1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
2d522b2cdSShuah Khan /* getdelays.c
3d522b2cdSShuah Khan *
4d522b2cdSShuah Khan * Utility to get per-pid and per-tgid delay accounting statistics
5d522b2cdSShuah Khan * Also illustrates usage of the taskstats interface
6d522b2cdSShuah Khan *
7d522b2cdSShuah Khan * Copyright (C) Shailabh Nagar, IBM Corp. 2005
8d522b2cdSShuah Khan * Copyright (C) Balbir Singh, IBM Corp. 2006
9d522b2cdSShuah Khan * Copyright (c) Jay Lan, SGI. 2006
10d522b2cdSShuah Khan *
11d522b2cdSShuah Khan * Compile with
12d522b2cdSShuah Khan * gcc -I/usr/src/linux/include getdelays.c -o getdelays
13d522b2cdSShuah Khan */
14d522b2cdSShuah Khan
15d522b2cdSShuah Khan #include <stdio.h>
16d522b2cdSShuah Khan #include <stdlib.h>
17d522b2cdSShuah Khan #include <errno.h>
18d522b2cdSShuah Khan #include <unistd.h>
19d522b2cdSShuah Khan #include <poll.h>
20d522b2cdSShuah Khan #include <string.h>
21d522b2cdSShuah Khan #include <fcntl.h>
22d522b2cdSShuah Khan #include <sys/types.h>
23d522b2cdSShuah Khan #include <sys/stat.h>
24d522b2cdSShuah Khan #include <sys/socket.h>
25d522b2cdSShuah Khan #include <sys/wait.h>
26d522b2cdSShuah Khan #include <signal.h>
27d522b2cdSShuah Khan
28d522b2cdSShuah Khan #include <linux/genetlink.h>
29d522b2cdSShuah Khan #include <linux/taskstats.h>
30d522b2cdSShuah Khan #include <linux/cgroupstats.h>
31d522b2cdSShuah Khan
32d522b2cdSShuah Khan /*
33d522b2cdSShuah Khan * Generic macros for dealing with netlink sockets. Might be duplicated
34d522b2cdSShuah Khan * elsewhere. It is recommended that commercial grade applications use
35d522b2cdSShuah Khan * libnl or libnetlink and use the interfaces provided by the library
36d522b2cdSShuah Khan */
37d522b2cdSShuah Khan #define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
38d522b2cdSShuah Khan #define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
39d522b2cdSShuah Khan #define NLA_DATA(na) ((void *)((char*)(na) + NLA_HDRLEN))
40d522b2cdSShuah Khan #define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
41d522b2cdSShuah Khan
42d522b2cdSShuah Khan #define err(code, fmt, arg...) \
43d522b2cdSShuah Khan do { \
44d522b2cdSShuah Khan fprintf(stderr, fmt, ##arg); \
45d522b2cdSShuah Khan exit(code); \
46d522b2cdSShuah Khan } while (0)
47d522b2cdSShuah Khan
48d522b2cdSShuah Khan int rcvbufsz;
49d522b2cdSShuah Khan char name[100];
50d522b2cdSShuah Khan int dbg;
51d522b2cdSShuah Khan int print_delays;
52d522b2cdSShuah Khan int print_io_accounting;
53d522b2cdSShuah Khan int print_task_context_switch_counts;
54d522b2cdSShuah Khan
55d522b2cdSShuah Khan #define PRINTF(fmt, arg...) { \
56d522b2cdSShuah Khan if (dbg) { \
57d522b2cdSShuah Khan printf(fmt, ##arg); \
58d522b2cdSShuah Khan } \
59d522b2cdSShuah Khan }
60d522b2cdSShuah Khan
61d522b2cdSShuah Khan /* Maximum size of response requested or message sent */
62d522b2cdSShuah Khan #define MAX_MSG_SIZE 1024
63d522b2cdSShuah Khan /* Maximum number of cpus expected to be specified in a cpumask */
64d522b2cdSShuah Khan #define MAX_CPUS 32
65d522b2cdSShuah Khan
66d522b2cdSShuah Khan struct msgtemplate {
67d522b2cdSShuah Khan struct nlmsghdr n;
68d522b2cdSShuah Khan struct genlmsghdr g;
69d522b2cdSShuah Khan char buf[MAX_MSG_SIZE];
70d522b2cdSShuah Khan };
71d522b2cdSShuah Khan
72d522b2cdSShuah Khan char cpumask[100+6*MAX_CPUS];
73d522b2cdSShuah Khan
