blkio: Core implementation of throttle policy

o Actual implementation of throttling policy in block layer. Currently it
  implements READ and WRITE bytes per second throttling logic. IOPS throttling
  comes in later patches.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/block/Kconfig b/block/Kconfig
index 9be0b56eaee1..6c9213ef15a1 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -77,6 +77,18 @@ config BLK_DEV_INTEGRITY
         T10/SCSI Data Integrity Field or the T13/ATA External Path
         Protection.  If in doubt, say N.
 
+config BLK_DEV_THROTTLING
+        bool "Block layer bio throttling support"
+        depends on BLK_CGROUP=y && EXPERIMENTAL
+        default n
+        ---help---
+        Block layer bio throttling support. It can be used to limit
+        the IO rate to a device. IO rate policies are per cgroup and
+        one needs to mount and use blkio cgroup controller for creating
+        cgroups and specifying per device IO rate policies.
+
+        See Documentation/cgroups/blkio-controller.txt for more information.
+
 endif # BLOCK
 
 config BLOCK_COMPAT