Add support for non-uniformly random file service type

[fio.git] / file.h

diff --git a/file.h b/file.h
index e7563b84638490ffda75998576ce57b492c012c7..0cf622fcbb213a7922ecb96a8e7b7f88bd76b2f2 100644 (file)
--- a/file.h
+++ b/file.h
@@ -39,13 +39,20 @@ enum file_lock_mode {
 };
 
 /*
- * roundrobin available files, or choose one at random, or do each one
- * serially.
+ * How fio chooses what file to service next. Choice of uniformly random, or
+ * some skewed random variants, or just sequentially go through them or
+ * roundrobing.
  */
 enum {
-       FIO_FSERVICE_RANDOM     = 1,
-       FIO_FSERVICE_RR         = 2,
-       FIO_FSERVICE_SEQ        = 3,
+       FIO_FSERVICE_RANDOM             = 1,
+       FIO_FSERVICE_RR                 = 2,
+       FIO_FSERVICE_SEQ                = 3,
+       __FIO_FSERVICE_NONUNIFORM       = 0x100,
+       FIO_FSERVICE_ZIPF               = __FIO_FSERVICE_NONUNIFORM | 4,
+       FIO_FSERVICE_PARETO             = __FIO_FSERVICE_NONUNIFORM | 5,
+       FIO_FSERVICE_GAUSS              = __FIO_FSERVICE_NONUNIFORM | 6,
+
+       FIO_FSERVICE_SHIFT              = 10,
 };
 
 /*