1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Artificial memory access program for testing DAMON. 4 */ 5 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <time.h> 10 11 enum access_mode { 12 ACCESS_MODE_ONCE, 13 ACCESS_MODE_REPEAT, 14 }; 15 16 int main(int argc, char *argv[]) 17 { 18 char **regions; 19 clock_t start_clock; 20 int nr_regions; 21 int sz_region; 22 int access_time_ms; 23 enum access_mode mode = ACCESS_MODE_ONCE; 24 25 int i; 26 27 if (argc < 4) { 28 printf("Usage: %s <number> <size (bytes)> <time (ms)> [mode]\n", 29 argv[0]); 30 return -1; 31 } 32 33 nr_regions = atoi(argv[1]); 34 sz_region = atoi(argv[2]); 35 access_time_ms = atoi(argv[3]); 36 37 if (argc > 4 && !strcmp(argv[4], "repeat")) 38 mode = ACCESS_MODE_REPEAT; 39 40 regions = malloc(sizeof(*regions) * nr_regions); 41 for (i = 0; i < nr_regions; i++) 42 regions[i] = malloc(sz_region); 43 44 do { 45 for (i = 0; i < nr_regions; i++) { 46 start_clock = clock(); 47 while ((clock() - start_clock) * 1000 / CLOCKS_PER_SEC 48 < access_time_ms) 49 memset(regions[i], i, sz_region); 50 } 51 } while (mode == ACCESS_MODE_REPEAT); 52 53 return 0; 54 } 55