[PATCH tip/core/rcu 26/30] refperf: Add test for RCU Tasks readers

paulmck
2020-06-23T00:31:22Z

This commit adds testing for RCU Tasks readers to the refperf module.
This also applies to RCU Rude readers, as both flavors have empty
(as in non-existent) read-side markers.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/refperf.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/refperf.c b/kernel/rcu/refperf.c
index da7de9a..2bfdcdc 100644
--- a/kernel/rcu/refperf.c
+++ b/kernel/rcu/refperf.c
@@ -192,6 +192,31 @@ static struct ref_perf_ops srcu_ops = {
.name = "srcu"
};

+// Definitions for RCU Tasks ref perf testing: Empty read markers.
+// These definitions also work for RCU Rude readers.
+static void rcu_tasks_ref_perf_read_section(const int nloops)
+{
+ int i;
+
+ for (i = nloops; i >= 0; i--)
+ continue;
+}
+
+static void rcu_tasks_ref_perf_delay_section(const int nloops, const int udl, const int ndl)
+{
+ int i;
+
+ for (i = nloops; i >= 0; i--)
+ un_delay(udl, ndl);
+}
+
+static struct ref_perf_ops rcu_tasks_ops = {
+ .init = rcu_sync_perf_init,
+ .readsection = rcu_tasks_ref_perf_read_section,
+ .delaysection = rcu_tasks_ref_perf_delay_section,
+ .name = "rcu-tasks"
+};
+
// Definitions for RCU Tasks Trace ref perf testing.
static void rcu_trace_ref_perf_read_section(const int nloops)
{
@@ -613,7 +638,8 @@ ref_perf_init(void)
long i;
int firsterr = 0;
static struct ref_perf_ops *perf_ops[] = {
- &rcu_ops, &srcu_ops, &rcu_trace_ops, &refcnt_ops, &rwlock_ops, &rwsem_ops,
+ &rcu_ops, &srcu_ops, &rcu_trace_ops, &rcu_tasks_ops,
+ &refcnt_ops, &rwlock_ops, &rwsem_ops,
};

if (!torture_init_begin(perf_type, verbose))
--
2.9.5