diff options
| author | Jens Axboe <axboe@fb.com> | 2017-02-22 13:19:45 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-02-22 13:19:45 -0700 |
| commit | b86dd815ff74ab9eda474d1c28428ac0db2c3032 (patch) | |
| tree | d2492456261c6394b10ec03e53a6d75180986ef6 /block | |
| parent | eed64951f15d63beac75e0f848ac03c14f8a4a6c (diff) | |
| download | linux-b86dd815ff74ab9eda474d1c28428ac0db2c3032.tar.bz2 | |
block: get rid of blk-mq default scheduler choice Kconfig entries
The wording in the entries were poor and not understandable
by even deities. Kill the selection for default block scheduler,
and impose a policy with sane defaults.
Architected-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/Kconfig.iosched | 44 | ||||
| -rw-r--r-- | block/blk-mq-sched.c | 9 | ||||
| -rw-r--r-- | block/elevator.c | 19 |
3 files changed, 13 insertions, 59 deletions
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched index 0715ce93daef..58fc8684788d 100644 --- a/block/Kconfig.iosched +++ b/block/Kconfig.iosched @@ -69,50 +69,6 @@ config MQ_IOSCHED_DEADLINE ---help--- MQ version of the deadline IO scheduler. -config MQ_IOSCHED_NONE - bool - default y - -choice - prompt "Default single-queue blk-mq I/O scheduler" - default DEFAULT_SQ_NONE - help - Select the I/O scheduler which will be used by default for blk-mq - managed block devices with a single queue. - - config DEFAULT_SQ_DEADLINE - bool "MQ Deadline" if MQ_IOSCHED_DEADLINE=y - - config DEFAULT_SQ_NONE - bool "None" - -endchoice - -config DEFAULT_SQ_IOSCHED - string - default "mq-deadline" if DEFAULT_SQ_DEADLINE - default "none" if DEFAULT_SQ_NONE - -choice - prompt "Default multi-queue blk-mq I/O scheduler" - default DEFAULT_MQ_NONE - help - Select the I/O scheduler which will be used by default for blk-mq - managed block devices with multiple queues. - - config DEFAULT_MQ_DEADLINE - bool "MQ Deadline" if MQ_IOSCHED_DEADLINE=y - - config DEFAULT_MQ_NONE - bool "None" - -endchoice - -config DEFAULT_MQ_IOSCHED - string - default "mq-deadline" if DEFAULT_MQ_DEADLINE - default "none" if DEFAULT_MQ_NONE - endmenu endif diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index 9e8d6795a8c1..c14f92308244 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -498,15 +498,6 @@ int blk_mq_sched_init(struct request_queue *q) { int ret; -#if defined(CONFIG_DEFAULT_SQ_NONE) - if (q->nr_hw_queues == 1) - return 0; -#endif -#if defined(CONFIG_DEFAULT_MQ_NONE) - if (q->nr_hw_queues > 1) - return 0; -#endif - mutex_lock(&q->sysfs_lock); ret = elevator_init(q, NULL); mutex_unlock(&q->sysfs_lock); diff --git a/block/elevator.c b/block/elevator.c index 699d10f71a2c..ac1c9f481a98 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -220,17 +220,24 @@ int elevator_init(struct request_queue *q, char *name) } if (!e) { - if (q->mq_ops && q->nr_hw_queues == 1) - e = elevator_get(CONFIG_DEFAULT_SQ_IOSCHED, false); - else if (q->mq_ops) - e = elevator_get(CONFIG_DEFAULT_MQ_IOSCHED, false); - else + /* + * For blk-mq devices, we default to using mq-deadline, + * if available, for single queue devices. If deadline + * isn't available OR we have multiple queues, default + * to "none". + */ + if (q->mq_ops) { + if (q->nr_hw_queues == 1) + e = elevator_get("mq-deadline", false); + if (!e) + return 0; + } else e = elevator_get(CONFIG_DEFAULT_IOSCHED, false); if (!e) { printk(KERN_ERR "Default I/O scheduler not found. " \ - "Using noop/none.\n"); + "Using noop.\n"); e = elevator_get("noop", false); } } |