diff options
| author | Christoph Hellwig <hch@lst.de> | 2025-05-06 17:47:25 +0530 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-05-06 07:46:43 -0600 |
| commit | c23acfac10786ac5062a0615e23e68b913ac8da0 (patch) | |
| tree | 5f43ddf6849a05e0541e0138466ebb7f79331e1e | |
| parent | d2f526ba27d29c442542f7c5df0a86ef0b576716 (diff) | |
block: introduce a write_stream_granularity queue limit
Export the granularity that write streams should be discarded with,
as it is essential for making good use of them.
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20250506121732.8211-5-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | Documentation/ABI/stable/sysfs-block | 8 | ||||
| -rw-r--r-- | block/blk-sysfs.c | 3 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 1 |
3 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index 8bbe1eca28df..4ba771b56b3b 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -555,6 +555,14 @@ Description: supported. If supported, valid values are 1 through max_write_streams, inclusive. +What: /sys/block/<disk>/queue/write_stream_granularity +Date: November 2024 +Contact: linux-block@vger.kernel.org +Description: + [RO] Granularity of a write stream in bytes. The granularity + of a write stream is the size that should be discarded or + overwritten together to avoid write amplification in the device. + What: /sys/block/<disk>/queue/max_segments Date: March 2010 Contact: linux-block@vger.kernel.org diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 5934150d4204..386374ff655b 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -135,6 +135,7 @@ QUEUE_SYSFS_LIMIT_SHOW(max_discard_segments) QUEUE_SYSFS_LIMIT_SHOW(max_integrity_segments) QUEUE_SYSFS_LIMIT_SHOW(max_segment_size) QUEUE_SYSFS_LIMIT_SHOW(max_write_streams) +QUEUE_SYSFS_LIMIT_SHOW(write_stream_granularity) QUEUE_SYSFS_LIMIT_SHOW(logical_block_size) QUEUE_SYSFS_LIMIT_SHOW(physical_block_size) QUEUE_SYSFS_LIMIT_SHOW(chunk_sectors) @@ -490,6 +491,7 @@ QUEUE_LIM_RO_ENTRY(queue_max_segments, "max_segments"); QUEUE_LIM_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments"); QUEUE_LIM_RO_ENTRY(queue_max_segment_size, "max_segment_size"); QUEUE_LIM_RO_ENTRY(queue_max_write_streams, "max_write_streams"); +QUEUE_LIM_RO_ENTRY(queue_write_stream_granularity, "write_stream_granularity"); QUEUE_RW_ENTRY(elv_iosched, "scheduler"); QUEUE_LIM_RO_ENTRY(queue_logical_block_size, "logical_block_size"); @@ -645,6 +647,7 @@ static struct attribute *queue_attrs[] = { &queue_max_integrity_segments_entry.attr, &queue_max_segment_size_entry.attr, &queue_max_write_streams_entry.attr, + &queue_write_stream_granularity_entry.attr, &queue_hw_sector_size_entry.attr, &queue_logical_block_size_entry.attr, &queue_physical_block_size_entry.attr, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 13e1426ad38d..52b7a27c46e8 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -405,6 +405,7 @@ struct queue_limits { unsigned short max_discard_segments; unsigned short max_write_streams; + unsigned int write_stream_granularity; unsigned int max_open_zones; unsigned int max_active_zones; |