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TOMOYO Linux Cross Reference
Linux/Documentation/accounting/getdelays.c

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  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
  8  * Copyright (c) Jay Lan, SGI. 2006
  9  *
 10  * Compile with
 11  *      gcc -I/usr/src/linux/include getdelays.c -o getdelays
 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/wait.h>
 25 #include <signal.h>
 26 
 27 #include <linux/genetlink.h>
 28 #include <linux/taskstats.h>
 29 #include <linux/cgroupstats.h>
 30 
 31 /*
 32  * Generic macros for dealing with netlink sockets. Might be duplicated
 33  * elsewhere. It is recommended that commercial grade applications use
 34  * libnl or libnetlink and use the interfaces provided by the library
 35  */
 36 #define GENLMSG_DATA(glh)       ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
 37 #define GENLMSG_PAYLOAD(glh)    (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
 38 #define NLA_DATA(na)            ((void *)((char*)(na) + NLA_HDRLEN))
 39 #define NLA_PAYLOAD(len)        (len - NLA_HDRLEN)
 40 
 41 #define err(code, fmt, arg...)                  \
 42         do {                                    \
 43                 fprintf(stderr, fmt, ##arg);    \
 44                 exit(code);                     \
 45         } while (0)
 46 
 47 int done;
 48 int rcvbufsz;
 49 char name[100];
 50 int dbg;
 51 int print_delays;
 52 int print_io_accounting;
 53 int print_task_context_switch_counts;
 54 
 55 #define PRINTF(fmt, arg...) {                   \
 56             if (dbg) {                          \
 57                 printf(fmt, ##arg);             \
 58             }                                   \
 59         }
 60 
 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
 65 
 66 struct msgtemplate {
 67         struct nlmsghdr n;
 68         struct genlmsghdr g;
 69         char buf[MAX_MSG_SIZE];
 70 };
 71 
 72 char cpumask[100+6*MAX_CPUS];
 73 
 74 static void usage(void)
 75 {
 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");
 82         fprintf(stderr, "  -C: container path\n");
 83 }
 84 
 85 /*
 86  * Create a raw netlink socket and bind
 87  */
 88 static int create_nl_socket(int protocol)
 89 {
 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) {
100                         fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
101                                 rcvbufsz);
102                         goto error;
103                 }
104 
105         memset(&local, 0, sizeof(local));
106         local.nl_family = AF_NETLINK;
107 
108         if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
109                 goto error;
110 
111         return fd;
112 error:
113         close(fd);
114         return -1;
115 }
116 
117 
118 static 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)
121 {
122         struct nlattr *na;
123         struct sockaddr_nl nladdr;
124         int r, buflen;
125         char *buf;
126 
127         struct msgtemplate msg;
128 
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);
141 
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;
153         }
154         return 0;
155 }
156 
157 
158 /*
159  * Probe the controller in genetlink to find the family id
160  * for the TASKSTATS family
161  */
162 static int get_family_id(int sd)
163 {
164         struct {
165                 struct nlmsghdr n;
166                 struct genlmsghdr g;
167                 char buf[256];
168         } ans;
169 
170         int id = 0, rc;
171         struct nlattr *na;
172         int rep_len;
173 
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);
178         if (rc < 0)
179                 return 0;       /* sendto() failure? */
180 
181         rep_len = recv(sd, &ans, sizeof(ans), 0);
182         if (ans.n.nlmsg_type == NLMSG_ERROR ||
183             (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
184                 return 0;
185 
186         na = (struct nlattr *) GENLMSG_DATA(&ans);
187         na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
188         if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
189                 id = *(__u16 *) NLA_DATA(na);
190         }
191         return id;
192 }
193 
194 #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
195 
196 static void print_delayacct(struct taskstats *t)
197 {
198         printf("\n\nCPU   %15s%15s%15s%15s%15s\n"
199                "      %15llu%15llu%15llu%15llu%15.3fms\n"
200                "IO    %15s%15s%15s\n"
201                "      %15llu%15llu%15llums\n"
202                "SWAP  %15s%15s%15s\n"
203                "      %15llu%15llu%15llums\n"
204                "RECLAIM  %12s%15s%15s\n"
205                "      %15llu%15llu%15llums\n",
206                "count", "real total", "virtual total",
207                "delay total", "delay average",
208                (unsigned long long)t->cpu_count,
209                (unsigned long long)t->cpu_run_real_total,
210                (unsigned long long)t->cpu_run_virtual_total,
211                (unsigned long long)t->cpu_delay_total,
212                average_ms((double)t->cpu_delay_total, t->cpu_count),
213                "count", "delay total", "delay average",
214                (unsigned long long)t->blkio_count,
215                (unsigned long long)t->blkio_delay_total,
216                average_ms(t->blkio_delay_total, t->blkio_count),
217                "count", "delay total", "delay average",
218                (unsigned long long)t->swapin_count,
219                (unsigned long long)t->swapin_delay_total,
220                average_ms(t->swapin_delay_total, t->swapin_count),
221                "count", "delay total", "delay average",
222                (unsigned long long)t->freepages_count,
223                (unsigned long long)t->freepages_delay_total,
224                average_ms(t->freepages_delay_total, t->freepages_count));
225 }
226 
227 static void task_context_switch_counts(struct taskstats *t)
228 {
229         printf("\n\nTask   %15s%15s\n"
230                "       %15llu%15llu\n",
231                "voluntary", "nonvoluntary",
232                (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
233 }
234 
235 static void print_cgroupstats(struct cgroupstats *c)
236 {
237         printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
238                 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
239                 (unsigned long long)c->nr_io_wait,
240                 (unsigned long long)c->nr_running,
241                 (unsigned long long)c->nr_stopped,
242                 (unsigned long long)c->nr_uninterruptible);
243 }
244 
245 
246 static void print_ioacct(struct taskstats *t)
247 {
