RCU Kconfig fixes for v4.2
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- v1 Latest12 patches 7 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/12 | rcu: Directly drive TASKS_RCU from Kconfiginit/ lib/ | +2 | 0 replies | |
| 2/12 | rcutorture: TASKS_RCU set directly, so don't explicitly set ittools/ tools/ tools/ | +0 | 0 replies | |
| 3/12 | rcu: Directly drive RCU_USER_QS from Kconfiginit/ | +1 | 0 replies | |
| 4/12 | rcu: Covert CONFIG_RCU_FANOUT_EXACT to boot parameterDocumentation/ init/ kernel/ +1 more | +12 | 0 replies | |
| 5/12 | rcutorture: Update configuration fragments for rcutree.rcu_fanout_exacttools/ tools/ tools/ +9 more | +3 | 2 replies | |
| 6/12 | rcu: Enable diagnostic dump of rcu_node combining treeDocumentation/ kernel/ | +32 | 0 replies | |
| 7/12 | rcu: Create RCU_EXPERT Kconfig and hide booleans behind itinit/ | +19 | 0 replies | |
| 8/12 | rcutorture: Make rcutorture scripts force RCU_EXPERTtools/ tools/ tools/ +7 more | +10 | 0 replies | |
| 9/12 | rcu: Break dependency of RCU_FANOUT_LEAF on RCU_FANOUTinit/ | +4 | 2 replies | |
| 10/12 | rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUTinit/ kernel/ kernel/ +1 more | +20 | 0 replies | |
| 11/12 | rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUT_LEAFinit/ kernel/ kernel/ +1 more | +19 | 2 replies | |
| 12/12 | rcu: Make RCU able to tolerate undefined CONFIG_RCU_KTHREAD_PRIOinit/ kernel/ | +5 | 0 replies |
Reviews trailers per patch
None of the 12 patches has a Reviewed-by or Acked-by of their own; the series has one for all of them.
| Patch | Pranith Kumar |
|---|---|
| Series | R-b |
| 1/12 | |
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Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH tip/core/rcu 0/12] RCU Kconfig fixes for v4.2
Hello!
This patch series reduces the number of questions that RCU asks Kconfig users. After this series is applied, removing the RCU-related definitions from .config and running "make oldconfig" results in only the following:
RCU Implementation
Quoted 1 line
1. Tree-based hierarchical RCU (
TREE_RCU) (NEW)
choice[1]: 1
Make expert-level adjustments to RCU configuration (RCU_EXPERT) [N/y/?] (NEW)
Those expert users wishing to tune RCU answer Y to this question.
The patches in this series are as follows:
1. Drive TASKS_RCU directly from Kconfig, for example, by having
RCU_TORTURE_TESTS select it.
2. Remove CONFIG_TASKS_RCU=y from the three TASKS_RCU test
scenarios, since this is set by virtue of having rcutorture configured.
3. Drive RCU_USER_QS directly from Kconfig, relying on the fact
that NO_HZ_FULL selects it.
4. Convert CONFIG_RCU_FANOUT_EXACT to a boot parameter, where it
is used by rcutorture.
5. Update rcutorture test scenarios to use the boot parameter
created in #4 instead of the Kconfig parameter.
6. Create a boot parameter to do a diagnostic dump of the shape
of the rcu_node combining tree, which is useful for verifying that intended changes to that tree actually happened.
7. Create an RCU_EXPERT Kconfig parameter and hide the
RCU_FAST_NO_HZ, RCU_BOOST, CONTEXT_TRACKING_FORCE, and RCU_NOCB_CPU boolean parameters behind it.
8. Make rcutorture test scenarios force RCU_EXPERT, but have
SRCU-P, TASKS03, and TREE09 retain !RCU_EXPERT in order to test the vanilla configuration.
9. Remove the dependency of RCU_FANOUT_LEAF on RCU_FANOUT.
10. Change RCU to allow it to tolerate an undefined RCU_FANOUT,
and then hide RCU_FANOUT behind RCU_EXPERT.
11. Change RCU to allow it to tolerate an undefined RCU_FANOUT_LEAF,
and then hide RCU_FANOUT_LEAF behind RCU_EXPERT.
12. Change RCU to allow it to tolerate an undefined RCU_KTHREAD_PRIO,
and then hide RCU_KTHREAD_PRIO behind RCU_EXPERT.
Thanx, Paul
------------------------------------------------------------------------
b/Documentation/kernel-parameters.txt | 11 + b/init/Kconfig | 62 ++++------ b/kernel/rcu/tree.c | 50 ++++++-- b/kernel/rcu/tree.h | 29 ++++ b/kernel/rcu/tree_plugin.h | 14 +- b/lib/Kconfig.debug | 1 b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-N | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TASKS01 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TASKS02 | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TASKS03 | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TREE01 | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TREE02 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TREE02-T | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TREE03 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TREE04 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TREE05 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TREE06 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TREE06.boot | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TREE07 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TREE08 | 2 b/tools/testing/selftests/rcutorture/configs/rcu/TREE08-T | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TREE08-T.boot | 1 b/tools/testing/selftests/rcutorture/configs/rcu/TREE08.boot | 1 23 files changed, 127 insertions(+), 65 deletions(-)