1 /* Copyright (c) 2015 PLUMgrid, http://plumgrid.com 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of version 2 of the GNU General Public 5 * License as published by the Free Software Foundation. 6 */ 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <signal.h> 10 #include <unistd.h> 11 #include <stdbool.h> 12 #include <string.h> 13 #include <time.h> 14 #include <linux/bpf.h> 15 #include "libbpf.h" 16 #include "bpf_load.h" 17 18 struct pair { 19 long long val; 20 __u64 ip; 21 }; 22 23 static __u64 time_get_ns(void) 24 { 25 struct timespec ts; 26 27 clock_gettime(CLOCK_MONOTONIC, &ts); 28 return ts.tv_sec * 1000000000ull + ts.tv_nsec; 29 } 30 31 static void print_old_objects(int fd) 32 { 33 long long val = time_get_ns(); 34 __u64 key, next_key; 35 struct pair v; 36 37 key = write(1, "\e[1;1H\e[2J", 12); /* clear screen */ 38 39 key = -1; 40 while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) { 41 bpf_lookup_elem(map_fd[0], &next_key, &v); 42 key = next_key; 43 if (val - v.val < 1000000000ll) 44 /* object was allocated more then 1 sec ago */ 45 continue; 46 printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n", 47 next_key, (val - v.val) / 1000000000ll, v.ip); 48 } 49 } 50 51 int main(int ac, char **argv) 52 { 53 char filename[256]; 54 int i; 55 56 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 57 58 if (load_bpf_file(filename)) { 59 printf("%s", bpf_log_buf); 60 return 1; 61 } 62 63 for (i = 0; ; i++) { 64 print_old_objects(map_fd[1]); 65 sleep(1); 66 } 67 68 return 0; 69 } 70