~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.15-rc1 ] ~ [ linux-5.14.5 ] ~ [ linux-5.13.18 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.66 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.147 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.206 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.246 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.282 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.283 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /* getdelays.c
  3  *
  4  * Utility to get per-pid and per-tgid delay accounting statistics
  5  * Also illustrates usage of the taskstats interface
  6  *
  7  * Copyright (C) Shailabh Nagar, IBM Corp. 2005
  8  * Copyright (C) Balbir Singh, IBM Corp. 2006
  9  * Copyright (c) Jay Lan, SGI. 2006
 10  *
 11  * Compile with
 12  *      gcc -I/usr/src/linux/include getdelays.c -o getdelays
 13  */
 14 
 15 #include <stdio.h>
 16 #include <stdlib.h>
 17 #include <errno.h>
 18 #include <unistd.h>
 19 #include <poll.h>
 20 #include <string.h>
 21 #include <fcntl.h>
 22 #include <sys/types.h>
 23 #include <sys/stat.h>
 24 #include <sys/socket.h>
 25 #include <sys/wait.h>
 26 #include <signal.h>
 27 
 28 #include <linux/genetlink.h>
 29 #include <linux/taskstats.h>
 30 #include <linux/cgroupstats.h>
 31 
 32 /*
 33  * Generic macros for dealing with netlink sockets. Might be duplicated
 34  * elsewhere. It is recommended that commercial grade applications use
 35  * libnl or libnetlink and use the interfaces provided by the library
 36  */
 37 #define GENLMSG_DATA(glh)       ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
 38 #define GENLMSG_PAYLOAD(glh)    (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
 39 #define NLA_DATA(na)            ((void *)((char*)(na) + NLA_HDRLEN))
 40 #define NLA_PAYLOAD(len)        (len - NLA_HDRLEN)
 41 
 42 #define err(code, fmt, arg...)                  \
 43         do {                                    \
 44                 fprintf(stderr, fmt, ##arg);    \
 45                 exit(code);                     \
 46         } while (0)
 47 
 48 int done;
 49 int rcvbufsz;
 50 char name[100];
 51 int dbg;
 52 int print_delays;
 53 int print_io_accounting;
 54 int print_task_context_switch_counts;
 55 
 56 #define PRINTF(fmt, arg...) {                   \
 57             if (dbg) {                          \
 58                 printf(fmt, ##arg);             \
 59             }                                   \
 60         }
 61 
 62 /* Maximum size of response requested or message sent */
 63 #define MAX_MSG_SIZE    1024
 64 /* Maximum number of cpus expected to be specified in a cpumask */
 65 #define MAX_CPUS        32
 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];
 74 
 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         fprintf(stderr, "  -C: container path\n");
 84 }
 85 
 86 /*
 87  * Create a raw netlink socket and bind
 88  */
 89 static int create_nl_socket(int protocol)
 90 {
 91         int fd;
 92         struct sockaddr_nl local;
 93 
 94         fd = socket(AF_NETLINK, SOCK_RAW, protocol);
 95         if (fd < 0)
 96                 return -1;
 97 
 98         if (rcvbufsz)
 99                 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
100                                 &rcvbufsz, sizeof(rcvbufsz)) < 0) {
101                         fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
102                                 rcvbufsz);
103                         goto error;
104                 }
105 
106         memset(&local, 0, sizeof(local));
107         local.nl_family = AF_NETLINK;
108 
109         if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
110                 goto error;
111 
112         return fd;
113 error:
114         close(fd);
115         return -1;
116 }
117 
118 
119 static 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)
122 {
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 + 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;
156 }
157 
158 
159 /*
160  * Probe the controller in genetlink to find the family id
161  * for the TASKSTATS family
162  */
163 static int get_family_id(int sd)
164 {
165         struct {
166                 struct nlmsghdr n;
167                 struct genlmsghdr g;
168                 char buf[256];
169         } ans;
170 
171         int id = 0, 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         if (rc < 0)
180                 return 0;       /* sendto() failure? */
181 
182         rep_len = recv(sd, &ans, sizeof(ans), 0);
183         if (ans.n.nlmsg_type == NLMSG_ERROR ||
184             (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
185                 return 0;
186 
187         na = (struct nlattr *) GENLMSG_DATA(&ans);
188         na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
189         if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
190                 id = *(__u16 *) NLA_DATA(na);
191         }
192         return id;
193 }
194 
195 #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
196 
197 static void print_delayacct(struct taskstats *t)
198 {
199         printf("\n\nCPU   %15s%15s%15s%15s%15s\n"
200                "      %15llu%15llu%15llu%15llu%15.3fms\n"
201                "IO    %15s%15s%15s\n"
202                "      %15llu%15llu%15llums\n"
203                "SWAP  %15s%15s%15s\n"
204                "      %15llu%15llu%15llums\n"
