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authorBart Van Assche <bart.vanassche@sandisk.com>2017-06-20 11:15:38 -0700
committerJens Axboe <axboe@kernel.dk>2017-06-20 19:27:14 -0600
commit073196787727e454e17a96d222ea55eba2000978 (patch)
tree3b0c7733b6cfe467367abbd59fe2e4d59dac730f /include
parentefbeccdb59d666b9c77d505af01097cc0a9d102b (diff)
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')
-rw-r--r--include/linux/blk-mq.h5
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 {

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