summaryrefslogtreecommitdiffstats
path: root/drivers/md/Kconfig
diff options
context:
space:
mode:
authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2009-06-22 10:12:27 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-06-22 10:12:27 +0100
commitfd5e033908b7b743b5650790f196761dd930f988 (patch)
treecd264d11371b9410e98388e00f4d87459a5e6325 /drivers/md/Kconfig
parent02ab823fd1a27d193bda06b74fdad685a20a3e5e (diff)
downloadop-kernel-dev-fd5e033908b7b743b5650790f196761dd930f988.zip
op-kernel-dev-fd5e033908b7b743b5650790f196761dd930f988.tar.gz
dm mpath: add queue length load balancer
This patch adds a dynamic load balancer, dm-queue-length, which balances the number of in-flight I/Os across the paths. The code is based on the patch posted by Stefan Bader: https://www.redhat.com/archives/dm-devel/2005-October/msg00050.html Signed-off-by: Stefan Bader <stefan.bader@canonical.com> Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/Kconfig')
-rw-r--r--drivers/md/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 36e0675..3b311d2 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -249,6 +249,15 @@ config DM_MULTIPATH
---help---
Allow volume managers to support multipath hardware.
+config DM_MULTIPATH_QL
+ tristate "I/O Path Selector based on the number of in-flight I/Os"
+ depends on DM_MULTIPATH
+ ---help---
+ This path selector is a dynamic load balancer which selects
+ the path with the least number of in-flight I/Os.
+
+ If unsure, say N.
+
config DM_DELAY
tristate "I/O delaying target (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
OpenPOWER on IntegriCloud