1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* procacct.c |
3 | * |
4 | * Demonstrator of fetching resource data on task exit, as a way |
5 | * to accumulate accurate program resource usage statistics, without |
6 | * prior identification of the programs. For that, the fields for |
7 | * device and inode of the program executable binary file are also |
8 | * extracted in addition to the command string. |
9 | * |
10 | * The TGID together with the PID and the AGROUP flag allow |
11 | * identification of threads in a process and single-threaded processes. |
12 | * The ac_tgetime field gives proper whole-process walltime. |
13 | * |
14 | * Written (changed) by Thomas Orgis, University of Hamburg in 2022 |
15 | * |
16 | * This is a cheap derivation (inheriting the style) of getdelays.c: |
17 | * |
18 | * Utility to get per-pid and per-tgid delay accounting statistics |
19 | * Also illustrates usage of the taskstats interface |
20 | * |
21 | * Copyright (C) Shailabh Nagar, IBM Corp. 2005 |
22 | * Copyright (C) Balbir Singh, IBM Corp. 2006 |
23 | * Copyright (c) Jay Lan, SGI. 2006 |
24 | */ |
25 | |
26 | #include <stdio.h> |
27 | #include <stdlib.h> |
28 | #include <errno.h> |
29 | #include <unistd.h> |
30 | #include <poll.h> |
31 | #include <string.h> |
32 | #include <fcntl.h> |
33 | #include <sys/types.h> |
34 | #include <sys/stat.h> |
35 | #include <sys/socket.h> |
36 | #include <sys/wait.h> |
37 | #include <signal.h> |
38 | |
39 | #include <linux/genetlink.h> |
40 | #include <linux/acct.h> |
41 | #include <linux/taskstats.h> |
42 | #include <linux/kdev_t.h> |
43 | |
44 | /* |
45 | * Generic macros for dealing with netlink sockets. Might be duplicated |
46 | * elsewhere. It is recommended that commercial grade applications use |
47 | * libnl or libnetlink and use the interfaces provided by the library |
48 | */ |
49 | #define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN)) |
50 | #define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN) |
51 | #define NLA_DATA(na) ((void *)((char *)(na) + NLA_HDRLEN)) |
52 | #define NLA_PAYLOAD(len) (len - NLA_HDRLEN) |
53 | |
54 | #define err(code, fmt, arg...) \ |
55 | do { \ |
56 | fprintf(stderr, fmt, ##arg); \ |
57 | exit(code); \ |
58 | } while (0) |
59 | |
60 | int rcvbufsz; |
61 | char name[100]; |
62 | int dbg; |
63 | int print_delays; |
64 | int print_io_accounting; |
65 | int print_task_context_switch_counts; |
66 | |
67 | #define PRINTF(fmt, arg...) { \ |
68 | if (dbg) { \ |
69 | printf(fmt, ##arg); \ |
70 | } \ |
71 | } |
72 | |
73 | /* Maximum size of response requested or message sent */ |
74 | #define MAX_MSG_SIZE 1024 |
75 | /* Maximum number of cpus expected to be specified in a cpumask */ |
76 | #define MAX_CPUS 32 |
77 | |
78 | struct msgtemplate { |
79 | struct nlmsghdr n; |
80 | struct genlmsghdr g; |
81 | char buf[MAX_MSG_SIZE]; |
82 | }; |
83 | |
84 | char cpumask[100+6*MAX_CPUS]; |
85 | |
86 | static void usage(void) |
87 | { |
88 | fprintf(stderr, "procacct [-v] [-w logfile] [-r bufsize] [-m cpumask]\n" ); |
89 | fprintf(stderr, " -v: debug on\n" ); |
90 | } |
91 | |
92 | /* |
93 | * Create a raw netlink socket and bind |
94 | */ |
95 | static int create_nl_socket(int protocol) |
