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-rw-r--r--dedupe.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/dedupe.c b/dedupe.c
new file mode 100644
index 00000000..043a376c
--- /dev/null
+++ b/dedupe.c
@@ -0,0 +1,28 @@
+#include "fio.h"
+
+int init_dedupe_working_set_seeds(struct thread_data *td)
+{
+ unsigned long long i;
+ struct frand_state dedupe_working_set_state = {0};
+
+ if (!td->o.dedupe_percentage || !(td->o.dedupe_mode == DEDUPE_MODE_WORKING_SET))
+ return 0;
+
+ /*
+ * The dedupe working set keeps seeds of unique data (generated by buf_state).
+ * Dedupe-ed pages will be generated using those seeds.
+ */
+ td->num_unique_pages = (td->o.size * (unsigned long long)td->o.dedupe_working_set_percentage / 100) / td->o.min_bs[DDIR_WRITE];
+ td->dedupe_working_set_states = malloc(sizeof(struct frand_state) * td->num_unique_pages);
+ if (!td->dedupe_working_set_states) {
+ log_err("fio: could not allocate dedupe working set\n");
+ return 1;
+ }
+ frand_copy(&dedupe_working_set_state, &td->buf_state);
+ for (i = 0; i < td->num_unique_pages; i++) {
+ frand_copy(&td->dedupe_working_set_states[i], &dedupe_working_set_state);
+ __get_next_seed(&dedupe_working_set_state);
+ }
+
+ return 0;
+}