mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
0aed4724a8
Drop the unused variables *done* and *count*. Link: https://lkml.kernel.org/r/20220609144459.86379-1-zhangkkoo@126.com Signed-off-by: cxbing <chenxuebing@jari.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
566 lines
14 KiB
C
566 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* getdelays.c
|
|
*
|
|
* Utility to get per-pid and per-tgid delay accounting statistics
|
|
* Also illustrates usage of the taskstats interface
|
|
*
|
|
* Copyright (C) Shailabh Nagar, IBM Corp. 2005
|
|
* Copyright (C) Balbir Singh, IBM Corp. 2006
|
|
* Copyright (c) Jay Lan, SGI. 2006
|
|
*
|
|
* Compile with
|
|
* gcc -I/usr/src/linux/include getdelays.c -o getdelays
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <poll.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/wait.h>
|
|
#include <signal.h>
|
|
|
|
#include <linux/genetlink.h>
|
|
#include <linux/taskstats.h>
|
|
#include <linux/cgroupstats.h>
|
|
|
|
/*
|
|
* Generic macros for dealing with netlink sockets. Might be duplicated
|
|
* elsewhere. It is recommended that commercial grade applications use
|
|
* libnl or libnetlink and use the interfaces provided by the library
|
|
*/
|
|
#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
|
|
#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
|
|
#define NLA_DATA(na) ((void *)((char*)(na) + NLA_HDRLEN))
|
|
#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
|
|
|
|
#define err(code, fmt, arg...) \
|
|
do { \
|
|
fprintf(stderr, fmt, ##arg); \
|
|
exit(code); \
|
|
} while (0)
|
|
|
|
int rcvbufsz;
|
|
char name[100];
|
|
int dbg;
|
|
int print_delays;
|
|
int print_io_accounting;
|
|
int print_task_context_switch_counts;
|
|
|
|
#define PRINTF(fmt, arg...) { \
|
|
if (dbg) { \
|
|
printf(fmt, ##arg); \
|
|
} \
|
|
}
|
|
|
|
/* Maximum size of response requested or message sent */
|
|
#define MAX_MSG_SIZE 1024
|
|
/* Maximum number of cpus expected to be specified in a cpumask */
|
|
#define MAX_CPUS 32
|
|
|
|
struct msgtemplate {
|
|
struct nlmsghdr n;
|
|
struct genlmsghdr g;
|
|
char buf[MAX_MSG_SIZE];
|
|
};
|
|
|
|
char cpumask[100+6*MAX_CPUS];
|
|
|
|
static void usage(void)
|
|
{
|
|
fprintf(stderr, "getdelays [-dilv] [-w logfile] [-r bufsize] "
|
|
"[-m cpumask] [-t tgid] [-p pid]\n");
|
|
fprintf(stderr, " -d: print delayacct stats\n");
|
|
fprintf(stderr, " -i: print IO accounting (works only with -p)\n");
|
|
fprintf(stderr, " -l: listen forever\n");
|
|
fprintf(stderr, " -v: debug on\n");
|
|
fprintf(stderr, " -C: container path\n");
|
|
}
|
|
|
|
/*
|
|
* Create a raw netlink socket and bind
|
|
*/
|
|
static int create_nl_socket(int protocol)
|
|
{
|
|
int fd;
|
|
struct sockaddr_nl local;
|
|
|
|
fd = socket(AF_NETLINK, SOCK_RAW, protocol);
|
|
if (fd < 0)
|
|
return -1;
|
|
|
|
if (rcvbufsz)
|
|
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
|
|
&rcvbufsz, sizeof(rcvbufsz)) < 0) {
|
|
fprintf(stderr, "Unable to set socket rcv buf size to %d\n",
|
|
rcvbufsz);
|
|
goto error;
|
|
}
|
|
|
|
memset(&local, 0, sizeof(local));
|
|
