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 12 #include <bpf/bpf.h> 13 #include <bpf/libbpf.h> 14 15 struct pair { 16 long long val; 17 __u64 ip; 18 }; 19 20 static __u64 time_get_ns(void) 21 { 22 struct timespec ts; 23 24 clock_gettime(CLOCK_MONOTONIC, &ts); 25 return ts.tv_sec * 1000000000ull + ts.tv_nsec; 26 } 27 28 static void print_old_objects(int fd) 29 { 30 long long val = time_get_ns(); 31 __u64 key, next_key; 32 struct pair v; 33 34 key = write(1, "\e[1;1H\e[2J", 11); /* clear screen */ 35 36 key = -1; 37 while (bpf_map_get_next_key(fd, &key, &next_key) == 0) { 38 bpf_map_lookup_elem(fd, &next_key, &v); 39 key = next_key; 40 if (val - v.val < 1000000000ll) 41 /* object was allocated more then 1 sec ago */ 42 continue; 43 printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n", 44 next_key, (val - v.val) / 1000000000ll, v.ip); 45 } 46 } 47 48 int main(int ac, char **argv) 49 { 50 struct bpf_link *links[2]; 51 struct bpf_program *prog; 52 struct bpf_object *obj; 53 char filename[256]; 54 int map_fd, i, j = 0; 55 56 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 57 obj = bpf_object__open_file(filename, NULL); 58 if (libbpf_get_error(obj)) { 59 fprintf(stderr, "ERROR: opening BPF object file failed\n"); 60 return 0; 61 } 62 63 /* load BPF program */ 64 if (bpf_object__load(obj)) { 65 fprintf(stderr, "ERROR: loading BPF object file failed\n"); 66 goto cleanup; 67 } 68 69 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map"); 70 if (map_fd < 0) { 71 fprintf(stderr, "ERROR: finding a map in obj file failed\n"); 72 goto cleanup; 73 } 74 75 bpf_object__for_each_program(prog, obj) { 76 links[j] = bpf_program__attach(prog); 77 if (libbpf_get_error(links[j])) { 78 fprintf(stderr, "ERROR: bpf_program__attach failed\n"); 79 links[j] = NULL; 80 goto cleanup; 81 } 82 j++; 83 } 84 85 for (i = 0; ; i++) { 86 print_old_objects(map_fd); 87 sleep(1); 88 } 89 90 cleanup: 91 for (j--; j >= 0; j--) 92 bpf_link__destroy(links[j]); 93 94 bpf_object__close(obj); 95 return 0; 96 } 97