426 lines
9.6 KiB
C
426 lines
9.6 KiB
C
/* getdelays.c
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*
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* Utility to get per-pid and per-tgid delay accounting statistics
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* Also illustrates usage of the taskstats interface
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*
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* Copyright (C) Shailabh Nagar, IBM Corp. 2005
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* Copyright (C) Balbir Singh, IBM Corp. 2006
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* Copyright (c) Jay Lan, SGI. 2006
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*
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* Compile with
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* gcc -I/usr/src/linux/include getdelays.c -o getdelays
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <poll.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <linux/genetlink.h>
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#include <linux/taskstats.h>
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/*
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* Generic macros for dealing with netlink sockets. Might be duplicated
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* elsewhere. It is recommended that commercial grade applications use
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* libnl or libnetlink and use the interfaces provided by the library
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*/
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#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
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#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
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#define NLA_DATA(na) ((void *)((char*)(na) + NLA_HDRLEN))
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#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
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#define err(code, fmt, arg...) \
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do { \
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fprintf(stderr, fmt, ##arg); \
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exit(code); \
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} while (0)
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int done;
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int rcvbufsz;
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char name[100];
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int dbg;
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int print_delays;
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int print_io_accounting;
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__u64 stime, utime;
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#define PRINTF(fmt, arg...) { \
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if (dbg) { \
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printf(fmt, ##arg); \
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} \
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}
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/* Maximum size of response requested or message sent */
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#define MAX_MSG_SIZE 1024
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/* Maximum number of cpus expected to be specified in a cpumask */
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#define MAX_CPUS 32
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/* Maximum length of pathname to log file */
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#define MAX_FILENAME 256
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struct msgtemplate {
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struct nlmsghdr n;
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struct genlmsghdr g;
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char buf[MAX_MSG_SIZE];
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};
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char cpumask[100+6*MAX_CPUS];
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/*
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* Create a raw netlink socket and bind
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*/
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static int create_nl_socket(int protocol)
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{
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int fd;
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struct sockaddr_nl local;
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fd = socket(AF_NETLINK, SOCK_RAW, protocol);
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if (fd < 0)
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return -1;
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if (rcvbufsz)
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if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
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&rcvbufsz, sizeof(rcvbufsz)) < 0) {
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fprintf(stderr, "Unable to set socket rcv buf size "
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"to %d\n",
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rcvbufsz);
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return -1;
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}
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memset(&local, 0, sizeof(local));
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local.nl_family = AF_NETLINK;
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if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
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goto error;
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return fd;
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error:
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close(fd);
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return -1;
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}
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int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
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__u8 genl_cmd, __u16 nla_type,
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void *nla_data, int nla_len)
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{
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struct nlattr *na;
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struct sockaddr_nl nladdr;
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int r, buflen;
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char *buf;
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struct msgtemplate msg;
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msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
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msg.n.nlmsg_type = nlmsg_type;
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msg.n.nlmsg_flags = NLM_F_REQUEST;
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msg.n.nlmsg_seq = 0;
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msg.n.nlmsg_pid = nlmsg_pid;
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msg.g.cmd = genl_cmd;
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msg.g.version = 0x1;
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na = (struct nlattr *) GENLMSG_DATA(&msg);
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na->nla_type = nla_type;
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na->nla_len = nla_len + 1 + NLA_HDRLEN;
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memcpy(NLA_DATA(na), nla_data, nla_len);
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msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
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buf = (char *) &msg;
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buflen = msg.n.nlmsg_len ;
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
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sizeof(nladdr))) < buflen) {
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if (r > 0) {
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buf += r;
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buflen -= r;
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} else if (errno != EAGAIN)
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return -1;
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}
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return 0;
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}
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/*
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* Probe the controller in genetlink to find the family id
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* for the TASKSTATS family
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*/
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int get_family_id(int sd)
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{
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struct {
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struct nlmsghdr n;
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struct genlmsghdr g;
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char buf[256];
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} ans;
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int id, rc;
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struct nlattr *na;
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int rep_len;
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strcpy(name, TASKSTATS_GENL_NAME);
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rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
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CTRL_ATTR_FAMILY_NAME, (void *)name,
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strlen(TASKSTATS_GENL_NAME)+1);
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rep_len = recv(sd, &ans, sizeof(ans), 0);
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if (ans.n.nlmsg_type == NLMSG_ERROR ||
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(rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
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return 0;
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na = (struct nlattr *) GENLMSG_DATA(&ans);
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na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
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if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
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id = *(__u16 *) NLA_DATA(na);
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}
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return id;
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}
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void print_delayacct(struct taskstats *t)
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{
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printf("\n\nCPU %15s%15s%15s%15s\n"
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" %15llu%15llu%15llu%15llu\n"
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"IO %15s%15s\n"
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" %15llu%15llu\n"
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"MEM %15s%15s\n"
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" %15llu%15llu\n\n",
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"count", "real total", "virtual total", "delay total",
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t->cpu_count, t->cpu_run_real_total, t->cpu_run_virtual_total,
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t->cpu_delay_total,
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"count", "delay total",
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t->blkio_count, t->blkio_delay_total,
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"count", "delay total", t->swapin_count, t->swapin_delay_total);
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}
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void print_ioacct(struct taskstats *t)
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{
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printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
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t->ac_comm,
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(unsigned long long)t->read_bytes,
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(unsigned long long)t->write_bytes,
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(unsigned long long)t->cancelled_write_bytes);
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}
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int main(int argc, char *argv[])
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{
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int c, rc, rep_len, aggr_len, len2, cmd_type;
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__u16 id;
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__u32 mypid;
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struct nlattr *na;
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int nl_sd = -1;
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int len = 0;
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pid_t tid = 0;
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pid_t rtid = 0;
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int fd = 0;
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int count = 0;
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int write_file = 0;
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int maskset = 0;
