dedupe.c

   1 #include "fio.h"
   2
   3 int init_dedupe_working_set_seeds(struct thread_data *td)
   4 {
   5         unsigned long long i;
   6         struct frand_state dedupe_working_set_state = {0};
   7
   8         if (!td->o.dedupe_percentage || !(td->o.dedupe_mode == DEDUPE_MODE_WORKING_SET))
   9                 return 0;
  10
  11         /*
  12          * The dedupe working set keeps seeds of unique data (generated by buf_state).
  13          * Dedupe-ed pages will be generated using those seeds.
  14          */
  15         td->num_unique_pages = (td->o.size * (unsigned long long)td->o.dedupe_working_set_percentage / 100) / td->o.min_bs[DDIR_WRITE];
  16         td->dedupe_working_set_states = malloc(sizeof(struct frand_state) * td->num_unique_pages);
  17         if (!td->dedupe_working_set_states) {
  18                 log_err("fio: could not allocate dedupe working set\n");
  19                 return 1;
  20         }
  21         frand_copy(&dedupe_working_set_state, &td->buf_state);
  22         for (i = 0; i < td->num_unique_pages; i++) {
  23                 frand_copy(&td->dedupe_working_set_states[i], &dedupe_working_set_state);
  24                 __get_next_seed(&dedupe_working_set_state);
  25         }
  26
  27         return 0;
  28 }