blk-cgroup: config options re-arrangement

This patch fixes few usability and configurability issues.

o All the cgroup based controller options are configurable from
  "Genral Setup/Control Group Support/" menu. blkio is the only exception.
  Hence make this option visible in above menu and make it configurable from
  there to bring it inline with rest of the cgroup based controllers.

o Get rid of CONFIG_DEBUG_CFQ_IOSCHED.

  This option currently does two things.

  - Enable printing of cgroup paths in blktrace
  - Enables CONFIG_DEBUG_BLK_CGROUP, which in turn displays additional stat
    files in cgroup.

  If we are using group scheduling, blktrace data is of not really much use
  if cgroup information is not present. To get this data, currently one has to
  also enable CONFIG_DEBUG_CFQ_IOSCHED, which in turn brings the overhead of
  all the additional debug stat files which is not desired.

  Hence, this patch moves printing of cgroup paths under
  CONFIG_CFQ_GROUP_IOSCHED.

  This allows us to get rid of CONFIG_DEBUG_CFQ_IOSCHED completely. Now all
  the debug stat files are controlled only by CONFIG_DEBUG_BLK_CGROUP which
  can be enabled through config menu.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Divyesh Shah <dpshah@google.com>
Reviewed-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 0 insertions, 23 deletions

diff --git a/block/Kconfig b/block/Kconfig
index f9e89f4d94bb..9be0b56eaee1 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -77,29 +77,6 @@ config BLK_DEV_INTEGRITY
         T10/SCSI Data Integrity Field or the T13/ATA External Path
         Protection.  If in doubt, say N.
 
-config BLK_CGROUP
-        tristate "Block cgroup support"
-        depends on CGROUPS
-        depends on CFQ_GROUP_IOSCHED
-        default n
-        ---help---
-        Generic block IO controller cgroup interface. This is the common
-        cgroup interface which should be used by various IO controlling
-        policies.
-
-        Currently, CFQ IO scheduler uses it to recognize task groups and
-        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