From: Boqun Feng <boqun.feng@gmail.com>
To: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, lkmm@lists.linux.dev
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Will Deacon <will@kernel.org>,
Boqun Feng <boqun.feng@gmail.com>,
Waiman Long <longman@redhat.com>,
Davidlohr Bueso <dave@stgolabs.net>,
"Paul E. McKenney" <paulmck@kernel.org>,
Josh Triplett <josh@joshtriplett.org>,
Frederic Weisbecker <frederic@kernel.org>,
Neeraj Upadhyay <neeraj.upadhyay@kernel.org>,
Joel Fernandes <joelagnelf@nvidia.com>,
Uladzislau Rezki <urezki@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Zqiang <qiang.zhang@linux.dev>, Breno Leitao <leitao@debian.org>,
aeh@meta.com, netdev@vger.kernel.org, edumazet@google.com,
jhs@mojatatu.com, kernel-team@meta.com,
Erik Lundgren <elundgren@meta.com>
Subject: [PATCH 2/8] shazptr: Add refscale test
Date: Tue, 24 Jun 2025 20:10:55 -0700 [thread overview]
Message-ID: <20250625031101.12555-3-boqun.feng@gmail.com> (raw)
In-Reply-To: <20250625031101.12555-1-boqun.feng@gmail.com>
Add the refscale test for shazptr to measure the reader side
performance.
Signed-off-by: Boqun Feng <boqun.feng@gmail.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))
--
2.39.5 (Apple Git-154)
next prev parent reply other threads:[~2025-06-25 3:11 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-25 3:10 [PATCH 0/8] Introduce simple hazard pointers for lockdep Boqun Feng
2025-06-25 3:10 ` [PATCH 1/8] Introduce simple hazard pointers Boqun Feng
2025-06-25 10:00 ` Peter Zijlstra
2025-06-25 14:25 ` Mathieu Desnoyers
2025-06-25 15:05 ` Boqun Feng
2025-06-25 15:52 ` Waiman Long
2025-06-25 16:09 ` Boqun Feng
2025-06-25 17:47 ` Waiman Long
2025-06-25 3:10 ` Boqun Feng [this message]
2025-06-25 10:02 ` [PATCH 2/8] shazptr: Add refscale test Peter Zijlstra
2025-06-25 3:10 ` [PATCH 3/8] shazptr: Add refscale test for wildcard Boqun Feng
2025-06-25 10:03 ` Peter Zijlstra
2025-06-25 3:10 ` [PATCH 4/8] shazptr: Avoid synchronize_shaptr() busy waiting Boqun Feng
2025-06-25 11:40 ` Peter Zijlstra
2025-06-25 11:56 ` Peter Zijlstra
2025-06-25 13:56 ` Frederic Weisbecker
2025-06-25 15:24 ` Boqun Feng
2025-06-26 13:45 ` Frederic Weisbecker
2025-06-25 3:10 ` [PATCH 5/8] shazptr: Allow skip self scan in synchronize_shaptr() Boqun Feng
2025-06-25 3:10 ` [PATCH 6/8] rcuscale: Allow rcu_scale_ops::get_gp_seq to be NULL Boqun Feng
2025-06-25 3:11 ` [PATCH 7/8] rcuscale: Add tests for simple hazard pointers Boqun Feng
2025-06-25 3:11 ` [PATCH 8/8] locking/lockdep: Use shazptr to protect the key hashlist Boqun Feng
2025-06-25 11:59 ` Peter Zijlstra
2025-06-25 14:18 ` Boqun Feng
2025-07-10 14:06 ` Breno Leitao
2025-07-11 2:31 ` Boqun Feng
2025-06-25 12:05 ` [PATCH 0/8] Introduce simple hazard pointers for lockdep Christoph Hellwig
2025-06-25 14:08 ` Boqun Feng
2025-06-26 10:16 ` Christoph Hellwig
2025-06-26 13:45 ` Mathieu Desnoyers
2025-06-26 15:47 ` Boqun Feng
2025-06-27 2:56 ` Paul E. McKenney
2025-06-25 12:25 ` Mathieu Desnoyers
2025-06-25 13:21 ` Boqun Feng
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