[deliverable/linux.git] / Documentation / accounting / getdelays.c

/* getdelays.c
 *
 * Utility to get per-pid and per-tgid delay accounting statistics
 * Also illustrates usage of the taskstats interface
 *
 * Copyright (C) Shailabh Nagar, IBM Corp. 2005
 * Copyright (C) Balbir Singh, IBM Corp. 2006
 * Copyright (c) Jay Lan, SGI. 2006
 *
 * Compile with
 *	gcc -I/usr/src/linux/include getdelays.c -o getdelays
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <poll.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <signal.h>

#include <linux/genetlink.h>
#include <linux/taskstats.h>

/*
 * Generic macros for dealing with netlink sockets. Might be duplicated
 * elsewhere. It is recommended that commercial grade applications use
 * libnl or libnetlink and use the interfaces provided by the library
 */
#define GENLMSG_DATA(glh)	((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
#define GENLMSG_PAYLOAD(glh)	(NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
#define NLA_DATA(na)		((void *)((char*)(na) + NLA_HDRLEN))
#define NLA_PAYLOAD(len)	(len - NLA_HDRLEN)

#define err(code, fmt, arg...)			\
	do {					\
		fprintf(stderr, fmt, ##arg);	\
		exit(code);			\
	} while (0)

int done;
int rcvbufsz;
char name[100];
int dbg;
int print_delays;
int print_io_accounting;
int print_task_context_switch_counts;
__u64 stime, utime;

#define PRINTF(fmt, arg...) {			\
	    if (dbg) {				\
		printf(fmt, ##arg);		\
	    }					\
	}

/* Maximum size of response requested or message sent */
#define MAX_MSG_SIZE	1024
/* Maximum number of cpus expected to be specified in a cpumask */
#define MAX_CPUS	32

struct msgtemplate {
	struct nlmsghdr n;
	struct genlmsghdr g;
	char buf[MAX_MSG_SIZE];
};

char cpumask[100+6*MAX_CPUS];

static void usage(void)
{
	fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
			"[-m cpumask] [-t tgid] [-p pid]\n");
	fprintf(stderr, "  -d: print delayacct stats\n");
	fprintf(stderr, "  -i: print IO accounting (works only with -p)\n");
	fprintf(stderr, "  -l: listen forever\n");
	fprintf(stderr, "  -v: debug on\n");
}

/*
 * Create a raw netlink socket and bind
 */
static int create_nl_socket(int protocol)
{
	int fd;
	struct sockaddr_nl local;

	fd = socket(AF_NETLINK, SOCK_RAW, protocol);
	if (fd < 0)
		return -1;

	if (rcvbufsz)
		if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
				&rcvbufsz, sizeof(rcvbufsz)) < 0) {
			fprintf(stderr, "Unable to set socket rcv buf size "
					"to %d\n",
				rcvbufsz);
			return -1;
		}

	memset(&local, 0, sizeof(local));
	local.nl_family = AF_NETLINK;

	if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
		goto error;

	return fd;
error:
	close(fd);
	return -1;
}


int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
	     __u8 genl_cmd, __u16 nla_type,
	     void *nla_data, int nla_len)
{
	struct nlattr *na;
	struct sockaddr_nl nladdr;
	int r, buflen;
	char *buf;

	struct msgtemplate msg;

	msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
	msg.n.nlmsg_type = nlmsg_type;
	msg.n.nlmsg_flags = NLM_F_REQUEST;
	msg.n.nlmsg_seq = 0;
	msg.n.nlmsg_pid = nlmsg_pid;
	msg.g.cmd = genl_cmd;
	msg.g.version = 0x1;
	na = (struct nlattr *) GENLMSG_DATA(&msg);
	na->nla_type = nla_type;
	na->nla_len = nla_len + 1 + NLA_HDRLEN;
	memcpy(NLA_DATA(na), nla_data, nla_len);
	msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);

	buf = (char *) &msg;
	buflen = msg.n.nlmsg_len ;
	memset(&nladdr, 0, sizeof(nladdr));
	nladdr.nl_family = AF_NETLINK;
	while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
			   sizeof(nladdr))) < buflen) {
		if (r > 0) {
			buf += r;
			buflen -= r;
		} else if (errno != EAGAIN)
			return -1;
	}
	return 0;
}


