mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 107 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.615055994@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
100 lines
1.8 KiB
C
100 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
|
|
* Copyright (c) 2015 BMW Car IT GmbH
|
|
*/
|
|
#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;
|
|
}
|