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blk-mq: Reduce blk_mq_hw_ctx size

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Since the srcu structure is rather large (184 bytes on an x86-64
system with kernel debugging disabled), only allocate it if needed.

Reported-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche
2017-06-20 11:15:38 -07:00
committed by Jens Axboe
parent efbeccdb59
commit 0731967877
2 changed files with 25 additions and 10 deletions
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5
include/linux/blk-mq.h
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@@ -39,8 +39,6 @@ struct blk_mq_hw_ctx {
struct blk_mq_tags *tags;
struct blk_mq_tags *sched_tags;
struct srcu_struct queue_rq_srcu;
unsigned long queued;
unsigned long run;
#define BLK_MQ_MAX_DISPATCH_ORDER 7
@@ -62,6 +60,9 @@ struct blk_mq_hw_ctx {
struct dentry *debugfs_dir;
struct dentry *sched_debugfs_dir;
#endif
/* Must be the last member - see also blk_mq_hw_ctx_size(). */
struct srcu_struct queue_rq_srcu[0];
};
struct blk_mq_tag_set {