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1This document gives a brief rationale for the TREE_RCU-related test2cases, a group that includes PREEMPT_RCU.3 4 5Kconfig Parameters:6 7CONFIG_DEBUG_LOCK_ALLOC -- Do three, covering CONFIG_PROVE_LOCKING & not.8CONFIG_DEBUG_OBJECTS_RCU_HEAD -- Do one.9CONFIG_HZ_PERIODIC -- Do one.10CONFIG_NO_HZ_IDLE -- Do those not otherwise specified. (Groups of two.)11CONFIG_NO_HZ_FULL -- Do two, one with partial CPU enablement.12CONFIG_PREEMPT -- Do half. (First three and #8.)13CONFIG_PROVE_LOCKING -- Do several, covering CONFIG_DEBUG_LOCK_ALLOC=y and not.14CONFIG_PROVE_RCU -- Hardwired to CONFIG_PROVE_LOCKING.15CONFIG_RCU_BOOST -- one of PREEMPT_RCU.16CONFIG_RCU_FANOUT -- Cover hierarchy, but overlap with others.17CONFIG_RCU_FANOUT_LEAF -- Do one non-default.18CONFIG_RCU_NOCB_CPU -- Do three, one with no rcu_nocbs CPUs, one with19 rcu_nocbs=0, and one with all rcu_nocbs CPUs.20CONFIG_RCU_TRACE -- Do half.21CONFIG_SMP -- Need one !SMP for PREEMPT_RCU.22CONFIG_RCU_EXPERT=n -- Do a few, but these have to be vanilla configurations.23CONFIG_RCU_EQS_DEBUG -- Do at least one for CONFIG_NO_HZ_FULL and not.24 25RCU-bh: Do one with PREEMPT and one with !PREEMPT.26RCU-sched: Do one with PREEMPT but not BOOST.27 28 29Boot parameters:30 31nohz_full - do at least one.32maxcpu -- do at least one.33rcupdate.rcu_self_test_bh -- Do at least one each, offloaded and not.34rcupdate.rcu_self_test_sched -- Do at least one each, offloaded and not.35rcupdate.rcu_self_test -- Do at least one each, offloaded and not.36rcutree.rcu_fanout_exact -- Do at least one.37 38 39Kconfig Parameters Ignored:40 41CONFIG_64BIT42 43 Used only to check CONFIG_RCU_FANOUT value, inspection suffices.44 45CONFIG_PREEMPT_COUNT46CONFIG_PREEMPT_RCU47 48 Redundant with CONFIG_PREEMPT, ignore.49 50CONFIG_RCU_BOOST_DELAY51 52 Inspection suffices, ignore.53 54CONFIG_RCU_CPU_STALL_TIMEOUT55 56 Inspection suffices, ignore.57 58CONFIG_RCU_STALL_COMMON59 60 Implied by TREE_RCU and PREEMPT_RCU.61 62CONFIG_RCU_TORTURE_TEST63CONFIG_RCU_TORTURE_TEST_RUNNABLE64 65 Always used in KVM testing.66 67CONFIG_PREEMPT_RCU68CONFIG_TREE_RCU69CONFIG_TINY_RCU70CONFIG_TASKS_RCU71 72 These are controlled by CONFIG_PREEMPT and/or CONFIG_SMP.73 74 75boot parameters ignored: TBD76