205                "RECLAIM  %12s%15s%15s\n"
206                "      %15llu%15llu%15llums\n"
207                "THRASHING%12s%15s%15s\n"
208                "      %15llu%15llu%15llums\n",
209                "count", "real total", "virtual total",
210                "delay total", "delay average",
211                (unsigned long long)t->cpu_count,
212                (unsigned long long)t->cpu_run_real_total,
213                (unsigned long long)t->cpu_run_virtual_total,
214                (unsigned long long)t->cpu_delay_total,
215                average_ms((double)t->cpu_delay_total, t->cpu_count),
216                "count", "delay total", "delay average",
217                (unsigned long long)t->blkio_count,
218                (unsigned long long)t->blkio_delay_total,
219                average_ms(t->blkio_delay_total, t->blkio_count),
220                "count", "delay total", "delay average",
221                (unsigned long long)t->swapin_count,
222                (unsigned long long)t->swapin_delay_total,
223                average_ms(t->swapin_delay_total, t->swapin_count),
224                "count", "delay total", "delay average",
225                (unsigned long long)t->freepages_count,
226                (unsigned long long)t->freepages_delay_total,
227                average_ms(t->freepages_delay_total, t->freepages_count),
228                "count", "delay total", "delay average",
229                (unsigned long long)t->thrashing_count,
230                (unsigned long long)t->thrashing_delay_total,
231                average_ms(t->thrashing_delay_total, t->thrashing_count));
232 }
233 
234 static void task_context_switch_counts(struct taskstats *t)
235 {
236         printf("\n\nTask   %15s%15s\n"
237                "       %15llu%15llu\n",
238                "voluntary", "nonvoluntary",
239                (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
240 }
241 
242 static void print_cgroupstats(struct cgroupstats *c)
243 {
244         printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
245                 "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
246                 (unsigned long long)c->nr_io_wait,
247                 (unsigned long long)c->nr_running,
248                 (unsigned long long)c->nr_stopped,
249                 (unsigned long long)c->nr_uninterruptible);
250 }
251 
252 
253 static void print_ioacct(struct taskstats *t)
254 {
255         printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
256                 t->ac_comm,
257                 (unsigned long long)t->read_bytes,
258                 (unsigned long long)t->write_bytes,
259                 (unsigned long long)t->cancelled_write_bytes);
260 }
261 
262 int main(int argc, char *argv[])
263 {
264         int c, rc, rep_len, aggr_len, len2;
265         int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
266         __u16 id;
267         __u32 mypid;
268 
269         struct nlattr *na;
270         int nl_sd = -1;
271         int len = 0;
272         pid_t tid = 0;
273         pid_t rtid = 0;
274 
275         int fd = 0;
276         int count = 0;
277         int write_file = 0;
278         int maskset = 0;
279         char *logfile = NULL;
280         int loop = 0;
281         int containerset = 0;
282         char *containerpath = NULL;
283         int cfd = 0;
284         int forking = 0;
285         sigset_t sigset;
286 
287         struct msgtemplate msg;
288 
289         while (!forking) {
290                 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
291                 if (c < 0)
292                         break;
293 
294                 switch (c) {
295                 case 'd':
296                         printf("print delayacct stats ON\n");
297                         print_delays = 1;
298                         break;
299                 case 'i':
300                         printf("printing IO accounting\n");
301                         print_io_accounting = 1;
302                         break;
303                 case 'q':
304                         printf("printing task/process context switch rates\n");
305                         print_task_context_switch_counts = 1;
306                         break;
307                 case 'C':
308                         containerset = 1;
309                         containerpath = optarg;
310                         break;
311                 case 'w':
312                         logfile = strdup(optarg);
313                         printf("write to file %s\n", logfile);
314                         write_file = 1;
315                         break;
316                 case 'r':
317                         rcvbufsz = atoi(optarg);
318                         printf("receive buf size %d\n", rcvbufsz);
319                         if (rcvbufsz < 0)
320                                 err(1, "Invalid rcv buf size\n");
321                         break;
322                 case 'm':
323                         strncpy(cpumask, optarg, sizeof(cpumask));
324                         cpumask[sizeof(cpumask) - 1] = '\0';
325                         maskset = 1;
326                         printf("cpumask %s maskset %d\n", cpumask, maskset);
327                         break;
328                 case 't':
329                         tid = atoi(optarg);
330                         if (!tid)
331                                 err(1, "Invalid tgid\n");
