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canbusload: support busload statistic 

Add '-s' option for display busload statistic, the output contains
minimal, maximum and exponentially-damped moving sums of one second
average (borrowed from Linux load average algorithm) since start or
reset (press 'r' while running).

canbusload 2024-09-23 17:15:18 (exact bitstuffing)
 can0@500k   942  107535   60168       0  18% min:  0%, max: 21%, load: 16%   6%   2% |XXX.................|

Signed-off-by: Zhu Yi <yi.zhu5@cn.bosch.com>
Signed-off-by: Hubert Streidl <hubert.streidl@de.bosch.com>
Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com>
Link: https://lore.kernel.org/r/20250120162332.19157-2-mark.jonas@de.bosch.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
pull/571/head
Zhu Yi 2025-01-20 17:23:31 +01:00 committed by Marc Kleine-Budde
parent 6eb97b57c5
commit b85418d75c
1 changed files with 91 additions and 1 deletions
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92
canbusload.c
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@ -45,14 +45,17 @@
#include <ctype.h>
#include <libgen.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
@ -72,6 +75,24 @@
#define NUMBAR (100 / PERCENTRES) /* number of bargraph elements */
#define BRSTRLEN 20
/*
* Inspired from
* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/
* include/linux/sched/loadavg.h
*
* Following are the fixed-point math constants and the exponential-damping
* factors for:
* - 1 samples/s in 1 minute
* - 1 samples/s in 5 minutes
* - 1 samples/s in 15 minutes
* in fixed-point representation.
*/
#define FP_SHIFT 12 /* bits of precision */
#define FP_ONE (1 << FP_SHIFT) /* 1.0 fixed-point representation */
#define EXP_1 4028 /* (1 / e ^ (1 / 60)) * FP_ONE */
#define EXP_5 4082 /* (1 / e ^ (1 / 300)) * FP_ONE */
#define EXP_15 4091 /* (1 / e ^ (1 / 900)) * FP_ONE */
extern int optind, opterr, optopt;
static struct {
@ -85,6 +106,11 @@ static struct {
unsigned int recv_bits_total;
unsigned int recv_bits_payload;
unsigned int recv_bits_dbitrate;
unsigned int load_min;
unsigned int load_max;
unsigned int load_1m;
unsigned int load_5m;
unsigned int load_15m;
} stat[MAXDEVS + 1];
static volatile int running = 1;
@ -96,8 +122,11 @@ static unsigned char redraw;
static unsigned char timestamp;
static unsigned char color;
static unsigned char bargraph;
static bool statistic;
static bool reset;
static enum cfl_mode mode = CFL_WORSTCASE;
static char *prg;
static struct termios old;
static void print_usage(char *prg)
{
@ -111,6 +140,7 @@ static void print_usage(char *prg)
fprintf(stderr, " -r (redraw the terminal - similar to top)\n");
fprintf(stderr, " -i (ignore bitstuffing in bandwidth calculation)\n");
fprintf(stderr, " -e (exact calculation of stuffed bits)\n");
fprintf(stderr, " -s (show statistics, press 'r' to reset)\n");
fprintf(stderr, "\n");
fprintf(stderr, "Up to %d CAN interfaces with mandatory bitrate can be specified on the \n", MAXDEVS);
fprintf(stderr, "commandline in the form: <ifname>@<bitrate>[,<dbitrate>]\n");
@ -161,6 +191,16 @@ static void create_bitrate_string(int stat_idx, int *max_bitratestr_len)
*max_bitratestr_len = ptr;
}
static unsigned int calc_load(unsigned int load_fp,
unsigned int exp_fp,
unsigned int sample)
{
unsigned int sample_fp = sample << FP_SHIFT;
unsigned int damped_sum = (load_fp * exp_fp) +
(sample_fp * (FP_ONE - exp_fp));
return damped_sum >> FP_SHIFT;
}
static void printstats(int signo)
{
int i, j, percent;
@ -234,6 +274,30 @@ static void printstats(int signo)
stat[i].recv_bits_dbitrate,
percent);
if (statistic) {
if (reset) {
stat[i].load_min = UINT_MAX;
stat[i].load_max = 0;
stat[i].load_1m = 0;
stat[i].load_5m = 0;
stat[i].load_15m = 0;
}
stat[i].load_min = MIN(stat[i].load_min, percent);
stat[i].load_max = MAX(stat[i].load_max, percent);
stat[i].load_1m = calc_load(stat[i].load_1m, EXP_1, percent);
stat[i].load_5m = calc_load(stat[i].load_5m, EXP_5, percent);
stat[i].load_15m = calc_load(stat[i].load_15m, EXP_15, percent);
printf(" min:%3d%%, max:%3d%%, load:%3d%% %3d%% %3d%%",
stat[i].load_min,
stat[i].load_max,
(stat[i].load_1m + (FP_ONE >> 1)) >> FP_SHIFT,
(stat[i].load_5m + (FP_ONE >> 1)) >> FP_SHIFT,
(stat[i].load_15m + (FP_ONE >> 1)) >> FP_SHIFT);
}
if (bargraph) {
printf(" |");
@ -264,6 +328,8 @@ static void printstats(int signo)
stat[i].recv_direction = '.';
}
reset = false;
if (!redraw)
printf("\n");
@ -272,6 +338,11 @@ static void printstats(int signo)
alarm(1);
}
void cleanup()
{
tcsetattr(STDIN_FILENO, TCSANOW, &old);
}
int main(int argc, char **argv)
{
fd_set rdfs;
@ -288,6 +359,13 @@ int main(int argc, char **argv)
unsigned int anydev_bitrate = 0;
unsigned int anydev_dbitrate = 0;
char anydev_bitratestr[BRSTRLEN]; /* 100000/2000000 => 100k/2M */
struct termios temp;
tcgetattr(STDIN_FILENO, &old);
atexit(cleanup);
temp = old;
temp.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &temp);
signal(SIGTERM, sigterm);
signal(SIGHUP, sigterm);
@ -297,7 +375,7 @@ int main(int argc, char **argv)
prg = basename(argv[0]);
while ((opt = getopt(argc, argv, "rtbcieh?")) != -1) {
while ((opt = getopt(argc, argv, "rtbciesh?")) != -1) {
switch (opt) {
case 'r':
redraw = 1;
@ -323,6 +401,11 @@ int main(int argc, char **argv)
mode = CFL_EXACT;
break;
case 's':
statistic = true;
reset = true;
break;
default:
print_usage(prg);
exit(1);
@ -449,12 +532,19 @@ int main(int argc, char **argv)
while (running) {
FD_ZERO(&rdfs);
FD_SET(s, &rdfs);
FD_SET(STDIN_FILENO, &rdfs);
if (select(s + 1, &rdfs, NULL, NULL, NULL) < 0) {
//perror("pselect");
continue;
}
if (FD_ISSET(STDIN_FILENO, &rdfs)) {
if (getchar() == 'r') {
reset = true;
}
}
/* these settings may be modified by recvmsg() */
iov.iov_len = sizeof(frame);
msg.msg_namelen = sizeof(addr);