diff options
| author | Eric Biggers <[email protected]> | 2021-12-08 16:38:30 -0800 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2022-01-09 18:59:10 -0700 |
| commit | 1163010418a7f0c60c309743498cb6c5cd828ecc (patch) | |
| tree | 869cd622ef337cd7d8a99c085f76cb125189929d | |
| parent | 849ab826e10531f106846e8e9eeae8d00a198f6e (diff) | |
docs: sysfs-block: document stable_writes
/sys/block/<disk>/queue/stable_writes is completely undocumented.
Document it.
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Eric Biggers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
| -rw-r--r-- | Documentation/ABI/stable/sysfs-block | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index de3b86a3dfa5..288626e8cb53 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -516,6 +516,23 @@ Description: scheduler module, if it isn't already present in the system. +What: /sys/block/<disk>/queue/stable_writes +Date: September 2020 +Contact: [email protected] +Description: + [RW] This file will contain '1' if memory must not be modified + while it is being used in a write request to this device. When + this is the case and the kernel is performing writeback of a + page, the kernel will wait for writeback to complete before + allowing the page to be modified again, rather than allowing + immediate modification as is normally the case. This + restriction arises when the device accesses the memory multiple + times where the same data must be seen every time -- for + example, once to calculate a checksum and once to actually write + the data. If no such restriction exists, this file will contain + '0'. This file is writable for testing purposes. + + What: /sys/block/<disk>/queue/throttle_sample_time Date: March 2017 Contact: [email protected] |