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Sub-schedulers don't get cgroups yet: every task_group is inited on the root sched and the routing added by the previous patches always resolves to it. Add the handover: an enabling sub-scheduler takes over the cgroups in its subtree and a disabling one returns them to its parent. scx_cgroup_claim_subtree() runs while the sub enables, after the subtree's cgrp->scx_sched's are set and before any task is claimed. It inits each subtree task_group on the sub, exits it from the parent and updates tg->scx.sched. A failed ops.cgroup_init() unwinds the sub-side inits and aborts the enable with the parent untouched. Disabling reverses it with scx_cgroup_return_subtree(): exit each cgroup from the sub, then re-init it on the parent with the current tg->scx.* values, resyncing weight and bandwidth changes made while the sub had it. When a re-init fails, the parent is failed and the remaining task_groups still transfer uninited and get no cgroup ops - the same punting done for tasks. The dying parent's own disable moves them onward. The handover walks include dying but not yet offlined task_groups, the same as root's bulk walks: a removed cgroup keeps hosting scheduling events until its dying tasks finish their final context switches, and its ops.cgroup_exit() must follow the last of them. tg on/offlining is excluded through cgroup_lock(), so either ordering against an rmdir of a subtree cgroup delivers balanced init/exit pairs. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Andrea Righi <arighi@nvidia.com> |
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