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557 lines
14 KiB
557 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* 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/wait.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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#include <linux/cgroupstats.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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int print_task_context_switch_counts; |
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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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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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static void usage(void) |
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{ |
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fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] " |
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"[-m cpumask] [-t tgid] [-p pid]\n"); |
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fprintf(stderr, " -d: print delayacct stats\n"); |
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fprintf(stderr, " -i: print IO accounting (works only with -p)\n"); |
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fprintf(stderr, " -l: listen forever\n"); |
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fprintf(stderr, " -v: debug on\n"); |
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fprintf(stderr, " -C: container path\n"); |
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} |
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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 to %d\n", |
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rcvbufsz); |
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goto error; |
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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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static 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 + 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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static 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 = 0, 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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if (rc < 0) |
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return 0; /* sendto() failure? */ |
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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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#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1)) |
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static void print_delayacct(struct taskstats *t) |
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{ |
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printf("\n\nCPU %15s%15s%15s%15s%15s\n" |
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" %15llu%15llu%15llu%15llu%15.3fms\n" |
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"IO %15s%15s%15s\n" |
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" %15llu%15llu%15llums\n" |
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"SWAP %15s%15s%15s\n" |
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" %15llu%15llu%15llums\n" |
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"RECLAIM %12s%15s%15s\n" |
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" %15llu%15llu%15llums\n" |
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"THRASHING%12s%15s%15s\n" |
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" %15llu%15llu%15llums\n", |
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"count", "real total", "virtual total", |
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"delay total", "delay average", |
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(unsigned long long)t->cpu_count, |
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(unsigned long long)t->cpu_run_real_total, |
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(unsigned long long)t->cpu_run_virtual_total, |
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(unsigned long long)t->cpu_delay_total, |
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average_ms((double)t->cpu_delay_total, t->cpu_count), |
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"count", "delay total", "delay average", |
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(unsigned long long)t->blkio_count, |
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(unsigned long long)t->blkio_delay_total, |
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average_ms(t->blkio_delay_total, t->blkio_count), |
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"count", "delay total", "delay average", |
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(unsigned long long)t->swapin_count, |
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(unsigned long long)t->swapin_delay_total, |
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average_ms(t->swapin_delay_total, t->swapin_count), |
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"count", "delay total", "delay average", |
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(unsigned long long)t->freepages_count, |
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(unsigned long long)t->freepages_delay_total, |
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average_ms(t->freepages_delay_total, t->freepages_count), |
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"count", "delay total", "delay average", |
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(unsigned long long)t->thrashing_count, |
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(unsigned long long)t->thrashing_delay_total, |
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average_ms(t->thrashing_delay_total, t->thrashing_count)); |
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} |
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static void task_context_switch_counts(struct taskstats *t) |
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{ |
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printf("\n\nTask %15s%15s\n" |
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" %15llu%15llu\n", |
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"voluntary", "nonvoluntary", |
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(unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw); |
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} |
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static void print_cgroupstats(struct cgroupstats *c) |
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{ |
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printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, " |
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"uninterruptible %llu\n", (unsigned long long)c->nr_sleeping, |
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(unsigned long long)c->nr_io_wait, |
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(unsigned long long)c->nr_running, |
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(unsigned long long)c->nr_stopped, |
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(unsigned long long)c->nr_uninterruptible); |
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} |
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static 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; |
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int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC; |
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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 = NULL; |
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int loop = 0; |
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int containerset = 0; |
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char *containerpath = NULL; |
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int cfd = 0; |
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int forking = 0; |
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sigset_t sigset; |
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struct msgtemplate msg; |
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while (!forking) { |
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c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:"); |
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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 'q': |
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printf("printing task/process context switch rates\n"); |
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print_task_context_switch_counts = 1; |
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break; |
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case 'C': |
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containerset = 1; |
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containerpath = optarg; |
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break; |
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case 'w': |
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logfile = strdup(optarg); |
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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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cpumask[sizeof(cpumask) - 1] = '\0'; |
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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 'c': |
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/* Block SIGCHLD for sigwait() later */ |
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if (sigemptyset(&sigset) == -1) |
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err(1, "Failed to empty sigset"); |
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if (sigaddset(&sigset, SIGCHLD)) |
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err(1, "Failed to set sigchld in sigset"); |
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sigprocmask(SIG_BLOCK, &sigset, NULL); |
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/* fork/exec a child */ |
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tid = fork(); |
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if (tid < 0) |
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err(1, "Fork failed\n"); |
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if (tid == 0) |
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if (execvp(argv[optind - 1], |
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&argv[optind - 1]) < 0) |
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exit(-1); |
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/* Set the command type and avoid further processing */ |
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cmd_type = TASKSTATS_CMD_ATTR_PID; |
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forking = 1; |
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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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usage(); |
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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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nl_sd = create_nl_socket(NETLINK_GENERIC); |
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if (nl_sd < 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 && containerset) { |
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fprintf(stderr, "Select either -t or -C, not both\n"); |
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goto err; |
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} |
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/* |
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* If we forked a child, wait for it to exit. Cannot use waitpid() |
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* as all the delicious data would be reaped as part of the wait |
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*/ |
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if (tid && forking) { |
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int sig_received; |
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sigwait(&sigset, &sig_received); |
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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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if (containerset) { |
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cfd = open(containerpath, O_RDONLY); |
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if (cfd < 0) { |
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perror("error opening container file"); |
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goto err; |
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} |
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rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET, |
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CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32)); |
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if (rc < 0) { |
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perror("error sending cgroupstats command"); |
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goto err; |
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} |
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} |
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if (!maskset && !tid && !containerset) { |
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usage(); |
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goto err; |
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} |
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do { |
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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=%zu, 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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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 (print_task_context_switch_counts) |
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task_context_switch_counts((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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case TASKSTATS_TYPE_NULL: |
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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 + |
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NLA_ALIGN(na->nla_len)); |
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} |
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break; |
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case CGROUPSTATS_TYPE_CGROUP_STATS: |
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print_cgroupstats(NLA_DATA(na)); |
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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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case TASKSTATS_TYPE_NULL: |
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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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if (cfd) |
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close(cfd); |
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return 0; |
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}
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