diff options
| author | Eric Biggers <ebiggers@google.com> | 2021-12-08 16:38:30 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-01-09 18:59:10 -0700 |
| commit | 1163010418a7f0c60c309743498cb6c5cd828ecc (patch) | |
| tree | 869cd622ef337cd7d8a99c085f76cb125189929d /Documentation/ABI/stable | |
| 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 <bvanassche@acm.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20211209003833.6396-6-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/ABI/stable')
| -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: linux-block@vger.kernel.org +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: linux-block@vger.kernel.org |