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Shailabh Nagara3baf642006-07-14 00:24:42 -07001/* 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
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -07008 * Copyright (c) Jay Lan, SGI. 2006
Shailabh Nagara3baf642006-07-14 00:24:42 -07009 *
Andrew Mortond2f7bf12006-12-10 02:19:55 -080010 * Compile with
11 * gcc -I/usr/src/linux/include getdelays.c -o getdelays
Shailabh Nagara3baf642006-07-14 00:24:42 -070012 */
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>
Mel Gormandb9e5672010-10-27 15:34:42 -070024#include <sys/wait.h>
Shailabh Nagara3baf642006-07-14 00:24:42 -070025#include <signal.h>
26
27#include <linux/genetlink.h>
28#include <linux/taskstats.h>
Balbir Singh546040d2007-11-14 16:59:14 -080029#include <linux/cgroupstats.h>
Shailabh Nagara3baf642006-07-14 00:24:42 -070030
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
Andrew Mortond2f7bf12006-12-10 02:19:55 -080041#define err(code, fmt, arg...) \
42 do { \
43 fprintf(stderr, fmt, ##arg); \
44 exit(code); \
45 } while (0)
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -070046
Andrew Mortond2f7bf12006-12-10 02:19:55 -080047int done;
48int rcvbufsz;
49char name[100];
50int dbg;
51int print_delays;
Andrew Mortoncf709842006-12-10 02:19:56 -080052int print_io_accounting;
Maxim Uvarovb663a792007-07-15 23:40:48 -070053int print_task_context_switch_counts;
Andrew Mortond2f7bf12006-12-10 02:19:55 -080054
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -070055#define PRINTF(fmt, arg...) { \
56 if (dbg) { \
57 printf(fmt, ##arg); \
58 } \
59 }
60
61/* Maximum size of response requested or message sent */
Oleg Nesterov88040232006-11-02 22:07:26 -080062#define MAX_MSG_SIZE 1024
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -070063/* Maximum number of cpus expected to be specified in a cpumask */
64#define MAX_CPUS 32
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -070065
66struct msgtemplate {
67 struct nlmsghdr n;
68 struct genlmsghdr g;
69 char buf[MAX_MSG_SIZE];
70};
71
72char cpumask[100+6*MAX_CPUS];
Shailabh Nagara3baf642006-07-14 00:24:42 -070073
Randy Dunlapf16825b2007-05-08 00:30:13 -070074static 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");
Balbir Singh546040d2007-11-14 16:59:14 -080082 fprintf(stderr, " -C: container path\n");
Randy Dunlapf16825b2007-05-08 00:30:13 -070083}
84
Shailabh Nagara3baf642006-07-14 00:24:42 -070085/*
86 * Create a raw netlink socket and bind
87 */
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -070088static int create_nl_socket(int protocol)
Shailabh Nagara3baf642006-07-14 00:24:42 -070089{
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -070090 int fd;
91 struct sockaddr_nl local;
Shailabh Nagara3baf642006-07-14 00:24:42 -070092
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -070093 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) {
Jesper Juhl0de4b952012-08-08 20:56:14 +0200100 fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800101 rcvbufsz);
Jesper Juhl0de4b952012-08-08 20:56:14 +0200102 goto error;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700103 }
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;
112error:
113 close(fd);
Shailabh Nagara3baf642006-07-14 00:24:42 -0700114 return -1;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700115}
116
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700117
Ladinu Chandrasingheb7ed6982009-09-22 16:43:42 -0700118static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700119 __u8 genl_cmd, __u16 nla_type,
120 void *nla_data, int nla_len)
Shailabh Nagara3baf642006-07-14 00:24:42 -0700121{
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700122 struct nlattr *na;
123 struct sockaddr_nl nladdr;
124 int r, buflen;
125 char *buf;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700126
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700127 struct msgtemplate msg;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700128
