380 lines
13 KiB
C
380 lines
13 KiB
C
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/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Linux task stats reporting tool. Queries and prints out the kernel's
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* taskstats structure for a given process or thread group id. See
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* https://www.kernel.org/doc/Documentation/accounting/ for more information
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* about the reported fields.
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <netlink/attr.h>
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#include <netlink/genl/genl.h>
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#include <netlink/handlers.h>
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#include <netlink/msg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/cdefs.h>
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#include <time.h>
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#include <unistd.h>
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#include <linux/taskstats.h>
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struct TaskStatistics {
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int pid;
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int tgid;
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struct taskstats stats;
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};
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int send_command(struct nl_sock* netlink_socket, uint16_t nlmsg_type,
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uint32_t nlmsg_pid, uint8_t genl_cmd, uint16_t nla_type,
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void* nla_data, int nla_len) {
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struct nl_msg* message = nlmsg_alloc();
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int seq = 0;
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int version = 1;
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int header_length = 0;
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int flags = NLM_F_REQUEST;
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genlmsg_put(message, nlmsg_pid, seq, nlmsg_type, header_length, flags,
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genl_cmd, version);
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nla_put(message, nla_type, nla_len, nla_data);
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/* Override the header flags since we don't want NLM_F_ACK. */
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struct nlmsghdr* header = nlmsg_hdr(message);
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header->nlmsg_flags = flags;
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int result = nl_send(netlink_socket, message);
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nlmsg_free(message);
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return result;
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}
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int print_receive_error(struct sockaddr_nl* address __unused,
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struct nlmsgerr* error, void* arg __unused) {
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fprintf(stderr, "Netlink receive error: %s\n", strerror(-error->error));
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return NL_STOP;
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}
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int parse_family_id(struct nl_msg* msg, void* arg) {
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struct genlmsghdr* gnlh = (struct genlmsghdr*)nlmsg_data(nlmsg_hdr(msg));
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struct nlattr* attr = genlmsg_attrdata(gnlh, 0);
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int remaining = genlmsg_attrlen(gnlh, 0);
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do {
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if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
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*((int*)arg) = nla_get_u16(attr);
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return NL_STOP;
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}
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} while ((attr = nla_next(attr, &remaining)));
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return NL_OK;
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}
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int get_family_id(struct nl_sock* netlink_socket, const char* name) {
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if (send_command(netlink_socket, GENL_ID_CTRL, getpid(),
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CTRL_CMD_GETFAMILY,
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CTRL_ATTR_FAMILY_NAME,
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(void*)name, strlen(name) + 1) < 0) {
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return 0;
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}
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int family_id = 0;
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struct nl_cb* callbacks = nl_cb_get(nl_cb_alloc(NL_CB_VALID));
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nl_cb_set(callbacks, NL_CB_VALID, NL_CB_DEFAULT, &parse_family_id,
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&family_id);
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nl_cb_err(callbacks, NL_CB_DEFAULT, &print_receive_error, NULL);
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if (nl_recvmsgs(netlink_socket, callbacks) < 0) {
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return 0;
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}
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nl_cb_put(callbacks);
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return family_id;
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}
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void parse_aggregate_task_stats(struct nlattr* attr, int attr_size,
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struct TaskStatistics* stats) {
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do {
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switch (attr->nla_type) {
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case TASKSTATS_TYPE_PID:
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stats->pid = nla_get_u32(attr);
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break;
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case TASKSTATS_TYPE_TGID:
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stats->tgid = nla_get_u32(attr);
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break;
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case TASKSTATS_TYPE_STATS:
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nla_memcpy(&stats->stats, attr, sizeof(stats->stats));
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break;
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default:
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break;
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}
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} while ((attr = nla_next(attr, &attr_size)));
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}
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int parse_task_stats(struct nl_msg* msg, void* arg) {
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struct TaskStatistics* stats = (struct TaskStatistics*)arg;
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struct genlmsghdr* gnlh = (struct genlmsghdr*)nlmsg_data(nlmsg_hdr(msg));
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struct nlattr* attr = genlmsg_attrdata(gnlh, 0);
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int remaining = genlmsg_attrlen(gnlh, 0);
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do {
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switch (attr->nla_type) {
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case TASKSTATS_TYPE_AGGR_PID:
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case TASKSTATS_TYPE_AGGR_TGID:
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parse_aggregate_task_stats(nla_data(attr), nla_len(attr),
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stats);
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break;
