1 // SPDX-License-Identifier: GPL-2.0
4 * Utility to get per-pid and per-tgid delay accounting statistics
5 * Also illustrates usage of the taskstats interface
7 * Copyright (C) Shailabh Nagar, IBM Corp. 2005
8 * Copyright (C) Balbir Singh, IBM Corp. 2006
9 * Copyright (c) Jay Lan, SGI. 2006
12 * gcc -I/usr/src/linux/include getdelays.c -o getdelays
22 #include <sys/types.h>
24 #include <sys/socket.h>
28 #include <linux/genetlink.h>
29 #include <linux/taskstats.h>
30 #include <linux/cgroupstats.h>
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
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)
42 #define err(code, fmt, arg...) \
44 fprintf(stderr, fmt, ##arg); \
52 int print_io_accounting
;
53 int print_task_context_switch_counts
;
55 #define PRINTF(fmt, arg...) { \
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 */
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");
82 fprintf(stderr
, " -C: container path\n");
86 * Create a raw netlink socket and bind
88 static int create_nl_socket(int protocol
)
91 struct sockaddr_nl local
;
93 fd
= socket(AF_NETLINK
, SOCK_RAW
, protocol
);
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",
105 memset(&local
, 0, sizeof(local
));
106 local
.nl_family
= AF_NETLINK
;
108 if (bind(fd
, (struct sockaddr
*) &local
, sizeof(local
)) < 0)
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
)
123 struct sockaddr_nl nladdr
;
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
;
133 msg
.n
.nlmsg_pid
= nlmsg_pid
;
134 msg
.g
.cmd
= genl_cmd
;
136 na
= (struct nlattr
*) GENLMSG_DATA(&msg
);
137 na
->nla_type
= nla_type
;
138 na
->nla_len
= nla_len
+ NLA_HDRLEN
;
139 memcpy(NLA_DATA(na
), nla_data
, nla_len
);
140 msg
.n
.nlmsg_len
+= NLMSG_ALIGN(na
->nla_len
);
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
) {
151 } else if (errno
!= EAGAIN
)
159 * Probe the controller in genetlink to find the family id
160 * for the TASKSTATS family
162 static int get_family_id(int sd
)
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 return 0; /* sendto() failure? */
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
))
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
);
194 #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
196 static void print_delayacct(struct taskstats
*t
)
198 printf("\n\nCPU %15s%15s%15s%15s%15s\n"
199 " %15llu%15llu%15llu%15llu%15.3fms\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 "THRASHING%12s%15s%15s\n"
207 " %15llu%15llu%15llums\n"
208 "COMPACT %12s%15s%15s\n"
209 " %15llu%15llu%15llums\n"
210 "WPCOPY %12s%15s%15s\n"
211 " %15llu%15llu%15llums\n",
212 "count", "real total", "virtual total",
213 "delay total", "delay average",
214 (unsigned long long)t
->cpu_count
,
215 (unsigned long long)t
->cpu_run_real_total
,
216 (unsigned long long)t
->cpu_run_virtual_total
,
217 (unsigned long long)t
->cpu_delay_total
,
218 average_ms((double)t
->cpu_delay_total
, t
->cpu_count
),
219 "count", "delay total", "delay average",
220 (unsigned long long)t
->blkio_count
,
221 (unsigned long long)t
->blkio_delay_total
,
222 average_ms(t
->blkio_delay_total
, t
->blkio_count
),
223 "count", "delay total", "delay average",
224 (unsigned long long)t
->swapin_count
,
225 (unsigned long long)t
->swapin_delay_total
,
226 average_ms(t
->swapin_delay_total
, t
->swapin_count
),
227 "count", "delay total", "delay average",
