[PATCH V4 02/16] block, bfq: add full hierarchical scheduling and cgroups support

From: Arianna Avanzini Add complete support for full hierarchical scheduling, with a cgroups interface. Full hierarchical scheduling is implemented through the 'entity' abstraction: both bfq_queues, i.e., the internal BFQ queues associated with processes, and groups

[PATCH V4 02/16] block, bfq: add full hierarchical scheduling and cgroups support

From: Arianna Avanzini Add complete support for full hierarchical scheduling, with a cgroups interface. Full hierarchical scheduling is implemented through the 'entity' abstraction: both bfq_queues, i.e., the internal BFQ queues associated with processes, and groups are represented in general by