Commit | Line | Data |
---|---|---|
a3baf649 SN |
1 | /* getdelays.c |
2 | * | |
3 | * Utility to get per-pid and per-tgid delay accounting statistics | |
4 | * Also illustrates usage of the taskstats interface | |
5 | * | |
6 | * Copyright (C) Shailabh Nagar, IBM Corp. 2005 | |
7 | * Copyright (C) Balbir Singh, IBM Corp. 2006 | |
9e06d3f9 | 8 | * Copyright (c) Jay Lan, SGI. 2006 |
a3baf649 | 9 | * |
d2f7bf13 AM |
10 | * Compile with |
11 | * gcc -I/usr/src/linux/include getdelays.c -o getdelays | |
a3baf649 SN |
12 | */ |
13 | ||
14 | #include <stdio.h> | |
15 | #include <stdlib.h> | |
16 | #include <errno.h> | |
17 | #include <unistd.h> | |
18 | #include <poll.h> | |
19 | #include <string.h> | |
20 | #include <fcntl.h> | |
21 | #include <sys/types.h> | |
22 | #include <sys/stat.h> | |
23 | #include <sys/socket.h> | |
24 | #include <sys/types.h> | |
25 | #include <signal.h> | |
26 | ||
27 | #include <linux/genetlink.h> | |
28 | #include <linux/taskstats.h> | |
29 | ||
30 | /* | |
31 | * Generic macros for dealing with netlink sockets. Might be duplicated | |
32 | * elsewhere. It is recommended that commercial grade applications use | |
33 | * libnl or libnetlink and use the interfaces provided by the library | |
34 | */ | |
35 | #define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN)) | |
36 | #define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN) | |
37 | #define NLA_DATA(na) ((void *)((char*)(na) + NLA_HDRLEN)) | |
38 | #define NLA_PAYLOAD(len) (len - NLA_HDRLEN) | |
39 | ||
d2f7bf13 AM |
40 | #define err(code, fmt, arg...) \ |
41 | do { \ | |
42 | fprintf(stderr, fmt, ##arg); \ | |
43 | exit(code); \ | |
44 | } while (0) | |
45 | ||
46 | int done; | |
47 | int rcvbufsz; | |
48 | char name[100]; | |
49 | int dbg; | |
50 | int print_delays; | |
cf709844 | 51 | int print_io_accounting; |
9e06d3f9 | 52 | __u64 stime, utime; |
d2f7bf13 | 53 | |
9e06d3f9 SN |
54 | #define PRINTF(fmt, arg...) { \ |
55 | if (dbg) { \ | |
56 | printf(fmt, ##arg); \ | |
57 | } \ | |
58 | } | |
59 | ||
60 | /* Maximum size of response requested or message sent */ | |
88040230 | 61 | #define MAX_MSG_SIZE 1024 |
9e06d3f9 SN |
62 | /* Maximum number of cpus expected to be specified in a cpumask */ |
63 | #define MAX_CPUS 32 | |
64 | /* Maximum length of pathname to log file */ | |
65 | #define MAX_FILENAME 256 | |
66 | ||
67 | struct msgtemplate { | |
68 | struct nlmsghdr n; | |
69 | struct genlmsghdr g; | |
70 | char buf[MAX_MSG_SIZE]; | |
71 | }; | |
72 | ||
73 | char cpumask[100+6*MAX_CPUS]; | |
a3baf649 | 74 | |
f16825bb RD |
75 | static void usage(void) |
76 | { | |
77 | fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] " | |
78 | "[-m cpumask] [-t tgid] [-p pid]\n"); | |
79 | fprintf(stderr, " -d: print delayacct stats\n"); | |
80 | fprintf(stderr, " -i: print IO accounting (works only with -p)\n"); | |
81 | fprintf(stderr, " -l: listen forever\n"); | |
