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 <sys/resource.h> 16 17 #include <bpf/bpf.h> 18 #include "bpf_load.h" 19 20 struct pair { 21 long long val; 22 __u64 ip; 23 }; 24 25 static __u64 time_get_ns(void) 26 { 27 struct timespec ts; 28 29 clock_gettime(CLOCK_MONOTONIC, &ts); 30 return ts.tv_sec * 1000000000ull + ts.tv_nsec; 31 } 32 33 static void print_old_objects(int fd) 34 { 35 long long val = time_get_ns(); 36 __u64 key, next_key; 37 struct pair v; 38 39 key = write(1, "\e[1;1H\e[2J", 12); /* clear screen */ 40 41 key = -1; 42 while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) { 43 bpf_map_lookup_elem(map_fd[0], &next_key, &v); 44 key = next_key; 45 if (val - v.val < 1000000000ll) 46 /* object was allocated more then 1 sec ago */ 47 continue; 48 printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n", 49 next_key, (val - v.val) / 1000000000ll, v.ip); 50 } 51 } 52 53 int main(int ac, char **argv) 54 { 55 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 56 char filename[256]; 57 int i; 58 59 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 60 61 if (setrlimit(RLIMIT_MEMLOCK, &r)) { 62 perror("setrlimit(RLIMIT_MEMLOCK, RLIM_INFINITY)"); 63 return 1; 64 } 65 66 if (load_bpf_file(filename)) { 67 printf("%s", bpf_log_buf); 68 return 1; 69 } 70 71 for (i = 0; ; i++) { 72 print_old_objects(map_fd[1]); 73 sleep(1); 74 } 75 76 return 0; 77 } 78