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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>
pull/1250/head
Christoph Hellwig 2025-05-06 17:47:25 +05:30 committed by Jens Axboe
parent d2f526ba27
commit c23acfac10
3 changed files with 12 additions and 0 deletions
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8
Documentation/ABI/stable/sysfs-block
View File

@ -555,6 +555,14 @@ Description:
supported. If supported, valid values are 1 through supported. If supported, valid values are 1 through
max_write_streams, inclusive. 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 What: /sys/block/<disk>/queue/max_segments
Date: March 2010 Date: March 2010
Contact: linux-block@vger.kernel.org Contact: linux-block@vger.kernel.org

3
block/blk-sysfs.c
View File

@ -135,6 +135,7 @@ QUEUE_SYSFS_LIMIT_SHOW(max_discard_segments)
QUEUE_SYSFS_LIMIT_SHOW(max_integrity_segments) QUEUE_SYSFS_LIMIT_SHOW(max_integrity_segments)
QUEUE_SYSFS_LIMIT_SHOW(max_segment_size) QUEUE_SYSFS_LIMIT_SHOW(max_segment_size)
QUEUE_SYSFS_LIMIT_SHOW(max_write_streams) 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(logical_block_size)
QUEUE_SYSFS_LIMIT_SHOW(physical_block_size) QUEUE_SYSFS_LIMIT_SHOW(physical_block_size)
QUEUE_SYSFS_LIMIT_SHOW(chunk_sectors) 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_integrity_segments, "max_integrity_segments");
QUEUE_LIM_RO_ENTRY(queue_max_segment_size, "max_segment_size"); 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_max_write_streams, "max_write_streams");
QUEUE_LIM_RO_ENTRY(queue_write_stream_granularity, "write_stream_granularity");
QUEUE_RW_ENTRY(elv_iosched, "scheduler"); QUEUE_RW_ENTRY(elv_iosched, "scheduler");
QUEUE_LIM_RO_ENTRY(queue_logical_block_size, "logical_block_size"); 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_integrity_segments_entry.attr,
&queue_max_segment_size_entry.attr, &queue_max_segment_size_entry.attr,
&queue_max_write_streams_entry.attr, &queue_max_write_streams_entry.attr,
&queue_write_stream_granularity_entry.attr,
&queue_hw_sector_size_entry.attr, &queue_hw_sector_size_entry.attr,
&queue_logical_block_size_entry.attr, &queue_logical_block_size_entry.attr,
&queue_physical_block_size_entry.attr, &queue_physical_block_size_entry.attr,

1
include/linux/blkdev.h
View File

@ -405,6 +405,7 @@ struct queue_limits {
unsigned short max_discard_segments; unsigned short max_discard_segments;
unsigned short max_write_streams; unsigned short max_write_streams;
unsigned int write_stream_granularity;
unsigned int max_open_zones; unsigned int max_open_zones;
unsigned int max_active_zones; unsigned int max_active_zones;