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 <sys/resource.h> 12 13 #include <bpf/bpf.h> 14 #include <bpf/libbpf.h> 15 16 struct pair { 17 long long val; 18 __u64 ip; 19 }; 20 21 static __u64 time_get_ns(void) 22 { 23 struct timespec ts; 24 25 clock_gettime(CLOCK_MONOTONIC, &ts); 26 return ts.tv_sec * 1000000000ull + ts.tv_nsec; 27 } 28 29 static void print_old_objects(int fd) 30 { 31 long long val = time_get_ns(); 32 __u64 key, next_key; 33 struct pair v; 34 35 key = write(1, "\e[1;1H\e[2J", 11); /* clear screen */ 36 37 key = -1; 38 while (bpf_map_get_next_key(fd, &key, &next_key) == 0) { 39 bpf_map_lookup_elem(fd, &next_key, &v); 40 key = next_key; 41 if (val - v.val < 1000000000ll) 42 /* object was allocated more then 1 sec ago */ 43 continue; 44 printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n", 45 next_key, (val - v.val) / 1000000000ll, v.ip); 46 } 47 } 48 49 int main(int ac, char **argv) 50 { 51 struct bpf_link *links[2]; 52 struct bpf_program *prog; 53 struct bpf_object *obj; 54 char filename[256]; 55 int map_fd, i, j = 0; 56 57 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 58 obj = bpf_object__open_file(filename, NULL); 59 if (libbpf_get_error(obj)) { 60 fprintf(stderr, "ERROR: opening BPF object file failed\n"); 61 return 0; 62 } 63 64 /* load BPF program */ 65 if (bpf_object__load(obj)) { 66 fprintf(stderr, "ERROR: loading BPF object file failed\n"); 67 goto cleanup; 68 } 69 70 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map"); 71 if (map_fd < 0) { 72 fprintf(stderr, "ERROR: finding a map in obj file failed\n"); 73 goto cleanup; 74 } 75 76 bpf_object__for_each_program(prog, obj) { 77 links[j] = bpf_program__attach(prog); 78 if (libbpf_get_error(links[j])) { 79 fprintf(stderr, "ERROR: bpf_program__attach failed\n"); 80 links[j] = NULL; 81 goto cleanup; 82 } 83 j++; 84 } 85 86 for (i = 0; ; i++) { 87 print_old_objects(map_fd); 88 sleep(1); 89 } 90 91 cleanup: 92 for (j--; j >= 0; j--) 93 bpf_link__destroy(links[j]); 94 95 bpf_object__close(obj); 96 return 0; 97 } 98