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