linux-kernel - [RFC PATCH 2/8] shazptr: Add refscale test

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Message-ID: <20250414060055.341516-3-boqun.feng@gmail.com>
Date: Sun, 13 Apr 2025 23:00:49 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Breno Leitao <leitao@...ian.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>
Cc: aeh@...a.com,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	edumazet@...gle.com,
	jhs@...atatu.com,
	kernel-team@...a.com,
	Erik Lundgren <elundgren@...a.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Uladzislau Rezki <urezki@...il.com>,
	rcu@...r.kernel.org,
	Boqun Feng <boqun.feng@...il.com>
Subject: [RFC PATCH 2/8] shazptr: Add refscale test

Add the refscale test for shazptr to measure the reader side
performance.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 kernel/rcu/refscale.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index f11a7c2af778..154520e4ee4c 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -29,6 +29,7 @@
 #include <linux/reboot.h>
 #include <linux/sched.h>
 #include <linux/seq_buf.h>
+#include <linux/shazptr.h>
 #include <linux/spinlock.h>
 #include <linux/smp.h>
 #include <linux/stat.h>
@@ -890,6 +891,43 @@ static const struct ref_scale_ops typesafe_seqlock_ops = {
 	.name		= "typesafe_seqlock"
 };
 
+static void ref_shazptr_read_section(const int nloops)
+{
+	int i;
+
+	for (i = nloops; i >= 0; i--) {
+		preempt_disable();
+		{ guard(shazptr)(ref_shazptr_read_section); }
+		preempt_enable();
+	}
+}
+
+static void ref_shazptr_delay_section(const int nloops, const int udl, const int ndl)
+{
+	int i;
+
+	for (i = nloops; i >= 0; i--) {
+		preempt_disable();
+		{
+			guard(shazptr)(ref_shazptr_delay_section);
+			un_delay(udl, ndl);
+		}
+		preempt_enable();
+	}
+}
+
+static bool ref_shazptr_init(void)
+{
+	return true;
+}
+
+static const struct ref_scale_ops shazptr_ops = {
+	.init		= ref_shazptr_init,
+	.readsection	= ref_shazptr_read_section,
+	.delaysection	= ref_shazptr_delay_section,
+	.name		= "shazptr"
+};
+
 static void rcu_scale_one_reader(void)
 {
 	if (readdelay <= 0)
@@ -1197,6 +1235,7 @@ ref_scale_init(void)
 		&refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops,
 		&acqrel_ops, &sched_clock_ops, &clock_ops, &jiffies_ops,
 		&typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops,
+		&shazptr_ops,
 	};
 
 	if (!torture_init_begin(scale_type, verbose))
-- 
2.47.1