usage(void)74d522b2cdSShuah Khan static void usage(void)
75d522b2cdSShuah Khan {
76d522b2cdSShuah Khan fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
77d522b2cdSShuah Khan "[-m cpumask] [-t tgid] [-p pid]\n");
78d522b2cdSShuah Khan fprintf(stderr, " -d: print delayacct stats\n");
79d522b2cdSShuah Khan fprintf(stderr, " -i: print IO accounting (works only with -p)\n");
80d522b2cdSShuah Khan fprintf(stderr, " -l: listen forever\n");
81d522b2cdSShuah Khan fprintf(stderr, " -v: debug on\n");
82d522b2cdSShuah Khan fprintf(stderr, " -C: container path\n");
83d522b2cdSShuah Khan }
84d522b2cdSShuah Khan
85d522b2cdSShuah Khan /*
86d522b2cdSShuah Khan * Create a raw netlink socket and bind
87d522b2cdSShuah Khan */
create_nl_socket(int protocol)88d522b2cdSShuah Khan static int create_nl_socket(int protocol)
89d522b2cdSShuah Khan {
90d522b2cdSShuah Khan int fd;
91d522b2cdSShuah Khan struct sockaddr_nl local;
92d522b2cdSShuah Khan
93d522b2cdSShuah Khan fd = socket(AF_NETLINK, SOCK_RAW, protocol);
94d522b2cdSShuah Khan if (fd < 0)
95d522b2cdSShuah Khan return -1;
96d522b2cdSShuah Khan
97d522b2cdSShuah Khan if (rcvbufsz)
98d522b2cdSShuah Khan if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
99d522b2cdSShuah Khan &rcvbufsz, sizeof(rcvbufsz)) < 0) {
100d522b2cdSShuah Khan fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
101d522b2cdSShuah Khan rcvbufsz);
102d522b2cdSShuah Khan goto error;
103d522b2cdSShuah Khan }
104d522b2cdSShuah Khan
105d522b2cdSShuah Khan memset(&local, 0, sizeof(local));
106d522b2cdSShuah Khan local.nl_family = AF_NETLINK;
107d522b2cdSShuah Khan
108d522b2cdSShuah Khan if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
109d522b2cdSShuah Khan goto error;
110d522b2cdSShuah Khan
111d522b2cdSShuah Khan return fd;
112d522b2cdSShuah Khan error:
113d522b2cdSShuah Khan close(fd);
114d522b2cdSShuah Khan return -1;
115d522b2cdSShuah Khan }
116d522b2cdSShuah Khan
117d522b2cdSShuah Khan
send_cmd(int sd,__u16 nlmsg_type,__u32 nlmsg_pid,__u8 genl_cmd,__u16 nla_type,void * nla_data,int nla_len)118d522b2cdSShuah Khan static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
119d522b2cdSShuah Khan __u8 genl_cmd, __u16 nla_type,
120d522b2cdSShuah Khan void *nla_data, int nla_len)
121d522b2cdSShuah Khan {
122d522b2cdSShuah Khan struct nlattr *na;
123d522b2cdSShuah Khan struct sockaddr_nl nladdr;
124d522b2cdSShuah Khan int r, buflen;
125d522b2cdSShuah Khan char *buf;
126d522b2cdSShuah Khan
127d522b2cdSShuah Khan struct msgtemplate msg;
128d522b2cdSShuah Khan
129d522b2cdSShuah Khan msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
130d522b2cdSShuah Khan msg.n.nlmsg_type = nlmsg_type;
131d522b2cdSShuah Khan msg.n.nlmsg_flags = NLM_F_REQUEST;
132d522b2cdSShuah Khan msg.n.nlmsg_seq = 0;
133d522b2cdSShuah Khan msg.n.nlmsg_pid = nlmsg_pid;
134d522b2cdSShuah Khan msg.g.cmd = genl_cmd;
135d522b2cdSShuah Khan msg.g.version = 0x1;
136d522b2cdSShuah Khan na = (struct nlattr *) GENLMSG_DATA(&msg);
137d522b2cdSShuah Khan na->nla_type = nla_type;
1384054ab64SDavid Ahern na->nla_len = nla_len + NLA_HDRLEN;
139d522b2cdSShuah Khan memcpy(NLA_DATA(na), nla_data, nla_len);
140d522b2cdSShuah Khan msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
141d522b2cdSShuah Khan
142d522b2cdSShuah Khan buf = (char *) &msg;
143d522b2cdSShuah Khan buflen = msg.n.nlmsg_len ;