local.nl_family = AF_NETLINK;
|
|
|
|
if (bind(fd, (struct sockaddr *) &local, sizeof(local)) < 0)
|
|
goto error;
|
|
|
|
return fd;
|
|
error:
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid,
|
|
__u8 genl_cmd, __u16 nla_type,
|
|
void *nla_data, int nla_len)
|
|
{
|
|
struct nlattr *na;
|
|
struct sockaddr_nl nladdr;
|
|
int r, buflen;
|
|
char *buf;
|
|
|
|
struct msgtemplate msg;
|
|
|
|
msg.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
|
|
msg.n.nlmsg_type = nlmsg_type;
|
|
msg.n.nlmsg_flags = NLM_F_REQUEST;
|
|
msg.n.nlmsg_seq = 0;
|
|
msg.n.nlmsg_pid = nlmsg_pid;
|
|
msg.g.cmd = genl_cmd;
|
|
msg.g.version = 0x1;
|
|
na = (struct nlattr *) GENLMSG_DATA(&msg);
|
|
na->nla_type = nla_type;
|
|
na->nla_len = nla_len + NLA_HDRLEN;
|
|
memcpy(NLA_DATA(na), nla_data, nla_len);
|
|
msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len);
|
|
|
|
buf = (char *) &msg;
|
|
buflen = msg.n.nlmsg_len ;
|
|
memset(&nladdr, 0, sizeof(nladdr));
|
|
nladdr.nl_family = AF_NETLINK;
|
|
while ((r = sendto(sd, buf, buflen, 0, (struct sockaddr *) &nladdr,
|
|
sizeof(nladdr))) < buflen) {
|
|
if (r > 0) {
|
|
buf += r;
|
|
buflen -= r;
|
|
} else if (errno != EAGAIN)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Probe the controller in genetlink to find the family id
|
|
* for the TASKSTATS family
|
|
*/
|
|
static int get_family_id(int sd)
|
|
{
|
|
struct {
|
|
struct nlmsghdr n;
|
|
struct genlmsghdr g;
|
|
char buf[256];
|
|
} ans;
|
|
|
|
int id = 0, rc;
|
|
struct nlattr *na;
|
|
int rep_len;
|
|
|
|
strcpy(name, TASKSTATS_GENL_NAME);
|
|
rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
|
|
CTRL_ATTR_FAMILY_NAME, (void *)name,
|
|
strlen(TASKSTATS_GENL_NAME)+1);
|
|
if (rc < 0)
|
|
return 0; /* sendto() failure? */
|
|
|
|
rep_len = recv(sd, &ans, sizeof(ans), 0);
|
|
if (ans.n.nlmsg_type == NLMSG_ERROR ||
|
|
(rep_len < 0) || !NLMSG_OK((&ans.n), rep_len))
|
|
return 0;
|
|
|
|
na = (struct nlattr *) GENLMSG_DATA(&ans);
|
|
na = (struct nlattr *) ((char *) na + NLA_ALIGN(na->nla_len));
|
|
if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
|
|
id = *(__u16 *) NLA_DATA(na);
|
|
}
|
|
return id;
|
|
}
|
|
|
|
#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
|
|
|
|
static void print_delayacct(struct taskstats *t)
|
|
{
|
|
printf("\n\nCPU %15s%15s%15s%15s%15s\n"
|
|
" %15llu%15llu%15llu%15llu%15.3fms\n"
|
|
"IO %15s%15s%15s\n"
|
|
" %15llu%15llu%15llums\n"
|
|
"SWAP %15s%15s%15s\n"
|
|
" %15llu%15llu%15llums\n"
|
|
"RECLAIM %12s%15s%15s\n"
|
|
" %15llu%15llu%15llums\n"
|
|
"THRASHING%12s%15s%15s\n"
|
|
" %15llu%15llu%15llums\n"
|
|
"COMPACT %12s%15s%15s\n"
|
|
" %15llu%15llu%15llums\n"
|
|
"WPCOPY %12s%15s%15s\n"
|
|
" %15llu%15llu%15llums\n",
|
|
"count", "real total", "virtual total",
|
|
"delay total", "delay average",
|
|
(unsigned long long)t->cpu_count,
|
|
(unsigned long long)t->cpu_run_real_total,
|
|
(unsigned long long)t->cpu_run_virtual_total,
|
|
(unsigned long long)t->cpu_delay_total,
|
|
average_ms((double)t->cpu_delay_total, t->cpu_count),
|
|
"count", "delay total", "delay average",
|
|
(unsigned long long)t->blkio_count,