332                         cmd_type = TASKSTATS_CMD_ATTR_TGID;
333                         break;
334                 case 'p':
335                         tid = atoi(optarg);
336                         if (!tid)
337                                 err(1, "Invalid pid\n");
338                         cmd_type = TASKSTATS_CMD_ATTR_PID;
339                         break;
340                 case 'c':
341 
342                         /* Block SIGCHLD for sigwait() later */
343                         if (sigemptyset(&sigset) == -1)
344                                 err(1, "Failed to empty sigset");
345                         if (sigaddset(&sigset, SIGCHLD))
346                                 err(1, "Failed to set sigchld in sigset");
347                         sigprocmask(SIG_BLOCK, &sigset, NULL);
348 
349                         /* fork/exec a child */
350                         tid = fork();
351                         if (tid < 0)
352                                 err(1, "Fork failed\n");
353                         if (tid == 0)
354                                 if (execvp(argv[optind - 1],
355                                     &argv[optind - 1]) < 0)
356                                         exit(-1);
357 
358                         /* Set the command type and avoid further processing */
359                         cmd_type = TASKSTATS_CMD_ATTR_PID;
360                         forking = 1;
361                         break;
362                 case 'v':
363                         printf("debug on\n");
364                         dbg = 1;
365                         break;
366                 case 'l':
367                         printf("listen forever\n");
368                         loop = 1;
369                         break;
370                 default:
371                         usage();
372                         exit(-1);
373                 }
374         }
375 
376         if (write_file) {
377                 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
378                           S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
379                 if (fd == -1) {
380                         perror("Cannot open output file\n");
381                         exit(1);
382                 }
383         }
384 
385         nl_sd = create_nl_socket(NETLINK_GENERIC);
386         if (nl_sd < 0)
387                 err(1, "error creating Netlink socket\n");
388 
389 
390         mypid = getpid();
391         id = get_family_id(nl_sd);
392         if (!id) {
393                 fprintf(stderr, "Error getting family id, errno %d\n", errno);
394                 goto err;
395         }
396         PRINTF("family id %d\n", id);
397 
398         if (maskset) {
399                 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
400                               TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
401                               &cpumask, strlen(cpumask) + 1);
402                 PRINTF("Sent register cpumask, retval %d\n", rc);
403                 if (rc < 0) {
404                         fprintf(stderr, "error sending register cpumask\n");
405                         goto err;
406                 }
407         }
408 
409         if (tid && containerset) {
410                 fprintf(stderr, "Select either -t or -C, not both\n");
411                 goto err;
412         }
413 
414         /*
415          * If we forked a child, wait for it to exit. Cannot use waitpid()
416          * as all the delicious data would be reaped as part of the wait
417          */
418         if (tid && forking) {
419                 int sig_received;
420                 sigwait(&sigset, &sig_received);
421         }
422 
423         if (tid) {
424                 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
425                               cmd_type, &tid, sizeof(__u32));
426                 PRINTF("Sent pid/tgid, retval %d\n", rc);
427                 if (rc < 0) {
428                         fprintf(stderr, "error sending tid/tgid cmd\n");
429                         goto done;
430                 }
431         }
432 
433         if (containerset) {
434                 cfd = open(containerpath, O_RDONLY);
435                 if (cfd < 0) {
436                         perror("error opening container file");
437                         goto err;
438                 }
439                 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
440                               CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
441                 if (rc < 0) {
442                         perror("error sending cgroupstats command");
443                         goto err;
444                 }
445         }
446         if (!maskset && !tid && !containerset) {
447                 usage();
448                 goto err;
449         }
450 
451         do {
452                 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
453                 PRINTF("received %d bytes\n", rep_len);
454 
455                 if (rep_len < 0) {
456                         fprintf(stderr, "nonfatal reply error: errno %d\n",
457                                 errno);
458                         continue;
459                 }
460                 if (msg.n.nlmsg_type == NLMSG_ERROR ||
461                     !NLMSG_OK((&msg.n), rep_len)) {
462                         struct nlmsgerr *err = NLMSG_DATA(&msg);
