask, DEREGISTER);
Michael Holzheu93233122010-10-27 15:34:44 -0700476out:
Rusty Russell41c7bb92009-01-01 10:12:28 +1030477 free_cpumask_var(mask);
Michael Holzheu93233122010-10-27 15:34:44 -0700478 return rc;
479}
Shailabh Nagarc7572492006-07-14 00:24:40 -0700480
Jeff Mahoney4be2c952010-12-21 17:24:30 -0800481static size_t taskstats_packet_size(void)
482{
483 size_t size;
484
485 size = nla_total_size(sizeof(u32)) +
Nicolas Dichtel80df5542016-04-22 17:31:24 +0200486 nla_total_size_64bit(sizeof(struct taskstats)) +
487 nla_total_size(0);
488
Jeff Mahoney4be2c952010-12-21 17:24:30 -0800489 return size;
490}
491
Michael Holzheu93233122010-10-27 15:34:44 -0700492static int cmd_attr_pid(struct genl_info *info)
493{
494 struct taskstats *stats;
495 struct sk_buff *rep_skb;
496 size_t size;
497 u32 pid;
498 int rc;
499
Jeff Mahoney4be2c952010-12-21 17:24:30 -0800500 size = taskstats_packet_size();
Shailabh Nagarc7572492006-07-14 00:24:40 -0700501
Oleg Nesterov371674852006-12-06 20:36:55 -0800502 rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700503 if (rc < 0)
504 return rc;
505
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800506 rc = -EINVAL;
Michael Holzheu93233122010-10-27 15:34:44 -0700507 pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]);
508 stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid);
509 if (!stats)
Shailabh Nagarc7572492006-07-14 00:24:40 -0700510 goto err;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700511
Michael Holzheu3d9e0cf2010-10-27 15:34:44 -0700512 rc = fill_stats_for_pid(pid, stats);
Michael Holzheu93233122010-10-27 15:34:44 -0700513 if (rc < 0)
514 goto err;
Johannes Berg134e6372009-07-10 09:51:34 +0000515 return send_reply(rep_skb, info);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700516err:
517 nlmsg_free(rep_skb);
518 return rc;
519}
520
Michael Holzheu93233122010-10-27 15:34:44 -0700521static int cmd_attr_tgid(struct genl_info *info)
522{
523 struct taskstats *stats;
524 struct sk_buff *rep_skb;
525 size_t size;
526 u32 tgid;
527 int rc;
528
Jeff Mahoney4be2c952010-12-21 17:24:30 -0800529 size = taskstats_packet_size();
Michael Holzheu93233122010-10-27 15:34:44 -0700530
531 rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
532 if (rc < 0)
533 return rc;
534
535 rc = -EINVAL;
536 tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]);
537 stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid);
538 if (!stats)
539 goto err;
540
Michael Holzheu3d9e0cf2010-10-27 15:34:44 -0700541 rc = fill_stats_for_tgid(tgid, stats);
Michael Holzheu93233122010-10-27 15:34:44 -0700542 if (rc < 0)
543 goto err;
544 return send_reply(rep_skb, info);
545err:
546 nlmsg_free(rep_skb);
547 return rc;
548}
549
550static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
551{
552 if (info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK])
553 return cmd_attr_register_cpumask(info);
554 else if (info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK])
555 return cmd_attr_deregister_cpumask(info);
556 else if (info->attrs[TASKSTATS_CMD_ATTR_PID])
557 return cmd_attr_pid(info);
558 else if (info->attrs[TASKSTATS_CMD_ATTR_TGID])
559 return cmd_attr_tgid(info);
560 else
561 return -EINVAL;
562}
563
Oleg Nesterov34ec12342006-12-06 20:36:52 -0800564static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk)
565{
566 struct signal_struct *sig = tsk->signal;
567 struct taskstats *stats;
568
569 if (sig->stats || thread_group_empty(tsk))
570 goto ret;
571
572 /* No problem if kmem_cache_zalloc() fails */
573 stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL);
574
575 spin_lock_irq(&tsk->sighand->siglock);
576 if (!sig->stats) {
577 sig->stats = stats;
578 stats = NULL;
579 }
580 spin_unlock_irq(&tsk->sighand->siglock);
581
582 if (stats)
583 kmem_cache_free(taskstats_cache, stats);
584ret:
585 return sig->stats;
586}
587
Shailabh Nagarc7572492006-07-14 00:24:40 -0700588/* Send pid data out on exit */
Oleg Nesterov115085e2006-12-06 20:36:51 -0800589void taskstats_exit(struct task_struct *tsk, int group_dead)
Shailabh Nagarc7572492006-07-14 00:24:40 -0700590{
591 int rc;
Oleg Nesterov115085e2006-12-06 20:36:51 -0800592 struct listener_list *listeners;
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800593 struct taskstats *stats;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700594 struct sk_buff *rep_skb;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700595 size_t size;
596 int is_thread_group;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700597
Oleg Nesterov4a279ff2006-10-30 22:07:15 -0800598 if (!family_registered)
Shailabh Nagarc7572492006-07-14 00:24:40 -0700599 return;
600
Shailabh Nagarc7572492006-07-14 00:24:40 -0700601 /*
602 * Size includes space for nested attributes
603 */