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default:
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break;
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}
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} while ((attr = nla_next(attr, &remaining)));
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return NL_STOP;
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}
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int query_task_stats(struct nl_sock* netlink_socket, int family_id,
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int command_type, int parameter,
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struct TaskStatistics* stats) {
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memset(stats, 0, sizeof(*stats));
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int result = send_command(netlink_socket, family_id, getpid(),
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TASKSTATS_CMD_GET, command_type, ¶meter,
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sizeof(parameter));
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if (result < 0) {
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return result;
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}
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struct nl_cb* callbacks = nl_cb_get(nl_cb_alloc(NL_CB_VALID));
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nl_cb_set(callbacks, NL_CB_VALID, NL_CB_DEFAULT, &parse_task_stats, stats);
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nl_cb_err(callbacks, NL_CB_DEFAULT, &print_receive_error, &family_id);
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result = nl_recvmsgs(netlink_socket, callbacks);
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if (result < 0) {
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return result;
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}
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nl_cb_put(callbacks);
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return stats->pid || stats->tgid;
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}
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double average_ms(unsigned long long total, unsigned long long count) {
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if (!count) {
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return 0;
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}
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return ((double)total) / count / 1e6;
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}
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unsigned long long average_ns(unsigned long long total,
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unsigned long long count) {
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if (!count) {
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return 0;
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}
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return total / count;
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}
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void print_task_stats(const struct TaskStatistics* stats,
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int human_readable) {
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const struct taskstats* s = &stats->stats;
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printf("Basic task statistics\n");
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printf("---------------------\n");
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printf("%-25s%d\n", "Stats version:", s->version);
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printf("%-25s%d\n", "Exit code:", s->ac_exitcode);
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printf("%-25s0x%x\n", "Flags:", s->ac_flag);
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printf("%-25s%d\n", "Nice value:", s->ac_nice);
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printf("%-25s%s\n", "Command name:", s->ac_comm);
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printf("%-25s%d\n", "Scheduling discipline:", s->ac_sched);
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printf("%-25s%d\n", "UID:", s->ac_uid);
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printf("%-25s%d\n", "GID:", s->ac_gid);
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printf("%-25s%d\n", "PID:", s->ac_pid);
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printf("%-25s%d\n", "PPID:", s->ac_ppid);
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if (human_readable) {
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time_t begin_time = s->ac_btime;
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printf("%-25s%s", "Begin time:", ctime(&begin_time));
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} else {
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printf("%-25s%d sec\n", "Begin time:", s->ac_btime);
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}
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printf("%-25s%llu usec\n", "Elapsed time:", s->ac_etime);
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printf("%-25s%llu usec\n", "User CPU time:", s->ac_utime);
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printf("%-25s%llu\n", "Minor page faults:", s->ac_minflt);
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printf("%-25s%llu\n", "Major page faults:", s->ac_majflt);
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printf("%-25s%llu usec\n", "Scaled user time:", s->ac_utimescaled);
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printf("%-25s%llu usec\n", "Scaled system time:", s->ac_stimescaled);
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printf("\nDelay accounting\n");
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printf("----------------\n");
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printf(" %15s%15s%15s%15s%15s%15s\n",
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"Count",
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human_readable ? "Delay (ms)" : "Delay (ns)",
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"Average delay",
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"Real delay",
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"Scaled real",
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"Virtual delay");
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if (!human_readable) {
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printf("CPU %15llu%15llu%15llu%15llu%15llu%15llu\n",
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s->cpu_count,
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s->cpu_delay_total,
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average_ns(s->cpu_delay_total, s->cpu_count),
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s->cpu_run_real_total,
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s->cpu_scaled_run_real_total,
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s->cpu_run_virtual_total);
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printf("IO %15llu%15llu%15llu\n",
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s->blkio_count,
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s->blkio_delay_total,
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average_ns(s->blkio_delay_total, s->blkio_count));
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printf("Swap %15llu%15llu%15llu\n",
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s->swapin_count,
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s->swapin_delay_total,
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average_ns(s->swapin_delay_total, s->swapin_count));
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printf("Reclaim%15llu%15llu%15llu\n",
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s->freepages_count,
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s->freepages_delay_total,
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average_ns(s->freepages_delay_total, s->freepages_count));
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} else {
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const double ms_per_ns = 1e6;
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printf("CPU %15llu%15.3f%15.3f%15.3f%15.3f%15.3f\n",
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s->cpu_count,
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s->cpu_delay_total / ms_per_ns,