96 | { |
97 | int fd; |
98 | struct sockaddr_nl local; |
99 | |
100 | fd = socket(AF_NETLINK, SOCK_RAW, protocol); |
101 | if (fd < 0) |
102 | return -1; |
103 | |
104 | if (rcvbufsz) |
105 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, |
106 | &rcvbufsz, sizeof(rcvbufsz)) < 0) { |
107 | fprintf(stderr, "Unable to set socket rcv buf size to %d\n" , |
108 | rcvbufsz); |
109 | goto error; |
110 | } |
111 | |
112 | memset(&local, 0, sizeof(local)); |
113 | local.nl_family = AF_NETLINK; |
114 | |
115 | if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0) |
116 | goto error; |
117 | |
118 | return fd; |
119 | error: |
120 | close(fd); |
121 | return -1; |
122 | } |
123 | |
124 | |
125 | static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid, |
126 | __u8 genl_cmd, __u16 nla_type, |
127 | void *nla_data, int nla_len) |
128 | { |
129 | struct nlattr *na; |
130 | struct sockaddr_nl nladdr; |
131 | int r, buflen; |
132 | char *buf; |
133 | |
134 | struct msgtemplate msg; |
135 | |
136 | msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN); |
137 | msg.n.nlmsg_type = nlmsg_type; |
138 | msg.n.nlmsg_flags = NLM_F_REQUEST; |
139 | msg.n.nlmsg_seq = 0; |
140 | msg.n.nlmsg_pid = nlmsg_pid; |
141 | msg.g.cmd = genl_cmd; |
142 | msg.g.version = 0x1; |
143 | na = (struct nlattr *) GENLMSG_DATA(&msg); |
144 | na->nla_type = nla_type; |
145 | na->nla_len = nla_len + 1 + NLA_HDRLEN; |
146 | memcpy(NLA_DATA(na), nla_data, nla_len); |
147 | msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len); |
148 | |
149 | buf = (char *) &msg; |
150 | buflen = msg.n.nlmsg_len; |
151 | memset(&nladdr, 0, sizeof(nladdr)); |
152 | nladdr.nl_family = AF_NETLINK; |
153 | while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr, |
154 | sizeof(nladdr))) < buflen) { |
155 | if (r > 0) { |
156 | buf += r; |
157 | buflen -= r; |
158 | } else if (errno != EAGAIN) |
159 | return -1; |
160 | } |
161 | return 0; |
162 | } |
163 | |
164 | |
165 | /* |
166 | * Probe the controller in genetlink to find the family id |
167 | * for the TASKSTATS family |
168 | */ |
169 | static int get_family_id(int sd) |
170 | { |
171 | struct { |
172 | struct nlmsghdr n; |
173 | struct genlmsghdr g; |
174 | char buf[256]; |
175 | } ans; |
176 | |
177 | int id = 0, rc; |
178 | struct nlattr *na; |
179 | int rep_len; |
180 | |
181 | strcpy(p: name, TASKSTATS_GENL_NAME); |
182 | rc = send_cmd(sd, GENL_ID_CTRL, nlmsg_pid: getpid(), genl_cmd: CTRL_CMD_GETFAMILY, |
183 | nla_type: CTRL_ATTR_FAMILY_NAME, nla_data: (void *)name, |
184 | strlen(TASKSTATS_GENL_NAME)+1); |
185 | if (rc < 0) |
186 | return 0; /* sendto() failure? */ |
187 | |
188 | rep_len = recv(sd, &ans, sizeof(ans), 0); |
189 | if (ans.n.nlmsg_type == NLMSG_ERROR || |
190 | (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len)) |
191 | return 0; |
192 | |
193 | na = (struct nlattr *) GENLMSG_DATA(&ans); |
194 | na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len)); |
195 | if (na->nla_type == CTRL_ATTR_FAMILY_ID) |
196 | id = *(__u16 *) NLA_DATA(na); |
197 | |
198 | return id; |
199 | } |
200 | |
201 | #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1)) |
202 | |
203 | static void print_procacct(struct taskstats *t) |