144d522b2cdSShuah Khan memset(&nladdr, 0, sizeof(nladdr));
145d522b2cdSShuah Khan nladdr.nl_family = AF_NETLINK;
146d522b2cdSShuah Khan while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
147d522b2cdSShuah Khan sizeof(nladdr))) < buflen) {
148d522b2cdSShuah Khan if (r > 0) {
149d522b2cdSShuah Khan buf += r;
150d522b2cdSShuah Khan buflen -= r;
151d522b2cdSShuah Khan } else if (errno != EAGAIN)
152d522b2cdSShuah Khan return -1;
153d522b2cdSShuah Khan }
154d522b2cdSShuah Khan return 0;
155d522b2cdSShuah Khan }
156d522b2cdSShuah Khan
157d522b2cdSShuah Khan
158d522b2cdSShuah Khan /*
159d522b2cdSShuah Khan * Probe the controller in genetlink to find the family id
160d522b2cdSShuah Khan * for the TASKSTATS family
161d522b2cdSShuah Khan */
get_family_id(int sd)162d522b2cdSShuah Khan static int get_family_id(int sd)
163d522b2cdSShuah Khan {
164d522b2cdSShuah Khan struct {
165d522b2cdSShuah Khan struct nlmsghdr n;
166d522b2cdSShuah Khan struct genlmsghdr g;
167d522b2cdSShuah Khan char buf[256];
168d522b2cdSShuah Khan } ans;
169d522b2cdSShuah Khan
170d522b2cdSShuah Khan int id = 0, rc;
171d522b2cdSShuah Khan struct nlattr *na;
172d522b2cdSShuah Khan int rep_len;
173d522b2cdSShuah Khan
174d522b2cdSShuah Khan strcpy(name, TASKSTATS_GENL_NAME);
175d522b2cdSShuah Khan rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
176d522b2cdSShuah Khan CTRL_ATTR_FAMILY_NAME, (void *)name,
177d522b2cdSShuah Khan strlen(TASKSTATS_GENL_NAME)+1);
178d522b2cdSShuah Khan if (rc < 0)
179d522b2cdSShuah Khan return 0; /* sendto() failure? */
180d522b2cdSShuah Khan
181d522b2cdSShuah Khan rep_len = recv(sd, &ans, sizeof(ans), 0);
182d522b2cdSShuah Khan if (ans.n.nlmsg_type == NLMSG_ERROR ||
183d522b2cdSShuah Khan (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
184d522b2cdSShuah Khan return 0;
185d522b2cdSShuah Khan
186d522b2cdSShuah Khan na = (struct nlattr *) GENLMSG_DATA(&ans);
187d522b2cdSShuah Khan na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
188d522b2cdSShuah Khan if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
189d522b2cdSShuah Khan id = *(__u16 *) NLA_DATA(na);
190d522b2cdSShuah Khan }
191d522b2cdSShuah Khan return id;
192d522b2cdSShuah Khan }
193d522b2cdSShuah Khan
194d522b2cdSShuah Khan #define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
195d522b2cdSShuah Khan
print_delayacct(struct taskstats * t)196d522b2cdSShuah Khan static void print_delayacct(struct taskstats *t)
197d522b2cdSShuah Khan {
198d522b2cdSShuah Khan printf("\n\nCPU %15s%15s%15s%15s%15s\n"
199d522b2cdSShuah Khan " %15llu%15llu%15llu%15llu%15.3fms\n"
200d522b2cdSShuah Khan "IO %15s%15s%15s\n"
201eca7de7cSWang Yong " %15llu%15llu%15.3fms\n"
202d522b2cdSShuah Khan "SWAP %15s%15s%15s\n"
203eca7de7cSWang Yong " %15llu%15llu%15.3fms\n"
204d522b2cdSShuah Khan "RECLAIM %12s%15s%15s\n"
205eca7de7cSWang Yong " %15llu%15llu%15.3fms\n"
206b1d29ba8SJohannes Weiner "THRASHING%12s%15s%15s\n"
207eca7de7cSWang Yong " %15llu%15llu%15.3fms\n"
2085bf18281Swangyong "COMPACT %12s%15s%15s\n"
209eca7de7cSWang Yong " %15llu%15llu%15.3fms\n"
210662ce1dcSYang Yang "WPCOPY %12s%15s%15s\n"
211*a3b2aeacSYang Yang " %15llu%15llu%15.3fms\n"
212*a3b2aeacSYang Yang "IRQ %15s%15s%15s\n"
213eca7de7cSWang Yong " %15llu%15llu%15.3fms\n",
214d522b2cdSShuah Khan "count", "real total", "virtual total",
215d522b2cdSShuah Khan "delay total", "delay average",