248         printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
249                 t->ac_comm,
250                 (unsigned long long)t->read_bytes,
251                 (unsigned long long)t->write_bytes,
252                 (unsigned long long)t->cancelled_write_bytes);
253 }
254 
255 int main(int argc, char *argv[])
256 {
257         int c, rc, rep_len, aggr_len, len2;
258         int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
259         __u16 id;
260         __u32 mypid;
261 
262         struct nlattr *na;
263         int nl_sd = -1;
264         int len = 0;
265         pid_t tid = 0;
266         pid_t rtid = 0;
267 
268         int fd = 0;
269         int count = 0;
270         int write_file = 0;
271         int maskset = 0;
272         char *logfile = NULL;
273         int loop = 0;
274         int containerset = 0;
275         char *containerpath = NULL;
276         int cfd = 0;
277         int forking = 0;
278         sigset_t sigset;
279 
280         struct msgtemplate msg;
281 
282         while (!forking) {
283                 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
284                 if (c < 0)
285                         break;
286 
287                 switch (c) {
288                 case 'd':
289                         printf("print delayacct stats ON\n");
290                         print_delays = 1;
291                         break;
292                 case 'i':
293                         printf("printing IO accounting\n");
294                         print_io_accounting = 1;
295                         break;
296                 case 'q':
297                         printf("printing task/process context switch rates\n");
298                         print_task_context_switch_counts = 1;
299                         break;
300                 case 'C':
301                         containerset = 1;
302                         containerpath = optarg;
303                         break;
304                 case 'w':
305                         logfile = strdup(optarg);
306                         printf("write to file %s\n", logfile);
307                         write_file = 1;
308                         break;
309                 case 'r':
310                         rcvbufsz = atoi(optarg);
311                         printf("receive buf size %d\n", rcvbufsz);
312                         if (rcvbufsz < 0)
313                                 err(1, "Invalid rcv buf size\n");
314                         break;
315                 case 'm':
316                         strncpy(cpumask, optarg, sizeof(cpumask));
317                         maskset = 1;
318                         printf("cpumask %s maskset %d\n", cpumask, maskset);
319                         break;
320                 case 't':
321                         tid = atoi(optarg);
322                         if (!tid)
323                                 err(1, "Invalid tgid\n");
324                         cmd_type = TASKSTATS_CMD_ATTR_TGID;
325                         break;
326                 case 'p':
327                         tid = atoi(optarg);
328                         if (!tid)
329                                 err(1, "Invalid pid\n");
330                         cmd_type = TASKSTATS_CMD_ATTR_PID;
331                         break;
332                 case 'c':
333 
334                         /* Block SIGCHLD for sigwait() later */
335                         if (sigemptyset(&sigset) == -1)
336                                 err(1, "Failed to empty sigset");
337                         if (sigaddset(&sigset, SIGCHLD))
338                                 err(1, "Failed to set sigchld in sigset");
339                         sigprocmask(SIG_BLOCK, &sigset, NULL);
340 
341                         /* fork/exec a child */
342                         tid = fork();
343                         if (tid < 0)
344                                 err(1, "Fork failed\n");
345                         if (tid == 0)
346                                 if (execvp(argv[optind - 1],
347                                     &argv[optind - 1]) < 0)
348                                         exit(-1);
349 
350                         /* Set the command type and avoid further processing */
351                         cmd_type = TASKSTATS_CMD_ATTR_PID;
352                         forking = 1;
353                         break;
354                 case 'v':
355                         printf("debug on\n");
356                         dbg = 1;
357                         break;
358                 case 'l':
359                         printf("listen forever\n");
360                         loop = 1;
361                         break;
362                 default:
363                         usage();
364                         exit(-1);
365                 }
366         }
367 
368         if (write_file) {
369                 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
370                           S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
371                 if (fd == -1) {
372                         perror("Cannot open output file\n");
373                         exit(1);
374                 }
375         }
376 
377         if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
378                 err(1, "error creating Netlink socket\n");
379 
380 
381         mypid = getpid();
382         id = get_family_id(nl_sd);
383         if (!id) {
384                 fprintf(stderr, "Error getting family id, errno %d\n", errno);
385                 goto err;
386         }
387         PRINTF("family id %d\n", id);
388 
389         if (maskset) {
390                 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
391                               TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
392                               &cpumask, strlen(cpumask) + 1);
393                 PRINTF("Sent register cpumask, retval %d\n", rc);
394                 if (rc < 0) {
395                         fprintf(stderr, "error sending register cpumask\n");
396                         goto err;
397                 }
398         }
399 
400         if (tid && containerset) {
401                 fprintf(stderr, "Select either -t or -C, not both\n");
402                 goto err;
403         }
404 
405         /*
406          * If we forked a child, wait for it to exit. Cannot use waitpid()
407          * as all the delicious data would be reaped as part of the wait
408          */
409         if (tid && forking) {
410                 int sig_received;
411                 sigwait(&sigset, &sig_received);
412         }
413 
414         if (tid) {
415                 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
416                               cmd_type, &tid, sizeof(__u32));
