From 17e149b8f73ba116e71e25930dd6f2eb3828792d Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Wed, 11 Mar 2015 15:01:09 -0400 Subject: 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 --- drivers/md/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/md/Kconfig') 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 -- cgit v1.2.3-55-g7522