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| author | Jens Axboe <axboe@fb.com> | 2016-03-30 10:21:08 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-05 17:09:53 -0600 |
| commit | d278d4a8892f13b6a9eb6102b356402f0e062324 (patch) | |
| tree | 2d1f9dc740b6d47257404c02292493568c8ee656 /block/blk-settings.c | |
| parent | 600271d9000027c013c01be87cbb90a5a18c5c3f (diff) | |
| download | lwn-d278d4a8892f13b6a9eb6102b356402f0e062324.tar.gz lwn-d278d4a8892f13b6a9eb6102b356402f0e062324.zip | |
block: add code to track actual device queue depth
For blk-mq, ->nr_requests does track queue depth, at least at init
time. But for the older queue paths, it's simply a soft setting.
On top of that, it's generally larger than the hardware setting
on purpose, to allow backup of requests for merging.
Fill a hole in struct request with a 'queue_depth' member, that
drivers can call to more closely inform the block layer of the
real queue depth.
Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'block/blk-settings.c')
| -rw-r--r-- | block/blk-settings.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 55369a65dea2..9cf053759363 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -837,6 +837,18 @@ void blk_queue_flush_queueable(struct request_queue *q, bool queueable) EXPORT_SYMBOL_GPL(blk_queue_flush_queueable); /** + * blk_set_queue_depth - tell the block layer about the device queue depth + * @q: the request queue for the device + * @depth: queue depth + * + */ +void blk_set_queue_depth(struct request_queue *q, unsigned int depth) +{ + q->queue_depth = depth; +} +EXPORT_SYMBOL(blk_set_queue_depth); + +/** * blk_queue_write_cache - configure queue's write cache * @q: the request queue for the device * @wc: write back cache on or off |