/* SPDX-License-Identifier: GPL-2.0 */
  /*
   * Only give sleepers 50% of their service deficit. This allows
   * them to run sooner, but does not allow tons of sleepers to
   * rip the spread apart.
   */
  SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true)
  
  /*
   * Place new tasks ahead so that they do not starve already running
   * tasks
   */
  SCHED_FEAT(START_DEBIT, true)
  
  /*
   * Prefer to schedule the task we woke last (assuming it failed
   * wakeup-preemption), since its likely going to consume data we
   * touched, increases cache locality.
   */
  SCHED_FEAT(NEXT_BUDDY, false)
  
  /*
   * Prefer to schedule the task that ran last (when we did
   * wake-preempt) as that likely will touch the same data, increases
   * cache locality.
   */
  SCHED_FEAT(LAST_BUDDY, true)
  
  /*
   * Consider buddies to be cache hot, decreases the likelyness of a
   * cache buddy being migrated away, increases cache locality.
   */
  SCHED_FEAT(CACHE_HOT_BUDDY, true)
  
  /*
   * Allow wakeup-time preemption of the current task:
   */
  SCHED_FEAT(WAKEUP_PREEMPTION, true)
  
  SCHED_FEAT(HRTICK, false)
  SCHED_FEAT(DOUBLE_TICK, false)
  SCHED_FEAT(LB_BIAS, true)
  
  /*
   * Decrement CPU capacity based on time not spent running tasks
   */
  SCHED_FEAT(NONTASK_CAPACITY, true)
  
  /*
   * Queue remote wakeups on the target CPU and process them
   * using the scheduler IPI. Reduces rq->lock contention/bounces.
   */
  SCHED_FEAT(TTWU_QUEUE, true)
  
  /*
   * When doing wakeups, attempt to limit superfluous scans of the LLC domain.
   */
  SCHED_FEAT(SIS_AVG_CPU, false)
  SCHED_FEAT(SIS_PROP, true)
  
  /*
   * Issue a WARN when we do multiple update_rq_clock() calls
   * in a single rq->lock section. Default disabled because the
   * annotations are not complete.
   */
  SCHED_FEAT(WARN_DOUBLE_CLOCK, false)
  
  #ifdef HAVE_RT_PUSH_IPI
  /*
   * In order to avoid a thundering herd attack of CPUs that are
   * lowering their priorities at the same time, and there being
   * a single CPU that has an RT task that can migrate and is waiting
   * to run, where the other CPUs will try to take that CPUs
   * rq lock and possibly create a large contention, sending an
   * IPI to that CPU and let that CPU push the RT task to where
   * it should go may be a better scenario.
   */
  SCHED_FEAT(RT_PUSH_IPI, true)
  #endif
  
  SCHED_FEAT(RT_RUNTIME_SHARE, true)
  SCHED_FEAT(LB_MIN, false)
  SCHED_FEAT(ATTACH_AGE_LOAD, true)
  
  SCHED_FEAT(WA_IDLE, true)
  SCHED_FEAT(WA_WEIGHT, true)
  SCHED_FEAT(WA_BIAS, true)
  
  /*
   * UtilEstimation. Use estimated CPU utilization.
   */
  SCHED_FEAT(UTIL_EST, true)
  
  /*
   * Energy aware scheduling. Use platform energy model to guide scheduling
   * decisions optimizing for energy efficiency.
   */
  #ifdef CONFIG_DEFAULT_USE_ENERGY_AWARE
  SCHED_FEAT(ENERGY_AWARE, true)
  #else
  SCHED_FEAT(ENERGY_AWARE, false)
  #endif
  
  /*
   * Energy aware scheduling algorithm choices:
   * EAS_PREFER_IDLE
   *   Direct tasks in a schedtune.prefer_idle=1 group through
   *   the EAS path for wakeup task placement. Otherwise, put
   *   those tasks through the mainline slow path.
   * FIND_BEST_TARGET
   *   Limit the number of placement options for which we calculate
   *   energy by using heuristics to select 'best idle' and
   *   'best active' cpu options.
   * FBT_STRICT_ORDER
   *   ON: If the target CPU saves any energy, use that.
   *   OFF: Use whichever of target or backup saves most.
   */
  SCHED_FEAT(EAS_PREFER_IDLE, true)
  SCHED_FEAT(FIND_BEST_TARGET, true)
  SCHED_FEAT(FBT_STRICT_ORDER, true)
  
  /*
   * Apply schedtune boost hold to tasks of all sched classes.
   * If enabled, schedtune will hold the boost applied to a CPU
   * for 50ms regardless of task activation - if the task is
   * still running 50ms later, the boost hold expires and schedtune
   * boost will expire immediately the task stops.
   * If disabled, this behaviour will only apply to tasks of the
   * RT class.
   */
  SCHED_FEAT(SCHEDTUNE_BOOST_HOLD_ALL, false)