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| author | Jens Axboe <axboe@fb.com> | 2017-01-17 06:03:22 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-01-17 10:04:20 -0700 |
| commit | bd166ef183c263c5ced656d49ef19c7da4adc774 (patch) | |
| tree | 449bbd3b4e671b370b96e3846b2281116e7089e9 /block/blk-merge.c | |
| parent | 2af8cbe30531eca73c8f3ba277f155fc0020b01a (diff) | |
| download | linux-0-day-bd166ef183c263c5ced656d49ef19c7da4adc774.tar.gz linux-0-day-bd166ef183c263c5ced656d49ef19c7da4adc774.tar.xz | |
blk-mq-sched: add framework for MQ capable IO schedulers
This adds a set of hooks that intercepts the blk-mq path of
allocating/inserting/issuing/completing requests, allowing
us to develop a scheduler within that framework.
We reuse the existing elevator scheduler API on the registration
side, but augment that with the scheduler flagging support for
the blk-mq interfce, and with a separate set of ops hooks for MQ
devices.
We split driver and scheduler tags, so we can run the scheduling
independently of device queue depth.
Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Diffstat (limited to 'block/blk-merge.c')
| -rw-r--r-- | block/blk-merge.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 480570b691dc6..6aa43dec5af49 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -763,7 +763,7 @@ int blk_attempt_req_merge(struct request_queue *q, struct request *rq, { struct elevator_queue *e = q->elevator; - if (e->type->ops.sq.elevator_allow_rq_merge_fn) + if (!e->uses_mq && e->type->ops.sq.elevator_allow_rq_merge_fn) if (!e->type->ops.sq.elevator_allow_rq_merge_fn(q, rq, next)) return 0; |