fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / Documentation / accounting / getdelays.c
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1 /* getdelays.c
3 * Utility to get per-pid and per-tgid delay accounting statistics
4 * Also illustrates usage of the taskstats interface
6 * Copyright (C) Shailabh Nagar, IBM Corp. 2005
7 * Copyright (C) Balbir Singh, IBM Corp. 2006
8 * Copyright (c) Jay Lan, SGI. 2006
10 * Compile with
11 * gcc -I/usr/src/linux/include getdelays.c -o getdelays
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>
27 #include <linux/genetlink.h>
28 #include <linux/taskstats.h>
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
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)
40 #define err(code, fmt, arg...) \
41 do { \
42 fprintf(stderr, fmt, ##arg); \
43 exit(code); \
44 } while (0)
46 int done;
47 int rcvbufsz;
48 char name[100];
49 int dbg;
50 int print_delays;
51 int print_io_accounting;
52 int print_task_context_switch_counts;
53 __u64 stime, utime;
55 #define PRINTF(fmt, arg...) { \
56 if (dbg) { \
57 printf(fmt, ##arg); \
58 } \
61 /* Maximum size of response requested or message sent */
62 #define MAX_MSG_SIZE 1024
63 /* Maximum number of cpus expected to be specified in a cpumask */
64 #define MAX_CPUS 32
66 struct msgtemplate {
67 struct nlmsghdr n;
68 struct genlmsghdr g;
69 char buf[MAX_MSG_SIZE];
72 char cpumask[100+6*MAX_CPUS];
74 static void usage(void)
76 fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
77 "[-m cpumask] [-t tgid] [-p pid]\n");
78 fprintf(stderr, " -d: print delayacct stats\n");
79 fprintf(stderr, " -i: print IO accounting (works only with -p)\n");
80 fprintf(stderr, " -l: listen forever\n");
81 fprintf(stderr, " -v: debug on\n");
85 * Create a raw netlink socket and bind
87 static int create_nl_socket(int protocol)
89 int fd;
90 struct sockaddr_nl local;
92 fd = socket(AF_NETLINK, SOCK_RAW, protocol);
93 if (fd < 0)
94 return -1;
96 if (rcvbufsz)
97 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
98 &rcvbufsz, sizeof(rcvbufsz)) < 0) {
99 fprintf(stderr, "Unable to set socket rcv buf size "
100 "to %d\n",
101 rcvbufsz);
102 return -1;
105 memset(&local, 0, sizeof(local));
106 local.nl_family = AF_NETLINK;
108 if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
109 goto error;
111 return fd;
112 error:
113 close(fd);
114 return -1;
118 int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
119 __u8 genl_cmd, __u16 nla_type,
120 void *nla_data, int nla_len)
122 struct nlattr *na;
123 struct sockaddr_nl nladdr;
124 int r, buflen;
125 char *buf;
127 struct msgtemplate msg;
129 msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
130 msg.n.nlmsg_type = nlmsg_type;
131 msg.n.nlmsg_flags = NLM_F_REQUEST;
132 msg.n.nlmsg_seq = 0;
133 msg.n.nlmsg_pid = nlmsg_pid;
134 msg.g.cmd = genl_cmd;
135 msg.g.version = 0x1;
136 na = (struct nlattr *) GENLMSG_DATA(&msg);
137 na->nla_type = nla_type;
138 na->nla_len = nla_len + 1 + NLA_HDRLEN;
139 memcpy(NLA_DATA(na), nla_data, nla_len);
140 msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
142 buf = (char *) &msg;
143 buflen = msg.n.nlmsg_len ;
144 memset(&nladdr, 0, sizeof(nladdr));
145 nladdr.nl_family = AF_NETLINK;
146 while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
147 sizeof(nladdr))) < buflen) {
148 if (r > 0) {
149 buf += r;
150 buflen -= r;
151 } else if (errno != EAGAIN)
152 return -1;
154 return 0;
159 * Probe the controller in genetlink to find the family id
