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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
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