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700129 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;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700155}
156
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700157
Shailabh Nagara3baf642006-07-14 00:24:42 -0700158/*
159 * Probe the controller in genetlink to find the family id
160 * for the TASKSTATS family
161 */
Ladinu Chandrasingheb7ed6982009-09-22 16:43:42 -0700162static int get_family_id(int sd)
Shailabh Nagara3baf642006-07-14 00:24:42 -0700163{
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700164 struct {
165 struct nlmsghdr n;
166 struct genlmsghdr g;
167 char buf[256];
168 } ans;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700169
Randy Dunlap10e6f322008-02-08 04:21:56 -0800170 int id = 0, rc;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700171 struct nlattr *na;
172 int rep_len;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700173
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700174 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);
Andrew Morton4ed960b2011-05-26 16:25:15 -0700178 if (rc < 0)
179 return 0; /* sendto() failure? */
Shailabh Nagara3baf642006-07-14 00:24:42 -0700180
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700181 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;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700185
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700186 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;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700192}
193
Wu Fengguang02d54f02011-05-26 16:25:16 -0700194#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
195
Ladinu Chandrasingheb7ed6982009-09-22 16:43:42 -0700196static void print_delayacct(struct taskstats *t)
Shailabh Nagara3baf642006-07-14 00:24:42 -0700197{
Wu Fengguang02d54f02011-05-26 16:25:16 -0700198 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",
Randy Dunlap66659312008-08-12 15:09:10 -0700208 (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,
Wu Fengguang02d54f02011-05-26 16:25:16 -0700212 average_ms((double)t->cpu_delay_total, t->cpu_count),
213 "count", "delay total", "delay average",
Randy Dunlap66659312008-08-12 15:09:10 -0700214 (unsigned long long)t->blkio_count,
215 (unsigned long long)t->blkio_delay_total,
Wu Fengguang02d54f02011-05-26 16:25:16 -0700216 average_ms(t->blkio_delay_total, t->blkio_count),
217 "count", "delay total", "delay average",
Randy Dunlap66659312008-08-12 15:09:10 -0700218 (unsigned long long)t->swapin_count,
219 (unsigned long long)t->swapin_delay_total,
Wu Fengguang02d54f02011-05-26 16:25:16 -0700220 average_ms(t->swapin_delay_total, t->swapin_count),
221 "count", "delay total", "delay average",
Randy Dunlap66659312008-08-12 15:09:10 -0700222 (unsigned long long)t->freepages_count,
Wu Fengguang02d54f02011-05-26 16:25:16 -0700223 (unsigned long long)t->freepages_delay_total,
224 average_ms(t->freepages_delay_total, t->freepages_count));
Shailabh Nagara3baf642006-07-14 00:24:42 -0700225}
226
Ladinu Chandrasingheb7ed6982009-09-22 16:43:42 -0700227static void task_context_switch_counts(struct taskstats *t)
Maxim Uvarovb663a792007-07-15 23:40:48 -0700228{
229 printf("\n\nTask %15s%15s\n"
Randy Dunlap10e6f322008-02-08 04:21:56 -0800230 " %15llu%15llu\n",
Maxim Uvarovb663a792007-07-15 23:40:48 -0700231 "voluntary", "nonvoluntary",
Randy Dunlap66659312008-08-12 15:09:10 -0700232 (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
Maxim Uvarovb663a792007-07-15 23:40:48 -0700233}
234
Ladinu Chandrasingheb7ed6982009-09-22 16:43:42 -0700235static void print_cgroupstats(struct cgroupstats *c)
Balbir Singh546040d2007-11-14 16:59:14 -0800236{
237 printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
Randy Dunlap66659312008-08-12 15:09:10 -0700238 "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);
Balbir Singh546040d2007-11-14 16:59:14 -0800243}
