161 lines
3.3 KiB
C
161 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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 <string.h>
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#include <sys/resource.h>
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#include <bpf/bpf.h>
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#include "bpf_load.h"
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#include "bpf_util.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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struct task {
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char comm[16];
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__u64 pid_tgid;
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__u64 uid_gid;
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};
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struct hist_key {
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struct task t;
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__u32 index;
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};
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#define SIZE sizeof(struct task)
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static void print_hist_for_pid(int fd, void *task)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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struct hist_key key = {}, next_key;
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long values[nr_cpus];
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char starstr[MAX_STARS];
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long value;
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long data[MAX_INDEX] = {};
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int max_ind = -1;
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long max_value = 0;
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int i, ind;
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while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
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if (memcmp(&next_key, task, SIZE)) {
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key = next_key;
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continue;
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}
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bpf_map_lookup_elem(fd, &next_key, values);
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value = 0;
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for (i = 0; i < nr_cpus; i++)
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value += values[i];
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ind = next_key.index;
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data[ind] = value;
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if (value && ind > max_ind)
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max_ind = ind;
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if (value > max_value)
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max_value = value;
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key = next_key;
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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 print_hist(int fd)
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{
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struct hist_key key = {}, next_key;
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static struct task tasks[1024];
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int task_cnt = 0;
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int i;
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while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
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int found = 0;
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for (i = 0; i < task_cnt; i++)
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if (memcmp(&tasks[i], &next_key, SIZE) == 0)
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found = 1;
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if (!found)
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memcpy(&tasks[task_cnt++], &next_key, SIZE);
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key = next_key;
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}
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for (i = 0; i < task_cnt; i++) {
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printf("\npid %d cmd %s uid %d\n",
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(__u32) tasks[i].pid_tgid,
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tasks[i].comm,
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(__u32) tasks[i].uid_gid);
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print_hist_for_pid(fd, &tasks[i]);
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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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struct rlimit r = {1024*1024, RLIM_INFINITY};
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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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if (setrlimit(RLIMIT_MEMLOCK, &r)) {
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perror("setrlimit(RLIMIT_MEMLOCK)");
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return 1;
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}
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signal(SIGINT, int_exit);
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signal(SIGTERM, int_exit);
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/* start 'ping' in the background to have some kfree_skb events */
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f = popen("ping -4 -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_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
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bpf_map_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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