| 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 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_RCU_BOOST -- one of PREEMPT_RCU. |
| CONFIG_RCU_KTHREAD_PRIO -- set to 2 for _BOOST testing. |
| CONFIG_RCU_CPU_STALL_INFO -- Do one. |
| 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 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 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_PREEMPT_RCU |
| CONFIG_TREE_RCU |
| |
| These are controlled by CONFIG_PREEMPT. |
