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| author | Mike Snitzer | 2015-03-11 20:01:09 +0100 |
|---|---|---|
| committer | Mike Snitzer | 2015-04-15 18:10:17 +0200 |
| commit | 17e149b8f73ba116e71e25930dd6f2eb3828792d (patch) | |
| tree | 6407112dbb113ffeebfd0620df27d4f67cd27ed1 /drivers/md/Kconfig | |
| parent | dm: optimize dm_mq_queue_rq to _not_ use kthread if using pure blk-mq (diff) | |
| download | kernel-qcow2-linux-17e149b8f73ba116e71e25930dd6f2eb3828792d.tar.gz kernel-qcow2-linux-17e149b8f73ba116e71e25930dd6f2eb3828792d.tar.xz kernel-qcow2-linux-17e149b8f73ba116e71e25930dd6f2eb3828792d.zip | |
dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr
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>
Diffstat (limited to 'drivers/md/Kconfig')
| -rw-r--r-- | drivers/md/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 63e05e32b462..109f9dcc9cab 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -196,6 +196,17 @@ config BLK_DEV_DM If unsure, say N. +config DM_MQ_DEFAULT + bool "request-based DM: use blk-mq I/O path by default" + depends on BLK_DEV_DM + ---help--- + This option enables the blk-mq based I/O path for request-based + DM devices by default. With the option the dm_mod.use_blk_mq + module/boot option defaults to Y, without it to N, but it can + still be overriden either way. + + If unsure say N. + config DM_DEBUG bool "Device mapper debugging support" depends on BLK_DEV_DM |