/*
 * Probe the controller in genetlink to find the family id
 * for the TASKSTATS family
 */
int get_family_id(int sd)
{
	struct {
		struct nlmsghdr n;
		struct genlmsghdr g;
		char buf[256];
	} ans;

	int id, rc;
	struct nlattr *na;
	int rep_len;

	strcpy(name, TASKSTATS_GENL_NAME);
	rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
			CTRL_ATTR_FAMILY_NAME, (void *)name,
			strlen(TASKSTATS_GENL_NAME)+1);

	rep_len = recv(sd, &ans, sizeof(ans), 0);
	if (ans.n.nlmsg_type == NLMSG_ERROR ||
	    (rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
		return 0;

	na = (struct nlattr *) GENLMSG_DATA(&ans);
	na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
	if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
		id = *(__u16 *) NLA_DATA(na);
	}
	return id;
}

void print_delayacct(struct taskstats *t)
{
	printf("\n\nCPU   %15s%15s%15s%15s\n"
	       "      %15llu%15llu%15llu%15llu\n"
	       "IO    %15s%15s\n"
	       "      %15llu%15llu\n"
	       "MEM   %15s%15s\n"
	       "      %15llu%15llu\n"
	       "count", "real total", "virtual total", "delay total",
	       t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
	       t->cpu_delay_total,
	       "count", "delay total",
	       t->blkio_count, t->blkio_delay_total,
	       "count", "delay total", t->swapin_count, t->swapin_delay_total);
}

void task_context_switch_counts(struct taskstats *t)
{
	printf("\n\nTask   %15s%15s\n"
	       "       %15lu%15lu\n",
	       "voluntary", "nonvoluntary",
	       t->nvcsw, t->nivcsw);
}

void print_ioacct(struct taskstats *t)
{
	printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
		t->ac_comm,
		(unsigned long long)t->read_bytes,
		(unsigned long long)t->write_bytes,
		(unsigned long long)t->cancelled_write_bytes);
}

int main(int argc, char *argv[])
{
	int c, rc, rep_len, aggr_len, len2, cmd_type;
	__u16 id;
	__u32 mypid;

	struct nlattr *na;
	int nl_sd = -1;
	int len = 0;
	pid_t tid = 0;
	pid_t rtid = 0;

	int fd = 0;
	int count = 0;
	int write_file = 0;
	int maskset = 0;
	char *logfile = NULL;
	int loop = 0;

	struct msgtemplate msg;

	while (1) {
		c = getopt(argc, argv, "qdiw:r:m:t:p:vl");
		if (c < 0)
			break;

		switch (c) {
		case 'd':
			printf("print delayacct stats ON\n");
			print_delays = 1;
			break;
		case 'i':
			printf("printing IO accounting\n");
			print_io_accounting = 1;
			break;
		case 'q':
			printf("printing task/process context switch rates\n");
			print_task_context_switch_counts = 1;
			break;
		case 'w':
			logfile = strdup(optarg);
			printf("write to file %s\n", logfile);
			write_file = 1;
			break;
		case 'r':
			rcvbufsz = atoi(optarg);
			printf("receive buf size %d\n", rcvbufsz);
			if (rcvbufsz < 0)
				err(1, "Invalid rcv buf size\n");
			break;
		case 'm':
			strncpy(cpumask, optarg, sizeof(cpumask));
			maskset = 1;
			printf("cpumask %s maskset %d\n", cpumask, maskset);
			break;
		case 't':
			tid = atoi(optarg);
			if (!tid)
				err(1, "Invalid tgid\n");
			cmd_type = TASKSTATS_CMD_ATTR_TGID;
			break;
		case 'p':
			tid = atoi(optarg);
			if (!tid)
				err(1, "Invalid pid\n");
			cmd_type = TASKSTATS_CMD_ATTR_PID;
			break;
		case 'v':
			printf("debug on\n");
			dbg = 1;
			break;
		case 'l':
			printf("listen forever\n");
			loop = 1;
			break;
		default:
			usage();
			exit(-1);
		}
	}

	if (write_file) {
		fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
			  S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
		if (fd == -1) {
			perror("Cannot open output file\n");
			exit(1);
		}
	}

	if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
		err(1, "error creating Netlink socket\n");


	mypid = getpid();
	id = get_family_id(nl_sd);
	if (!id) {
		fprintf(stderr, "Error getting family id, errno %d\n", errno);
		goto err;
	}
	PRINTF("family id %d\n", id);

	if (maskset) {
		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
			      TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
			      &cpumask, strlen(cpumask) + 1);
		PRINTF("Sent register cpumask, retval %d\n", rc);
		if (rc < 0) {
			fprintf(stderr, "error sending register cpumask\n");
			goto err;
		}
	}