228 (unsigned long long)t
->freepages_count
,
229 (unsigned long long)t
->freepages_delay_total
,
230 average_ms(t
->freepages_delay_total
, t
->freepages_count
),
231 "count", "delay total", "delay average",
232 (unsigned long long)t
->thrashing_count
,
233 (unsigned long long)t
->thrashing_delay_total
,
234 average_ms(t
->thrashing_delay_total
, t
->thrashing_count
),
235 "count", "delay total", "delay average",
236 (unsigned long long)t
->compact_count
,
237 (unsigned long long)t
->compact_delay_total
,
238 average_ms(t
->compact_delay_total
, t
->compact_count
),
239 "count", "delay total", "delay average",
240 (unsigned long long)t
->wpcopy_count
,
241 (unsigned long long)t
->wpcopy_delay_total
,
242 average_ms(t
->wpcopy_delay_total
, t
->wpcopy_count
));
245 static void task_context_switch_counts(struct taskstats
*t
)
247 printf("\n\nTask %15s%15s\n"
249 "voluntary", "nonvoluntary",
250 (unsigned long long)t
->nvcsw
, (unsigned long long)t
->nivcsw
);
253 static void print_cgroupstats(struct cgroupstats
*c
)
255 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
256 "uninterruptible %llu\n", (unsigned long long)c
->nr_sleeping
,
257 (unsigned long long)c
->nr_io_wait
,
258 (unsigned long long)c
->nr_running
,
259 (unsigned long long)c
->nr_stopped
,
260 (unsigned long long)c
->nr_uninterruptible
);
264 static void print_ioacct(struct taskstats
*t
)
266 printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
268 (unsigned long long)t
->read_bytes
,
269 (unsigned long long)t
->write_bytes
,
270 (unsigned long long)t
->cancelled_write_bytes
);
273 int main(int argc
, char *argv
[])
275 int c
, rc
, rep_len
, aggr_len
, len2
;
276 int cmd_type
= TASKSTATS_CMD_ATTR_UNSPEC
;
289 char *logfile
= NULL
;
291 int containerset
= 0;
292 char *containerpath
= NULL
;
297 struct msgtemplate msg
;
300 c
= getopt(argc
, argv
, "qdiw:r:m:t:p:vlC:c:");
306 printf("print delayacct stats ON\n");
310 printf("printing IO accounting\n");
311 print_io_accounting
= 1;
314 printf("printing task/process context switch rates\n");
315 print_task_context_switch_counts
= 1;
319 containerpath
= optarg
;
322 logfile
= strdup(optarg
);
323 printf("write to file %s\n", logfile
);
327 rcvbufsz
= atoi(optarg
);
328 printf("receive buf size %d\n", rcvbufsz
);
330 err(1, "Invalid rcv buf size\n");
333 strncpy(cpumask
, optarg
, sizeof(cpumask
));
334 cpumask
[sizeof(cpumask
) - 1] = '\0';
336 printf("cpumask %s maskset %d\n", cpumask
, maskset
);
341 err(1, "Invalid tgid\n");
342 cmd_type
= TASKSTATS_CMD_ATTR_TGID
;
347 err(1, "Invalid pid\n");
348 cmd_type
= TASKSTATS_CMD_ATTR_PID
;
352 /* Block SIGCHLD for sigwait() later */
353 if (sigemptyset(&sigset
) == -1)
354 err(1, "Failed to empty sigset");
355 if (sigaddset(&sigset
, SIGCHLD
))
356 err(1, "Failed to set sigchld in sigset");
357 sigprocmask(SIG_BLOCK
, &sigset
, NULL
);
359 /* fork/exec a child */
362 err(1, "Fork failed\n");
364 if (execvp(argv
[optind
- 1],
365 &argv
[optind
- 1]) < 0)
368 /* Set the command type and avoid further processing */
369 cmd_type
= TASKSTATS_CMD_ATTR_PID
;
373 printf("debug on\n");
377 printf("listen forever\n");
387 fd
= open(logfile
, O_WRONLY
| O_CREAT
| O_TRUNC
,
388 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IROTH
);
390 perror("Cannot open output file\n");
395 nl_sd
= create_nl_socket(NETLINK_GENERIC
);