216d522b2cdSShuah Khan (unsigned long long)t->cpu_count,
217d522b2cdSShuah Khan (unsigned long long)t->cpu_run_real_total,
218d522b2cdSShuah Khan (unsigned long long)t->cpu_run_virtual_total,
219d522b2cdSShuah Khan (unsigned long long)t->cpu_delay_total,
220d522b2cdSShuah Khan average_ms((double)t->cpu_delay_total, t->cpu_count),
221d522b2cdSShuah Khan "count", "delay total", "delay average",
222d522b2cdSShuah Khan (unsigned long long)t->blkio_count,
223d522b2cdSShuah Khan (unsigned long long)t->blkio_delay_total,
224eca7de7cSWang Yong average_ms((double)t->blkio_delay_total, t->blkio_count),
225d522b2cdSShuah Khan "count", "delay total", "delay average",
226d522b2cdSShuah Khan (unsigned long long)t->swapin_count,
227d522b2cdSShuah Khan (unsigned long long)t->swapin_delay_total,
228eca7de7cSWang Yong average_ms((double)t->swapin_delay_total, t->swapin_count),
229d522b2cdSShuah Khan "count", "delay total", "delay average",
230d522b2cdSShuah Khan (unsigned long long)t->freepages_count,
231d522b2cdSShuah Khan (unsigned long long)t->freepages_delay_total,
232eca7de7cSWang Yong average_ms((double)t->freepages_delay_total, t->freepages_count),
233b1d29ba8SJohannes Weiner "count", "delay total", "delay average",
234b1d29ba8SJohannes Weiner (unsigned long long)t->thrashing_count,
235b1d29ba8SJohannes Weiner (unsigned long long)t->thrashing_delay_total,
236eca7de7cSWang Yong average_ms((double)t->thrashing_delay_total, t->thrashing_count),
2375bf18281Swangyong "count", "delay total", "delay average",
2385bf18281Swangyong (unsigned long long)t->compact_count,
2395bf18281Swangyong (unsigned long long)t->compact_delay_total,
240eca7de7cSWang Yong average_ms((double)t->compact_delay_total, t->compact_count),
241662ce1dcSYang Yang "count", "delay total", "delay average",
242662ce1dcSYang Yang (unsigned long long)t->wpcopy_count,
243662ce1dcSYang Yang (unsigned long long)t->wpcopy_delay_total,
244*a3b2aeacSYang Yang average_ms((double)t->wpcopy_delay_total, t->wpcopy_count),
245*a3b2aeacSYang Yang "count", "delay total", "delay average",
246*a3b2aeacSYang Yang (unsigned long long)t->irq_count,
247*a3b2aeacSYang Yang (unsigned long long)t->irq_delay_total,
248*a3b2aeacSYang Yang average_ms((double)t->irq_delay_total, t->irq_count));
249d522b2cdSShuah Khan }
250d522b2cdSShuah Khan
task_context_switch_counts(struct taskstats * t)251d522b2cdSShuah Khan static void task_context_switch_counts(struct taskstats *t)
252d522b2cdSShuah Khan {
253d522b2cdSShuah Khan printf("\n\nTask %15s%15s\n"
254d522b2cdSShuah Khan " %15llu%15llu\n",
255d522b2cdSShuah Khan "voluntary", "nonvoluntary",
256d522b2cdSShuah Khan (unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
257d522b2cdSShuah Khan }
258d522b2cdSShuah Khan
print_cgroupstats(struct cgroupstats * c)259d522b2cdSShuah Khan static void print_cgroupstats(struct cgroupstats *c)
260d522b2cdSShuah Khan {
261d522b2cdSShuah Khan printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
262d522b2cdSShuah Khan "uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
263d522b2cdSShuah Khan (unsigned long long)c->nr_io_wait,
264d522b2cdSShuah Khan (unsigned long long)c->nr_running,
265d522b2cdSShuah Khan (unsigned long long)c->nr_stopped,
266d522b2cdSShuah Khan (unsigned long long)c->nr_uninterruptible);
267d522b2cdSShuah Khan }
268d522b2cdSShuah Khan