	if (tid) {
		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
			      cmd_type, &tid, sizeof(__u32));
		PRINTF("Sent pid/tgid, retval %d\n", rc);
		if (rc < 0) {
			fprintf(stderr, "error sending tid/tgid cmd\n");
			goto done;
		}
	}

	do {
		int i;

		rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
		PRINTF("received %d bytes\n", rep_len);

		if (rep_len < 0) {
			fprintf(stderr, "nonfatal reply error: errno %d\n",
				errno);
			continue;
		}
		if (msg.n.nlmsg_type == NLMSG_ERROR ||
		    !NLMSG_OK((&msg.n), rep_len)) {
			struct nlmsgerr *err = NLMSG_DATA(&msg);
			fprintf(stderr, "fatal reply error,  errno %d\n",
				err->error);
			goto done;
		}

		PRINTF("nlmsghdr size=%d, nlmsg_len=%d, rep_len=%d\n",
		       sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);


		rep_len = GENLMSG_PAYLOAD(&msg.n);

		na = (struct nlattr *) GENLMSG_DATA(&msg);
		len = 0;
		i = 0;
		while (len < rep_len) {
			len += NLA_ALIGN(na->nla_len);
			switch (na->nla_type) {
			case TASKSTATS_TYPE_AGGR_TGID:
				/* Fall through */
			case TASKSTATS_TYPE_AGGR_PID:
				aggr_len = NLA_PAYLOAD(na->nla_len);
				len2 = 0;
				/* For nested attributes, na follows */
				na = (struct nlattr *) NLA_DATA(na);
				done = 0;
				while (len2 < aggr_len) {
					switch (na->nla_type) {
					case TASKSTATS_TYPE_PID:
						rtid = *(int *) NLA_DATA(na);
						if (print_delays)
							printf("PID\t%d\n", rtid);
						break;
					case TASKSTATS_TYPE_TGID:
						rtid = *(int *) NLA_DATA(na);
						if (print_delays)
							printf("TGID\t%d\n", rtid);
						break;
					case TASKSTATS_TYPE_STATS:
						count++;
						if (print_delays)
							print_delayacct((struct taskstats *) NLA_DATA(na));
						if (print_io_accounting)
							print_ioacct((struct taskstats *) NLA_DATA(na));
						if (print_task_context_switch_counts)
							task_context_switch_counts((struct taskstats *) NLA_DATA(na));
						if (fd) {
							if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
								err(1,"write error\n");
							}
						}
						if (!loop)
							goto done;
						break;
					default:
						fprintf(stderr, "Unknown nested"
							" nla_type %d\n",
							na->nla_type);
						break;
					}
					len2 += NLA_ALIGN(na->nla_len);
					na = (struct nlattr *) ((char *) na + len2);
				}
				break;

