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cfq-iosched: fix the setting of IOPS mode on SSDs

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A previous commit wanted to make CFQ default to IOPS mode on
non-rotational storage, however it did so when the queue was
initialized and the non-rotational flag is only set later on
in the probe.

Add an elevator hook that gets called off the add_disk() path,
at that point we know that feature probing has finished, and
we can reliably check for the various flags that drivers can
set.

Fixes: 41c0126b ("block: Make CFQ default to IOPS mode on SSDs")
Tested-by: Romain Francoise <romain@orebokech.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2015-06-10 08:01:20 -06:00
parent ae11f7efda
commit 0bb979472a
3 changed files with 18 additions and 1 deletions
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15
block/cfq-iosched.c
View File

@ -4508,7 +4508,7 @@ static int cfq_init_queue(struct request_queue *q, struct elevator_type *e)
cfqd->cfq_slice[1] = cfq_slice_sync;
cfqd->cfq_target_latency = cfq_target_latency;
cfqd->cfq_slice_async_rq = cfq_slice_async_rq;
cfqd->cfq_slice_idle = blk_queue_nonrot(q) ? 0 : cfq_slice_idle;
cfqd->cfq_slice_idle = cfq_slice_idle;
cfqd->cfq_group_idle = cfq_group_idle;
cfqd->cfq_latency = 1;
cfqd->hw_tag = -1;
@ -4525,6 +4525,18 @@ out_free:
return ret;
}
static void cfq_registered_queue(struct request_queue *q)
{
struct elevator_queue *e = q->elevator;
struct cfq_data *cfqd = e->elevator_data;
/*
* Default to IOPS mode with no idling for SSDs
*/
if (blk_queue_nonrot(q))
cfqd->cfq_slice_idle = 0;
}
/*
* sysfs parts below -->
*/
@ -4640,6 +4652,7 @@ static struct elevator_type iosched_cfq = {
.elevator_may_queue_fn = cfq_may_queue,
.elevator_init_fn = cfq_init_queue,
.elevator_exit_fn = cfq_exit_queue,
.elevator_registered_fn = cfq_registered_queue,
},
.icq_size = sizeof(struct cfq_io_cq),
.icq_align = __alignof__(struct cfq_io_cq),

2
block/elevator.c
View File

@ -810,6 +810,8 @@ int elv_register_queue(struct request_queue *q)
}
kobject_uevent(&e->kobj, KOBJ_ADD);
e->registered = 1;
if (e->type->ops.elevator_registered_fn)
e->type->ops.elevator_registered_fn(q);
}
return error;
}

2
include/linux/elevator.h
View File

@ -39,6 +39,7 @@ typedef void (elevator_deactivate_req_fn) (struct request_queue *, struct reques
typedef int (elevator_init_fn) (struct request_queue *,
struct elevator_type *e);
typedef void (elevator_exit_fn) (struct elevator_queue *);
typedef void (elevator_registered_fn) (struct request_queue *);
struct elevator_ops
{
@ -68,6 +69,7 @@ struct elevator_ops
elevator_init_fn *elevator_init_fn;
elevator_exit_fn *elevator_exit_fn;
elevator_registered_fn *elevator_registered_fn;
};
#define ELV_NAME_MAX (16)