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char logfile[128];
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int loop = 0;
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struct msgtemplate msg;
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while (1) {
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c = getopt(argc, argv, "diw:r:m:t:p:v:l");
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if (c < 0)
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break;
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switch (c) {
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case 'd':
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printf("print delayacct stats ON\n");
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print_delays = 1;
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break;
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case 'i':
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printf("printing IO accounting\n");
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print_io_accounting = 1;
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break;
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case 'w':
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strncpy(logfile, optarg, MAX_FILENAME);
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printf("write to file %s\n", logfile);
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write_file = 1;
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break;
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case 'r':
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rcvbufsz = atoi(optarg);
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printf("receive buf size %d\n", rcvbufsz);
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if (rcvbufsz < 0)
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err(1, "Invalid rcv buf size\n");
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break;
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case 'm':
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strncpy(cpumask, optarg, sizeof(cpumask));
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maskset = 1;
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printf("cpumask %s maskset %d\n", cpumask, maskset);
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break;
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case 't':
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tid = atoi(optarg);
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if (!tid)
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err(1, "Invalid tgid\n");
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cmd_type = TASKSTATS_CMD_ATTR_TGID;
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break;
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case 'p':
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tid = atoi(optarg);
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if (!tid)
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err(1, "Invalid pid\n");
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cmd_type = TASKSTATS_CMD_ATTR_PID;
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break;
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case 'v':
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printf("debug on\n");
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dbg = 1;
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break;
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case 'l':
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printf("listen forever\n");
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loop = 1;
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break;
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default:
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printf("Unknown option %d\n", c);
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exit(-1);
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}
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}
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if (write_file) {
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fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
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S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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if (fd == -1) {
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perror("Cannot open output file\n");
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exit(1);
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}
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}
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if ((nl_sd = create_nl_socket(NETLINK_GENERIC)) < 0)
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err(1, "error creating Netlink socket\n");
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mypid = getpid();
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id = get_family_id(nl_sd);
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if (!id) {
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fprintf(stderr, "Error getting family id, errno %d\n", errno);
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goto err;
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}
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PRINTF("family id %d\n", id);
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if (maskset) {
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rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
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TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
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&cpumask, strlen(cpumask) + 1);
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PRINTF("Sent register cpumask, retval %d\n", rc);
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if (rc < 0) {
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fprintf(stderr, "error sending register cpumask\n");
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goto err;
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}
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}
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if (tid) {
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rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
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cmd_type, &tid, sizeof(__u32));
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PRINTF("Sent pid/tgid, retval %d\n", rc);
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if (rc < 0) {
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fprintf(stderr, "error sending tid/tgid cmd\n");
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goto done;
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}
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}
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do {
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int i;
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rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
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PRINTF("received %d bytes\n", rep_len);
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if (rep_len < 0) {
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fprintf(stderr, "nonfatal reply error: errno %d\n",
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errno);
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continue;
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}
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if (msg.n.nlmsg_type == NLMSG_ERROR ||
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!NLMSG_OK((&msg.n), rep_len)) {
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struct nlmsgerr *err = NLMSG_DATA(&msg);
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fprintf(stderr, "fatal reply error, errno %d\n",
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err->error);
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goto done;
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}
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PRINTF("nlmsghdr size=%d, nlmsg_len=%d, rep_len=%d\n",
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sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
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rep_len = GENLMSG_PAYLOAD(&msg.n);
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na = (struct nlattr *) GENLMSG_DATA(&msg);
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len = 0;
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i = 0;
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while (len < rep_len) {
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len += NLA_ALIGN(na->nla_len);
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switch (na->nla_type) {
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case TASKSTATS_TYPE_AGGR_TGID:
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/* Fall through */
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case TASKSTATS_TYPE_AGGR_PID:
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aggr_len = NLA_PAYLOAD(na->nla_len);
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len2 = 0;
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/* For nested attributes, na follows */
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na = (struct nlattr *) NLA_DATA(na);
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done = 0;
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while (len2 < aggr_len) {
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switch (na->nla_type) {
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case TASKSTATS_TYPE_PID:
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rtid = *(int *) NLA_DATA(na);
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if (print_delays)
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printf("PID\t%d\n", rtid);
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break;
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case TASKSTATS_TYPE_TGID:
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rtid = *(int *) NLA_DATA(na);
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if (print_delays)
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printf("TGID\t%d\n", rtid);
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break;
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case TASKSTATS_TYPE_STATS:
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count++;
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if (print_delays)
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print_delayacct((struct taskstats *) NLA_DATA(na));
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if (print_io_accounting)
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print_ioacct((struct taskstats *) NLA_DATA(na));
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if (fd) {
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if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
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err(1,"write error\n");
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}
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}
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if (!loop)
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goto done;
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break;
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default:
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fprintf(stderr, "Unknown nested"
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" nla_type %d\n",
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na->nla_type);
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break;
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}
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len2 += NLA_ALIGN(na->nla_len);
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na = (struct nlattr *) ((char *) na + len2);
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}
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break;
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default:
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fprintf(stderr, "Unknown nla_type %d\n",
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na->nla_type);
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break;
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}
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na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
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}
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} while (loop);
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done:
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if (maskset) {
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rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
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TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
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&cpumask, strlen(cpumask) + 1);
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printf("Sent deregister mask, retval %d\n", rc);
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if (rc < 0)
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err(rc, "error sending deregister cpumask\n");
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}
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err:
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close(nl_sd);
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if (fd)
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close(fd);
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return 0;
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}
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