linux-kernel - [PATCH 4.14 120/159] block,bfq: Disable writeback throttling

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Date:   Fri, 22 Dec 2017 09:46:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Luca Miccio <lucmiccio@...il.com>,
        Paolo Valente <paolo.valente@...aro.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Lee Tibbert <lee.tibbert@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 120/159] block,bfq: Disable writeback throttling

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Luca Miccio <lucmiccio@...il.com>


[ Upstream commit b5dc5d4d1f4ff9032eb6c21a3c571a1317dc9289 ]

Similarly to CFQ, BFQ has its write-throttling heuristics, and it
is better not to combine them with further write-throttling
heuristics of a different nature.
So this commit disables write-back throttling for a device if BFQ
is used as I/O scheduler for that device.

Signed-off-by: Luca Miccio <lucmiccio@...il.com>
Signed-off-by: Paolo Valente <paolo.valente@...aro.org>
Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>
Tested-by: Lee Tibbert <lee.tibbert@...il.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 block/bfq-iosched.c |    3 ++-
 block/blk-wbt.c     |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -108,6 +108,7 @@
 #include "blk-mq-tag.h"
 #include "blk-mq-sched.h"
 #include "bfq-iosched.h"
+#include "blk-wbt.h"
 
 #define BFQ_BFQQ_FNS(name)						\
 void bfq_mark_bfqq_##name(struct bfq_queue *bfqq)			\
@@ -4775,7 +4776,7 @@ static int bfq_init_queue(struct request
 	bfq_init_root_group(bfqd->root_group, bfqd);
 	bfq_init_entity(&bfqd->oom_bfqq.entity, bfqd->root_group);
 
-
+	wbt_disable_default(q);
 	return 0;
 
 out_free:
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -654,7 +654,7 @@ void wbt_set_write_cache(struct rq_wb *r
 }
 
 /*
- * Disable wbt, if enabled by default. Only called from CFQ.
+ * Disable wbt, if enabled by default.
  */
 void wbt_disable_default(struct request_queue *q)
 {