diff options
| author | Paolo Valente <paolo.valente@linaro.org> | 2019-01-29 12:06:29 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-01-31 12:50:23 -0700 |
| commit | 73d58118498b14e4d2f2391105459b997b586ddc (patch) | |
| tree | 71e72676425a3eaa6e6ebe582ce27994d1eafbf2 /block/bfq-iosched.h | |
| parent | 03e565e4204c6cf8687d995de5cafd0341503b4e (diff) | |
| download | linux-73d58118498b14e4d2f2391105459b997b586ddc.tar.bz2 | |
block, bfq: consider also ioprio classes in symmetry detection
In asymmetric scenarios, i.e., when some bfq_queue or bfq_group needs to
be guaranteed a different bandwidth than other bfq_queues or bfq_groups,
these service guaranteed can be provided only by plugging I/O dispatch,
completely or partially, when the queue in service remains temporarily
empty. A case where asymmetry is particularly strong is when some active
bfq_queues belong to a higher-priority class than some other active
bfq_queues. Unfortunately, this important case is not considered at all
in the code for detecting asymmetric scenarios. This commit adds the
missing logic.
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bfq-iosched.h')
| -rw-r--r-- | block/bfq-iosched.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h index 0b02bf302de0..30be669be465 100644 --- a/block/bfq-iosched.h +++ b/block/bfq-iosched.h @@ -501,10 +501,11 @@ struct bfq_data { unsigned int num_groups_with_pending_reqs; /* - * Number of bfq_queues containing requests (including the - * queue in service, even if it is idling). + * Per-class (RT, BE, IDLE) number of bfq_queues containing + * requests (including the queue in service, even if it is + * idling). */ - int busy_queues; + unsigned int busy_queues[3]; /* number of weight-raised busy @bfq_queues */ int wr_busy_queues; /* number of queued requests */ @@ -974,6 +975,7 @@ extern struct blkcg_policy blkcg_policy_bfq; struct bfq_group *bfq_bfqq_to_bfqg(struct bfq_queue *bfqq); struct bfq_queue *bfq_entity_to_bfqq(struct bfq_entity *entity); +unsigned int bfq_tot_busy_queues(struct bfq_data *bfqd); struct bfq_service_tree *bfq_entity_service_tree(struct bfq_entity *entity); struct bfq_entity *bfq_entity_of(struct rb_node *node); unsigned short bfq_ioprio_to_weight(int ioprio); |