96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
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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_INDEX 64
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#define MAX_STARS 38
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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(int fd)
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{
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int key;
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long value;
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long data[MAX_INDEX] = {};
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char starstr[MAX_STARS];
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int i;
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int max_ind = -1;
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long max_value = 0;
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for (key = 0; key < MAX_INDEX; key++) {
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bpf_lookup_elem(fd, &key, &value);
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data[key] = value;
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if (value && key > max_ind)
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max_ind = key;
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if (value > max_value)
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max_value = value;
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}
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printf(" syscall write() stats\n");
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printf(" byte_size : count distribution\n");
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for (i = 1; i <= max_ind + 1; i++) {
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stars(starstr, data[i - 1], max_value, MAX_STARS);
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printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
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(1l << i) >> 1, (1l << i) - 1, data[i - 1],
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MAX_STARS, starstr);
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}
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}
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static void int_exit(int sig)
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{
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print_hist(map_fd[1]);
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exit(0);
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}
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int main(int ac, char **argv)
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{
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char filename[256];
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long key, next_key, value;
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FILE *f;
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int i;
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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signal(SIGINT, int_exit);
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/* start 'ping' in the background to have some kfree_skb events */
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f = popen("ping -c5 localhost", "r");
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(void) f;
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/* start 'dd' in the background to have plenty of 'write' syscalls */
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f = popen("dd if=/dev/zero of=/dev/null count=5000000", "r");
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(void) f;
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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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for (i = 0; i < 5; i++) {
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key = 0;
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while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
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bpf_lookup_elem(map_fd[0], &next_key, &value);
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printf("location 0x%lx count %ld\n", next_key, value);
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key = next_key;
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}
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if (key)
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printf("\n");
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sleep(1);
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}
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print_hist(map_fd[1]);
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return 0;
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}
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