244
245
Ladinu Chandrasingheb7ed6982009-09-22 16:43:42 -0700246static void print_ioacct(struct taskstats *t)
Andrew Mortoncf709842006-12-10 02:19:56 -0800247{
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
Shailabh Nagara3baf642006-07-14 00:24:42 -0700255int main(int argc, char *argv[])
256{
Jaswinder Singh Rajputb8d9a862009-06-16 15:33:46 -0700257 int c, rc, rep_len, aggr_len, len2;
258 int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700259 __u16 id;
260 __u32 mypid;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700261
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700262 struct nlattr *na;
263 int nl_sd = -1;
264 int len = 0;
265 pid_t tid = 0;
266 pid_t rtid = 0;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700267
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700268 int fd = 0;
269 int count = 0;
270 int write_file = 0;
271 int maskset = 0;
Scott Wiersdorf7f76c402007-05-08 00:30:25 -0700272 char *logfile = NULL;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700273 int loop = 0;
Balbir Singh546040d2007-11-14 16:59:14 -0800274 int containerset = 0;
Kees Cook8da01af2013-07-03 15:09:08 -0700275 char *containerpath = NULL;
Balbir Singh546040d2007-11-14 16:59:14 -0800276 int cfd = 0;
Mel Gormandb9e5672010-10-27 15:34:42 -0700277 int forking = 0;
278 sigset_t sigset;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700279
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700280 struct msgtemplate msg;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700281
Mel Gormandb9e5672010-10-27 15:34:42 -0700282 while (!forking) {
283 c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700284 if (c < 0)
285 break;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700286
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700287 switch (c) {
288 case 'd':
289 printf("print delayacct stats ON\n");
290 print_delays = 1;
291 break;
Andrew Mortoncf709842006-12-10 02:19:56 -0800292 case 'i':
293 printf("printing IO accounting\n");
294 print_io_accounting = 1;
295 break;
Maxim Uvarovb663a792007-07-15 23:40:48 -0700296 case 'q':
297 printf("printing task/process context switch rates\n");
298 print_task_context_switch_counts = 1;
299 break;
Balbir Singh546040d2007-11-14 16:59:14 -0800300 case 'C':
301 containerset = 1;
Kees Cook8da01af2013-07-03 15:09:08 -0700302 containerpath = optarg;
Balbir Singh546040d2007-11-14 16:59:14 -0800303 break;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700304 case 'w':
Scott Wiersdorf7f76c402007-05-08 00:30:25 -0700305 logfile = strdup(optarg);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700306 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));
Rickard Strandqvist88e15ce2014-06-23 13:22:04 -0700317 cpumask[sizeof(cpumask) - 1] = '\0';
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700318 maskset = 1;
319 printf("cpumask %s maskset %d\n", cpumask, maskset);
320 break;
321 case 't':
322 tid = atoi(optarg);
323 if (!tid)
324 err(1, "Invalid tgid\n");
325 cmd_type = TASKSTATS_CMD_ATTR_TGID;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700326 break;
327 case 'p':
328 tid = atoi(optarg);
329 if (!tid)
330 err(1, "Invalid pid\n");
331 cmd_type = TASKSTATS_CMD_ATTR_PID;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700332 break;
Mel Gormandb9e5672010-10-27 15:34:42 -0700333 case 'c':
334
335 /* Block SIGCHLD for sigwait() later */
336 if (sigemptyset(&sigset) == -1)
337 err(1, "Failed to empty sigset");
338 if (sigaddset(&sigset, SIGCHLD))
339 err(1, "Failed to set sigchld in sigset");
340 sigprocmask(SIG_BLOCK, &sigset, NULL);
341
342 /* fork/exec a child */
343 tid = fork();
344 if (tid < 0)
345 err(1, "Fork failed\n");
346 if (tid == 0)
347 if (execvp(argv[optind - 1],
348 &argv[optind - 1]) < 0)
349 exit(-1);
350
351 /* Set the command type and avoid further processing */
352 cmd_type = TASKSTATS_CMD_ATTR_PID;
353 forking = 1;
