1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
3 */
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <signal.h>
7 #include <unistd.h>
8 #include <stdbool.h>
9 #include <string.h>
10 #include <time.h>
11 #include <linux/bpf.h>
12 #include <sys/resource.h>
13
14 #include <bpf/bpf.h>
15 #include "bpf_load.h"
16
17 struct pair {
18 long long val;
19 __u64 ip;
20 };
21
time_get_ns(void)22 static __u64 time_get_ns(void)
23 {
24 struct timespec ts;
25
26 clock_gettime(CLOCK_MONOTONIC, &ts);
27 return ts.tv_sec * 1000000000ull + ts.tv_nsec;
28 }
29
print_old_objects(int fd)30 static void print_old_objects(int fd)
31 {
32 long long val = time_get_ns();
33 __u64 key, next_key;
34 struct pair v;
35
36 key = write(1, "\e[1;1H\e[2J", 12); /* clear screen */
37
38 key = -1;
39 while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
40 bpf_map_lookup_elem(map_fd[0], &next_key, &v);
41 key = next_key;
42 if (val - v.val < 1000000000ll)
43 /* object was allocated more then 1 sec ago */
44 continue;
45 printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n",
46 next_key, (val - v.val) / 1000000000ll, v.ip);
47 }
48 }
49
main(int ac,char ** argv)50 int main(int ac, char **argv)
51 {
52 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
53 char filename[256];
54 int i;
55
56 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
57
58 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
59 perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)");
60 return 1;
61 }
62
63 if (load_bpf_file(filename)) {
64 printf("%s", bpf_log_buf);
65 return 1;
66 }
67
68 for (i = 0; ; i++) {
69 print_old_objects(map_fd[1]);
70 sleep(1);
71 }
72
73 return 0;
74 }
75