Merge branch 'for-2.6.37/core' of git://git.kernel.dk/linux-2.6-block

[net-next-2.6.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index be85a0ab1b822176b4c715266adfea779035af70..bd125a795374c5d6cab24569c4d5df7b7474790c 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -661,11 +661,14 @@ config BLK_CGROUP
 
        Currently, CFQ IO scheduler uses it to recognize task groups and
        control disk bandwidth allocation (proportional time slice allocation)
-       to such task groups.
+       to such task groups. It is also used by bio throttling logic in
+       block layer to implement upper limit in IO rates on a device.
 
        This option only enables generic Block IO controller infrastructure.
-       One needs to also enable actual IO controlling logic in CFQ for it
-       to take effect. (CONFIG_CFQ_GROUP_IOSCHED=y).
+       One needs to also enable actual IO controlling logic/policy. For
+       enabling proportional weight division of disk bandwidth in CFQ seti
+       CONFIG_CFQ_GROUP_IOSCHED=y and for enabling throttling policy set
+       CONFIG_BLK_THROTTLE=y.
 
        See Documentation/cgroups/blkio-controller.txt for more information.