/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
|
* Copyright (c) 2015 BMW Car IT GmbH
|
*
|
* This program is free software; you can redistribute it and/or
|
* modify it under the terms of version 2 of the GNU General Public
|
* License as published by the Free Software Foundation.
|
*/
|
#include <stdio.h>
|
#include <unistd.h>
|
#include <stdlib.h>
|
#include <signal.h>
|
#include <linux/bpf.h>
|
#include <bpf/bpf.h>
|
#include "bpf_load.h"
|
|
#define MAX_ENTRIES 20
|
#define MAX_CPU 4
|
#define MAX_STARS 40
|
|
struct cpu_hist {
|
long data[MAX_ENTRIES];
|
long max;
|
};
|
|
static struct cpu_hist cpu_hist[MAX_CPU];
|
|
static void stars(char *str, long val, long max, int width)
|
{
|
int i;
|
|
for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++)
|
str[i] = '*';
|
if (val > max)
|
str[i - 1] = '+';
|
str[i] = '\0';
|
}
|
|
static void print_hist(void)
|
{
|
char starstr[MAX_STARS];
|
struct cpu_hist *hist;
|
int i, j;
|
|
/* clear screen */
|
printf("\033[2J");
|
|
for (j = 0; j < MAX_CPU; j++) {
|
hist = &cpu_hist[j];
|
|
/* ignore CPUs without data (maybe offline?) */
|
if (hist->max == 0)
|
continue;
|
|
printf("CPU %d\n", j);
|
printf(" latency : count distribution\n");
|
for (i = 1; i <= MAX_ENTRIES; i++) {
|
stars(starstr, hist->data[i - 1], hist->max, MAX_STARS);
|
printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
|
(1l << i) >> 1, (1l << i) - 1,
|
hist->data[i - 1], MAX_STARS, starstr);
|
}
|
}
|
}
|
|
static void get_data(int fd)
|
{
|
long key, value;
|
int c, i;
|
|
for (i = 0; i < MAX_CPU; i++)
|
cpu_hist[i].max = 0;
|
|
for (c = 0; c < MAX_CPU; c++) {
|
for (i = 0; i < MAX_ENTRIES; i++) {
|
key = c * MAX_ENTRIES + i;
|
bpf_map_lookup_elem(fd, &key, &value);
|
|
cpu_hist[c].data[i] = value;
|
if (value > cpu_hist[c].max)
|
cpu_hist[c].max = value;
|
}
|
}
|
}
|
|
int main(int argc, char **argv)
|
{
|
char filename[256];
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
if (load_bpf_file(filename)) {
|
printf("%s", bpf_log_buf);
|
return 1;
|
}
|
|
while (1) {
|
get_data(map_fd[1]);
|
print_hist();
|
sleep(5);
|
}
|
|
return 0;
|
}
|
