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PL286/system/extras/taskstats/taskstats.c

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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Linux task stats reporting tool. Queries and prints out the kernel's
* taskstats structure for a given process or thread group id. See
* https://www.kernel.org/doc/Documentation/accounting/ for more information
* about the reported fields.
*/
#include <errno.h>
#include <getopt.h>
#include <netlink/attr.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
#include <netlink/handlers.h>
#include <netlink/msg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/cdefs.h>
#include <time.h>
#include <unistd.h>
#include <linux/taskstats.h>
struct TaskStatistics {
int pid;
int tgid;
struct taskstats stats;
};
int print_receive_error(struct sockaddr_nl* address __unused,
struct nlmsgerr* error, void* arg __unused) {
fprintf(stderr, "Netlink receive error: %s\n", strerror(-error->error));
return NL_STOP;
}
void parse_aggregate_task_stats(struct nlattr* attr, int attr_size,
struct TaskStatistics* stats) {
nla_for_each_attr(attr, attr, attr_size, attr_size) {
switch (attr->nla_type) {
case TASKSTATS_TYPE_PID:
stats->pid = nla_get_u32(attr);
break;
case TASKSTATS_TYPE_TGID:
stats->tgid = nla_get_u32(attr);
break;
case TASKSTATS_TYPE_STATS:
nla_memcpy(&stats->stats, attr, sizeof(stats->stats));
break;
default:
break;
}
}
}
int parse_task_stats(struct nl_msg* msg, void* arg) {
struct TaskStatistics* stats = (struct TaskStatistics*)arg;
struct genlmsghdr* gnlh = (struct genlmsghdr*)nlmsg_data(nlmsg_hdr(msg));
struct nlattr* attr = genlmsg_attrdata(gnlh, 0);
int remaining = genlmsg_attrlen(gnlh, 0);
nla_for_each_attr(attr, attr, remaining, remaining) {
switch (attr->nla_type) {
case TASKSTATS_TYPE_AGGR_PID:
case TASKSTATS_TYPE_AGGR_TGID:
parse_aggregate_task_stats(nla_data(attr), nla_len(attr),
stats);
break;
default:
break;
}
}
return NL_STOP;
}
int query_task_stats(struct nl_sock* netlink_socket, int family_id,
int command_type, int parameter,
struct TaskStatistics* stats) {
memset(stats, 0, sizeof(*stats));
struct nl_msg* message = nlmsg_alloc();
genlmsg_put(message, NL_AUTO_PID, NL_AUTO_SEQ, family_id, 0, 0,
TASKSTATS_CMD_GET, TASKSTATS_VERSION);
nla_put_u32(message, command_type, parameter);
int result = nl_send_auto_complete(netlink_socket, message);
nlmsg_free(message);
if (result < 0) {
return result;
}
struct nl_cb* callbacks = nl_cb_get(nl_cb_alloc(NL_CB_CUSTOM));
nl_cb_set(callbacks, NL_CB_VALID, NL_CB_CUSTOM, &parse_task_stats, stats);
nl_cb_err(callbacks, NL_CB_CUSTOM, &print_receive_error, &family_id);
result = nl_recvmsgs(netlink_socket, callbacks);
nl_cb_put(callbacks);
if (result < 0) {
return result;
}
return stats->pid || stats->tgid;
}
double average_ms(unsigned long long total, unsigned long long count) {
if (!count) {
return 0;
}
return ((double)total) / count / 1e6;
}
unsigned long long average_ns(unsigned long long total,
unsigned long long count) {
if (!count) {
return 0;
}
return total / count;
}
void print_task_stats(const struct TaskStatistics* stats,
int human_readable) {
const struct taskstats* s = &stats->stats;
printf("Basic task statistics\n");
printf("---------------------\n");
printf("%-25s%d\n", "Stats version:", s->version);
printf("%-25s%d\n", "Exit code:", s->ac_exitcode);
printf("%-25s0x%x\n", "Flags:", s->ac_flag);
printf("%-25s%d\n", "Nice value:", s->ac_nice);
printf("%-25s%s\n", "Command name:", s->ac_comm);
printf("%-25s%d\n", "Scheduling discipline:", s->ac_sched);
printf("%-25s%d\n", "UID:", s->ac_uid);
printf("%-25s%d\n", "GID:", s->ac_gid);
printf("%-25s%d\n", "PID:", s->ac_pid);
printf("%-25s%d\n", "PPID:", s->ac_ppid);
if (human_readable) {
time_t begin_time = s->ac_btime;
printf("%-25s%s", "Begin time:", ctime(&begin_time));
} else {
printf("%-25s%d sec\n", "Begin time:", s->ac_btime);
}
printf("%-25s%llu usec\n", "Elapsed time:", s->ac_etime);
printf("%-25s%llu usec\n", "User CPU time:", s->ac_utime);
printf("%-25s%llu\n", "Minor page faults:", s->ac_minflt);
printf("%-25s%llu\n", "Major page faults:", s->ac_majflt);
printf("%-25s%llu usec\n", "Scaled user time:", s->ac_utimescaled);
printf("%-25s%llu usec\n", "Scaled system time:", s->ac_stimescaled);
printf("\nDelay accounting\n");
printf("----------------\n");