82 | fprintf(stderr, " -v: debug on\n"); | |
83 | } | |
84 | ||
a3baf649 SN |
85 | /* |
86 | * Create a raw netlink socket and bind | |
87 | */ | |
9e06d3f9 | 88 | static int create_nl_socket(int protocol) |
a3baf649 | 89 | { |
9e06d3f9 SN |
90 | int fd; |
91 | struct sockaddr_nl local; | |
92 | ||
93 | fd = socket(AF_NETLINK, SOCK_RAW, protocol); | |
94 | if (fd < 0) | |
95 | return -1; | |
96 | ||
97 | if (rcvbufsz) | |
98 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, | |
99 | &rcvbufsz, sizeof(rcvbufsz)) < 0) { | |
d2f7bf13 AM |
100 | fprintf(stderr, "Unable to set socket rcv buf size " |
101 | "to %d\n", | |
102 | rcvbufsz); | |
9e06d3f9 SN |
103 | return -1; |
104 | } | |
a3baf649 | 105 | |
9e06d3f9 SN |
106 | memset(&local, 0, sizeof(local)); |
107 | local.nl_family = AF_NETLINK; | |
a3baf649 | 108 | |
9e06d3f9 SN |
109 | if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0) |
110 | goto error; | |
a3baf649 | 111 | |
9e06d3f9 SN |
112 | return fd; |
113 | error: | |
114 | close(fd); | |
115 | return -1; | |
a3baf649 SN |
116 | } |
117 | ||
9e06d3f9 SN |
118 | |
119 | int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid, | |
120 | __u8 genl_cmd, __u16 nla_type, | |
121 | void *nla_data, int nla_len) | |
a3baf649 | 122 | { |
9e06d3f9 SN |
123 | struct nlattr *na; |
124 | struct sockaddr_nl nladdr; | |
125 | int r, buflen; | |
126 | char *buf; | |
127 | ||
128 | struct msgtemplate msg; | |
129 | ||
130 | msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN); | |
131 | msg.n.nlmsg_type = nlmsg_type; | |
132 | msg.n.nlmsg_flags = NLM_F_REQUEST; | |
133 | msg.n.nlmsg_seq = 0; | |
134 | msg.n.nlmsg_pid = nlmsg_pid; | |
135 | msg.g.cmd = genl_cmd; | |
136 | msg.g.version = 0x1; | |
137 | na = (struct nlattr *) GENLMSG_DATA(&msg); | |
138 | na->nla_type = nla_type; | |
139 | na->nla_len = nla_len + 1 + NLA_HDRLEN; | |
140 | memcpy(NLA_DATA(na), nla_data, nla_len); | |
141 | msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len); | |
142 | ||
143 | buf = (char *) &msg; | |
144 | buflen = msg.n.nlmsg_len ; | |
145 | memset(&nladdr, 0, sizeof(nladdr)); | |
146 | nladdr.nl_family = AF_NETLINK; | |
147 | while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr, | |
148 | sizeof(nladdr))) < buflen) { | |
149 | if (r > 0) { | |
150 | buf += r; | |
151 | buflen -= r; | |
152 | } else if (errno != EAGAIN) | |
153 | return -1; | |
154 | } | |
155 | return 0; | |
a3baf649 SN |
156 | } |
157 | ||
9e06d3f9 | 158 | |
a3baf649 SN |
159 | /* |
160 | * Probe the controller in genetlink to find the family id | |
161 | * for the TASKSTATS family | |
162 | */ | |
163 | int get_family_id(int sd) | |
164 | { | |
9e06d3f9 SN |
165 | struct { |
166 | struct nlmsghdr n; | |
167 | struct genlmsghdr g; | |
168 | char buf[256]; | |
169 | } ans; | |
170 | ||
171 | int id, rc; | |
172 | struct nlattr *na; | |
173 | int rep_len; | |
174 | ||
175 | strcpy(name, TASKSTATS_GENL_NAME); | |
