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authorJens Axboe <axboe@fb.com>2017-04-10 18:54:56 +0300
committerJens Axboe <axboe@fb.com>2017-04-28 17:11:43 +0300
commit21c6e939a9f6bb06fe616a87defec0f92a7c3df0 (patch)
tree4313793669d17a93b634236023d5ad3cf1c5ee22 /include/linux/blk-mq.h
parent818cd1cbaa7b00bbc35452a76bebc681a65f1912 (diff)
downloadlinux-21c6e939a9f6bb06fe616a87defec0f92a7c3df0.tar.xz
blk-mq: unify hctx delay_work and run_work
The only difference between ->run_work and ->delay_work, is that the latter is used to defer running a queue. This is done by marking the queue stopped, and scheduling ->delay_work to run sometime in the future. While the queue is stopped, direct runs or runs through ->run_work will not run the queue. If we combine the handlers, then we need to handle two things: 1) If a delayed/stopped run is scheduled, then we should not run the queue before that has been completed. 2) If a queue is delayed/stopped, the handler needs to restart the queue. Normally a run of a queue with the stopped bit set would be a no-op. Case 1 is handled by modifying a currently pending queue run to the deadline set by the caller of blk_mq_delay_queue(). Subsequent attempts to queue a queue run will find the work item already pending, and direct runs will see a stopped queue as before. Case 2 is handled by adding a new bit, BLK_MQ_S_START_ON_RUN, that tells the work handler that it should clear a stopped queue and run the handler. Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/blk-mq.h')
-rw-r--r--include/linux/blk-mq.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index c7cc90328426..f3e5e1de1bdb 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -51,8 +51,6 @@ struct blk_mq_hw_ctx {
atomic_t nr_active;
- struct delayed_work delay_work;
-
struct hlist_node cpuhp_dead;
struct kobject kobj;
@@ -168,6 +166,7 @@ enum {
BLK_MQ_S_TAG_ACTIVE = 1,
BLK_MQ_S_SCHED_RESTART = 2,
BLK_MQ_S_TAG_WAITING = 3,
+ BLK_MQ_S_START_ON_RUN = 4,
BLK_MQ_MAX_DEPTH = 10240,