From: Jens Axboe <axboe@kernel.dk>
To: linux-block@vger.kernel.org
Cc: osandov@fb.com, efault@gmx.de, paolo.valente@linaro.org,
Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 1/7] blk-mq: don't call into depth limiting for reserved tags
Date: Wed, 9 May 2018 14:49:21 -0600 [thread overview]
Message-ID: <1525898967-13425-2-git-send-email-axboe@kernel.dk> (raw)
In-Reply-To: <1525898967-13425-1-git-send-email-axboe@kernel.dk>
It's not useful, they are internal and/or error handling recovery
commands.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/blk-mq.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4e9d83594cca..64630caaf27e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -360,9 +360,11 @@ static struct request *blk_mq_get_request(struct request_queue *q,
/*
* Flush requests are special and go directly to the
- * dispatch list.
+ * dispatch list. Don't include reserved tags in the
+ * limiting, as it isn't useful.
*/
- if (!op_is_flush(op) && e->type->ops.mq.limit_depth)
+ if (!op_is_flush(op) && e->type->ops.mq.limit_depth &&
+ !(data->flags & BLK_MQ_REQ_RESERVED))
e->type->ops.mq.limit_depth(op, data);
}
--
2.7.4
next prev parent reply other threads:[~2018-05-09 20:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-09 20:49 [PATCHSET v2 0/7] blk-mq-sched and sbitmap shallow depth Jens Axboe
2018-05-09 20:49 ` Jens Axboe [this message]
2018-05-09 20:49 ` [PATCH 2/7] bfq-iosched: don't worry about reserved tags in limit_depth Jens Axboe
2018-05-09 20:49 ` [PATCH 3/7] bfq: calculate shallow depths at init time Jens Axboe
2018-05-09 20:49 ` [PATCH 4/7] sbitmap: add helper to inform the core about shallow depth limiting Jens Axboe
2018-05-09 20:49 ` [PATCH 5/7] bfq-iosched: update shallow depth to smallest one used Jens Axboe
2018-05-09 20:49 ` [PATCH 6/7] bfq-iosched: remove unused variable Jens Axboe
2018-05-09 20:49 ` [PATCH 7/7] kyber-iosched: update shallow depth when setting up hardware queue Jens Axboe
2018-05-10 4:32 ` [PATCHSET v2 0/7] blk-mq-sched and sbitmap shallow depth Paolo Valente
2018-05-10 16:20 ` Jens Axboe
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