Jeff Mahoney4be2c952010-12-21 17:24:30 -0800604 size = taskstats_packet_size();
Shailabh Nagarc7572492006-07-14 00:24:40 -0700605
Oleg Nesterov34ec12342006-12-06 20:36:52 -0800606 is_thread_group = !!taskstats_tgid_alloc(tsk);
Oleg Nesterov4a279ff2006-10-30 22:07:15 -0800607 if (is_thread_group) {
608 /* PID + STATS + TGID + STATS */
609 size = 2 * size;
610 /* fill the tsk->signal->stats structure */
611 fill_tgid_exit(tsk);
612 }
613
Christoph Lameter4a32fea2014-08-17 12:30:27 -0500614 listeners = raw_cpu_ptr(&listener_array);
Oleg Nesterov115085e2006-12-06 20:36:51 -0800615 if (list_empty(&listeners->list))
616 return;
617
Oleg Nesterov371674852006-12-06 20:36:55 -0800618 rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700619 if (rc < 0)
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800620 return;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700621
Eric W. Biederman4bd6e322012-02-07 17:56:49 -0800622 stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID,
623 task_pid_nr_ns(tsk, &init_pid_ns));
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800624 if (!stats)
Oleg Nesterov371674852006-12-06 20:36:55 -0800625 goto err;
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800626
Eric W. Biederman4bd6e322012-02-07 17:56:49 -0800627 fill_stats(&init_user_ns, &init_pid_ns, tsk, stats);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700628
Shailabh Nagarc7572492006-07-14 00:24:40 -0700629 /*
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700630 * Doesn't matter if tsk is the leader or the last group member leaving
Shailabh Nagarc7572492006-07-14 00:24:40 -0700631 */
Oleg Nesterov68062b82006-12-06 20:36:53 -0800632 if (!is_thread_group || !group_dead)
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700633 goto send;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700634
Eric W. Biederman4bd6e322012-02-07 17:56:49 -0800635 stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID,
636 task_tgid_nr_ns(tsk, &init_pid_ns));
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800637 if (!stats)
Oleg Nesterov371674852006-12-06 20:36:55 -0800638 goto err;
Oleg Nesterov51de4d92006-12-06 20:36:54 -0800639
640 memcpy(stats, tsk->signal->stats, sizeof(*stats));
Shailabh Nagarc7572492006-07-14 00:24:40 -0700641
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700642send:
Oleg Nesterov115085e2006-12-06 20:36:51 -0800643 send_cpu_listeners(rep_skb, listeners);
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700644 return;
Oleg Nesterov371674852006-12-06 20:36:55 -0800645err:
Shailabh Nagarc7572492006-07-14 00:24:40 -0700646 nlmsg_free(rep_skb);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700647}
648
Johannes Berg4534de82013-11-14 17:14:46 +0100649static const struct genl_ops taskstats_ops[] = {
Johannes Berg88d36a92013-11-14 17:14:39 +0100650 {
651 .cmd = TASKSTATS_CMD_GET,
652 .doit = taskstats_user_cmd,
653 .policy = taskstats_cmd_get_policy,
654 .flags = GENL_ADMIN_PERM,
655 },
656 {
657 .cmd = CGROUPSTATS_CMD_GET,
658 .doit = cgroupstats_user_cmd,
659 .policy = cgroupstats_cmd_get_policy,
660 },
Balbir Singh846c7bb2007-10-18 23:39:44 -0700661};
662
Johannes Berg56989f62016-10-24 14:40:05 +0200663static struct genl_family family __ro_after_init = {
Johannes Berg489111e2016-10-24 14:40:03 +0200664 .name = TASKSTATS_GENL_NAME,
665 .version = TASKSTATS_GENL_VERSION,
666 .maxattr = TASKSTATS_CMD_ATTR_MAX,
667 .module = THIS_MODULE,
668 .ops = taskstats_ops,
669 .n_ops = ARRAY_SIZE(taskstats_ops),
670};
671
Shailabh Nagarc7572492006-07-14 00:24:40 -0700672/* Needed early in initialization */
673void __init taskstats_init_early(void)
674{
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700675 unsigned int i;
676
Christoph Lameter0a31bd52007-05-06 14:49:57 -0700677 taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC);
Shailabh Nagarf9fd8912006-07-14 00:24:47 -0700678 for_each_possible_cpu(i) {
679 INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
680 init_rwsem(&(per_cpu(listener_array, i).sem));
681 }
Shailabh Nagarc7572492006-07-14 00:24:40 -0700682}
683
684static int __init taskstats_init(void)
685{
686 int rc;
687
Johannes Berg489111e2016-10-24 14:40:03 +0200688 rc = genl_register_family(&family);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700689 if (rc)
690 return rc;
691
Shailabh Nagarc7572492006-07-14 00:24:40 -0700692 family_registered = 1;
Mandeep Singh Bainesf9b182e2011-03-23 16:43:27 -0700693 pr_info("registered taskstats version %d\n", TASKSTATS_GENL_VERSION);
Shailabh Nagarc7572492006-07-14 00:24:40 -0700694 return 0;
Shailabh Nagarc7572492006-07-14 00:24:40 -0700695}
696
697/*
698 * late initcall ensures initialization of statistics collection
699 * mechanisms precedes initialization of the taskstats interface
700 */
701late_initcall(taskstats_init);