			default:
				fprintf(stderr, "Unknown nla_type %d\n",
					na->nla_type);
				break;
			}
			na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
		}
	} while (loop);
done:
	if (maskset) {
		rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
			      TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
			      &cpumask, strlen(cpumask) + 1);
		printf("Sent deregister mask, retval %d\n", rc);
		if (rc < 0)
			err(rc, "error sending deregister cpumask\n");
	}
err:
	close(nl_sd);
	if (fd)
		close(fd);
	return 0;
}
Commit	Line	Data
a3baf649 SN	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
9e06d3f9	8	* Copyright (c) Jay Lan, SGI. 2006
a3baf649	9	*
d2f7bf13 AM	10	* Compile with
d2f7bf13 AM	11	* gcc -I/usr/src/linux/include getdelays.c -o getdelays
a3baf649 SN	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/types.h>
	25	#include <signal.h>
	26
	27	#include <linux/genetlink.h>
	28	#include <linux/taskstats.h>
	29
	30	/*
	31	* Generic macros for dealing with netlink sockets. Might be duplicated
	32	* elsewhere. It is recommended that commercial grade applications use
	33	* libnl or libnetlink and use the interfaces provided by the library
	34	*/
	35	#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
	36	#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
	37	#define NLA_DATA(na) ((void )((char)(na) + NLA_HDRLEN))
	38	#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
	39
d2f7bf13 AM	40	#define err(code, fmt, arg...) \
	41	do { \
	42	fprintf(stderr, fmt, ##arg); \
	43	exit(code); \
	44	} while (0)
	45
	46	int done;
	47	int rcvbufsz;
	48	char name[100];
	49	int dbg;
	50	int print_delays;
cf709844	51	int print_io_accounting;
b663a79c	52	int print_task_context_switch_counts;
9e06d3f9	53	__u64 stime, utime;
d2f7bf13	54
9e06d3f9 SN	55	#define PRINTF(fmt, arg...) { \
	56	if (dbg) { \
	57	printf(fmt, ##arg); \
	58	} \
	59	}
	60
	61	/* Maximum size of response requested or message sent */
88040230	62	#define MAX_MSG_SIZE 1024
9e06d3f9 SN	63	/* Maximum number of cpus expected to be specified in a cpumask */
9e06d3f9 SN	64	#define MAX_CPUS 32
9e06d3f9 SN	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];
a3baf649	73
f16825bb RD	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	}
	83
a3baf649 SN	84	/*
	85	* Create a raw netlink socket and bind
	86	*/
9e06d3f9	87	static int create_nl_socket(int protocol)
a3baf649	88	{
9e06d3f9 SN	89	int fd;
	90	struct sockaddr_nl local;
	91
	92	fd = socket(AF_NETLINK, SOCK_RAW, protocol);
	93	if (fd < 0)
	94	return -1;
	95
	96	if (rcvbufsz)
	97	if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
	98	&rcvbufsz, sizeof(rcvbufsz)) < 0) {
d2f7bf13 AM	99	fprintf(stderr, "Unable to set socket rcv buf size "
	100	"to %d\n",
	101	rcvbufsz);
9e06d3f9 SN	102	return -1;
9e06d3f9 SN	103	}
a3baf649	104
9e06d3f9 SN	105	memset(&local, 0, sizeof(local));
9e06d3f9 SN	106	local.nl_family = AF_NETLINK;
a3baf649	107
9e06d3f9 SN	108	if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
9e06d3f9 SN	109	goto error;
a3baf649	110
9e06d3f9 SN	111	return fd;
	112	error:
	113	close(fd);
	114	return -1;
a3baf649 SN	115	}
a3baf649 SN	116
9e06d3f9 SN	117
	118	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)
a3baf649	121	{
9e06d3f9 SN	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;
a3baf649 SN	155	}
a3baf649 SN	156
9e06d3f9	157
a3baf649 SN	158	/*
	159	* Probe the controller in genetlink to find the family id
	160	* for the TASKSTATS family
	161	*/
	162	int get_family_id(int sd)
	163	{
9e06d3f9 SN	164	struct {
	165	struct nlmsghdr n;
	166	struct genlmsghdr g;
	167	char buf[256];
	168	} ans;
	169
	170	int id, 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
	179	rep_len = recv(sd, &ans, sizeof(ans), 0);
	180	if (ans.n.nlmsg_type == NLMSG_ERROR \|\|
	181	(rep_len < 0) \|\| !NLMSG_OK((&ans.n), rep_len))
	182	return 0;
a3baf649	183
