| /* 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 <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; |
| } |