417                 PRINTF("Sent pid/tgid, retval %d\n", rc);
418                 if (rc < 0) {
419                         fprintf(stderr, "error sending tid/tgid cmd\n");
420                         goto done;
421                 }
422         }
423 
424         if (containerset) {
425                 cfd = open(containerpath, O_RDONLY);
426                 if (cfd < 0) {
427                         perror("error opening container file");
428                         goto err;
429                 }
430                 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
431                               CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
432                 if (rc < 0) {
433                         perror("error sending cgroupstats command");
434                         goto err;
435                 }
436         }
437         if (!maskset && !tid && !containerset) {
438                 usage();
439                 goto err;
440         }
441 
442         do {
443                 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
444                 PRINTF("received %d bytes\n", rep_len);
445 
446                 if (rep_len < 0) {
447                         fprintf(stderr, "nonfatal reply error: errno %d\n",
448                                 errno);
449                         continue;
450                 }
451                 if (msg.n.nlmsg_type == NLMSG_ERROR ||
452                     !NLMSG_OK((&msg.n), rep_len)) {
453                         struct nlmsgerr *err = NLMSG_DATA(&msg);
454                         fprintf(stderr, "fatal reply error,  errno %d\n",
455                                 err->error);
456                         goto done;
457                 }
458 
459                 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
460                        sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
461 
462 
463                 rep_len = GENLMSG_PAYLOAD(&msg.n);
464 
465                 na = (struct nlattr *) GENLMSG_DATA(&msg);
466                 len = 0;
467                 while (len < rep_len) {
468                         len += NLA_ALIGN(na->nla_len);
469                         switch (na->nla_type) {
470                         case TASKSTATS_TYPE_AGGR_TGID:
471                                 /* Fall through */
472                         case TASKSTATS_TYPE_AGGR_PID:
473                                 aggr_len = NLA_PAYLOAD(na->nla_len);
474                                 len2 = 0;
475                                 /* For nested attributes, na follows */
476                                 na = (struct nlattr *) NLA_DATA(na);
477                                 done = 0;
478                                 while (len2 < aggr_len) {
479                                         switch (na->nla_type) {
480                                         case TASKSTATS_TYPE_PID:
481                                                 rtid = *(int *) NLA_DATA(na);
482                                                 if (print_delays)
483                                                         printf("PID\t%d\n", rtid);
484                                                 break;
485                                         case TASKSTATS_TYPE_TGID:
486                                                 rtid = *(int *) NLA_DATA(na);
487                                                 if (print_delays)
488                                                         printf("TGID\t%d\n", rtid);
489                                                 break;
490                                         case TASKSTATS_TYPE_STATS:
491                                                 count++;
492                                                 if (print_delays)
493                                                         print_delayacct((struct taskstats *) NLA_DATA(na));
494                                                 if (print_io_accounting)
495                                                         print_ioacct((struct taskstats *) NLA_DATA(na));
496                                                 if (print_task_context_switch_counts)
497                                                         task_context_switch_counts((struct taskstats *) NLA_DATA(na));
498                                                 if (fd) {
499                                                         if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
500                                                                 err(1,"write error\n");
501                                                         }
502                                                 }
503                                                 if (!loop)
504                                                         goto done;
505                                                 break;
506                                         default:
507                                                 fprintf(stderr, "Unknown nested"
508                                                         " nla_type %d\n",
509                                                         na->nla_type);
510                                                 break;
511                                         }
512                                         len2 += NLA_ALIGN(na->nla_len);
513                                         na = (struct nlattr *) ((char *) na + len2);
514                                 }
515                                 break;
516 
517                         case CGROUPSTATS_TYPE_CGROUP_STATS:
518                                 print_cgroupstats(NLA_DATA(na));
519                                 break;
520                         default:
521                                 fprintf(stderr, "Unknown nla_type %d\n",
522                                         na->nla_type);
523                         case TASKSTATS_TYPE_NULL:
524                                 break;
525                         }
526                         na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
527                 }
528         } while (loop);
529 done:
530         if (maskset) {
531                 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
532                               TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
533                               &cpumask, strlen(cpumask) + 1);
534                 printf("Sent deregister mask, retval %d\n", rc);
535                 if (rc < 0)
536                         err(rc, "error sending deregister cpumask\n");
537         }
538 err:
539         close(nl_sd);
540         if (fd)
541                 close(fd);
542         if (cfd)
543                 close(cfd);
544         return 0;
545 }
546 

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