354 break;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700355 case 'v':
356 printf("debug on\n");
357 dbg = 1;
358 break;
359 case 'l':
360 printf("listen forever\n");
361 loop = 1;
362 break;
363 default:
Randy Dunlapf16825b2007-05-08 00:30:13 -0700364 usage();
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700365 exit(-1);
Shailabh Nagara3baf642006-07-14 00:24:42 -0700366 }
Shailabh Nagara3baf642006-07-14 00:24:42 -0700367 }
368
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700369 if (write_file) {
370 fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
371 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
372 if (fd == -1) {
373 perror("Cannot open output file\n");
374 exit(1);
375 }
Shailabh Nagara3baf642006-07-14 00:24:42 -0700376 }
377
Markus Elfring563c17c2015-12-24 11:05:32 +0100378 nl_sd = create_nl_socket(NETLINK_GENERIC);
379 if (nl_sd < 0)
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700380 err(1, "error creating Netlink socket\n");
381
382
383 mypid = getpid();
384 id = get_family_id(nl_sd);
385 if (!id) {
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800386 fprintf(stderr, "Error getting family id, errno %d\n", errno);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700387 goto err;
388 }
389 PRINTF("family id %d\n", id);
390
391 if (maskset) {
392 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
393 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
Balbir Singh7d1bdca2006-09-30 23:28:54 -0700394 &cpumask, strlen(cpumask) + 1);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700395 PRINTF("Sent register cpumask, retval %d\n", rc);
396 if (rc < 0) {
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800397 fprintf(stderr, "error sending register cpumask\n");
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700398 goto err;
399 }
Shailabh Nagara3baf642006-07-14 00:24:42 -0700400 }
401
Balbir Singh546040d2007-11-14 16:59:14 -0800402 if (tid && containerset) {
403 fprintf(stderr, "Select either -t or -C, not both\n");
404 goto err;
405 }
406
Mel Gormandb9e5672010-10-27 15:34:42 -0700407 /*
408 * If we forked a child, wait for it to exit. Cannot use waitpid()
409 * as all the delicious data would be reaped as part of the wait
410 */
411 if (tid && forking) {
412 int sig_received;
413 sigwait(&sigset, &sig_received);
414 }
415
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700416 if (tid) {
417 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
418 cmd_type, &tid, sizeof(__u32));
419 PRINTF("Sent pid/tgid, retval %d\n", rc);
420 if (rc < 0) {
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800421 fprintf(stderr, "error sending tid/tgid cmd\n");
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700422 goto done;
423 }
424 }
Shailabh Nagara3baf642006-07-14 00:24:42 -0700425
Balbir Singh546040d2007-11-14 16:59:14 -0800426 if (containerset) {
427 cfd = open(containerpath, O_RDONLY);
428 if (cfd < 0) {
429 perror("error opening container file");
430 goto err;
431 }
432 rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
433 CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
434 if (rc < 0) {
435 perror("error sending cgroupstats command");
436 goto err;
437 }
438 }
Marcus Meissner65a67bd2009-01-15 13:51:00 -0800439 if (!maskset && !tid && !containerset) {
440 usage();
441 goto err;
442 }
Balbir Singh546040d2007-11-14 16:59:14 -0800443
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700444 do {
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700445 rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
446 PRINTF("received %d bytes\n", rep_len);
447
448 if (rep_len < 0) {
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800449 fprintf(stderr, "nonfatal reply error: errno %d\n",
450 errno);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700451 continue;
452 }
453 if (msg.n.nlmsg_type == NLMSG_ERROR ||
454 !NLMSG_OK((&msg.n), rep_len)) {
