diff options
| author | Vincent Fu <vincent.fu@samsung.com> | 2022-07-08 17:49:49 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-08-02 17:14:50 -0600 |
| commit | 058efe000b31ce9c63bca02a33b67780b0ef5b41 (patch) | |
| tree | b8903aafe78fb95b727a58174aa0955c2f8bb34f /Documentation/block | |
| parent | ce11bdf946176d48c2c0d36b56f0bf368c177298 (diff) | |
null_blk: add module parameters for 4 options
Add as module parameters these options:
memory_backed
discard
mbps
cache_size
Previously these could only be set via configfs.
Still missing is bad_blocks.
The kernel test robot found a documentation formatting issue in v1 of
this patch.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>
Link: https://lore.kernel.org/r/20220708174943.87787-2-vincent.fu@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/block')
| -rw-r--r-- | Documentation/block/null_blk.rst | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/block/null_blk.rst b/Documentation/block/null_blk.rst index edbbab2f12f8..4dd78f24d10a 100644 --- a/Documentation/block/null_blk.rst +++ b/Documentation/block/null_blk.rst @@ -72,6 +72,28 @@ submit_queues=[1..nr_cpus]: Default: 1 hw_queue_depth=[0..qdepth]: Default: 64 The hardware queue depth of the device. +memory_backed=[0/1]: Default: 0 + Whether or not to use a memory buffer to respond to IO requests + + = ============================================= + 0 Transfer no data in response to IO requests + 1 Use a memory buffer to respond to IO requests + = ============================================= + +discard=[0/1]: Default: 0 + Support discard operations (requires memory-backed null_blk device). + + = ===================================== + 0 Do not support discard operations + 1 Enable support for discard operations + = ===================================== + +cache_size=[Size in MB]: Default: 0 + Cache size in MB for memory-backed device. + +mbps=[Maximum bandwidth in MB/s]: Default: 0 (no limit) + Bandwidth limit for device performance. + Multi-queue specific parameters ------------------------------- |