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This document gives a brief rationale for the TREE_RCU-related test
cases, a group that includes TREE_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 CONFIG_NO_HZ_FULL_SYSIDLE.
CONFIG_NO_HZ_FULL_SYSIDLE -- Do one.
CONFIG_PREEMPT -- Do half. (First three and #8.)
CONFIG_PROVE_LOCKING -- Do all but two, covering CONFIG_PROVE_RCU and not.
CONFIG_PROVE_RCU -- Do all but one under CONFIG_PROVE_LOCKING.
CONFIG_PROVE_RCU_DELAY -- Do one.
CONFIG_RCU_BOOST -- one of TREE_PREEMPT_RCU.
CONFIG_RCU_BOOST_PRIO -- set to 2 for _BOOST testing.
CONFIG_RCU_CPU_STALL_INFO -- do one with and without _VERBOSE.
CONFIG_RCU_CPU_STALL_VERBOSE -- do one with and without _INFO.
CONFIG_RCU_FANOUT -- Cover hierarchy as currently, but overlap with others.
CONFIG_RCU_FANOUT_EXACT -- Do one.
CONFIG_RCU_FANOUT_LEAF -- Do one non-default.
CONFIG_RCU_FAST_NO_HZ -- Do one, but not with CONFIG_RCU_NOCB_CPU_ALL.
CONFIG_RCU_NOCB_CPU -- Do three, see below.
CONFIG_RCU_NOCB_CPU_ALL -- Do one.
CONFIG_RCU_NOCB_CPU_NONE -- Do one.
CONFIG_RCU_NOCB_CPU_ZERO -- Do one.
CONFIG_RCU_TRACE -- Do half.
CONFIG_SMP -- Need one !SMP for TREE_PREEMPT_RCU.
RCU-bh: Do one with PREEMPT and one with !PREEMPT.
RCU-sched: Do one with PREEMPT but not BOOST.
Hierarchy:
TREE01. CONFIG_NR_CPUS=8, CONFIG_RCU_FANOUT=8, CONFIG_RCU_FANOUT_EXACT=n.
TREE02. CONFIG_NR_CPUS=8, CONFIG_RCU_FANOUT=3, CONFIG_RCU_FANOUT_EXACT=n,
CONFIG_RCU_FANOUT_LEAF=3.
TREE03. CONFIG_NR_CPUS=8, CONFIG_RCU_FANOUT=4, CONFIG_RCU_FANOUT_EXACT=n,
CONFIG_RCU_FANOUT_LEAF=4.
TREE04. CONFIG_NR_CPUS=8, CONFIG_RCU_FANOUT=2, CONFIG_RCU_FANOUT_EXACT=n,
CONFIG_RCU_FANOUT_LEAF=2.
TREE05. CONFIG_NR_CPUS=8, CONFIG_RCU_FANOUT=6, CONFIG_RCU_FANOUT_EXACT=n
CONFIG_RCU_FANOUT_LEAF=6.
TREE06. CONFIG_NR_CPUS=8, CONFIG_RCU_FANOUT=6, CONFIG_RCU_FANOUT_EXACT=y
CONFIG_RCU_FANOUT_LEAF=6.
TREE07. CONFIG_NR_CPUS=16, CONFIG_RCU_FANOUT=2, CONFIG_RCU_FANOUT_EXACT=n,
CONFIG_RCU_FANOUT_LEAF=2.
TREE08. CONFIG_NR_CPUS=16, CONFIG_RCU_FANOUT=3, CONFIG_RCU_FANOUT_EXACT=y,
CONFIG_RCU_FANOUT_LEAF=2.
TREE09. CONFIG_NR_CPUS=1.
Kconfig Parameters Ignored:
CONFIG_64BIT
Used only to check CONFIG_RCU_FANOUT value, inspection suffices.
CONFIG_NO_HZ_FULL_SYSIDLE_SMALL
Defer until Frederic uses this.
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 TREE_PREEMPT_RCU.
CONFIG_RCU_TORTURE_TEST
CONFIG_RCU_TORTURE_TEST_RUNNABLE
Always used in KVM testing.
CONFIG_RCU_USER_QS
Redundant with CONFIG_NO_HZ_FULL.
CONFIG_TREE_PREEMPT_RCU
CONFIG_TREE_RCU
These are controlled by CONFIG_PREEMPT.
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