204 | { |
205 | /* First letter: T is a mere thread, G the last in a group, U unknown. */ |
206 | printf( |
207 | "%c pid=%lu tgid=%lu uid=%lu wall=%llu gwall=%llu cpu=%llu vmpeak=%llu rsspeak=%llu dev=%lu:%lu inode=%llu comm=%s\n" |
208 | , t->version >= 12 ? (t->ac_flag & AGROUP ? 'P' : 'T') : '?' |
209 | , (unsigned long)t->ac_pid |
210 | , (unsigned long)(t->version >= 12 ? t->ac_tgid : 0) |
211 | , (unsigned long)t->ac_uid |
212 | , (unsigned long long)t->ac_etime |
213 | , (unsigned long long)(t->version >= 12 ? t->ac_tgetime : 0) |
214 | , (unsigned long long)(t->ac_utime+t->ac_stime) |
215 | , (unsigned long long)t->hiwater_vm |
216 | , (unsigned long long)t->hiwater_rss |
217 | , (unsigned long)(t->version >= 12 ? MAJOR(t->ac_exe_dev) : 0) |
218 | , (unsigned long)(t->version >= 12 ? MINOR(t->ac_exe_dev) : 0) |
219 | , (unsigned long long)(t->version >= 12 ? t->ac_exe_inode : 0) |
220 | , t->ac_comm |
221 | ); |
222 | } |
223 | |
224 | void handle_aggr(int mother, struct nlattr *na, int fd) |
225 | { |
226 | int aggr_len = NLA_PAYLOAD(na->nla_len); |
227 | int len2 = 0; |
228 | pid_t rtid = 0; |
229 | |
230 | na = (struct nlattr *) NLA_DATA(na); |
231 | while (len2 < aggr_len) { |
232 | switch (na->nla_type) { |
233 | case TASKSTATS_TYPE_PID: |
234 | rtid = *(int *) NLA_DATA(na); |
235 | PRINTF("PID\t%d\n" , rtid); |
236 | break; |
237 | case TASKSTATS_TYPE_TGID: |
238 | rtid = *(int *) NLA_DATA(na); |
239 | PRINTF("TGID\t%d\n" , rtid); |
240 | break; |
241 | case TASKSTATS_TYPE_STATS: |
242 | if (mother == TASKSTATS_TYPE_AGGR_PID) |
243 | print_procacct(t: (struct taskstats *) NLA_DATA(na)); |
244 | if (fd) { |
245 | if (write(fd, NLA_DATA(na), na->nla_len) < 0) |
246 | err(1, "write error\n" ); |
247 | } |
248 | break; |
249 | case TASKSTATS_TYPE_NULL: |
250 | break; |
251 | default: |
252 | fprintf(stderr, "Unknown nested nla_type %d\n" , |
253 | na->nla_type); |
254 | break; |
255 | } |
256 | len2 += NLA_ALIGN(na->nla_len); |
257 | na = (struct nlattr *)((char *)na + |
258 | NLA_ALIGN(na->nla_len)); |
259 | } |
260 | } |
261 | |
262 | int main(int argc, char *argv[]) |
263 | { |
264 | int c, rc, rep_len; |
265 | __u16 id; |
266 | __u32 mypid; |
267 | |
268 | struct nlattr *na; |
269 | int nl_sd = -1; |
270 | int len = 0; |
271 | |
272 | int fd = 0; |
273 | int write_file = 0; |
274 | int maskset = 0; |
275 | char *logfile = NULL; |
276 | int cfd = 0; |
277 | int forking = 0; |
278 | |
279 | struct msgtemplate msg; |
280 | |
281 | while (!forking) { |
282 | c = getopt(argc, argv, "m:vr:" ); |
283 | if (c < 0) |
284 | break; |
285 | |
286 | switch (c) { |
287 | case 'w': |
288 | logfile = strdup(optarg); |
289 | printf("write to file %s\n" , logfile); |
290 | write_file = 1; |
291 | break; |
292 | case 'r': |
293 | rcvbufsz = atoi(optarg); |
294 | printf("receive buf size %d\n" , rcvbufsz); |
295 | if (rcvbufsz < 0) |
296 | err(1, "Invalid rcv buf size\n" ); |
297 | break; |
298 | case 'm': |
299 | strncpy(cpumask, optarg, sizeof(cpumask)); |
300 | cpumask[sizeof(cpumask) - 1] = '\0'; |
301 | maskset = 1; |
302 | break; |
303 | case 'v': |
304 | printf("debug on\n" ); |
305 | dbg = 1; |
306 | break; |
307 | default: |
308 | usage(); |