463                         fprintf(stderr, "fatal reply error,  errno %d\n",
464                                 err->error);
465                         goto done;
466                 }
467 
468                 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
469                        sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
470 
471 
472                 rep_len = GENLMSG_PAYLOAD(&msg.n);
473 
474                 na = (struct nlattr *) GENLMSG_DATA(&msg);
475                 len = 0;
476                 while (len < rep_len) {
477                         len += NLA_ALIGN(na->nla_len);
478                         switch (na->nla_type) {
479                         case TASKSTATS_TYPE_AGGR_TGID:
480                                 /* Fall through */
481                         case TASKSTATS_TYPE_AGGR_PID:
482                                 aggr_len = NLA_PAYLOAD(na->nla_len);
483                                 len2 = 0;
484                                 /* For nested attributes, na follows */
485                                 na = (struct nlattr *) NLA_DATA(na);
486                                 done = 0;
487                                 while (len2 < aggr_len) {
488                                         switch (na->nla_type) {
489                                         case TASKSTATS_TYPE_PID:
490                                                 rtid = *(int *) NLA_DATA(na);
491                                                 if (print_delays)
492                                                         printf("PID\t%d\n", rtid);
493                                                 break;
494                                         case TASKSTATS_TYPE_TGID:
495                                                 rtid = *(int *) NLA_DATA(na);
496                                                 if (print_delays)
497                                                         printf("TGID\t%d\n", rtid);
498                                                 break;
499                                         case TASKSTATS_TYPE_STATS:
500                                                 count++;
501                                                 if (print_delays)
502                                                         print_delayacct((struct taskstats *) NLA_DATA(na));
503                                                 if (print_io_accounting)
504                                                         print_ioacct((struct taskstats *) NLA_DATA(na));
505                                                 if (print_task_context_switch_counts)
506                                                         task_context_switch_counts((struct taskstats *) NLA_DATA(na));
507                                                 if (fd) {
508                                                         if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
509                                                                 err(1,"write error\n");
510                                                         }
511                                                 }
512                                                 if (!loop)
513                                                         goto done;
514                                                 break;
515                                         case TASKSTATS_TYPE_NULL:
516                                                 break;
517                                         default:
518                                                 fprintf(stderr, "Unknown nested"
519                                                         " nla_type %d\n",
520                                                         na->nla_type);
521                                                 break;
522                                         }
523                                         len2 += NLA_ALIGN(na->nla_len);
524                                         na = (struct nlattr *)((char *)na +
525                                                                NLA_ALIGN(na->nla_len));
526                                 }
527                                 break;
528 
529                         case CGROUPSTATS_TYPE_CGROUP_STATS:
530                                 print_cgroupstats(NLA_DATA(na));
531                                 break;
532                         default:
533                                 fprintf(stderr, "Unknown nla_type %d\n",
534                                         na->nla_type);
535                         case TASKSTATS_TYPE_NULL:
536                                 break;
537                         }
538                         na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
539                 }
540         } while (loop);
541 done:
542         if (maskset) {
543                 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
544                               TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
545                               &cpumask, strlen(cpumask) + 1);
546                 printf("Sent deregister mask, retval %d\n", rc);
547                 if (rc < 0)
548                         err(rc, "error sending deregister cpumask\n");
549         }
550 err:
551         close(nl_sd);
552         if (fd)
553                 close(fd);
554         if (cfd)
555                 close(cfd);
556         return 0;
557 }
558 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp