tree 860b74f8134cfbd516cc73b8b9a9edfe4e3d2db6
parent bf7919371025412978268efca4b09dd847acb395
author Vivek Goyal <vgoyal@redhat.com> 1259863178 -0500
committer Jens Axboe <jens.axboe@oracle.com> 1259864931 +0100

blkio: Introduce the notion of cfq groups

o This patch introduce the notion of cfq groups. Soon we will can have multiple
  groups of different weights in the system.

o Various service trees (prioclass and workload type trees), will become per
  cfq group. So hierarchy looks as follows.

			cfq_groups
			   |
			workload type
			   |
		        cfq queue

o When an scheduling decision has to be taken, first we select the cfq group
  then workload with-in the group and then cfq queue with-in the workload
  type.

o This patch just makes various workload service tree per cfq group and
  introduce the function to be able to choose a group for scheduling.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>