diff options
| author |   Bart Van Assche <bart.vanassche@sandisk.com> | 2017-06-20 11:15:38 -0700 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2017-06-20 19:27:14 -0600 |
| commit | 073196787727e454e17a96d222ea55eba2000978 (patch) | |
| tree | 3b0c7733b6cfe467367abbd59fe2e4d59dac730f /include/linux/blk-mq.h | |
| parent | block: stop using bio_data() in blk_write_same_mergeable (diff) | |
| download | linux-dev-073196787727e454e17a96d222ea55eba2000978.tar.xz linux-dev-073196787727e454e17a96d222ea55eba2000978.zip | |
blk-mq: Reduce blk_mq_hw_ctx size
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>
Diffstat (limited to 'include/linux/blk-mq.h')
| -rw-r--r-- | include/linux/blk-mq.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index f1bd13ae8f57..3f2c22a42df6 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -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 { |