269d522b2cdSShuah Khan
print_ioacct(struct taskstats * t)270d522b2cdSShuah Khan static void print_ioacct(struct taskstats *t)
271d522b2cdSShuah Khan {
272d522b2cdSShuah Khan printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
273d522b2cdSShuah Khan t->ac_comm,
274d522b2cdSShuah Khan (unsigned long long)t->read_bytes,
275d522b2cdSShuah Khan (unsigned long long)t->write_bytes,
276d522b2cdSShuah Khan (unsigned long long)t->cancelled_write_bytes);
277d522b2cdSShuah Khan }
278d522b2cdSShuah Khan
main(int argc,char * argv[])279d522b2cdSShuah Khan int main(int argc, char *argv[])
280d522b2cdSShuah Khan {
281d522b2cdSShuah Khan int c, rc, rep_len, aggr_len, len2;
282d522b2cdSShuah Khan int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
283d522b2cdSShuah Khan __u16 id;
284d522b2cdSShuah Khan __u32 mypid;
285d522b2cdSShuah Khan
286d522b2cdSShuah Khan struct nlattr *na;
287d522b2cdSShuah Khan int nl_sd = -1;
288d522b2cdSShuah Khan int len = 0;
289d522b2cdSShuah Khan pid_t tid = 0;
290d522b2cdSShuah Khan pid_t rtid = 0;
291d522b2cdSShuah Khan
292d522b2cdSShuah Khan int fd = 0;
293d522b2cdSShuah Khan int write_file = 0;
294d522b2cdSShuah Khan int maskset = 0;
295d522b2cdSShuah Khan char *logfile = NULL;
296d522b2cdSShuah Khan int loop = 0;
297d522b2cdSShuah Khan int containerset = 0;
298d522b2cdSShuah Khan char *containerpath = NULL;
299d522b2cdSShuah Khan int cfd = 0;
300d522b2cdSShuah Khan int forking = 0;
301d522b2cdSShuah Khan sigset_t sigset;
302d522b2cdSShuah Khan
303d522b2cdSShuah Khan struct msgtemplate msg;
304d522b2cdSShuah Khan
305d522b2cdSShuah Khan while (!forking) {
306d522b2cdSShuah Khan c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
307d522b2cdSShuah Khan if (c < 0)
308d522b2cdSShuah Khan break;
309d522b2cdSShuah Khan
310d522b2cdSShuah Khan switch (c) {
311d522b2cdSShuah Khan case 'd':
312d522b2cdSShuah Khan printf("print delayacct stats ON\n");
313d522b2cdSShuah Khan print_delays = 1;
314d522b2cdSShuah Khan break;
315d522b2cdSShuah Khan case 'i':
316d522b2cdSShuah Khan printf("printing IO accounting\n");
317d522b2cdSShuah Khan print_io_accounting = 1;
318d522b2cdSShuah Khan break;
319d522b2cdSShuah Khan case 'q':
320d522b2cdSShuah Khan printf("printing task/process context switch rates\n");
321d522b2cdSShuah Khan print_task_context_switch_counts = 1;
322d522b2cdSShuah Khan break;
323d522b2cdSShuah Khan case 'C':
324d522b2cdSShuah Khan containerset = 1;
325d522b2cdSShuah Khan containerpath = optarg;
326d522b2cdSShuah Khan break;
327d522b2cdSShuah Khan case 'w':
328d522b2cdSShuah Khan logfile = strdup(optarg);
329d522b2cdSShuah Khan printf("write to file %s\n", logfile);
330d522b2cdSShuah Khan write_file = 1;
331d522b2cdSShuah Khan break;
332d522b2cdSShuah Khan case 'r':
333d522b2cdSShuah Khan rcvbufsz = atoi(optarg);
334d522b2cdSShuah Khan printf("receive buf size %d\n", rcvbufsz);
335d522b2cdSShuah Khan if (rcvbufsz < 0)
336d522b2cdSShuah Khan err(1, "Invalid rcv buf size\n");
337d522b2cdSShuah Khan break;
338d522b2cdSShuah Khan case 'm':
339d522b2cdSShuah Khan strncpy(cpumask, optarg, sizeof(cpumask));
340d522b2cdSShuah Khan cpumask[sizeof(cpumask) - 1] = '\0';
341d522b2cdSShuah Khan maskset = 1;
342d522b2cdSShuah Khan printf("cpumask %s maskset %d\n", cpumask, maskset);
343d522b2cdSShuah Khan break;
344d522b2cdSShuah Khan case 't':
