Commit 7535afcc authored Oct 09, 2017 by Luca Miccio Committed by Greg Kroah-Hartman Dec 25, 2017

block,bfq: Disable writeback throttling




[ 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@gmail.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Lee Tibbert <lee.tibbert@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent afdbec5d

block/bfq-iosched.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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_queue q, struct elevator_type e)
		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:

block/blk-wbt.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -654,7 +654,7 @@ void wbt_set_write_cache(struct rq_wb *rwb, bool write_cache_on)
		}

		/*
		* Disable wbt, if enabled by default. Only called from CFQ.
		* Disable wbt, if enabled by default.
		*/
		void wbt_disable_default(struct request_queue *q)
		{