Balbir Singh7d1bdca2006-09-30 23:28:54 -0700455 struct nlmsgerr *err = NLMSG_DATA(&msg);
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800456 fprintf(stderr, "fatal reply error, errno %d\n",
457 err->error);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700458 goto done;
459 }
460
Randy Dunlap10e6f322008-02-08 04:21:56 -0800461 PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700462 sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
463
464
465 rep_len = GENLMSG_PAYLOAD(&msg.n);
466
467 na = (struct nlattr *) GENLMSG_DATA(&msg);
468 len = 0;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700469 while (len < rep_len) {
470 len += NLA_ALIGN(na->nla_len);
471 switch (na->nla_type) {
472 case TASKSTATS_TYPE_AGGR_TGID:
473 /* Fall through */
474 case TASKSTATS_TYPE_AGGR_PID:
475 aggr_len = NLA_PAYLOAD(na->nla_len);
476 len2 = 0;
477 /* For nested attributes, na follows */
478 na = (struct nlattr *) NLA_DATA(na);
479 done = 0;
480 while (len2 < aggr_len) {
481 switch (na->nla_type) {
482 case TASKSTATS_TYPE_PID:
483 rtid = *(int *) NLA_DATA(na);
484 if (print_delays)
485 printf("PID\t%d\n", rtid);
486 break;
487 case TASKSTATS_TYPE_TGID:
488 rtid = *(int *) NLA_DATA(na);
489 if (print_delays)
490 printf("TGID\t%d\n", rtid);
491 break;
492 case TASKSTATS_TYPE_STATS:
493 count++;
494 if (print_delays)
495 print_delayacct((struct taskstats *) NLA_DATA(na));
Andrew Mortoncf709842006-12-10 02:19:56 -0800496 if (print_io_accounting)
497 print_ioacct((struct taskstats *) NLA_DATA(na));
Maxim Uvarovb663a792007-07-15 23:40:48 -0700498 if (print_task_context_switch_counts)
499 task_context_switch_counts((struct taskstats *) NLA_DATA(na));
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700500 if (fd) {
501 if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
502 err(1,"write error\n");
503 }
504 }
505 if (!loop)
506 goto done;
507 break;
Nicolas Dichtel570d8e92016-04-27 17:53:08 +0200508 case TASKSTATS_TYPE_NULL:
509 break;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700510 default:
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800511 fprintf(stderr, "Unknown nested"
512 " nla_type %d\n",
513 na->nla_type);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700514 break;
515 }
516 len2 += NLA_ALIGN(na->nla_len);
Nicolas Dichtel570d8e92016-04-27 17:53:08 +0200517 na = (struct nlattr *)((char *)na +
518 NLA_ALIGN(na->nla_len));
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700519 }
520 break;
521
Balbir Singh546040d2007-11-14 16:59:14 -0800522 case CGROUPSTATS_TYPE_CGROUP_STATS:
523 print_cgroupstats(NLA_DATA(na));
524 break;
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700525 default:
Andrew Mortond2f7bf12006-12-10 02:19:55 -0800526 fprintf(stderr, "Unknown nla_type %d\n",
527 na->nla_type);
Jeff Mahoney4be2c952010-12-21 17:24:30 -0800528 case TASKSTATS_TYPE_NULL:
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700529 break;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700530 }
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700531 na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
Shailabh Nagara3baf642006-07-14 00:24:42 -0700532 }
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700533 } while (loop);
534done:
535 if (maskset) {
536 rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
537 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
Balbir Singh7d1bdca2006-09-30 23:28:54 -0700538 &cpumask, strlen(cpumask) + 1);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700539 printf("Sent deregister mask, retval %d\n", rc);
540 if (rc < 0)
541 err(rc, "error sending deregister cpumask\n");
Shailabh Nagara3baf642006-07-14 00:24:42 -0700542 }
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700543err:
544 close(nl_sd);
545 if (fd)
546 close(fd);
Balbir Singh546040d2007-11-14 16:59:14 -0800547 if (cfd)
548 close(cfd);
Shailabh Nagar9e06d3f2006-07-14 00:24:45 -0700549 return 0;
Shailabh Nagara3baf642006-07-14 00:24:42 -0700550}