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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: "Jan Alexander Steffens (heftig)" <jan.steffens@gmail.com>
Date: Mon, 27 Jan 2020 18:11:05 +0100
Subject: [PATCH] ZEN: INTERACTIVE: Use BFQ as our elevator
Add a scheduler even to multi-queue block devices: We prefer
interactivity to throughput and want BFQ if possible.
---
block/elevator.c | 6 +++++-
init/Kconfig | 4 ++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/block/elevator.c b/block/elevator.c
index 1f14fda7597de2e7cbacea73c84e6886fb79db3d..a00dc913255e6efd42a0b216bbbfdfa95854135b 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -638,11 +638,15 @@ static struct elevator_type *elevator_get_default(struct request_queue *q)
if (q->tag_set && q->tag_set->flags & BLK_MQ_F_NO_SCHED_BY_DEFAULT)
return NULL;
+#ifndef CONFIG_ZEN_INTERACTIVE
if (q->nr_hw_queues != 1 &&
!blk_mq_is_shared_tags(q->tag_set->flags))
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
index ac7fccdfa0bee8c8644d40b28829aeda12949a74..58bea73b06fc6f759b4f3ef2ace11a07987f3714 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -117,6 +117,10 @@ 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
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