176 | rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY, | |
177 | CTRL_ATTR_FAMILY_NAME, (void *)name, | |
178 | strlen(TASKSTATS_GENL_NAME)+1); | |
179 | ||
180 | rep_len = recv(sd, &ans, sizeof(ans), 0); | |
181 | if (ans.n.nlmsg_type == NLMSG_ERROR || | |
182 | (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len)) | |
183 | return 0; | |
a3baf649 | 184 | |
9e06d3f9 SN |
185 | na = (struct nlattr *) GENLMSG_DATA(&ans); |
186 | na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len)); | |
187 | if (na->nla_type == CTRL_ATTR_FAMILY_ID) { | |
188 | id = *(__u16 *) NLA_DATA(na); | |
189 | } | |
190 | return id; | |
a3baf649 SN |
191 | } |
192 | ||
9e06d3f9 | 193 | void print_delayacct(struct taskstats *t) |
a3baf649 | 194 | { |
9e06d3f9 SN |
195 | printf("\n\nCPU %15s%15s%15s%15s\n" |
196 | " %15llu%15llu%15llu%15llu\n" | |
197 | "IO %15s%15s\n" | |
198 | " %15llu%15llu\n" | |
199 | "MEM %15s%15s\n" | |
200 | " %15llu%15llu\n\n", | |
201 | "count", "real total", "virtual total", "delay total", | |
202 | t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total, | |
203 | t->cpu_delay_total, | |
204 | "count", "delay total", | |
205 | t->blkio_count, t->blkio_delay_total, | |
206 | "count", "delay total", t->swapin_count, t->swapin_delay_total); | |
a3baf649 SN |
207 | } |
208 | ||
cf709844 AM |
209 | void print_ioacct(struct taskstats *t) |
210 | { | |
211 | printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n", | |
212 | t->ac_comm, | |
213 | (unsigned long long)t->read_bytes, | |
214 | (unsigned long long)t->write_bytes, | |
215 | (unsigned long long)t->cancelled_write_bytes); | |
216 | } | |
217 | ||
a3baf649 SN |
218 | int main(int argc, char *argv[]) |
219 | { | |
9e06d3f9 SN |
220 | int c, rc, rep_len, aggr_len, len2, cmd_type; |
221 | __u16 id; | |
222 | __u32 mypid; | |
223 | ||
224 | struct nlattr *na; | |
225 | int nl_sd = -1; | |
226 | int len = 0; | |
227 | pid_t tid = 0; | |
228 | pid_t rtid = 0; | |
229 | ||
230 | int fd = 0; | |
231 | int count = 0; | |
232 | int write_file = 0; | |
233 | int maskset = 0; | |
234 | char logfile[128]; | |
235 | int loop = 0; | |
236 | ||
237 | struct msgtemplate msg; | |
238 | ||
239 | while (1) { | |
f16825bb | 240 | c = getopt(argc, argv, "diw:r:m:t:p:vl"); |
9e06d3f9 SN |
241 | if (c < 0) |
242 | break; | |
a3baf649 | 243 | |
9e06d3f9 SN |
244 | switch (c) { |
245 | case 'd': | |
246 | printf("print delayacct stats ON\n"); | |
247 | print_delays = 1; | |
248 | break; | |
cf709844 AM |
249 | case 'i': |
250 | printf("printing IO accounting\n"); | |
251 | print_io_accounting = 1; | |
252 | break; | |
9e06d3f9 SN |
253 | case 'w': |
254 | strncpy(logfile, optarg, MAX_FILENAME); | |
255 | printf("write to file %s\n", logfile); | |
256 | write_file = 1; | |
257 | break; | |
258 | case 'r': | |
259 | rcvbufsz = atoi(optarg); | |
260 | printf("receive buf size %d\n", rcvbufsz); | |
261 | if (rcvbufsz < 0) | |
