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 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 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 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