mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Yafang Shao](/assets/img/avatar_default.png)
We have switched to memcg-based memory accouting and thus the rlimit is not needed any more. LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK was introduced in libbpf for backward compatibility, so we can use it instead now. This patch also removes the useless header sys/resource.h from many files in samples/bpf. Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220409125958.92629-2-laoar.shao@gmail.com
186 lines
4 KiB
C
186 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
|
|
#include <bpf/bpf.h>
|
|
#include <bpf/libbpf.h>
|
|
#include "bpf_util.h"
|
|
|
|
#define MAX_INDEX 64
|
|
#define MAX_STARS 38
|
|
|
|
/* my_map, my_hist_map */
|
|
static int map_fd[2];
|
|
|
|
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';
|
|
}
|
|
|
|
struct task {
|
|
char comm[16];
|
|
__u64 pid_tgid;
|
|
__u64 uid_gid;
|
|
};
|
|
|
|
struct hist_key {
|
|
struct task t;
|
|
__u32 index;
|
|
};
|
|
|
|
#define SIZE sizeof(struct task)
|
|
|
|
static void print_hist_for_pid(int fd, void *task)
|
|
{
|
|
unsigned int nr_cpus = bpf_num_possible_cpus();
|
|
struct hist_key key = {}, next_key;
|
|
long values[nr_cpus];
|
|
char starstr[MAX_STARS];
|
|
long value;
|
|
long data[MAX_INDEX] = {};
|
|
int max_ind = -1;
|
|
long max_value = 0;
|
|
int i, ind;
|
|
|
|
while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
|
|
if (memcmp(&next_key, task, SIZE)) {
|
|
key = next_key;
|
|
continue;
|
|
}
|
|
bpf_map_lookup_elem(fd, &next_key, values);
|
|
value = 0;
|
|
for (i = 0; i < nr_cpus; i++)
|
|
value += values[i];
|
|
ind = next_key.index;
|
|
data[ind] = value;
|
|
if (value && ind > max_ind)
|
|
max_ind = ind;
|
|
if (value > max_value)
|
|
max_value = value;
|
|
key = next_key;
|
|
}
|
|
|
|
printf(" syscall write() stats\n");
|
|
printf(" byte_size : count distribution\n");
|
|
for (i = 1; i <= max_ind + 1; i++) {
|
|
stars(starstr, data[i - 1], max_value, MAX_STARS);
|
|
printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
|
|
(1l << i) >> 1, (1l << i) - 1, data[i - 1],
|
|
MAX_STARS, starstr);
|
|
}
|
|
}
|
|
|
|
static void print_hist(int fd)
|
|
{
|
|
struct hist_key key = {}, next_key;
|
|
static struct task tasks[1024];
|
|
int task_cnt = 0;
|
|
int i;
|
|
|
|
while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
|
|
int found = 0;
|
|
|
|
for (i = 0; i < task_cnt; i++)
|
|
if (memcmp(&tasks[i], &next_key, SIZE) == 0)
|
|
found = 1;
|
|
if (!found)
|
|
memcpy(&tasks[task_cnt++], &next_key, SIZE);
|
|
key = next_key;
|
|
}
|
|
|
|
for (i = 0; i < task_cnt; i++) {
|
|
printf("\npid %d cmd %s uid %d\n",
|
|
(__u32) tasks[i].pid_tgid,
|
|
tasks[i].comm,
|
|
(__u32) tasks[i].uid_gid);
|
|
print_hist_for_pid(fd, &tasks[i]);
|
|
}
|
|
|
|
}
|
|
|
|
static void int_exit(int sig)
|
|
{
|
|
print_hist(map_fd[1]);
|
|
exit(0);
|
|
}
|
|
|
|
int main(int ac, char **argv)
|
|
{
|
|
long key, next_key, value;
|
|
struct bpf_link *links[2];
|
|
struct bpf_program *prog;
|
|
struct bpf_object *obj;
|
|
char filename[256];
|
|
int i, j = 0;
|
|
FILE *f;
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
obj = bpf_object__open_file(filename, NULL);
|
|
if (libbpf_get_error(obj)) {
|
|
fprintf(stderr, "ERROR: opening BPF object file failed\n");
|
|
return 0;
|
|
}
|
|
|
|
/* load BPF program */
|
|
if (bpf_object__load(obj)) {
|
|
fprintf(stderr, "ERROR: loading BPF object file failed\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
map_fd[0] = bpf_object__find_map_fd_by_name(obj, "my_map");
|
|
map_fd[1] = bpf_object__find_map_fd_by_name(obj, "my_hist_map");
|
|
if (map_fd[0] < 0 || map_fd[1] < 0) {
|
|
fprintf(stderr, "ERROR: finding a map in obj file failed\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
signal(SIGINT, int_exit);
|
|
signal(SIGTERM, int_exit);
|
|
|
|
/* start 'ping' in the background to have some kfree_skb events */
|
|
f = popen("ping -4 -c5 localhost", "r");
|
|
(void) f;
|
|
|
|
/* start 'dd' in the background to have plenty of 'write' syscalls */
|
|
f = popen("dd if=/dev/zero of=/dev/null count=5000000", "r");
|
|
(void) f;
|
|
|
|
bpf_object__for_each_program(prog, obj) {
|
|
links[j] = bpf_program__attach(prog);
|
|
if (libbpf_get_error(links[j])) {
|
|
fprintf(stderr, "ERROR: bpf_program__attach failed\n");
|
|
links[j] = NULL;
|
|
goto cleanup;
|
|
}
|
|
j++;
|
|
}
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
key = 0;
|
|
while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
|
|
bpf_map_lookup_elem(map_fd[0], &next_key, &value);
|
|
printf("location 0x%lx count %ld\n", next_key, value);
|
|
key = next_key;
|
|
}
|
|
if (key)
|
|
printf("\n");
|
|
sleep(1);
|
|
}
|
|
print_hist(map_fd[1]);
|
|
|
|
cleanup:
|
|
for (j--; j >= 0; j--)
|
|
bpf_link__destroy(links[j]);
|
|
|
|
bpf_object__close(obj);
|
|
return 0;
|
|
}
|