1 /******************************************************************************/ 2 /* */ 3 /* Copyright (c) 2009 FUJITSU LIMITED */ 4 /* */ 5 /* This program is free software; you can redistribute it and/or modify */ 6 /* it under the terms of the GNU General Public License as published by */ 7 /* the Free Software Foundation; either version 2 of the License, or */ 8 /* (at your option) any later version. */ 9 /* */ 10 /* This program is distributed in the hope that it will be useful, */ 11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */ 13 /* the GNU General Public License for more details. */ 14 /* */ 15 /* You should have received a copy of the GNU General Public License */ 16 /* along with this program; if not, write to the Free Software */ 17 /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ 18 /* */ 19 /* Author: Li Zefan <lizf (at) cn.fujitsu.com> */ 20 /* */ 21 /******************************************************************************/ 22 23 #include <sys/mman.h> 24 #include <err.h> 25 #include <math.h> 26 #include <signal.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 31 int flag_exit; 32 int flag_ready; 33 34 int interval; 35 unsigned long memsize; 36 37 char **pages; 38 int nr_page; 39 40 void touch_memory(void) 41 { 42 int i; 43 44 for (i = 0; i < nr_page; i++) 45 pages[i][0] = 0xef; 46 } 47 48 void sigusr_handler(int __attribute__ ((unused)) signo) 49 { 50 int i; 51 int pagesize; 52 53 pagesize = getpagesize(); 54 55 nr_page = ceil((double)memsize / pagesize); 56 57 pages = calloc(nr_page, sizeof(char *)); 58 if (pages == NULL) 59 errx(1, "calloc failed"); 60 61 for (i = 0; i < nr_page; i++) { 62 pages[i] = mmap(NULL, pagesize, PROT_WRITE | PROT_READ, 63 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); 64 if (pages[i] == MAP_FAILED) 65 err(1, "map failed\n"); 66 } 67 68 flag_ready = 1; 69 } 70 71 void sigint_handler(int __attribute__ ((unused)) signo) 72 { 73 flag_exit = 1; 74 } 75 76 int main(int argc, char *argv[]) 77 { 78 char *end; 79 struct sigaction sigint_action; 80 struct sigaction sigusr_action; 81 82 if (argc != 3) 83 errx(1, "wrong argument num"); 84 85 memsize = strtoul(argv[1], &end, 10); 86 if (*end != '\0') 87 errx(1, "wrong memsize"); 88 memsize = memsize * 1024 * 1024; 89 90 interval = atoi(argv[2]); 91 if (interval <= 0) 92 interval = 1; 93 94 /* TODO (garrcoop): add error handling. */ 95 memset(&sigint_action, 0, sizeof(sigint_action)); 96 sigint_action.sa_handler = &sigint_handler; 97 sigaction(SIGINT, &sigint_action, NULL); 98 99 memset(&sigusr_action, 0, sizeof(sigusr_action)); 100 sigusr_action.sa_handler = &sigusr_handler; 101 sigaction(SIGUSR1, &sigusr_action, NULL); 102 103 while (!flag_exit) { 104 sleep(interval); 105 106 if (flag_ready) 107 touch_memory(); 108 } 109 110 return 0; 111 } 112