345d522b2cdSShuah Khan tid = atoi(optarg);
346d522b2cdSShuah Khan if (!tid)
347d522b2cdSShuah Khan err(1, "Invalid tgid\n");
348d522b2cdSShuah Khan cmd_type = TASKSTATS_CMD_ATTR_TGID;
349d522b2cdSShuah Khan break;
350d522b2cdSShuah Khan case 'p':
351d522b2cdSShuah Khan tid = atoi(optarg);
352d522b2cdSShuah Khan if (!tid)
353d522b2cdSShuah Khan err(1, "Invalid pid\n");
354d522b2cdSShuah Khan cmd_type = TASKSTATS_CMD_ATTR_PID;
355d522b2cdSShuah Khan break;
356d522b2cdSShuah Khan case 'c':
357d522b2cdSShuah Khan
358d522b2cdSShuah Khan /* Block SIGCHLD for sigwait() later */
359d522b2cdSShuah Khan if (sigemptyset(&sigset) == -1)
360d522b2cdSShuah Khan err(1, "Failed to empty sigset");
361d522b2cdSShuah Khan if (sigaddset(&sigset, SIGCHLD))
362d522b2cdSShuah Khan err(1, "Failed to set sigchld in sigset");
363d522b2cdSShuah Khan sigprocmask(SIG_BLOCK, &sigset, NULL);
364d522b2cdSShuah Khan
365d522b2cdSShuah Khan /* fork/exec a child */
366d522b2cdSShuah Khan tid = fork();
367d522b2cdSShuah Khan if (tid < 0)
368d522b2cdSShuah Khan err(1, "Fork failed\n");
369d522b2cdSShuah Khan if (tid == 0)
370d522b2cdSShuah Khan if (execvp(argv[optind - 1],
371d522b2cdSShuah Khan &argv[optind - 1]) < 0)
372d522b2cdSShuah Khan exit(-1);
373d522b2cdSShuah Khan
374d522b2cdSShuah Khan /* Set the command type and avoid further processing */
375d522b2cdSShuah Khan cmd_type = TASKSTATS_CMD_ATTR_PID;
376d522b2cdSShuah Khan forking = 1;
377d522b2cdSShuah Khan break;
378d522b2cdSShuah Khan case 'v':
379d522b2cdSShuah Khan printf("debug on\n");
380d522b2cdSShuah Khan dbg = 1;
381d522b2cdSShuah Khan break;
382d522b2cdSShuah Khan case 'l':
383d522b2cdSShuah Khan printf("listen forever\n");
384d522b2cdSShuah Khan loop = 1;
385d522b2cdSShuah Khan break;
386d522b2cdSShuah Khan default:
387d522b2cdSShuah Khan usage();
388d522b2cdSShuah Khan exit(-1);
389d522b2cdSShuah Khan }
390d522b2cdSShuah Khan }
391d522b2cdSShuah Khan
392d522b2cdSShuah Khan if (write_file) {
393d522b2cdSShuah Khan fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
394d522b2cdSShuah Khan S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
395d522b2cdSShuah Khan if (fd == -1) {
396d522b2cdSShuah Khan perror("Cannot open output file\n");
397d522b2cdSShuah Khan exit(1);
398d522b2cdSShuah Khan }
399d522b2cdSShuah Khan }
400d522b2cdSShuah Khan
401d522b2cdSShuah Khan nl_sd = create_nl_socket(NETLINK_GENERIC);
402d522b2cdSShuah Khan if (nl_sd < 0)
403d522b2cdSShuah Khan err(1, "error creating Netlink socket\n");
404d522b2cdSShuah Khan
405d522b2cdSShuah Khan
406d522b2cdSShuah Khan mypid = getpid();
407d522b2cdSShuah Khan id = get_family_id(nl_sd);
408d522b2cdSShuah Khan if (!id) {
409d522b2cdSShuah Khan fprintf(stderr, "Error getting family id, errno %d\n", errno);
410d522b2cdSShuah Khan goto err;
411d522b2cdSShuah Khan }
412d522b2cdSShuah Khan PRINTF("family id %d\n", id);
413d522b2cdSShuah Khan
414d522b2cdSShuah Khan if (maskset) {
415d522b2cdSShuah Khan rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
416d522b2cdSShuah Khan TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
417d522b2cdSShuah Khan &cpumask, strlen(cpumask) + 1);
418d522b2cdSShuah Khan PRINTF("Sent register cpumask, retval %d\n", rc);
419d522b2cdSShuah Khan if (rc < 0) {
420d522b2cdSShuah Khan fprintf(stderr, "error sending register cpumask\n");
421d522b2cdSShuah Khan goto err;
