Merge tag 'sched-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:
 "Load-balancing updates:

   - 'flatten the pick': improve cgroup scheduling, which has always
     been problematic and painful, which has caused various scheduling
     misbehavior such as the mishandling of reniced tasks et al.

     Add various cgroup weight distribution methods via cgroup_mode:
     'up', 'max', 'concur' and 'tasks' - with the default being 'concur'
     which is the most precise yet also most expensive version.

     Finally, change cgroup scheduling to a single runqueue (Peter
     Zijlstra)

   - Series to improve the scheduling latency of short slice tasks
     (Vincent Guittot)

   - Series to fix cluster scheduling in the presence of asymmetric
     capacity (Ricardo Neri)

   - Prefer fully idle cores for NOHZ balancing (Andrea Righi)

   - Don't trigger active load-balancing if src_rq->curr is not on_rq
     (Xin Zhao)

  PSI updates:

   - Skip irqtime accounting when no new irq time has elapsed (Usama
     Arif)

  Scheduler debugging updates:

   - Remove unused schedstats (Shrikanth Hegde)

   - Defer freeing of cpumask memblock memory to initcall (Waiman Long)

  Misc fixes and updates by Yu C Chen, K Prateek Nayak, Peter Zijlstra,
  Vincent Guittot, Xin Zhao, Yury Norov, Zhan Xusheng"

* tag 'sched-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (33 commits)
  sched/fair: Fix flat hierarchy
  sched/isolation: Defer freeing of cpumask memblock memory to initcall
  sched/topology: Restore SD_PREFER_SIBLING in domains with asymmetric capacity
  sched/fair: Allow load balancing between CPUs of identical capacity
  sched/fair: Skip misfit load accounting when the destination CPU cannot help
  sched/fair: Check CPU capacity before comparing group types during load balance
  sched/fair: Also gate overloaded status update for SD_ASYM_CPUCAPACITY
  sched/fair: Do not skip CPUs of similar capacity with busy SMT siblings
  sched/fair: Prefer fully idle cores for NOHZ balancing
  stop_machine: Make stop_one_cpu_nowait() return void
  sched/eevdf: Delayed dequeue task can't preempt
  sched/fair: Fix stale comments referring to removed CFS concepts
  sched/debug: Remove unused schedstats
  sched/psi: skip irqtime accounting when no new irq time has elapsed
  sched/fair: Reflow sched_balance_rq()
  sched/fair: Simplify balance_interval reset logic in sched_balance_rq()
  sched/fair: Don't trigger active lb if src_rq->curr is not on_rq
  sched/eevdf: Speedup short slice task scheduling
  sched/eevdf: Always update slice protection
  sched/eevdf: Cancel slice protection if short slice task is eligible
  ...

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