mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
17e149b8f7
Request-based DM's blk-mq support defaults to off; but a user can easily change the default using the dm_mod.use_blk_mq module/boot option. Also, you can check what mode a given request-based DM device is using with: cat /sys/block/dm-X/dm/use_blk_mq This change enabled further cleanup and reduced work (e.g. the md->io_pool and md->rq_pool isn't created if using blk-mq). Signed-off-by: Mike Snitzer <snitzer@redhat.com>
48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
What: /sys/block/dm-<num>/dm/name
|
|
Date: January 2009
|
|
KernelVersion: 2.6.29
|
|
Contact: dm-devel@redhat.com
|
|
Description: Device-mapper device name.
|
|
Read-only string containing mapped device name.
|
|
Users: util-linux, device-mapper udev rules
|
|
|
|
What: /sys/block/dm-<num>/dm/uuid
|
|
Date: January 2009
|
|
KernelVersion: 2.6.29
|
|
Contact: dm-devel@redhat.com
|
|
Description: Device-mapper device UUID.
|
|
Read-only string containing DM-UUID or empty string
|
|
if DM-UUID is not set.
|
|
Users: util-linux, device-mapper udev rules
|
|
|
|
What: /sys/block/dm-<num>/dm/suspended
|
|
Date: June 2009
|
|
KernelVersion: 2.6.31
|
|
Contact: dm-devel@redhat.com
|
|
Description: Device-mapper device suspend state.
|
|
Contains the value 1 while the device is suspended.
|
|
Otherwise it contains 0. Read-only attribute.
|
|
Users: util-linux, device-mapper udev rules
|
|
|
|
What: /sys/block/dm-<num>/dm/rq_based_seq_io_merge_deadline
|
|
Date: March 2015
|
|
KernelVersion: 4.1
|
|
Contact: dm-devel@redhat.com
|
|
Description: Allow control over how long a request that is a
|
|
reasonable merge candidate can be queued on the request
|
|
queue. The resolution of this deadline is in
|
|
microseconds (ranging from 1 to 100000 usecs).
|
|
Setting this attribute to 0 (the default) will disable
|
|
request-based DM's merge heuristic and associated extra
|
|
accounting. This attribute is not applicable to
|
|
bio-based DM devices so it will only ever report 0 for
|
|
them.
|
|
|
|
What: /sys/block/dm-<num>/dm/use_blk_mq
|
|
Date: March 2015
|
|
KernelVersion: 4.1
|
|
Contact: dm-devel@redhat.com
|
|
Description: Request-based Device-mapper blk-mq I/O path mode.
|
|
Contains the value 1 if the device is using blk-mq.
|
|
Otherwise it contains 0. Read-only attribute.
|