160 * for the TASKSTATS family
162 int get_family_id(int sd)
164 struct {
165 struct nlmsghdr n;
166 struct genlmsghdr g;
167 char buf[256];
168 } ans;
170 int id, rc;
171 struct nlattr *na;
172 int rep_len;
174 strcpy(name, TASKSTATS_GENL_NAME);
175 rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
176 CTRL_ATTR_FAMILY_NAME, (void *)name,
177 strlen(TASKSTATS_GENL_NAME)+1);
179 rep_len = recv(sd, &ans, sizeof(ans), 0);
180 if (ans.n.nlmsg_type == NLMSG_ERROR ||
181 (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
182 return 0;
184 na = (struct nlattr *) GENLMSG_DATA(&ans);
185 na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
186 if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
187 id = *(__u16 *) NLA_DATA(na);
189 return id;
192 void print_delayacct(struct taskstats *t)
194 printf("\n\nCPU %15s%15s%15s%15s\n"
195 " %15llu%15llu%15llu%15llu\n"
196 "IO %15s%15s\n"
197 " %15llu%15llu\n"
198 "MEM %15s%15s\n"
199 " %15llu%15llu\n",
200 "count", "real total", "virtual total", "delay total",
201 t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
202 t->cpu_delay_total,
203 "count", "delay total",
204 t->blkio_count, t->blkio_delay_total,
205 "count", "delay total", t->swapin_count, t->swapin_delay_total);
208 void task_context_switch_counts(struct taskstats *t)
210 printf("\n\nTask %15s%15s\n"
211 " %15lu%15lu\n",
212 "voluntary", "nonvoluntary",
213 t->nvcsw, t->nivcsw);
216 void print_ioacct(struct taskstats *t)
218 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
219 t->ac_comm,
220 (unsigned long long)t->read_bytes,
221 (unsigned long long)t->write_bytes,
222 (unsigned long long)t->cancelled_write_bytes);
225 int main(int argc, char *argv[])
227 int c, rc, rep_len, aggr_len, len2, cmd_type;
228 __u16 id;
229 __u32 mypid;
231 struct nlattr *na;
232 int nl_sd = -1;
233 int len = 0;
234 pid_t tid = 0;
235 pid_t rtid = 0;
237 int fd = 0;
238 int count = 0;
239 int write_file = 0;
240 int maskset = 0;
241 char *logfile = NULL;
242 int loop = 0;
244 struct msgtemplate msg;
246 while (1) {
247 c = getopt(argc, argv, "qdiw:r:m:t:p:vl");
248 if (c < 0)
249 break;
251 switch (c) {
252 case 'd':
253 printf("print delayacct stats ON\n");
254 print_delays = 1;
255 break;
256 case 'i':
257 printf("printing IO accounting\n");
258 print_io_accounting = 1;
259 break;
260 case 'q':
261 printf("printing task/process context switch rates\n");
262 print_task_context_switch_counts = 1;
263 break;
264 case 'w':
265 logfile = strdup(optarg);
266 printf("write to file %s\n", logfile);
267 write_file = 1;
268 break;
269 case 'r':
270 rcvbufsz = atoi(optarg);
271 printf("receive buf size %d\n", rcvbufsz);
272 if (rcvbufsz < 0)
273 err(1, "Invalid rcv buf size\n");
274 break;
275 case 'm':
276 strncpy(cpumask, optarg, sizeof(cpumask));
277 maskset = 1;
278 printf("cpumask %s maskset %d\n", cpumask, maskset);
279 break;
280 case 't':
281 tid = atoi(optarg);
282 if (!tid)
283 err(1, "Invalid tgid\n");
284 cmd_type = TASKSTATS_CMD_ATTR_TGID;
285 break;
286 case 'p':
287 tid = atoi(optarg);
288 if (!tid)
289 err(1, "Invalid pid\n");
290 cmd_type = TASKSTATS_CMD_ATTR_PID;
291 break;
292 case 'v':
293 printf("debug on\n");
294 dbg = 1;
295 break;
296 case 'l':
297 printf("listen forever\n");
298 loop = 1;
299 break;
300 default:
301 usage();
302 exit(-1);
306 if (write_file) {
307 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
308 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