309 | exit(-1); |
310 | } |
311 | } |
312 | if (!maskset) { |
313 | maskset = 1; |
314 | strncpy(p: cpumask, q: "1" , size: sizeof(cpumask)); |
315 | cpumask[sizeof(cpumask) - 1] = '\0'; |
316 | } |
317 | printf("cpumask %s maskset %d\n" , cpumask, maskset); |
318 | |
319 | if (write_file) { |
320 | fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC, 0644); |
321 | if (fd == -1) { |
322 | perror("Cannot open output file\n" ); |
323 | exit(1); |
324 | } |
325 | } |
326 | |
327 | nl_sd = create_nl_socket(NETLINK_GENERIC); |
328 | if (nl_sd < 0) |
329 | err(1, "error creating Netlink socket\n" ); |
330 | |
331 | mypid = getpid(); |
332 | id = get_family_id(sd: nl_sd); |
333 | if (!id) { |
334 | fprintf(stderr, "Error getting family id, errno %d\n" , errno); |
335 | goto err; |
336 | } |
337 | PRINTF("family id %d\n" , id); |
338 | |
339 | if (maskset) { |
340 | rc = send_cmd(sd: nl_sd, nlmsg_type: id, nlmsg_pid: mypid, genl_cmd: TASKSTATS_CMD_GET, |
341 | nla_type: TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, |
342 | nla_data: &cpumask, strlen(cpumask) + 1); |
343 | PRINTF("Sent register cpumask, retval %d\n" , rc); |
344 | if (rc < 0) { |
345 | fprintf(stderr, "error sending register cpumask\n" ); |
346 | goto err; |
347 | } |
348 | } |
349 | |
350 | do { |
351 | rep_len = recv(nl_sd, &msg, sizeof(msg), 0); |
352 | PRINTF("received %d bytes\n" , rep_len); |
353 | |
354 | if (rep_len < 0) { |
355 | fprintf(stderr, "nonfatal reply error: errno %d\n" , |
356 | errno); |
357 | continue; |
358 | } |
359 | if (msg.n.nlmsg_type == NLMSG_ERROR || |
360 | !NLMSG_OK((&msg.n), rep_len)) { |
361 | struct nlmsgerr *err = NLMSG_DATA(&msg); |
362 | |
363 | fprintf(stderr, "fatal reply error, errno %d\n" , |
364 | err->error); |
365 | goto done; |
366 | } |
367 | |
368 | PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n" , |
369 | sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len); |
370 | |
371 | |
372 | rep_len = GENLMSG_PAYLOAD(&msg.n); |
373 | |
374 | na = (struct nlattr *) GENLMSG_DATA(&msg); |
375 | len = 0; |
376 | while (len < rep_len) { |
377 | len += NLA_ALIGN(na->nla_len); |
378 | int mother = na->nla_type; |
379 | |
380 | PRINTF("mother=%i\n" , mother); |
381 | switch (na->nla_type) { |
382 | case TASKSTATS_TYPE_AGGR_PID: |
383 | case TASKSTATS_TYPE_AGGR_TGID: |
384 | /* For nested attributes, na follows */ |
385 | handle_aggr(mother, na, fd); |
386 | break; |
387 | default: |
388 | fprintf(stderr, "Unexpected nla_type %d\n" , |
389 | na->nla_type); |
390 | case TASKSTATS_TYPE_NULL: |
391 | break; |
392 | } |
393 | na = (struct nlattr *) (GENLMSG_DATA(&msg) + len); |
394 | } |
395 | } while (1); |
396 | done: |
397 | if (maskset) { |
398 | rc = send_cmd(sd: nl_sd, nlmsg_type: id, nlmsg_pid: mypid, genl_cmd: TASKSTATS_CMD_GET, |
399 | nla_type: TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, |
400 | nla_data: &cpumask, strlen(cpumask) + 1); |
401 | printf("Sent deregister mask, retval %d\n" , rc); |
402 | if (rc < 0) |
403 | err(rc, "error sending deregister cpumask\n" ); |
404 | } |
405 | err: |
406 | close(nl_sd); |
407 | if (fd) |
408 | close(fd); |
409 | if (cfd) |
410 | close(cfd); |
411 | return 0; |
412 | } |
413 | |