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 b/block/Kconfig
index 6ba1a8e3388..e20fbde0875 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -90,6 +90,15 @@ config BLK_CGROUP
         control disk bandwidth allocation (proportional time slice allocation)
         to such task groups.
 
+config DEBUG_BLK_CGROUP
+        bool
+        depends on BLK_CGROUP
+        default n
+        ---help---
+        Enable some debugging help. Currently it stores the cgroup path
+        in the blk group which can be used by cfq for tracing various
+        group related activity.
+
 endif # BLOCK
 
 config BLOCK_COMPAT