|
|
(unsigned long long)t->blkio_delay_total,
|
|
average_ms(t->blkio_delay_total, t->blkio_count),
|
|
"count", "delay total", "delay average",
|
|
(unsigned long long)t->swapin_count,
|
|
(unsigned long long)t->swapin_delay_total,
|
|
average_ms(t->swapin_delay_total, t->swapin_count),
|
|
"count", "delay total", "delay average",
|
|
(unsigned long long)t->freepages_count,
|
|
(unsigned long long)t->freepages_delay_total,
|
|
average_ms(t->freepages_delay_total, t->freepages_count),
|
|
"count", "delay total", "delay average",
|
|
(unsigned long long)t->thrashing_count,
|
|
(unsigned long long)t->thrashing_delay_total,
|
|
average_ms(t->thrashing_delay_total, t->thrashing_count),
|
|
"count", "delay total", "delay average",
|
|
(unsigned long long)t->compact_count,
|
|
(unsigned long long)t->compact_delay_total,
|
|
average_ms(t->compact_delay_total, t->compact_count),
|
|
"count", "delay total", "delay average",
|
|
(unsigned long long)t->wpcopy_count,
|
|
(unsigned long long)t->wpcopy_delay_total,
|
|
average_ms(t->wpcopy_delay_total, t->wpcopy_count));
|
|
}
|
|
|
|
static void task_context_switch_counts(struct taskstats *t)
|
|
{
|
|
printf("\n\nTask %15s%15s\n"
|
|
" %15llu%15llu\n",
|
|
"voluntary", "nonvoluntary",
|
|
(unsigned long long)t->nvcsw, (unsigned long long)t->nivcsw);
|
|
}
|
|
|
|
static void print_cgroupstats(struct cgroupstats *c)
|
|
{
|
|
printf("sleeping %llu, blocked %llu, running %llu, stopped %llu, "
|
|
"uninterruptible %llu\n", (unsigned long long)c->nr_sleeping,
|
|
(unsigned long long)c->nr_io_wait,
|
|
(unsigned long long)c->nr_running,
|
|
(unsigned long long)c->nr_stopped,
|
|
(unsigned long long)c->nr_uninterruptible);
|
|
}
|
|
|
|
|
|
static void print_ioacct(struct taskstats *t)
|
|
{
|
|
printf("%s: read=%llu, write=%llu, cancelled_write=%llu\n",
|
|
t->ac_comm,
|
|
(unsigned long long)t->read_bytes,
|
|
(unsigned long long)t->write_bytes,
|
|
(unsigned long long)t->cancelled_write_bytes);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int c, rc, rep_len, aggr_len, len2;
|
|
int cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
|
|
__u16 id;
|
|
__u32 mypid;
|
|
|
|
struct nlattr *na;
|
|
int nl_sd = -1;
|
|
int len = 0;
|
|
pid_t tid = 0;
|
|
pid_t rtid = 0;
|
|
|
|
int fd = 0;
|
|
int write_file = 0;
|
|
int maskset = 0;
|
|
char *logfile = NULL;
|
|
int loop = 0;
|
|
int containerset = 0;
|
|
char *containerpath = NULL;
|
|
int cfd = 0;
|
|
int forking = 0;
|
|
sigset_t sigset;
|
|
|
|
struct msgtemplate msg;
|
|
|
|
while (!forking) {
|
|
c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:");
|
|
if (c < 0)
|
|
break;
|
|
|
|
switch (c) {
|
|
case 'd':
|
|
printf("print delayacct stats ON\n");
|
|
print_delays = 1;
|
|
break;
|
|
case 'i':
|
|
printf("printing IO accounting\n");
|
|
print_io_accounting = 1;
|
|
break;
|
|
case 'q':
|
|
printf("printing task/process context switch rates\n");
|
|
print_task_context_switch_counts = 1;
|
|
break;
|
|
case 'C':
|
|
containerset = 1;
|
|
containerpath = optarg;
|
|
break;
|
|
case 'w':
|
|
logfile = strdup(optarg);
|
|
