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block,bfq: Disable writeback throttling

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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>
This commit is contained in:
Luca Miccio 2017-10-09 16:27:21 +02:00 committed by Jens Axboe
parent 94af584692
commit b5dc5d4d1f
2 changed files with 3 additions and 2 deletions
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3
block/bfq-iosched.c
View File

@ -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) \
@ -4810,7 +4811,7 @@ 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:

2
block/blk-wbt.c
View File

@ -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)
{