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- Update the blkio cgroup to support the BFQ I/O Scheduler, that has replaced CFQ in the Linux kernel. - BFQ is controlled through blkio.bfq.weight[_device] instead of CFQ's blkio.weight[_device] in cgroups v1. - BFQ does not support blkio.leaf_weight[_device], so that behavior remains untouched. - Do not change behavior on legacy CFQ systems. - Enable using blkio weights on BFQ systems. Signed-off-by: Antti Kervinen <antti.kervinen@intel.com>