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authorJohn Garry <john.garry@huawei.com>2020-08-19 23:20:26 +0800
committerJens Axboe <axboe@kernel.dk>2020-09-03 15:20:47 -0600
commitbccf5e26d99c28980bd6ced474422a1b18402263 (patch)
tree27af81c6aa730aea28de03b248624a55e6972563 /block/blk-mq.h
parenta0235d230f3245aa4bd70b514d5effb24be61acd (diff)
downloadlinux-bccf5e26d99c28980bd6ced474422a1b18402263.tar.bz2
blk-mq: Record nr_active_requests per queue for when using shared sbitmap
The per-hctx nr_active value can no longer be used to fairly assign a share of tag depth per request queue for when using a shared sbitmap, as it does not consider that the tags are shared tags over all hctx's. For this case, record the nr_active_requests per request_queue, and make the judgement based on that value. Co-developed-with: Kashyap Desai <kashyap.desai@broadcom.com> Signed-off-by: John Garry <john.garry@huawei.com> Tested-by: Don Brace<don.brace@microsemi.com> #SCSI resv cmds patches used Tested-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
-rw-r--r--block/blk-mq.h26
1 files changed, 24 insertions, 2 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 56dc37c21908..25ec73078e95 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -199,6 +199,28 @@ static inline bool blk_mq_get_dispatch_budget(struct request_queue *q)
return true;
}
+static inline void __blk_mq_inc_active_requests(struct blk_mq_hw_ctx *hctx)
+{
+ if (blk_mq_is_sbitmap_shared(hctx->flags))
+ atomic_inc(&hctx->queue->nr_active_requests_shared_sbitmap);
+ else
+ atomic_inc(&hctx->nr_active);
+}
+
+static inline void __blk_mq_dec_active_requests(struct blk_mq_hw_ctx *hctx)
+{
+ if (blk_mq_is_sbitmap_shared(hctx->flags))
+ atomic_dec(&hctx->queue->nr_active_requests_shared_sbitmap);
+ else
+ atomic_dec(&hctx->nr_active);
+}
+
+static inline int __blk_mq_active_requests(struct blk_mq_hw_ctx *hctx)
+{
+ if (blk_mq_is_sbitmap_shared(hctx->flags))
+ return atomic_read(&hctx->queue->nr_active_requests_shared_sbitmap);
+ return atomic_read(&hctx->nr_active);
+}
static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
struct request *rq)
{
@@ -207,7 +229,7 @@ static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
if (rq->rq_flags & RQF_MQ_INFLIGHT) {
rq->rq_flags &= ~RQF_MQ_INFLIGHT;
- atomic_dec(&hctx->nr_active);
+ __blk_mq_dec_active_requests(hctx);
}
}
@@ -287,7 +309,7 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
* Allow at least some tags
*/
depth = max((bt->sb.depth + users - 1) / users, 4U);
- return atomic_read(&hctx->nr_active) < depth;
+ return __blk_mq_active_requests(hctx) < depth;
}