printf("write to file %s\n", logfile);
|
|
write_file = 1;
|
|
break;
|
|
case 'r':
|
|
rcvbufsz = atoi(optarg);
|
|
printf("receive buf size %d\n", rcvbufsz);
|
|
if (rcvbufsz < 0)
|
|
err(1, "Invalid rcv buf size\n");
|
|
break;
|
|
case 'm':
|
|
strncpy(cpumask, optarg, sizeof(cpumask));
|
|
cpumask[sizeof(cpumask) - 1] = '\0';
|
|
maskset = 1;
|
|
printf("cpumask %s maskset %d\n", cpumask, maskset);
|
|
break;
|
|
case 't':
|
|
tid = atoi(optarg);
|
|
if (!tid)
|
|
err(1, "Invalid tgid\n");
|
|
cmd_type = TASKSTATS_CMD_ATTR_TGID;
|
|
break;
|
|
case 'p':
|
|
tid = atoi(optarg);
|
|
if (!tid)
|
|
err(1, "Invalid pid\n");
|
|
cmd_type = TASKSTATS_CMD_ATTR_PID;
|
|
break;
|
|
case 'c':
|
|
|
|
/* Block SIGCHLD for sigwait() later */
|
|
if (sigemptyset(&sigset) == -1)
|
|
err(1, "Failed to empty sigset");
|
|
if (sigaddset(&sigset, SIGCHLD))
|
|
err(1, "Failed to set sigchld in sigset");
|
|
sigprocmask(SIG_BLOCK, &sigset, NULL);
|
|
|
|
/* fork/exec a child */
|
|
tid = fork();
|
|
if (tid < 0)
|
|
err(1, "Fork failed\n");
|
|
if (tid == 0)
|
|
if (execvp(argv[optind - 1],
|
|
&argv[optind - 1]) < 0)
|
|
exit(-1);
|
|
|
|
/* Set the command type and avoid further processing */
|
|
cmd_type = TASKSTATS_CMD_ATTR_PID;
|
|
forking = 1;
|
|
break;
|
|
case 'v':
|
|
printf("debug on\n");
|
|
dbg = 1;
|
|
break;
|
|
case 'l':
|
|
printf("listen forever\n");
|
|
loop = 1;
|
|
break;
|
|
default:
|
|
usage();
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
if (write_file) {
|
|
fd = open(logfile, O_WRONLY | O_CREAT | O_TRUNC,
|
|
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
|
|
if (fd == -1) {
|
|
perror("Cannot open output file\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
nl_sd = create_nl_socket(NETLINK_GENERIC);
|
|
if (nl_sd < 0)
|
|
err(1, "error creating Netlink socket\n");
|
|
|
|
|
|
mypid = getpid();
|
|
id = get_family_id(nl_sd);
|
|
if (!id) {
|
|
fprintf(stderr, "Error getting family id, errno %d\n", errno);
|
|
goto err;
|
|
}
|
|
PRINTF("family id %d\n", id);
|
|
|
|
if (maskset) {
|
|
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
|
|
TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
|
|
&cpumask, strlen(cpumask) + 1);
|
|
PRINTF("Sent register cpumask, retval %d\n", rc);
|
|
if (rc < 0) {
|
|
fprintf(stderr, "error sending register cpumask\n");
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (tid && containerset) {
|
|
fprintf(stderr, "Select either -t or -C, not both\n");
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* If we forked a child, wait for it to exit. Cannot use waitpid()
|
|
* as all the delicious data would be reaped as part of the wait
|
|
*/
|
|
if (tid && forking) {
|
|
int sig_received;
|
|
sigwait(&sigset, &sig_received);
|
|
}
|
|
|
|
if (tid) {
|
|
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
|
|
cmd_type, &tid, sizeof(__u32));
|
|
PRINTF("Sent pid/tgid, retval %d\n", rc);
|
|
if (rc < 0) {
|
|
fprintf(stderr, "error sending tid/tgid cmd\n");
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (containerset) {
|
|
cfd = open(containerpath, O_RDONLY);
|
|
