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authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2009-06-22 05:12:27 -0400
committerAlasdair G Kergon <agk@redhat.com>2009-06-22 05:12:27 -0400
commitfd5e033908b7b743b5650790f196761dd930f988 (patch)
treecd264d11371b9410e98388e00f4d87459a5e6325 /drivers/md/Kconfig
parent02ab823fd1a27d193bda06b74fdad685a20a3e5e (diff)
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 36e0675be9f7..3b311d273346 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -249,6 +249,15 @@ config DM_MULTIPATH
249 ---help--- 249 ---help---
250 Allow volume managers to support multipath hardware. 250 Allow volume managers to support multipath hardware.
251 251
252config DM_MULTIPATH_QL
253 tristate "I/O Path Selector based on the number of in-flight I/Os"
254 depends on DM_MULTIPATH
255 ---help---
256 This path selector is a dynamic load balancer which selects
257 the path with the least number of in-flight I/Os.
258
259 If unsure, say N.
260
252config DM_DELAY 261config DM_DELAY
253 tristate "I/O delaying target (EXPERIMENTAL)" 262 tristate "I/O delaying target (EXPERIMENTAL)"
254 depends on BLK_DEV_DM && EXPERIMENTAL 263 depends on BLK_DEV_DM && EXPERIMENTAL