tools/testing/selftests/damon/access_memory.c

   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 int main(int argc, char *argv[])
  12 {
  13         char **regions;
  14         clock_t start_clock;
  15         int nr_regions;
  16         int sz_region;
  17         int access_time_ms;
  18         int i;
  19
  20         if (argc != 4) {
  21                 printf("Usage: %s <number> <size (bytes)> <time (ms)>\n",
  22                                 argv[0]);
  23                 return -1;
  24         }
  25
  26         nr_regions = atoi(argv[1]);
  27         sz_region = atoi(argv[2]);
  28         access_time_ms = atoi(argv[3]);
  29
  30         regions = malloc(sizeof(*regions) * nr_regions);
  31         for (i = 0; i < nr_regions; i++)
  32                 regions[i] = malloc(sz_region);
  33
  34         for (i = 0; i < nr_regions; i++) {
  35                 start_clock = clock();
  36                 while ((clock() - start_clock) * 1000 / CLOCKS_PER_SEC <
  37                                 access_time_ms)
  38                         memset(regions[i], i, sz_region);
  39         }
  40         return 0;
  41 }