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kernel
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sched
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features.h

features.h 2.1 KB
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  1. /*
    2. 

  2.  * Only give sleepers 50% of their service deficit. This allows
    3. 

  3.  * them to run sooner, but does not allow tons of sleepers to
    4. 

  4.  * rip the spread apart.
    5. 

  5.  */
    6. 

  6. SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true)
    7. 

  7. 

  8. /*
    9. 

  9.  * Place new tasks ahead so that they do not starve already running
    10. 

  10.  * tasks
    11. 

  11.  */
    12. 

  12. SCHED_FEAT(START_DEBIT, true)
    13. 

  13. 

  14. /*
    15. 

  15.  * Prefer to schedule the task we woke last (assuming it failed
    16. 

  16.  * wakeup-preemption), since its likely going to consume data we
    17. 

  17.  * touched, increases cache locality.
    18. 

  18.  */
    19. 

  19. SCHED_FEAT(NEXT_BUDDY, false)
    20. 

  20. 

  21. /*
    22. 

  22.  * Prefer to schedule the task that ran last (when we did
    23. 

  23.  * wake-preempt) as that likely will touch the same data, increases
    24. 

  24.  * cache locality.
    25. 

  25.  */
    26. 

  26. SCHED_FEAT(LAST_BUDDY, true)
    27. 

  27. 

  28. /*
    29. 

  29.  * Consider buddies to be cache hot, decreases the likelyness of a
    30. 

  30.  * cache buddy being migrated away, increases cache locality.
    31. 

  31.  */
    32. 

  32. SCHED_FEAT(CACHE_HOT_BUDDY, true)
    33. 

  33. 

  34. /*
    35. 

  35.  * Allow wakeup-time preemption of the current task:
    36. 

  36.  */
    37. 

  37. SCHED_FEAT(WAKEUP_PREEMPTION, true)
    38. 

  38. 

  39. /*
    40. 

  40.  * Use arch dependent cpu power functions
    41. 

  41.  */
    42. 

  42. SCHED_FEAT(ARCH_POWER, true)
    43. 

  43. 

  44. SCHED_FEAT(HRTICK, false)
    45. 

  45. SCHED_FEAT(DOUBLE_TICK, false)
    46. 

  46. SCHED_FEAT(LB_BIAS, true)
    47. 

  47. 

  48. /*
    49. 

  49.  * Decrement CPU power based on time not spent running tasks
    50. 

  50.  */
    51. 

  51. SCHED_FEAT(NONTASK_POWER, true)
    52. 

  52. 

  53. /*
    54. 

  54.  * Queue remote wakeups on the target CPU and process them
    55. 

  55.  * using the scheduler IPI. Reduces rq->lock contention/bounces.
    56. 

  56.  */
    57. 

  57. SCHED_FEAT(TTWU_QUEUE, true)
    58. 

  58. 

  59. SCHED_FEAT(FORCE_SD_OVERLAP, false)
    60. 

  60. SCHED_FEAT(RT_RUNTIME_SHARE, true)
    61. 

  61. SCHED_FEAT(LB_MIN, false)
    62. 

  62. 

  63. /*
    64. 

  64.  * Apply the automatic NUMA scheduling policy. Enabled automatically
    65. 

  65.  * at runtime if running on a NUMA machine. Can be controlled via
    66. 

  66.  * numa_balancing=
    67. 

  67.  */
    68. 

  68. #ifdef CONFIG_NUMA_BALANCING
    69. 

  69. SCHED_FEAT(NUMA,	false)
    70. 

  70. 

  71. /*
    72. 

  72.  * NUMA_FAVOUR_HIGHER will favor moving tasks towards nodes where a
    73. 

  73.  * higher number of hinting faults are recorded during active load
    74. 

  74.  * balancing.
    75. 

  75.  */
    76. 

  76. SCHED_FEAT(NUMA_FAVOUR_HIGHER, true)
    77. 

  77. 

  78. /*
    79. 

  79.  * NUMA_RESIST_LOWER will resist moving tasks towards nodes where a
    80. 

  80.  * lower number of hinting faults have been recorded. As this has
    81. 

  81.  * the potential to prevent a task ever migrating to a new node
    82. 

  82.  * due to CPU overload it is disabled by default.
    83. 

  83.  */
    84. 

  84. SCHED_FEAT(NUMA_RESIST_LOWER, false)
    85. 

  85. #endif
    86.