262 | err(1, "Invalid rcv buf size\n"); | |
263 | break; | |
264 | case 'm': | |
265 | strncpy(cpumask, optarg, sizeof(cpumask)); | |
266 | maskset = 1; | |
267 | printf("cpumask %s maskset %d\n", cpumask, maskset); | |
268 | break; | |
269 | case 't': | |
270 | tid = atoi(optarg); | |
271 | if (!tid) | |
272 | err(1, "Invalid tgid\n"); | |
273 | cmd_type = TASKSTATS_CMD_ATTR_TGID; | |
9e06d3f9 SN |
274 | break; |
275 | case 'p': | |
276 | tid = atoi(optarg); | |
277 | if (!tid) | |
278 | err(1, "Invalid pid\n"); | |
279 | cmd_type = TASKSTATS_CMD_ATTR_PID; | |
9e06d3f9 SN |
280 | break; |
281 | case 'v': | |
282 | printf("debug on\n"); | |
283 | dbg = 1; | |
284 | break; | |
285 | case 'l': | |
286 | printf("listen forever\n"); | |
287 | loop = 1; | |
288 | break; | |
289 | default: | |
f16825bb | 290 | usage(); |
9e06d3f9 | 291 | exit(-1); |
a3baf649 | 292 | } |
a3baf649 | 293 | } |
a3baf649 | 294 | |
9e06d3f9 SN |
295 | if (write_file) { |
296 | fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC, | |
297 | S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); | |
298 | if (fd == -1) { | |
299 | perror("Cannot open output file\n"); | |
300 | exit(1); | |
301 | } | |
302 | } | |
a3baf649 | 303 | |
9e06d3f9 SN |
304 | if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0) |
305 | err(1, "error creating Netlink socket\n"); | |
a3baf649 | 306 | |
a3baf649 | 307 | |
9e06d3f9 SN |
308 | mypid = getpid(); |
309 | id = get_family_id(nl_sd); | |
310 | if (!id) { | |
d2f7bf13 | 311 | fprintf(stderr, "Error getting family id, errno %d\n", errno); |
9e06d3f9 | 312 | goto err; |
a3baf649 | 313 | } |
9e06d3f9 SN |
314 | PRINTF("family id %d\n", id); |
315 | ||
316 | if (maskset) { | |
317 | rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, | |
318 | TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, | |
7d1bdca9 | 319 | &cpumask, strlen(cpumask) + 1); |
9e06d3f9 SN |
320 | PRINTF("Sent register cpumask, retval %d\n", rc); |
321 | if (rc < 0) { | |
d2f7bf13 | 322 | fprintf(stderr, "error sending register cpumask\n"); |
9e06d3f9 SN |
323 | goto err; |
324 | } | |
a3baf649 SN |
325 | } |
326 | ||
9e06d3f9 SN |
327 | if (tid) { |
328 | rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, | |
329 | cmd_type, &tid, sizeof(__u32)); | |
330 | PRINTF("Sent pid/tgid, retval %d\n", rc); | |
331 | if (rc < 0) { | |
d2f7bf13 | 332 | fprintf(stderr, "error sending tid/tgid cmd\n"); |
9e06d3f9 SN |
333 | goto done; |
334 | } | |
a3baf649 SN |
335 | } |
336 | ||
9e06d3f9 SN |
337 | do { |
338 | int i; | |
a3baf649 | 339 | |
9e06d3f9 SN |
340 | rep_len = recv(nl_sd, &msg, sizeof(msg), 0); |
341 | PRINTF("received %d bytes\n", rep_len); | |
a3baf649 | 342 | |
9e06d3f9 | 343 | if (rep_len < 0) { |
d2f7bf13 AM |
344 | fprintf(stderr, "nonfatal reply error: errno %d\n", |
345 | errno); | |
9e06d3f9 SN |
346 | continue; |
347 | } | |
348 | if (msg.n.nlmsg_type == NLMSG_ERROR || | |
