TREE_RCU-kconfig.txt 2.4 KB

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  1. This document gives a brief rationale for the TREE_RCU-related test
  2. cases, a group that includes PREEMPT_RCU.
  3. Kconfig Parameters:
  4. CONFIG_DEBUG_LOCK_ALLOC -- Do three, covering CONFIG_PROVE_LOCKING & not.
  5. CONFIG_DEBUG_OBJECTS_RCU_HEAD -- Do one.
  6. CONFIG_HOTPLUG_CPU -- Do half. (Every second.)
  7. CONFIG_HZ_PERIODIC -- Do one.
  8. CONFIG_NO_HZ_IDLE -- Do those not otherwise specified. (Groups of two.)
  9. CONFIG_NO_HZ_FULL -- Do two, one with CONFIG_NO_HZ_FULL_SYSIDLE.
  10. CONFIG_NO_HZ_FULL_SYSIDLE -- Do one.
  11. CONFIG_PREEMPT -- Do half. (First three and #8.)
  12. CONFIG_PROVE_LOCKING -- Do several, covering CONFIG_DEBUG_LOCK_ALLOC=y and not.
  13. CONFIG_PROVE_RCU -- Hardwired to CONFIG_PROVE_LOCKING.
  14. CONFIG_RCU_BOOST -- one of PREEMPT_RCU.
  15. CONFIG_RCU_KTHREAD_PRIO -- set to 2 for _BOOST testing.
  16. CONFIG_RCU_CPU_STALL_INFO -- Now default, avoid at least twice.
  17. CONFIG_RCU_FANOUT -- Cover hierarchy, but overlap with others.
  18. CONFIG_RCU_FANOUT_LEAF -- Do one non-default.
  19. CONFIG_RCU_FAST_NO_HZ -- Do one, but not with CONFIG_RCU_NOCB_CPU_ALL.
  20. CONFIG_RCU_NOCB_CPU -- Do three, see below.
  21. CONFIG_RCU_NOCB_CPU_ALL -- Do one.
  22. CONFIG_RCU_NOCB_CPU_NONE -- Do one.
  23. CONFIG_RCU_NOCB_CPU_ZERO -- Do one.
  24. CONFIG_RCU_TRACE -- Do half.
  25. CONFIG_SMP -- Need one !SMP for PREEMPT_RCU.
  26. !RCU_EXPERT -- Do a few, but these have to be vanilla configurations.
  27. RCU-bh: Do one with PREEMPT and one with !PREEMPT.
  28. RCU-sched: Do one with PREEMPT but not BOOST.
  29. Boot parameters:
  30. nohz_full - do at least one.
  31. maxcpu -- do at least one.
  32. rcupdate.rcu_self_test_bh -- Do at least one each, offloaded and not.
  33. rcupdate.rcu_self_test_sched -- Do at least one each, offloaded and not.
  34. rcupdate.rcu_self_test -- Do at least one each, offloaded and not.
  35. rcutree.rcu_fanout_exact -- Do at least one.
  36. Kconfig Parameters Ignored:
  37. CONFIG_64BIT
  38. Used only to check CONFIG_RCU_FANOUT value, inspection suffices.
  39. CONFIG_NO_HZ_FULL_SYSIDLE_SMALL
  40. Defer until Frederic uses this.
  41. CONFIG_PREEMPT_COUNT
  42. CONFIG_PREEMPT_RCU
  43. Redundant with CONFIG_PREEMPT, ignore.
  44. CONFIG_RCU_BOOST_DELAY
  45. Inspection suffices, ignore.
  46. CONFIG_RCU_CPU_STALL_TIMEOUT
  47. Inspection suffices, ignore.
  48. CONFIG_RCU_STALL_COMMON
  49. Implied by TREE_RCU and PREEMPT_RCU.
  50. CONFIG_RCU_TORTURE_TEST
  51. CONFIG_RCU_TORTURE_TEST_RUNNABLE
  52. Always used in KVM testing.
  53. CONFIG_RCU_USER_QS
  54. Redundant with CONFIG_NO_HZ_FULL.
  55. CONFIG_PREEMPT_RCU
  56. CONFIG_TREE_RCU
  57. These are controlled by CONFIG_PREEMPT.