CFQ Group Scheduling support

configname: CONFIG_CFQ_GROUP_IOSCHED

Linux Kernel Configuration
└─>Enable the block layer
└─>IO Schedulers
└─>CFQ Group Scheduling support
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Enable group IO scheduling in CFQ.

depends
CONFIG_BLK_CGROUP
CONFIG_BLOCK
CONFIG_IOSCHED_CFQ