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average_ms(s->cpu_delay_total, s->cpu_count),
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s->cpu_run_real_total / ms_per_ns,
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s->cpu_scaled_run_real_total / ms_per_ns,
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s->cpu_run_virtual_total / ms_per_ns);
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printf("IO %15llu%15.3f%15.3f\n",
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s->blkio_count,
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s->blkio_delay_total / ms_per_ns,
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average_ms(s->blkio_delay_total, s->blkio_count));
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printf("Swap %15llu%15.3f%15.3f\n",
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s->swapin_count,
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s->swapin_delay_total / ms_per_ns,
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average_ms(s->swapin_delay_total, s->swapin_count));
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printf("Reclaim%15llu%15.3f%15.3f\n",
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s->freepages_count,
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s->freepages_delay_total / ms_per_ns,
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average_ms(s->freepages_delay_total, s->freepages_count));
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}
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printf("\nExtended accounting fields\n");
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printf("--------------------------\n");
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if (human_readable && s->ac_stime) {
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printf("%-25s%.3f MB\n", "Average RSS usage:",
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(double)s->coremem / s->ac_stime);
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printf("%-25s%.3f MB\n", "Average VM usage:",
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(double)s->virtmem / s->ac_stime);
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} else {
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printf("%-25s%llu MB\n", "Accumulated RSS usage:", s->coremem);
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printf("%-25s%llu MB\n", "Accumulated VM usage:", s->virtmem);
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}
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printf("%-25s%llu KB\n", "RSS high water mark:", s->hiwater_rss);
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printf("%-25s%llu KB\n", "VM high water mark:", s->hiwater_vm);
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printf("%-25s%llu\n", "IO bytes read:", s->read_char);
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printf("%-25s%llu\n", "IO bytes written:", s->write_char);
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printf("%-25s%llu\n", "IO read syscalls:", s->read_syscalls);
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printf("%-25s%llu\n", "IO write syscalls:", s->write_syscalls);
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printf("\nPer-task/thread statistics\n");
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printf("--------------------------\n");
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printf("%-25s%llu\n", "Voluntary switches:", s->nvcsw);
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printf("%-25s%llu\n", "Involuntary switches:", s->nivcsw);
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}
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void print_usage() {
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printf("Linux task stats reporting tool\n"
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"\n"
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"Usage: taskstats [options]\n"
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"\n"
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"Options:\n"
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" --help This text\n"
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" --pid PID Print stats for the process id PID\n"
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" --tgid TGID Print stats for the thread group id TGID\n"
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" --raw Print raw numbers instead of human readable units\n"
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"\n"
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"Either PID or TGID must be specified. For more documentation about "
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"the reported fields, see\n"
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"https://www.kernel.org/doc/Documentation/accounting/"
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"taskstats-struct.txt\n");
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}
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int main(int argc, char** argv) {
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int command_type = 0;
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int pid = 0;
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int human_readable = 1;
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const struct option long_options[] = {
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{"help", no_argument, 0, 0},
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{"pid", required_argument, 0, 0},
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{"tgid", required_argument, 0, 0},
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{"raw", no_argument, 0, 0},
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{0, 0, 0, 0}
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};
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while (1) {
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int option_index;
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int option_char = getopt_long_only(argc, argv, "", long_options,
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&option_index);
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if (option_char == -1) {
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break;
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}
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switch (option_index) {
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case 0:
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print_usage();
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return EXIT_SUCCESS;
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case 1:
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command_type = TASKSTATS_CMD_ATTR_PID;
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pid = atoi(optarg);
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break;
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case 2:
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command_type = TASKSTATS_CMD_ATTR_TGID;
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pid = atoi(optarg);
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break;
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case 3:
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||
|
|
human_readable = 0;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!pid) {
|
||
|
|
printf("Either PID or TGID must be specified\n");
|
||
|
|
return EXIT_FAILURE;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct nl_sock* netlink_socket = nl_socket_alloc();
|
||
|
|
if (!netlink_socket || genl_connect(netlink_socket) < 0) {
|
||
|
|
perror("Unable to open netlink socket (are you root?)");
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
int family_id = get_family_id(netlink_socket, TASKSTATS_GENL_NAME);
|
||
|
|
if (!family_id) {
|
||
|
|
perror("Unable to determine taskstats family id "
|
||
|
|
"(does your kernel support taskstats?)");
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
struct TaskStatistics stats;
|
||
|
|
if (query_task_stats(netlink_socket, family_id, command_type, pid,
|
||
|
|
&stats) < 0) {
|
||
|
|
perror("Failed to query taskstats");
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
print_task_stats(&stats, human_readable);
|
||
|
|
|
||
|
|
nl_socket_free(netlink_socket);
|
||
|
|
return EXIT_SUCCESS;
|
||
|
|
|
||
|
|
error:
|
||
|
|
if (netlink_socket) {
|
||
|
|
nl_socket_free(netlink_socket);
|
||
|
|
}
|
||
|
|
return EXIT_FAILURE;
|
||
|
|
}
|