309 if (fd == -1) {
310 perror("Cannot open output file\n");
311 exit(1);
315 if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
316 err(1, "error creating Netlink socket\n");
319 mypid = getpid();
320 id = get_family_id(nl_sd);
321 if (!id) {
322 fprintf(stderr, "Error getting family id, errno %d\n", errno);
323 goto err;
325 PRINTF("family id %d\n", id);
327 if (maskset) {
328 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
329 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
330 &cpumask, strlen(cpumask) + 1);
331 PRINTF("Sent register cpumask, retval %d\n", rc);
332 if (rc < 0) {
333 fprintf(stderr, "error sending register cpumask\n");
334 goto err;
338 if (tid) {
339 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
340 cmd_type, &tid, sizeof(__u32));
341 PRINTF("Sent pid/tgid, retval %d\n", rc);
342 if (rc < 0) {
343 fprintf(stderr, "error sending tid/tgid cmd\n");
344 goto done;
348 do {
349 int i;
351 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
352 PRINTF("received %d bytes\n", rep_len);
354 if (rep_len < 0) {
355 fprintf(stderr, "nonfatal reply error: errno %d\n",
356 errno);
357 continue;
359 if (msg.n.nlmsg_type == NLMSG_ERROR ||
360 !NLMSG_OK((&msg.n), rep_len)) {
361 struct nlmsgerr *err = NLMSG_DATA(&msg);
362 fprintf(stderr, "fatal reply error, errno %d\n",
363 err->error);
364 goto done;
367 PRINTF("nlmsghdr size=%d, nlmsg_len=%d, rep_len=%d\n",
368 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
371 rep_len = GENLMSG_PAYLOAD(&msg.n);
373 na = (struct nlattr *) GENLMSG_DATA(&msg);
374 len = 0;
375 i = 0;
376 while (len < rep_len) {
377 len += NLA_ALIGN(na->nla_len);
378 switch (na->nla_type) {
379 case TASKSTATS_TYPE_AGGR_TGID:
380 /* Fall through */
381 case TASKSTATS_TYPE_AGGR_PID:
382 aggr_len = NLA_PAYLOAD(na->nla_len);
383 len2 = 0;
384 /* For nested attributes, na follows */
385 na = (struct nlattr *) NLA_DATA(na);
386 done = 0;
387 while (len2 < aggr_len) {
388 switch (na->nla_type) {
389 case TASKSTATS_TYPE_PID:
390 rtid = *(int *) NLA_DATA(na);
391 if (print_delays)
392 printf("PID\t%d\n", rtid);
393 break;
394 case TASKSTATS_TYPE_TGID:
395 rtid = *(int *) NLA_DATA(na);
396 if (print_delays)
397 printf("TGID\t%d\n", rtid);
398 break;
399 case TASKSTATS_TYPE_STATS:
400 count++;
401 if (print_delays)
402 print_delayacct((struct taskstats *) NLA_DATA(na));
403 if (print_io_accounting)
404 print_ioacct((struct taskstats *) NLA_DATA(na));
405 if (print_task_context_switch_counts)
406 task_context_switch_counts((struct taskstats *) NLA_DATA(na));
407 if (fd) {
408 if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
409 err(1,"write error\n");
412 if (!loop)
413 goto done;
414 break;
415 default:
416 fprintf(stderr, "Unknown nested"
417 " nla_type %d\n",
418 na->nla_type);
419 break;
421 len2 += NLA_ALIGN(na->nla_len);
422 na = (struct nlattr *) ((char *) na + len2);
424 break;
426 default:
427 fprintf(stderr, "Unknown nla_type %d\n",
428 na->nla_type);
429 break;
431 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
433 } while (loop);
434 done:
435 if (maskset) {
436 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
437 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
438 &cpumask, strlen(cpumask) + 1);
439 printf("Sent deregister mask, retval %d\n", rc);
440 if (rc < 0)
441 err(rc, "error sending deregister cpumask\n");
443 err:
444 close(nl_sd);
445 if (fd)
446 close(fd);
447 return 0;