422d522b2cdSShuah Khan }
423d522b2cdSShuah Khan }
424d522b2cdSShuah Khan
425d522b2cdSShuah Khan if (tid && containerset) {
426d522b2cdSShuah Khan fprintf(stderr, "Select either -t or -C, not both\n");
427d522b2cdSShuah Khan goto err;
428d522b2cdSShuah Khan }
429d522b2cdSShuah Khan
430d522b2cdSShuah Khan /*
431d522b2cdSShuah Khan * If we forked a child, wait for it to exit. Cannot use waitpid()
432d522b2cdSShuah Khan * as all the delicious data would be reaped as part of the wait
433d522b2cdSShuah Khan */
434d522b2cdSShuah Khan if (tid && forking) {
435d522b2cdSShuah Khan int sig_received;
436d522b2cdSShuah Khan sigwait(&sigset, &sig_received);
437d522b2cdSShuah Khan }
438d522b2cdSShuah Khan
439d522b2cdSShuah Khan if (tid) {
440d522b2cdSShuah Khan rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
441d522b2cdSShuah Khan cmd_type, &tid, sizeof(__u32));
442d522b2cdSShuah Khan PRINTF("Sent pid/tgid, retval %d\n", rc);
443d522b2cdSShuah Khan if (rc < 0) {
444d522b2cdSShuah Khan fprintf(stderr, "error sending tid/tgid cmd\n");
445d522b2cdSShuah Khan goto done;
446d522b2cdSShuah Khan }
447d522b2cdSShuah Khan }
448d522b2cdSShuah Khan
449d522b2cdSShuah Khan if (containerset) {
450d522b2cdSShuah Khan cfd = open(containerpath, O_RDONLY);
451d522b2cdSShuah Khan if (cfd < 0) {
452d522b2cdSShuah Khan perror("error opening container file");
453d522b2cdSShuah Khan goto err;
454d522b2cdSShuah Khan }
455d522b2cdSShuah Khan rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
456d522b2cdSShuah Khan CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
457d522b2cdSShuah Khan if (rc < 0) {
458d522b2cdSShuah Khan perror("error sending cgroupstats command");
459d522b2cdSShuah Khan goto err;
460d522b2cdSShuah Khan }
461d522b2cdSShuah Khan }
462d522b2cdSShuah Khan if (!maskset && !tid && !containerset) {
463d522b2cdSShuah Khan usage();
464d522b2cdSShuah Khan goto err;
465d522b2cdSShuah Khan }
466d522b2cdSShuah Khan
467d522b2cdSShuah Khan do {
468d522b2cdSShuah Khan rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
469d522b2cdSShuah Khan PRINTF("received %d bytes\n", rep_len);
470d522b2cdSShuah Khan
471d522b2cdSShuah Khan if (rep_len < 0) {
472d522b2cdSShuah Khan fprintf(stderr, "nonfatal reply error: errno %d\n",
473d522b2cdSShuah Khan errno);
474d522b2cdSShuah Khan continue;
475d522b2cdSShuah Khan }
476d522b2cdSShuah Khan if (msg.n.nlmsg_type == NLMSG_ERROR ||
477d522b2cdSShuah Khan !NLMSG_OK((&msg.n), rep_len)) {
478d522b2cdSShuah Khan struct nlmsgerr *err = NLMSG_DATA(&msg);
479d522b2cdSShuah Khan fprintf(stderr, "fatal reply error, errno %d\n",
480d522b2cdSShuah Khan err->error);
481d522b2cdSShuah Khan goto done;
482d522b2cdSShuah Khan }
483d522b2cdSShuah Khan
484d522b2cdSShuah Khan PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
485d522b2cdSShuah Khan sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
486d522b2cdSShuah Khan
487d522b2cdSShuah Khan
488d522b2cdSShuah Khan rep_len = GENLMSG_PAYLOAD(&msg.n);
489d522b2cdSShuah Khan
490d522b2cdSShuah Khan na = (struct nlattr *) GENLMSG_DATA(&msg);
491d522b2cdSShuah Khan len = 0;
492d522b2cdSShuah Khan while (len < rep_len) {
493d522b2cdSShuah Khan len += NLA_ALIGN(na->nla_len);
494d522b2cdSShuah Khan switch (na->nla_type) {
495d522b2cdSShuah Khan case TASKSTATS_TYPE_AGGR_TGID:
496d522b2cdSShuah Khan /* Fall through */
