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

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Message-Id: <20200623003013.26252-26-paulmck@kernel.org>
Date:   Mon, 22 Jun 2020 17:30:09 -0700
From:   paulmck@...nel.org
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 26/30] refperf: Add test for RCU Tasks readers

From: "Paul E. McKenney" <paulmck@...nel.org>

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@...nel.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