397 err(1, "error creating Netlink socket\n");
401 id
= get_family_id(nl_sd
);
403 fprintf(stderr
, "Error getting family id, errno %d\n", errno
);
406 PRINTF("family id %d\n", id
);
409 rc
= send_cmd(nl_sd
, id
, mypid
, TASKSTATS_CMD_GET
,
410 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK
,
411 &cpumask
, strlen(cpumask
) + 1);
412 PRINTF("Sent register cpumask, retval %d\n", rc
);
414 fprintf(stderr
, "error sending register cpumask\n");
419 if (tid
&& containerset
) {
420 fprintf(stderr
, "Select either -t or -C, not both\n");
425 * If we forked a child, wait for it to exit. Cannot use waitpid()
426 * as all the delicious data would be reaped as part of the wait
428 if (tid
&& forking
) {
430 sigwait(&sigset
, &sig_received
);
434 rc
= send_cmd(nl_sd
, id
, mypid
, TASKSTATS_CMD_GET
,
435 cmd_type
, &tid
, sizeof(__u32
));
436 PRINTF("Sent pid/tgid, retval %d\n", rc
);
438 fprintf(stderr
, "error sending tid/tgid cmd\n");
444 cfd
= open(containerpath
, O_RDONLY
);
446 perror("error opening container file");
449 rc
= send_cmd(nl_sd
, id
, mypid
, CGROUPSTATS_CMD_GET
,
450 CGROUPSTATS_CMD_ATTR_FD
, &cfd
, sizeof(__u32
));
452 perror("error sending cgroupstats command");
456 if (!maskset
&& !tid
&& !containerset
) {
462 rep_len
= recv(nl_sd
, &msg
, sizeof(msg
), 0);
463 PRINTF("received %d bytes\n", rep_len
);
466 fprintf(stderr
, "nonfatal reply error: errno %d\n",
470 if (msg
.n
.nlmsg_type
== NLMSG_ERROR
||
471 !NLMSG_OK((&msg
.n
), rep_len
)) {
472 struct nlmsgerr
*err
= NLMSG_DATA(&msg
);
473 fprintf(stderr
, "fatal reply error, errno %d\n",
478 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
479 sizeof(struct nlmsghdr
), msg
.n
.nlmsg_len
, rep_len
);
482 rep_len
= GENLMSG_PAYLOAD(&msg
.n
);
484 na
= (struct nlattr
*) GENLMSG_DATA(&msg
);
486 while (len
< rep_len
) {
487 len
+= NLA_ALIGN(na
->nla_len
);
488 switch (na
->nla_type
) {
489 case TASKSTATS_TYPE_AGGR_TGID
:
491 case TASKSTATS_TYPE_AGGR_PID
:
492 aggr_len
= NLA_PAYLOAD(na
->nla_len
);
494 /* For nested attributes, na follows */
495 na
= (struct nlattr
*) NLA_DATA(na
);
496 while (len2
< aggr_len
) {
497 switch (na
->nla_type
) {
498 case TASKSTATS_TYPE_PID
:
499 rtid
= *(int *) NLA_DATA(na
);
501 printf("PID\t%d\n", rtid
);
503 case TASKSTATS_TYPE_TGID
:
504 rtid
= *(int *) NLA_DATA(na
);
506 printf("TGID\t%d\n", rtid
);
508 case TASKSTATS_TYPE_STATS
:
510 print_delayacct((struct taskstats
*) NLA_DATA(na
));
511 if (print_io_accounting
)
512 print_ioacct((struct taskstats
*) NLA_DATA(na
));
513 if (print_task_context_switch_counts
)
514 task_context_switch_counts((struct taskstats
*) NLA_DATA(na
));
516 if (write(fd
, NLA_DATA(na
), na
->nla_len
) < 0) {
517 err(1,"write error\n");
523 case TASKSTATS_TYPE_NULL
:
526 fprintf(stderr
, "Unknown nested"
531 len2
+= NLA_ALIGN(na
->nla_len
);
532 na
= (struct nlattr
*)((char *)na
+
533 NLA_ALIGN(na
->nla_len
));
537 case CGROUPSTATS_TYPE_CGROUP_STATS
:
538 print_cgroupstats(NLA_DATA(na
));
541 fprintf(stderr
, "Unknown nla_type %d\n",
543 case TASKSTATS_TYPE_NULL
:
546 na
= (struct nlattr
*) (GENLMSG_DATA(&msg
) + len
);
551 rc
= send_cmd(nl_sd
, id
, mypid
, TASKSTATS_CMD_GET
,
552 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK
,
553 &cpumask
, strlen(cpumask
) + 1);
554 printf("Sent deregister mask, retval %d\n", rc
);
556 err(rc
, "error sending deregister cpumask\n");