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blk-mq-sched: add framework for MQ capable IO schedulers

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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>
This commit is contained in:
Jens Axboe
2017-01-17 06:03:22 -07:00
parent 2af8cbe305
commit bd166ef183
17 changed files with 983 additions and 193 deletions
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4
include/linux/blkdev.h
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@@ -154,6 +154,7 @@ struct request {
/* the following two fields are internal, NEVER access directly */
unsigned int __data_len; /* total data len */
int tag;
sector_t __sector; /* sector cursor */
struct bio *bio;
@@ -220,9 +221,10 @@ struct request {
unsigned short ioprio;
int internal_tag;
void *special; /* opaque pointer available for LLD use */
int tag;
int errors;
/*