On Thu, Jul 20, 2023 at 12:53:05PM -0700, Paul E. McKenney wrote:
On Thu, Jul 20, 2023 at 05:30:53PM +0100, Valentin Schneider wrote:
We now have an RCU_EXPORT knob for configuring the size of the dynticks counter: CONFIG_RCU_DYNTICKS_BITS.
Add a torture config for a ridiculously small counter (2 bits). This is ac opy of TREE4 with the added counter size restriction.
Link: http://lore.kernel.org/r/4c2cb573-168f-4806-b1d9-164e8276e66a@paulmck-laptop Suggested-by: Paul E. McKenney paulmck@kernel.org Signed-off-by: Valentin Schneider vschneid@redhat.com
.../selftests/rcutorture/configs/rcu/TREE11 | 19 +++++++++++++++++++ .../rcutorture/configs/rcu/TREE11.boot | 1 + 2 files changed, 20 insertions(+) create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE11 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE11.boot
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TREE11 b/tools/testing/selftests/rcutorture/configs/rcu/TREE11 new file mode 100644 index 0000000000000..aa7274efd9819 --- /dev/null +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE11 @@ -0,0 +1,19 @@ +CONFIG_SMP=y +CONFIG_NR_CPUS=8 +CONFIG_PREEMPT_NONE=n +CONFIG_PREEMPT_VOLUNTARY=y +CONFIG_PREEMPT=n +CONFIG_PREEMPT_DYNAMIC=n +#CHECK#CONFIG_TREE_RCU=y +CONFIG_HZ_PERIODIC=n +CONFIG_NO_HZ_IDLE=n +CONFIG_NO_HZ_FULL=y +CONFIG_RCU_TRACE=y +CONFIG_RCU_FANOUT=4 +CONFIG_RCU_FANOUT_LEAF=3 +CONFIG_DEBUG_LOCK_ALLOC=n +CONFIG_DEBUG_OBJECTS_RCU_HEAD=n +CONFIG_RCU_EXPERT=y +CONFIG_RCU_EQS_DEBUG=y +CONFIG_RCU_LAZY=y +CONFIG_RCU_DYNTICKS_BITS=2
Why not just add this last line to the existing TREE04 scenario? That would ensure that it gets tested regularly without extending the time required to run a full set of rcutorture tests.
Please see below for the version of this patch that I am running overnight tests with. Does this one work for you?
Thanx, Paul
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commit 1aa13731e665193cd833edac5ebc86a9c3fea2b7 Author: Valentin Schneider vschneid@redhat.com Date: Thu Jul 20 20:58:41 2023 -0700
rcutorture: Add a test config to torture test low RCU_DYNTICKS width
We now have an RCU_EXPORT knob for configuring the size of the dynticks counter: CONFIG_RCU_DYNTICKS_BITS.
Modify scenario TREE04 to exercise a a ridiculously small counter (2 bits).
Link: http://lore.kernel.org/r/4c2cb573-168f-4806-b1d9-164e8276e66a@paulmck-laptop Suggested-by: Paul E. McKenney paulmck@kernel.org Signed-off-by: Valentin Schneider vschneid@redhat.com Signed-off-by: Paul E. McKenney paulmck@kernel.org
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TREE04 b/tools/testing/selftests/rcutorture/configs/rcu/TREE04 index dc4985064b3a..aa7274efd981 100644 --- a/tools/testing/selftests/rcutorture/configs/rcu/TREE04 +++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE04 @@ -16,3 +16,4 @@ CONFIG_DEBUG_OBJECTS_RCU_HEAD=n CONFIG_RCU_EXPERT=y CONFIG_RCU_EQS_DEBUG=y CONFIG_RCU_LAZY=y +CONFIG_RCU_DYNTICKS_BITS=2