9e06d3f9 SN	184	na = (struct nlattr *) GENLMSG_DATA(&ans);
	185	na = (struct nlattr ) ((char ) na + NLA_ALIGN(na->nla_len));
	186	if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
	187	id = (__u16 ) NLA_DATA(na);
	188	}
	189	return id;
a3baf649 SN	190	}
a3baf649 SN	191
9e06d3f9	192	void print_delayacct(struct taskstats *t)
a3baf649	193	{
9e06d3f9 SN	194	printf("\n\nCPU %15s%15s%15s%15s\n"
	195	" %15llu%15llu%15llu%15llu\n"
	196	"IO %15s%15s\n"
	197	" %15llu%15llu\n"
	198	"MEM %15s%15s\n"
b663a79c	199	" %15llu%15llu\n"
9e06d3f9 SN	200	"count", "real total", "virtual total", "delay total",
	201	t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
	202	t->cpu_delay_total,
	203	"count", "delay total",
	204	t->blkio_count, t->blkio_delay_total,
	205	"count", "delay total", t->swapin_count, t->swapin_delay_total);
a3baf649 SN	206	}
a3baf649 SN	207
b663a79c MU	208	void task_context_switch_counts(struct taskstats *t)
	209	{
	210	printf("\n\nTask %15s%15s\n"
	211	" %15lu%15lu\n",
	212	"voluntary", "nonvoluntary",
	213	t->nvcsw, t->nivcsw);
	214	}
	215
cf709844 AM	216	void print_ioacct(struct taskstats *t)
	217	{
	218	printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
	219	t->ac_comm,
	220	(unsigned long long)t->read_bytes,
	221	(unsigned long long)t->write_bytes,
	222	(unsigned long long)t->cancelled_write_bytes);
	223	}
	224
a3baf649 SN	225	int main(int argc, char *argv[])
a3baf649 SN	226	{
9e06d3f9 SN	227	int c, rc, rep_len, aggr_len, len2, cmd_type;
	228	__u16 id;
	229	__u32 mypid;
	230
	231	struct nlattr *na;
	232	int nl_sd = -1;
	233	int len = 0;
	234	pid_t tid = 0;
	235	pid_t rtid = 0;
	236
	237	int fd = 0;
	238	int count = 0;
	239	int write_file = 0;
	240	int maskset = 0;
7f76c403	241	char *logfile = NULL;
9e06d3f9 SN	242	int loop = 0;
	243
	244	struct msgtemplate msg;
	245
	246	while (1) {
b663a79c	247	c = getopt(argc, argv, "qdiw:r:m:t:p:vl");
9e06d3f9 SN	248	if (c < 0)
9e06d3f9 SN	249	break;
a3baf649	250
9e06d3f9 SN	251	switch (c) {
	252	case 'd':
	253	printf("print delayacct stats ON\n");
	254	print_delays = 1;
	255	break;
cf709844 AM	256	case 'i':
	257	printf("printing IO accounting\n");
	258	print_io_accounting = 1;
	259	break;
b663a79c MU	260	case 'q':
	261	printf("printing task/process context switch rates\n");
	262	print_task_context_switch_counts = 1;
	263	break;
9e06d3f9	264	case 'w':
7f76c403	265	logfile = strdup(optarg);
9e06d3f9 SN	266	printf("write to file %s\n", logfile);
	267	write_file = 1;
	268	break;
	269	case 'r':
	270	rcvbufsz = atoi(optarg);
	271	printf("receive buf size %d\n", rcvbufsz);
	272	if (rcvbufsz < 0)
	273	err(1, "Invalid rcv buf size\n");
	274	break;
	275	case 'm':
	276	strncpy(cpumask, optarg, sizeof(cpumask));
	277	maskset = 1;
	278	printf("cpumask %s maskset %d\n", cpumask, maskset);
	279	break;
	280	case 't':
	281	tid = atoi(optarg);
	282	if (!tid)
	283	err(1, "Invalid tgid\n");
	284	cmd_type = TASKSTATS_CMD_ATTR_TGID;
9e06d3f9 SN	285	break;
	286	case 'p':
	287	tid = atoi(optarg);
	288	if (!tid)
	289	err(1, "Invalid pid\n");
	290	cmd_type = TASKSTATS_CMD_ATTR_PID;
9e06d3f9 SN	291	break;
	292	case 'v':
	293	printf("debug on\n");
	294	dbg = 1;
	295	break;
	296	case 'l':
	297	printf("listen forever\n");
	298	loop = 1;
	299	break;
	300	default:
f16825bb	301	usage();
9e06d3f9	302	exit(-1);
a3baf649	303	}
a3baf649	304	}
a3baf649	305
9e06d3f9 SN	306	if (write_file) {
	307	fd = open(logfile, O_WRONLY \| O_CREAT \| O_TRUNC,
	308	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IROTH);
	309	if (fd == -1) {
	310	perror("Cannot open output file\n");
	311	exit(1);
	312	}
	313	}
a3baf649	314
9e06d3f9 SN	315	if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
9e06d3f9 SN	316	err(1, "error creating Netlink socket\n");
a3baf649	317
a3baf649	318
9e06d3f9 SN	319	mypid = getpid();
	320	id = get_family_id(nl_sd);
	321	if (!id) {
d2f7bf13	322	fprintf(stderr, "Error getting family id, errno %d\n", errno);