349 | !NLMSG_OK((&msg.n), rep_len)) { | |
7d1bdca9 | 350 | struct nlmsgerr *err = NLMSG_DATA(&msg); |
d2f7bf13 AM |
351 | fprintf(stderr, "fatal reply error, errno %d\n", |
352 | err->error); | |
9e06d3f9 SN |
353 | goto done; |
354 | } | |
355 | ||
356 | PRINTF("nlmsghdr size=%d, nlmsg_len=%d, rep_len=%d\n", | |
357 | sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len); | |
358 | ||
359 | ||
360 | rep_len = GENLMSG_PAYLOAD(&msg.n); | |
361 | ||
362 | na = (struct nlattr *) GENLMSG_DATA(&msg); | |
363 | len = 0; | |
364 | i = 0; | |
365 | while (len < rep_len) { | |
366 | len += NLA_ALIGN(na->nla_len); | |
367 | switch (na->nla_type) { | |
368 | case TASKSTATS_TYPE_AGGR_TGID: | |
369 | /* Fall through */ | |
370 | case TASKSTATS_TYPE_AGGR_PID: | |
371 | aggr_len = NLA_PAYLOAD(na->nla_len); | |
372 | len2 = 0; | |
373 | /* For nested attributes, na follows */ | |
374 | na = (struct nlattr *) NLA_DATA(na); | |
375 | done = 0; | |
376 | while (len2 < aggr_len) { | |
377 | switch (na->nla_type) { | |
378 | case TASKSTATS_TYPE_PID: | |
379 | rtid = *(int *) NLA_DATA(na); | |
380 | if (print_delays) | |
381 | printf("PID\t%d\n", rtid); | |
382 | break; | |
383 | case TASKSTATS_TYPE_TGID: | |
384 | rtid = *(int *) NLA_DATA(na); | |
385 | if (print_delays) | |
386 | printf("TGID\t%d\n", rtid); | |
387 | break; | |
388 | case TASKSTATS_TYPE_STATS: | |
389 | count++; | |
390 | if (print_delays) | |
391 | print_delayacct((struct taskstats *) NLA_DATA(na)); | |
cf709844 AM |
392 | if (print_io_accounting) |
393 | print_ioacct((struct taskstats *) NLA_DATA(na)); | |
9e06d3f9 SN |
394 | if (fd) { |
395 | if (write(fd, NLA_DATA(na), na->nla_len) < 0) { | |
396 | err(1,"write error\n"); | |
397 | } | |
398 | } | |
399 | if (!loop) | |
400 | goto done; | |
401 | break; | |
402 | default: | |
d2f7bf13 AM |
403 | fprintf(stderr, "Unknown nested" |
404 | " nla_type %d\n", | |
405 | na->nla_type); | |
9e06d3f9 SN |
406 | break; |
407 | } | |
408 | len2 += NLA_ALIGN(na->nla_len); | |
409 | na = (struct nlattr *) ((char *) na + len2); | |
410 | } | |
411 | break; | |
412 | ||
413 | default: | |
d2f7bf13 AM |
414 | fprintf(stderr, "Unknown nla_type %d\n", |
415 | na->nla_type); | |
9e06d3f9 | 416 | break; |
a3baf649 | 417 | } |
9e06d3f9 | 418 | na = (struct nlattr *) (GENLMSG_DATA(&msg) + len); |
a3baf649 | 419 | } |
9e06d3f9 SN |
420 | } while (loop); |
421 | done: | |
422 | if (maskset) { | |
423 | rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, | |
424 | TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, | |
7d1bdca9 | 425 | &cpumask, strlen(cpumask) + 1); |
9e06d3f9 SN |
426 | printf("Sent deregister mask, retval %d\n", rc); |
427 | if (rc < 0) | |
428 | err(rc, "error sending deregister cpumask\n"); | |
a3baf649 | 429 | } |
9e06d3f9 SN |
430 | err: |
431 | close(nl_sd); | |
432 | if (fd) | |
433 | close(fd); | |
434 | return 0; | |
a3baf649 | 435 | } |