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Message-ID: <6a9cf878-e08a-498d-857a-a9fd4bfd6c12@paulmck-laptop>
Date: Mon, 28 Oct 2024 17:25:12 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com, rostedt@...dmis.org,
Alexei Starovoitov <ast@...nel.org>,
Andrii Nakryiko <andrii@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Kent Overstreet <kent.overstreet@...ux.dev>, bpf@...r.kernel.org
Subject: [PATCH rcu v4 14/15] refscale: Add srcu_read_lock_lite() support
using "srcu-lite"
This commit creates a new srcu-lite option for the refscale.scale_type
module parameter that selects srcu_read_lock_lite() and
srcu_read_unlock_lite().
[ paulmck: Apply Dan Carpenter feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: <bpf@...r.kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 0db9db73f57f2..338e7c5ac44a1 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -212,6 +212,36 @@ static const struct ref_scale_ops srcu_ops = {
.name = "srcu"
};
+static void srcu_lite_ref_scale_read_section(const int nloops)
+{
+ int i;
+ int idx;
+
+ for (i = nloops; i >= 0; i--) {
+ idx = srcu_read_lock_lite(srcu_ctlp);
+ srcu_read_unlock_lite(srcu_ctlp, idx);
+ }
+}
+
+static void srcu_lite_ref_scale_delay_section(const int nloops, const int udl, const int ndl)
+{
+ int i;
+ int idx;
+
+ for (i = nloops; i >= 0; i--) {
+ idx = srcu_read_lock_lite(srcu_ctlp);
+ un_delay(udl, ndl);
+ srcu_read_unlock_lite(srcu_ctlp, idx);
+ }
+}
+
+static const struct ref_scale_ops srcu_lite_ops = {
+ .init = rcu_sync_scale_init,
+ .readsection = srcu_lite_ref_scale_read_section,
+ .delaysection = srcu_lite_ref_scale_delay_section,
+ .name = "srcu-lite"
+};
+
#ifdef CONFIG_TASKS_RCU
// Definitions for RCU Tasks ref scale testing: Empty read markers.
@@ -1082,9 +1112,10 @@ ref_scale_init(void)
long i;
int firsterr = 0;
static const struct ref_scale_ops *scale_ops[] = {
- &rcu_ops, &srcu_ops, RCU_TRACE_OPS RCU_TASKS_OPS &refcnt_ops, &rwlock_ops,
- &rwsem_ops, &lock_ops, &lock_irq_ops, &acqrel_ops, &clock_ops, &jiffies_ops,
- &typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops,
+ &rcu_ops, &srcu_ops, &srcu_lite_ops, RCU_TRACE_OPS RCU_TASKS_OPS
+ &refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops, &acqrel_ops,
+ &clock_ops, &jiffies_ops, &typesafe_ref_ops, &typesafe_lock_ops,
+ &typesafe_seqlock_ops,
};
if (!torture_init_begin(scale_type, verbose))
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