printf(" %15s%15s%15s%15s%15s%15s\n",
"Count",
human_readable ? "Delay (ms)" : "Delay (ns)",
"Average delay",
"Real delay",
"Scaled real",
"Virtual delay");
if (!human_readable) {
printf("CPU %15llu%15llu%15llu%15llu%15llu%15llu\n",
s->cpu_count,
s->cpu_delay_total,
average_ns(s->cpu_delay_total, s->cpu_count),
s->cpu_run_real_total,
s->cpu_scaled_run_real_total,
s->cpu_run_virtual_total);
printf("IO %15llu%15llu%15llu\n",
s->blkio_count,
s->blkio_delay_total,
average_ns(s->blkio_delay_total, s->blkio_count));
printf("Swap %15llu%15llu%15llu\n",
s->swapin_count,
s->swapin_delay_total,
average_ns(s->swapin_delay_total, s->swapin_count));
printf("Reclaim%15llu%15llu%15llu\n",
s->freepages_count,
s->freepages_delay_total,
average_ns(s->freepages_delay_total, s->freepages_count));
} else {
const double ms_per_ns = 1e6;
printf("CPU %15llu%15.3f%15.3f%15.3f%15.3f%15.3f\n",
s->cpu_count,
s->cpu_delay_total / ms_per_ns,
average_ms(s->cpu_delay_total, s->cpu_count),
s->cpu_run_real_total / ms_per_ns,
s->cpu_scaled_run_real_total / ms_per_ns,
s->cpu_run_virtual_total / ms_per_ns);
printf("IO %15llu%15.3f%15.3f\n",
s->blkio_count,
s->blkio_delay_total / ms_per_ns,
average_ms(s->blkio_delay_total, s->blkio_count));
printf("Swap %15llu%15.3f%15.3f\n",
s->swapin_count,
s->swapin_delay_total / ms_per_ns,
average_ms(s->swapin_delay_total, s->swapin_count));
printf("Reclaim%15llu%15.3f%15.3f\n",
s->freepages_count,
s->freepages_delay_total / ms_per_ns,
average_ms(s->freepages_delay_total, s->freepages_count));
}
printf("\nExtended accounting fields\n");
printf("--------------------------\n");
if (human_readable && s->ac_stime) {
printf("%-25s%.3f MB\n", "Average RSS usage:",
(double)s->coremem / s->ac_stime);
printf("%-25s%.3f MB\n", "Average VM usage:",
(double)s->virtmem / s->ac_stime);
} else {
printf("%-25s%llu MB\n", "Accumulated RSS usage:", s->coremem);
printf("%-25s%llu MB\n", "Accumulated VM usage:", s->virtmem);
}
printf("%-25s%llu KB\n", "RSS high water mark:", s->hiwater_rss);
printf("%-25s%llu KB\n", "VM high water mark:", s->hiwater_vm);
printf("%-25s%llu\n", "IO bytes read:", s->read_char);
printf("%-25s%llu\n", "IO bytes written:", s->write_char);
printf("%-25s%llu\n", "IO read syscalls:", s->read_syscalls);
printf("%-25s%llu\n", "IO write syscalls:", s->write_syscalls);
printf("\nPer-task/thread statistics\n");
printf("--------------------------\n");
printf("%-25s%llu\n", "Voluntary switches:", s->nvcsw);
printf("%-25s%llu\n", "Involuntary switches:", s->nivcsw);
}
void print_usage() {
printf("Linux task stats reporting tool\n"
"\n"
"Usage: taskstats [options]\n"
"\n"
"Options:\n"
" --help This text\n"
" --pid PID Print stats for the process id PID\n"
" --tgid TGID Print stats for the thread group id TGID\n"
" --raw Print raw numbers instead of human readable units\n"
"\n"
"Either PID or TGID must be specified. For more documentation about "
"the reported fields, see\n"
"https://www.kernel.org/doc/Documentation/accounting/"
"taskstats-struct.txt\n");
}
int main(int argc, char** argv) {
int command_type = 0;
int pid = 0;
int human_readable = 1;
const struct option long_options[] = {
{"help", no_argument, 0, 0},
{"pid", required_argument, 0, 0},
{"tgid", required_argument, 0, 0},
{"raw", no_argument, 0, 0},
{0, 0, 0, 0}
};
while (1) {
int option_index;
int option_char = getopt_long_only(argc, argv, "", long_options,
&option_index);
if (option_char == -1) {
break;
}
switch (option_index) {
case 0:
print_usage();
return EXIT_SUCCESS;
case 1:
command_type = TASKSTATS_CMD_ATTR_PID;
pid = atoi(optarg);
break;
case 2:
command_type = TASKSTATS_CMD_ATTR_TGID;
pid = atoi(optarg);
break;
case 3:
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) {
fprintf(stderr, "Unable to allocate netlink socket\n");
goto error;
}
int ret = genl_connect(netlink_socket);
if (ret < 0) {
nl_perror(ret, "Unable to open netlink socket (are you root?)");
goto error;
}
int family_id = genl_ctrl_resolve(netlink_socket, TASKSTATS_GENL_NAME);
if (family_id < 0) {
nl_perror(family_id, "Unable to determine taskstats family id "
"(does your kernel support taskstats?)");
goto error;
}
struct TaskStatistics stats;
ret = query_task_stats(netlink_socket, family_id, command_type, pid, &stats);
if (ret < 0) {
nl_perror(ret, "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;
}