X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=Documentation%2Faccounting%2Fgetdelays.c;fp=Documentation%2Faccounting%2Fgetdelays.c;h=795ca3911cc58f7fd043a6e51b95df8e9bff449f;hb=f05f9504c50ed069377d37f02f22e7a16b5921de;hp=0000000000000000000000000000000000000000;hpb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;p=linux-2.6.git

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
new file mode 100644
index 000000000..795ca3911
--- /dev/null
+++ b/Documentation/accounting/getdelays.c
@@ -0,0 +1,396 @@
+/* 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
+ *
+ */
+
+#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 { printf(fmt, ##arg); exit(code); } while (0)
+int done = 0;
+int rcvbufsz=0;
+
+    char name[100];
+int dbg=0, print_delays=0;
+__u64 stime, utime;
+#define PRINTF(fmt, arg...) {			\
+	    if (dbg) {				\
+		printf(fmt, ##arg);		\
+	    }					\
+	}
+
+/* Maximum size of response requested or message sent */
+#define MAX_MSG_SIZE	256
+/* Maximum number of cpus expected to be specified in a cpumask */
+#define MAX_CPUS	32
+/* Maximum length of pathname to log file */
+#define MAX_FILENAME	256
+
+struct msgtemplate {
+	struct nlmsghdr n;
+	struct genlmsghdr g;
+	char buf[MAX_MSG_SIZE];
+};
+
+char cpumask[100+6*MAX_CPUS];
+
+/*
+ * 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) {
+			printf("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\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);
+}
+
+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[128];
+	int loop = 0;
+
+	struct msgtemplate msg;
+
+	while (1) {
+		c = getopt(argc, argv, "dw:r:m:t:p:v:l");
+		if (c < 0)
+			break;
+
+		switch (c) {
+		case 'd':
+			printf("print delayacct stats ON\n");
+			print_delays = 1;
+			break;
+		case 'w':
+			strncpy(logfile, optarg, MAX_FILENAME);
+			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;
+			print_delays = 1;
+			break;
+		case 'p':
+			tid = atoi(optarg);
+			if (!tid)
+				err(1, "Invalid pid\n");
+			cmd_type = TASKSTATS_CMD_ATTR_PID;
+			print_delays = 1;
+			break;
+		case 'v':
+			printf("debug on\n");
+			dbg = 1;
+			break;
+		case 'l':
+			printf("listen forever\n");
+			loop = 1;
+			break;
+		default:
+			printf("Unknown option %d\n", c);
+			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) {
+		printf("Error getting family id, errno %d", 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, sizeof(cpumask));
+		PRINTF("Sent register cpumask, retval %d\n", rc);
+		if (rc < 0) {
+			printf("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) {
+			printf("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) {
+			printf("nonfatal reply error: errno %d\n", errno);
+			continue;
+		}
+		if (msg.n.nlmsg_type == NLMSG_ERROR ||
+		    !NLMSG_OK((&msg.n), rep_len)) {
+			printf("fatal reply error,  errno %d\n", errno);
+			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 (fd) {
+							if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
+								err(1,"write error\n");
+							}
+						}
+						if (!loop)
+							goto done;
+						break;
+					default:
+						printf("Unknown nested nla_type %d\n", na->nla_type);
+						break;
+					}
+					len2 += NLA_ALIGN(na->nla_len);
+					na = (struct nlattr *) ((char *) na + len2);
+				}
+				break;
+
+			default:
+				printf("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, sizeof(cpumask));
+		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;
+}