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authorMike Snitzer <snitzer@redhat.com>2015-03-11 15:01:09 -0400
committerMike Snitzer <snitzer@redhat.com>2015-04-15 12:10:17 -0400
commit17e149b8f73ba116e71e25930dd6f2eb3828792d (patch)
tree6407112dbb113ffeebfd0620df27d4f67cd27ed1 /drivers/md/Kconfig
parent022333427a8aa4ccb318a9db90cea4e69ca1826b (diff)
downloadlinux-17e149b8f73ba116e71e25930dd6f2eb3828792d.tar.bz2
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/Kconfig11
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