blkio: Some debugging aids for CFQ

o Some debugging aids for CFQ.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index fa95fa770570..b71abfb0d726 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -40,6 +40,15 @@ config CFQ_GROUP_IOSCHED
         ---help---
           Enable group IO scheduling in CFQ.
 
+config DEBUG_CFQ_IOSCHED
+        bool "Debug CFQ Scheduling"
+        depends on CFQ_GROUP_IOSCHED
+        select DEBUG_BLK_CGROUP
+        default n
+        ---help---
+          Enable CFQ IO scheduling debugging in CFQ. Currently it makes
+          blktrace output more verbose.
+
 choice
         prompt "Default I/O scheduler"
         default DEFAULT_CFQ