[PATCH RFC v2 tip/core/rcu 15/22] rcutorture: Add torture tests for RCU Tasks Trace

paulmck
2020-03-19T00:11:38Z

This commit adds the definitions required to torture the tracing flavor
of RCU tasks.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/Kconfig.debug | 2 +
kernel/rcu/rcu.h | 1 +
kernel/rcu/rcutorture.c | 44 +++++++++++++++++++++-
.../selftests/rcutorture/configs/rcu/CFLIST | 1 +
.../selftests/rcutorture/configs/rcu/TRACE01 | 10 +++++
.../selftests/rcutorture/configs/rcu/TRACE01.boot | 1 +
6 files changed, 58 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TRACE01
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TRACE01.boot

diff --git a/kernel/rcu/Kconfig.debug b/kernel/rcu/Kconfig.debug
index b15a3bd..a4db41d 100644
--- a/kernel/rcu/Kconfig.debug
+++ b/kernel/rcu/Kconfig.debug
@@ -25,6 +25,7 @@ config RCU_PERF_TEST
select SRCU
select TASKS_RCU
select TASKS_RUDE_RCU
+ select TASKS_TRACE_RCU
default n
help
This option provides a kernel module that runs performance
@@ -43,6 +44,7 @@ config RCU_TORTURE_TEST
select SRCU
select TASKS_RCU
select TASKS_RUDE_RCU
+ select TASKS_TRACE_RCU
default n
help
This option provides a kernel module that runs torture tests
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index c574620..72903867 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -442,6 +442,7 @@ enum rcutorture_type {
RCU_FLAVOR,
RCU_TASKS_FLAVOR,
RCU_TASKS_RUDE_FLAVOR,
+ RCU_TASKS_TRACING_FLAVOR,
RCU_TRIVIAL_FLAVOR,
SRCU_FLAVOR,
INVALID_RCU_FLAVOR
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 386cd11..bb6daa58 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -45,6 +45,7 @@
#include <linux/sched/sysctl.h>
#include <linux/oom.h>
#include <linux/tick.h>
+#include <linux/rcupdate_trace.h>

#include "rcu.h"

@@ -758,6 +759,45 @@ static struct rcu_torture_ops tasks_rude_ops = {
.name = "tasks-rude"
};

+/*
+ * Definitions for tracing RCU-tasks torture testing.
+ */
+
+static int tasks_tracing_torture_read_lock(void)
+{
+ rcu_read_lock_trace();
+ return 0;
+}
+
+static void tasks_tracing_torture_read_unlock(int idx)
+{
+ rcu_read_unlock_trace();
+}
+
+static void rcu_tasks_tracing_torture_deferred_free(struct rcu_torture *p)
+{
+ call_rcu_tasks_trace(&p->rtort_rcu, rcu_torture_cb);
+}
+
+static struct rcu_torture_ops tasks_tracing_ops = {
+ .ttype = RCU_TASKS_TRACING_FLAVOR,
+ .init = rcu_sync_torture_init,
+ .readlock = tasks_tracing_torture_read_lock,
+ .read_delay = srcu_read_delay, /* just reuse srcu's version. */
+ .readunlock = tasks_tracing_torture_read_unlock,
+ .get_gp_seq = rcu_no_completed,
+ .deferred_free = rcu_tasks_tracing_torture_deferred_free,
+ .sync = synchronize_rcu_tasks_trace,
+ .exp_sync = synchronize_rcu_tasks_trace,
+ .call = call_rcu_tasks_trace,
+ .cb_barrier = rcu_barrier_tasks_trace,
+ .fqs = NULL,
+ .stats = NULL,
+ .irq_capable = 1,
+ .slow_gps = 1,
+ .name = "tasks-tracing"
+};
+
static unsigned long rcutorture_seq_diff(unsigned long new, unsigned long old)
{
if (!cur_ops->gp_diff)
@@ -1316,6 +1356,7 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp)
rcu_read_lock_bh_held() ||
rcu_read_lock_sched_held() ||
srcu_read_lock_held(srcu_ctlp) ||
+ rcu_read_lock_trace_held() ||
torturing_tasks());
if (p == NULL) {
/* Wait for rcu_torture_writer to get underway */
@@ -2435,7 +2476,8 @@ rcu_torture_init(void)
int firsterr = 0;
static struct rcu_torture_ops *torture_ops[] = {
&rcu_ops, &rcu_busted_ops, &srcu_ops, &srcud_ops,
- &busted_srcud_ops, &tasks_ops, &tasks_rude_ops, &trivial_ops,
+ &busted_srcud_ops, &tasks_ops, &tasks_rude_ops,
+ &tasks_tracing_ops, &trivial_ops,
};

if (!torture_init_begin(torture_type, verbose))
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/CFLIST b/tools/testing/selftests/rcutorture/configs/rcu/CFLIST
index ec0c72f..dfb1817 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/CFLIST
+++ b/tools/testing/selftests/rcutorture/configs/rcu/CFLIST
@@ -15,3 +15,4 @@ TASKS01
TASKS02
TASKS03
RUDE01
+TRACE01
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TRACE01 b/tools/testing/selftests/rcutorture/configs/rcu/TRACE01
new file mode 100644
index 0000000..078e2c1
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/configs/rcu/TRACE01
@@ -0,0 +1,10 @@
+CONFIG_SMP=y
+CONFIG_NR_CPUS=4
+CONFIG_HOTPLUG_CPU=y
+CONFIG_PREEMPT_NONE=y
+CONFIG_PREEMPT_VOLUNTARY=n
+CONFIG_PREEMPT=n
+CONFIG_DEBUG_LOCK_ALLOC=y
+CONFIG_PROVE_LOCKING=y
+#CHECK#CONFIG_PROVE_RCU=y
+CONFIG_RCU_EXPERT=y
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TRACE01.boot b/tools/testing/selftests/rcutorture/configs/rcu/TRACE01.boot
new file mode 100644
index 0000000..9675ad6
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/configs/rcu/TRACE01.boot
@@ -0,0 +1 @@
+rcutorture.torture_type=tasks-tracing
--
2.9.5