7e42776d5e
The actual use of TASKS_RCU is only when PREEMPT, otherwise RCU-sched is used instead. This commit therefore makes synchronize_rcu_tasks() and call_rcu_tasks() available always, but mapped to synchronize_sched() and call_rcu_sched(), respectively, when !PREEMPT. This approach also allows some #ifdefs to be removed from rcutorture. Reported-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org>
82 lines
2.3 KiB
Plaintext
82 lines
2.3 KiB
Plaintext
This document gives a brief rationale for the TREE_RCU-related test
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cases, a group that includes PREEMPT_RCU.
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Kconfig Parameters:
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CONFIG_DEBUG_LOCK_ALLOC -- Do three, covering CONFIG_PROVE_LOCKING & not.
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CONFIG_DEBUG_OBJECTS_RCU_HEAD -- Do one.
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CONFIG_HOTPLUG_CPU -- Do half. (Every second.)
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CONFIG_HZ_PERIODIC -- Do one.
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CONFIG_NO_HZ_IDLE -- Do those not otherwise specified. (Groups of two.)
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CONFIG_NO_HZ_FULL -- Do two, one with partial CPU enablement.
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CONFIG_PREEMPT -- Do half. (First three and #8.)
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CONFIG_PROVE_LOCKING -- Do several, covering CONFIG_DEBUG_LOCK_ALLOC=y and not.
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CONFIG_PROVE_RCU -- Hardwired to CONFIG_PROVE_LOCKING.
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CONFIG_RCU_BOOST -- one of PREEMPT_RCU.
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CONFIG_RCU_FANOUT -- Cover hierarchy, but overlap with others.
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CONFIG_RCU_FANOUT_LEAF -- Do one non-default.
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CONFIG_RCU_FAST_NO_HZ -- Do one, but not with all nohz_full CPUs.
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CONFIG_RCU_NOCB_CPU -- Do three, one with no rcu_nocbs CPUs, one with
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rcu_nocbs=0, and one with all rcu_nocbs CPUs.
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CONFIG_RCU_TRACE -- Do half.
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CONFIG_SMP -- Need one !SMP for PREEMPT_RCU.
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CONFIG_RCU_EXPERT=n -- Do a few, but these have to be vanilla configurations.
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CONFIG_RCU_EQS_DEBUG -- Do at least one for CONFIG_NO_HZ_FULL and not.
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RCU-bh: Do one with PREEMPT and one with !PREEMPT.
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RCU-sched: Do one with PREEMPT but not BOOST.
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Boot parameters:
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nohz_full - do at least one.
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maxcpu -- do at least one.
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rcupdate.rcu_self_test_bh -- Do at least one each, offloaded and not.
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rcupdate.rcu_self_test_sched -- Do at least one each, offloaded and not.
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rcupdate.rcu_self_test -- Do at least one each, offloaded and not.
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rcutree.rcu_fanout_exact -- Do at least one.
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Kconfig Parameters Ignored:
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CONFIG_64BIT
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Used only to check CONFIG_RCU_FANOUT value, inspection suffices.
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CONFIG_PREEMPT_COUNT
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CONFIG_PREEMPT_RCU
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Redundant with CONFIG_PREEMPT, ignore.
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CONFIG_RCU_BOOST_DELAY
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Inspection suffices, ignore.
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CONFIG_RCU_CPU_STALL_TIMEOUT
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Inspection suffices, ignore.
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CONFIG_RCU_STALL_COMMON
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Implied by TREE_RCU and PREEMPT_RCU.
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CONFIG_RCU_TORTURE_TEST
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CONFIG_RCU_TORTURE_TEST_RUNNABLE
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Always used in KVM testing.
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CONFIG_PREEMPT_RCU
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CONFIG_TREE_RCU
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CONFIG_TINY_RCU
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CONFIG_TASKS_RCU
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These are controlled by CONFIG_PREEMPT and/or CONFIG_SMP.
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CONFIG_SRCU
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Selected by CONFIG_RCU_TORTURE_TEST, so cannot disable.
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boot parameters ignored: TBD
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