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blk-mq: move the srcu_struct used for quiescing to the tagset

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All I/O submissions have fairly similar latencies, and a tagset-wide
quiesce is a fairly common operation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Chao Leng <lengchao@huawei.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221101150050.3510-12-hch@lst.de
[axboe: fix whitespace]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2022-11-01 16:00:47 +01:00
committed by Jens Axboe
parent 8537380bb9
commit 80bd4a7aab
8 changed files with 45 additions and 62 deletions
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4
include/linux/blk-mq.h
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@@ -7,6 +7,7 @@
#include <linux/lockdep.h>
#include <linux/scatterlist.h>
#include <linux/prefetch.h>
#include <linux/srcu.h>
struct blk_mq_tags;
struct blk_flush_queue;
@@ -500,6 +501,8 @@ enum hctx_type {
* @tag_list_lock: Serializes tag_list accesses.
* @tag_list: List of the request queues that use this tag set. See also
* request_queue.tag_set_list.
* @srcu: Use as lock when type of the request queue is blocking
* (BLK_MQ_F_BLOCKING).
*/
struct blk_mq_tag_set {
struct blk_mq_queue_map map[HCTX_MAX_TYPES];
@@ -520,6 +523,7 @@ struct blk_mq_tag_set {
struct mutex tag_list_lock;
struct list_head tag_list;
struct srcu_struct *srcu;
};
/**