if (cfd < 0) {
|
|
perror("error opening container file");
|
|
goto err;
|
|
}
|
|
rc = send_cmd(nl_sd, id, mypid, CGROUPSTATS_CMD_GET,
|
|
CGROUPSTATS_CMD_ATTR_FD, &cfd, sizeof(__u32));
|
|
if (rc < 0) {
|
|
perror("error sending cgroupstats command");
|
|
goto err;
|
|
}
|
|
}
|
|
if (!maskset && !tid && !containerset) {
|
|
usage();
|
|
goto err;
|
|
}
|
|
|
|
do {
|
|
rep_len = recv(nl_sd, &msg, sizeof(msg), 0);
|
|
PRINTF("received %d bytes\n", rep_len);
|
|
|
|
if (rep_len < 0) {
|
|
fprintf(stderr, "nonfatal reply error: errno %d\n",
|
|
errno);
|
|
continue;
|
|
}
|
|
if (msg.n.nlmsg_type == NLMSG_ERROR ||
|
|
!NLMSG_OK((&msg.n), rep_len)) {
|
|
struct nlmsgerr *err = NLMSG_DATA(&msg);
|
|
fprintf(stderr, "fatal reply error, errno %d\n",
|
|
err->error);
|
|
goto done;
|
|
}
|
|
|
|
PRINTF("nlmsghdr size=%zu, nlmsg_len=%d, rep_len=%d\n",
|
|
sizeof(struct nlmsghdr), msg.n.nlmsg_len, rep_len);
|
|
|
|
|
|
rep_len = GENLMSG_PAYLOAD(&msg.n);
|
|
|
|
na = (struct nlattr *) GENLMSG_DATA(&msg);
|
|
len = 0;
|
|
while (len < rep_len) {
|
|
len += NLA_ALIGN(na->nla_len);
|
|
switch (na->nla_type) {
|
|
case TASKSTATS_TYPE_AGGR_TGID:
|
|
/* Fall through */
|
|
case TASKSTATS_TYPE_AGGR_PID:
|
|
aggr_len = NLA_PAYLOAD(na->nla_len);
|
|
len2 = 0;
|
|
/* For nested attributes, na follows */
|
|
na = (struct nlattr *) NLA_DATA(na);
|
|
while (len2 < aggr_len) {
|
|
switch (na->nla_type) {
|
|
case TASKSTATS_TYPE_PID:
|
|
rtid = *(int *) NLA_DATA(na);
|
|
if (print_delays)
|
|
printf("PID\t%d\n", rtid);
|
|
break;
|
|
case TASKSTATS_TYPE_TGID:
|
|
rtid = *(int *) NLA_DATA(na);
|
|
if (print_delays)
|
|
printf("TGID\t%d\n", rtid);
|
|
break;
|
|
case TASKSTATS_TYPE_STATS:
|
|
if (print_delays)
|
|
print_delayacct((struct taskstats *) NLA_DATA(na));
|
|
if (print_io_accounting)
|
|
print_ioacct((struct taskstats *) NLA_DATA(na));
|
|
if (print_task_context_switch_counts)
|
|
task_context_switch_counts((struct taskstats *) NLA_DATA(na));
|
|
if (fd) {
|
|
if (write(fd, NLA_DATA(na), na->nla_len) < 0) {
|
|
err(1,"write error\n");
|
|
}
|
|
}
|
|
if (!loop)
|
|
goto done;
|
|
break;
|
|
case TASKSTATS_TYPE_NULL:
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown nested"
|
|
" nla_type %d\n",
|
|
na->nla_type);
|
|
break;
|
|
}
|
|
len2 += NLA_ALIGN(na->nla_len);
|
|
na = (struct nlattr *)((char *)na +
|
|
NLA_ALIGN(na->nla_len));
|
|
}
|
|
break;
|
|
|
|
case CGROUPSTATS_TYPE_CGROUP_STATS:
|
|
print_cgroupstats(NLA_DATA(na));
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown nla_type %d\n",
|
|
na->nla_type);
|
|
case TASKSTATS_TYPE_NULL:
|
|
break;
|
|
}
|
|
na = (struct nlattr *) (GENLMSG_DATA(&msg) + len);
|
|
}
|
|
} while (loop);
|
|
done:
|
|
if (maskset) {
|
|
rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET,
|
|
TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
|
|
&cpumask, strlen(cpumask) + 1);
|
|
printf("Sent deregister mask, retval %d\n", rc);
|
|
if (rc < 0)
|
|
err(rc, "error sending deregister cpumask\n");
|
|
}
|
|
err:
|
|
close(nl_sd);
|
|
if (fd)
|
|
close(fd);
|
|
if (cfd)
|
|
close(cfd);
|
|
return 0;
|
|
}
|