[PATCH] deadline scheduler

This introduces the deadline-ioscheduler, making it the default.  2nd
patch coming that deletes elevator_linus in a minute.

This one has read_expire at 500ms, and writes_starved at 2.

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index e98168f92e67..8e4ca13c458a 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -60,6 +60,12 @@ extern elevator_t elevator_linus;
 #define ELV_LINUS_SEEK_COST	16
 
 /*
+ * deadline i/o scheduler. uses request time outs to prevent indefinite
+ * starvation
+ */
+extern elevator_t iosched_deadline;
+
+/*
  * use the /proc/iosched interface, all the below is history ->
  */
 typedef struct blkelv_ioctl_arg_s {