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| author |   Jens Axboe <axboe@kernel.dk> | 2017-06-26 08:15:27 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-06-27 12:05:31 -0600 |
| commit | f793dfd3f39a3dc50468b06498606b3a906f42f1 (patch) | |
| tree | 5bce7522f30a29ec7931e6b1cdc5d37f9e60b13e /include/linux/blkdev.h | |
| parent | block: add support for write hints in a bio (diff) | |
| download | linux-dev-f793dfd3f39a3dc50468b06498606b3a906f42f1.tar.xz linux-dev-f793dfd3f39a3dc50468b06498606b3a906f42f1.zip | |
blk-mq: expose write hints through debugfs
Useful to verify that things are working the way they should.
Reading the file will return number of kb written with each
write hint. Writing the file will reset the statistics. No care
is taken to ensure that we don't race on updates.
Drivers will write to q->write_hints[] if they handle a given
write hint.
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 0eebd3bcfd85..e1e289ab66b9 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -596,6 +596,9 @@ struct request_queue { void *rq_alloc_data; struct work_struct release_work; + +#define BLK_MAX_WRITE_HINTS 5 + u64 write_hints[BLK_MAX_WRITE_HINTS]; }; #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |