Gh0st
/
linux
mirror of https://github.com/torvalds/linux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

bcache: remove discard sysfs interface document 

This patch removes documents of bcache discard sysfs interface, it
drops discard related sections from,
- Documentation/ABI/testing/sysfs-block-bcache
- Documentation/admin-guide/bcache.rst

Signed-off-by: Coly Li <colyli@fnnas.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2025-11-13 13:36:25 +08:00 committed by Jens Axboe
parent 73a004f83c
commit 7bf90cd740
2 changed files with 2 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/ABI/testing/sysfs-block-bcache
View File

@ -106,13 +106,6 @@ Description:
will be discarded from the cache. Should not be turned off with
writeback caching enabled.
What: /sys/block/<disk>/bcache/discard
Date: November 2010
Contact: Kent Overstreet <kent.overstreet@gmail.com>
Description:
For a cache, a boolean allowing discard/TRIM to be turned off
or back on if the device supports it.
What: /sys/block/<disk>/bcache/bucket_size
Date: November 2010
Contact: Kent Overstreet <kent.overstreet@gmail.com>

13
Documentation/admin-guide/bcache.rst
View File

@ -17,8 +17,7 @@ The latest bcache kernel code can be found from mainline Linux kernel:
It's designed around the performance characteristics of SSDs - it only allocates
in erase block sized buckets, and it uses a hybrid btree/log to track cached
extents (which can be anywhere from a single sector to the bucket size). It's
designed to avoid random writes at all costs; it fills up an erase block
sequentially, then issues a discard before reusing it.
designed to avoid random writes at all costs.
Both writethrough and writeback caching are supported. Writeback defaults to
off, but can be switched on and off arbitrarily at runtime. Bcache goes to
@ -618,19 +617,11 @@ bucket_size
cache_replacement_policy
One of either lru, fifo or random.
discard
Boolean; if on a discard/TRIM will be issued to each bucket before it is
reused. Defaults to off, since SATA TRIM is an unqueued command (and thus
slow).
freelist_percent
Size of the freelist as a percentage of nbuckets. Can be written to to
increase the number of buckets kept on the freelist, which lets you
artificially reduce the size of the cache at runtime. Mostly for testing
purposes (i.e. testing how different size caches affect your hit rate), but
since buckets are discarded when they move on to the freelist will also make
the SSD's garbage collection easier by effectively giving it more reserved
space.
purposes (i.e. testing how different size caches affect your hit rate).
io_errors
Number of errors that have occurred, decayed by io_error_halflife.