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- This document gives a brief rationale for the TREE_RCU-related test
- cases, a group that includes PREEMPT_RCU.
- Kconfig Parameters:
- CONFIG_DEBUG_LOCK_ALLOC -- Do three, covering CONFIG_PROVE_LOCKING & not.
- CONFIG_DEBUG_OBJECTS_RCU_HEAD -- Do one.
- CONFIG_HOTPLUG_CPU -- Do half. (Every second.)
- CONFIG_HZ_PERIODIC -- Do one.
- CONFIG_NO_HZ_IDLE -- Do those not otherwise specified. (Groups of two.)
- CONFIG_NO_HZ_FULL -- Do two, one with partial CPU enablement.
- CONFIG_PREEMPT -- Do half. (First three and #8.)
- CONFIG_PROVE_LOCKING -- Do several, covering CONFIG_DEBUG_LOCK_ALLOC=y and not.
- CONFIG_PROVE_RCU -- Hardwired to CONFIG_PROVE_LOCKING.
- CONFIG_RCU_BOOST -- one of PREEMPT_RCU.
- CONFIG_RCU_FANOUT -- Cover hierarchy, but overlap with others.
- CONFIG_RCU_FANOUT_LEAF -- Do one non-default.
- CONFIG_RCU_FAST_NO_HZ -- Do one, but not with all nohz_full CPUs.
- CONFIG_RCU_NOCB_CPU -- Do three, one with no rcu_nocbs CPUs, one with
- rcu_nocbs=0, and one with all rcu_nocbs CPUs.
- CONFIG_RCU_TRACE -- Do half.
- CONFIG_SMP -- Need one !SMP for PREEMPT_RCU.
- CONFIG_RCU_EXPERT=n -- Do a few, but these have to be vanilla configurations.
- CONFIG_RCU_EQS_DEBUG -- Do at least one for CONFIG_NO_HZ_FULL and not.
- RCU-bh: Do one with PREEMPT and one with !PREEMPT.
- RCU-sched: Do one with PREEMPT but not BOOST.
- Boot parameters:
- nohz_full - do at least one.
- maxcpu -- do at least one.
- rcupdate.rcu_self_test_bh -- Do at least one each, offloaded and not.
- rcupdate.rcu_self_test_sched -- Do at least one each, offloaded and not.
- rcupdate.rcu_self_test -- Do at least one each, offloaded and not.
- rcutree.rcu_fanout_exact -- Do at least one.
- Kconfig Parameters Ignored:
- CONFIG_64BIT
- Used only to check CONFIG_RCU_FANOUT value, inspection suffices.
- CONFIG_PREEMPT_COUNT
- CONFIG_PREEMPT_RCU
- Redundant with CONFIG_PREEMPT, ignore.
- CONFIG_RCU_BOOST_DELAY
- Inspection suffices, ignore.
- CONFIG_RCU_CPU_STALL_TIMEOUT
- Inspection suffices, ignore.
- CONFIG_RCU_STALL_COMMON
- Implied by TREE_RCU and PREEMPT_RCU.
- CONFIG_RCU_TORTURE_TEST
- CONFIG_RCU_TORTURE_TEST_RUNNABLE
- Always used in KVM testing.
- CONFIG_PREEMPT_RCU
- CONFIG_TREE_RCU
- CONFIG_TINY_RCU
- CONFIG_TASKS_RCU
- These are controlled by CONFIG_PREEMPT and/or CONFIG_SMP.
- CONFIG_SRCU
- Selected by CONFIG_RCU_TORTURE_TEST, so cannot disable.
- boot parameters ignored: TBD
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