497d522b2cdSShuah Khan case TASKSTATS_TYPE_AGGR_PID:
498d522b2cdSShuah Khan aggr_len = NLA_PAYLOAD(na->nla_len);
499d522b2cdSShuah Khan len2 = 0;
500d522b2cdSShuah Khan /* For nested attributes, na follows */
501d522b2cdSShuah Khan na = (struct nlattr *) NLA_DATA(na);
502d522b2cdSShuah Khan while (len2 < aggr_len) {
503d522b2cdSShuah Khan switch (na->nla_type) {
504d522b2cdSShuah Khan case TASKSTATS_TYPE_PID:
505d522b2cdSShuah Khan rtid = *(int *) NLA_DATA(na);
506d522b2cdSShuah Khan if (print_delays)
507d522b2cdSShuah Khan printf("PID\t%d\n", rtid);
508d522b2cdSShuah Khan break;
509d522b2cdSShuah Khan case TASKSTATS_TYPE_TGID:
510d522b2cdSShuah Khan rtid = *(int *) NLA_DATA(na);
511d522b2cdSShuah Khan if (print_delays)
512d522b2cdSShuah Khan printf("TGID\t%d\n", rtid);
513d522b2cdSShuah Khan break;
514d522b2cdSShuah Khan case TASKSTATS_TYPE_STATS:
515d522b2cdSShuah Khan if (print_delays)
516d522b2cdSShuah Khan print_delayacct((struct taskstats *) NLA_DATA(na));
517d522b2cdSShuah Khan if (print_io_accounting)
518d522b2cdSShuah Khan print_ioacct((struct taskstats *) NLA_DATA(na));
519d522b2cdSShuah Khan if (print_task_context_switch_counts)
520d522b2cdSShuah Khan task_context_switch_counts((struct taskstats *) NLA_DATA(na));
521d522b2cdSShuah Khan if (fd) {
522d522b2cdSShuah Khan if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
523d522b2cdSShuah Khan err(1,"write error\n");
524d522b2cdSShuah Khan }
525d522b2cdSShuah Khan }
526d522b2cdSShuah Khan if (!loop)
527d522b2cdSShuah Khan goto done;
528d522b2cdSShuah Khan break;
529d522b2cdSShuah Khan case TASKSTATS_TYPE_NULL:
530d522b2cdSShuah Khan break;
531d522b2cdSShuah Khan default:
532d522b2cdSShuah Khan fprintf(stderr, "Unknown nested"
533d522b2cdSShuah Khan " nla_type %d\n",
534d522b2cdSShuah Khan na->nla_type);
535d522b2cdSShuah Khan break;
536d522b2cdSShuah Khan }
537d522b2cdSShuah Khan len2 += NLA_ALIGN(na->nla_len);
538d522b2cdSShuah Khan na = (struct nlattr *)((char *)na +
539d522b2cdSShuah Khan NLA_ALIGN(na->nla_len));
540d522b2cdSShuah Khan }
541d522b2cdSShuah Khan break;
542d522b2cdSShuah Khan
543d522b2cdSShuah Khan case CGROUPSTATS_TYPE_CGROUP_STATS:
544d522b2cdSShuah Khan print_cgroupstats(NLA_DATA(na));
545d522b2cdSShuah Khan break;
546d522b2cdSShuah Khan default:
547d522b2cdSShuah Khan fprintf(stderr, "Unknown nla_type %d\n",
548d522b2cdSShuah Khan na->nla_type);
549d522b2cdSShuah Khan case TASKSTATS_TYPE_NULL:
550d522b2cdSShuah Khan break;
551d522b2cdSShuah Khan }
552d522b2cdSShuah Khan na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
553d522b2cdSShuah Khan }
554d522b2cdSShuah Khan } while (loop);
555d522b2cdSShuah Khan done:
556d522b2cdSShuah Khan if (maskset) {
557d522b2cdSShuah Khan rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
558d522b2cdSShuah Khan TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
559d522b2cdSShuah Khan &cpumask, strlen(cpumask) + 1);
560d522b2cdSShuah Khan printf("Sent deregister mask, retval %d\n", rc);
561d522b2cdSShuah Khan if (rc < 0)
562d522b2cdSShuah Khan err(rc, "error sending deregister cpumask\n");
563d522b2cdSShuah Khan }
564d522b2cdSShuah Khan err:
565d522b2cdSShuah Khan close(nl_sd);
566d522b2cdSShuah Khan if (fd)
567d522b2cdSShuah Khan close(fd);
568d522b2cdSShuah Khan if (cfd)
569d522b2cdSShuah Khan close(cfd);
570d522b2cdSShuah Khan return 0;
571d522b2cdSShuah Khan }
572