Jens Axboe
bd166ef183
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 >
2017-01-17 10:04:20 -07:00
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