9e06d3f9	323	goto err;
a3baf649	324	}
9e06d3f9 SN	325	PRINTF("family id %d\n", id);
	326
	327	if (maskset) {
	328	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	329	TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
7d1bdca9	330	&cpumask, strlen(cpumask) + 1);
9e06d3f9 SN	331	PRINTF("Sent register cpumask, retval %d\n", rc);
9e06d3f9 SN	332	if (rc < 0) {
d2f7bf13	333	fprintf(stderr, "error sending register cpumask\n");
9e06d3f9 SN	334	goto err;
9e06d3f9 SN	335	}
a3baf649 SN	336	}
a3baf649 SN	337
9e06d3f9 SN	338	if (tid) {
	339	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	340	cmd_type, &tid, sizeof(__u32));
	341	PRINTF("Sent pid/tgid, retval %d\n", rc);
	342	if (rc < 0) {
d2f7bf13	343	fprintf(stderr, "error sending tid/tgid cmd\n");
9e06d3f9 SN	344	goto done;
9e06d3f9 SN	345	}
a3baf649 SN	346	}
a3baf649 SN	347
9e06d3f9 SN	348	do {
9e06d3f9 SN	349	int i;
a3baf649	350
9e06d3f9 SN	351	rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
9e06d3f9 SN	352	PRINTF("received %d bytes\n", rep_len);
a3baf649	353
9e06d3f9	354	if (rep_len < 0) {
d2f7bf13 AM	355	fprintf(stderr, "nonfatal reply error: errno %d\n",
d2f7bf13 AM	356	errno);
9e06d3f9 SN	357	continue;
	358	}
	359	if (msg.n.nlmsg_type == NLMSG_ERROR \|\|
	360	!NLMSG_OK((&msg.n), rep_len)) {
7d1bdca9	361	struct nlmsgerr *err = NLMSG_DATA(&msg);
d2f7bf13 AM	362	fprintf(stderr, "fatal reply error, errno %d\n",
d2f7bf13 AM	363	err->error);
9e06d3f9 SN	364	goto done;
	365	}
	366
	367	PRINTF("nlmsghdr size=%d, nlmsg_len=%d, rep_len=%d\n",
	368	sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
	369
	370
	371	rep_len = GENLMSG_PAYLOAD(&msg.n);
	372
	373	na = (struct nlattr *) GENLMSG_DATA(&msg);
	374	len = 0;
	375	i = 0;
	376	while (len < rep_len) {
	377	len += NLA_ALIGN(na->nla_len);
	378	switch (na->nla_type) {
	379	case TASKSTATS_TYPE_AGGR_TGID:
	380	/* Fall through */
	381	case TASKSTATS_TYPE_AGGR_PID:
	382	aggr_len = NLA_PAYLOAD(na->nla_len);
	383	len2 = 0;
	384	/* For nested attributes, na follows */
	385	na = (struct nlattr *) NLA_DATA(na);
	386	done = 0;
	387	while (len2 < aggr_len) {
	388	switch (na->nla_type) {
	389	case TASKSTATS_TYPE_PID:
	390	rtid = (int ) NLA_DATA(na);
	391	if (print_delays)
	392	printf("PID\t%d\n", rtid);
	393	break;
	394	case TASKSTATS_TYPE_TGID:
	395	rtid = (int ) NLA_DATA(na);
	396	if (print_delays)
	397	printf("TGID\t%d\n", rtid);
	398	break;
	399	case TASKSTATS_TYPE_STATS:
	400	count++;
	401	if (print_delays)
	402	print_delayacct((struct taskstats *) NLA_DATA(na));
cf709844 AM	403	if (print_io_accounting)
cf709844 AM	404	print_ioacct((struct taskstats *) NLA_DATA(na));
b663a79c MU	405	if (print_task_context_switch_counts)
b663a79c MU	406	task_context_switch_counts((struct taskstats *) NLA_DATA(na));
9e06d3f9 SN	407	if (fd) {
	408	if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
	409	err(1,"write error\n");
	410	}
	411	}
	412	if (!loop)
	413	goto done;
	414	break;
	415	default:
d2f7bf13 AM	416	fprintf(stderr, "Unknown nested"
	417	" nla_type %d\n",
	418	na->nla_type);
9e06d3f9 SN	419	break;
	420	}
	421	len2 += NLA_ALIGN(na->nla_len);
	422	na = (struct nlattr ) ((char ) na + len2);
	423	}
	424	break;
	425
	426	default:
d2f7bf13 AM	427	fprintf(stderr, "Unknown nla_type %d\n",
d2f7bf13 AM	428	na->nla_type);
9e06d3f9	429	break;
a3baf649	430	}
9e06d3f9	431	na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
a3baf649	432	}
9e06d3f9 SN	433	} while (loop);
	434	done:
	435	if (maskset) {
	436	rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
	437	TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
7d1bdca9	438	&cpumask, strlen(cpumask) + 1);
9e06d3f9 SN	439	printf("Sent deregister mask, retval %d\n", rc);
	440	if (rc < 0)
	441	err(rc, "error sending deregister cpumask\n");
a3baf649	442	}
9e06d3f9 SN	443	err:
	444	close(nl_sd);
	445	if (fd)
	446	close(fd);
	447	return 0;
a3baf649	448	}