blkio: Introduce per cfq group weights and vdisktime calculations

o Bring in the per cfq group weight and how vdisktime is calculated for the
  group. Also bring in the functionality of updating the min_vdisktime of
  the group service tree.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index be0280deec29..fa95fa770570 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -23,7 +23,6 @@ config IOSCHED_DEADLINE
 
 config IOSCHED_CFQ
         tristate "CFQ I/O scheduler"
-        select BLK_CGROUP
         default y
         ---help---
           The CFQ I/O scheduler tries to distribute bandwidth equally
@@ -33,6 +32,14 @@ config IOSCHED_CFQ
 
           This is the default I/O scheduler.
 
+config CFQ_GROUP_IOSCHED
+        bool "CFQ Group Scheduling support"
+        depends on IOSCHED_CFQ && CGROUPS
+        select BLK_CGROUP
+        default n
+        ---help---
+          Enable group IO scheduling in CFQ.
+
 choice
         prompt "Default I/O scheduler"
         default DEFAULT_CFQ