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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 <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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