From: Fabio Checconi <[email protected]>

Add the CGROUP_BFQIO option to Kconfig.iosched. This option allows
full hierarchical support to be enabled in BFQ, and the bfqio
controller to be added to the cgroups interface.

Signed-off-by: Fabio Checconi <[email protected]>
Signed-off-by: Paolo Valente <[email protected]>
Signed-off-by: Arianna Avanzini <[email protected]>
---
 block/Kconfig.iosched | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 8f98cc7..a3675cb 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -46,7 +46,18 @@ config IOSCHED_BFQ
          The BFQ I/O scheduler tries to distribute bandwidth among all
          processes according to their weights.
          It aims at distributing the bandwidth as desired, regardless
-         of the disk parameters and with any workload.
+         of the disk parameters and with any workload. If compiled
+         built-in (saying Y here), BFQ can be configured to support
+         hierarchical scheduling.
+
+config CGROUP_BFQIO
+       bool "BFQ hierarchical scheduling support"
+       depends on CGROUPS && IOSCHED_BFQ=y
+       default n
+       ---help---
+         Enable hierarchical scheduling in BFQ, using the cgroups
+         filesystem interface.  The name of the subsystem will be
+         bfqio.
 
 choice
        prompt "Default I/O scheduler"
-- 
1.9.2

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