ZEN: INTERACTIVE: Use BFQ as our elevator

heftig · heftig · commit 07b36ce250f2 · 2020-01-27T21:33:17.000+01:00
Add a scheduler even to multi-queue block devices: We prefer
interactivity to throughput and want BFQ if possible.
diff --git a/block/elevator.c b/block/elevator.c
@@ -628,10 +628,14 @@ static inline bool elv_support_iosched(struct request_queue *q)
  */
 static struct elevator_type *elevator_get_default(struct request_queue *q)
 {
+#ifndef CONFIG_ZEN_INTERACTIVE
 	if (q->nr_hw_queues != 1)
 		return NULL;
+#endif
 
-#if defined(CONFIG_MQ_IOSCHED_DEADLINE_NODEFAULT)
+#if defined(CONFIG_ZEN_INTERACTIVE) && defined(CONFIG_IOSCHED_BFQ)
+	return elevator_get(q, "bfq", false);
+#elif defined(CONFIG_MQ_IOSCHED_DEADLINE_NODEFAULT)
 	return elevator_get(q, "mq-deadline-nodefault", false);
 #else
 	return elevator_get(q, "mq-deadline", false);
diff --git a/init/Kconfig b/init/Kconfig
@@ -79,6 +79,10 @@ config ZEN_INTERACTIVE
 	help
 	  Tunes the kernel for responsiveness at the cost of throughput and power usage.
 
+	  --- Block Layer ----------------------------------------
+
+	    Default scheduler.........: mq-deadline -> bfq
+
 config BROKEN
 	bool
 
