* [PATCH] rcuscale: add srcu_atomic scale type
@ 2026-09-27 10:03 Kunwu Chan
2026-09-27 20:00 ` Bradley Morgan
0 siblings, 1 reply; 2+ messages in thread
From: Kunwu Chan @ 2026-09-27 10:03 UTC (permalink / raw)
To: dave, paulmck, josh, frederic, neeraj.upadhyay, joelagnelf,
boqun, urezki
Cc: rostedt, mathieu.desnoyers, jiangshanlai, qiang.zhang,
linux-kernel, rcu, Kunwu Chan
Add support for scaling atomic SRCU grace periods using
srcu_read_lock_atomic()/srcu_read_unlock_atomic() and
synchronize_srcu_atomic().
Signed-off-by: Kunwu Chan <kunwu.chan@gmail.com>
---
kernel/rcu/rcuscale.c | 47 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 46 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c
index 5aca31c3c01d..86f1a912ebee 100644
--- a/kernel/rcu/rcuscale.c
+++ b/kernel/rcu/rcuscale.c
@@ -264,6 +264,51 @@ static struct rcu_scale_ops srcu_ops = {
.name = "srcu"
};
+static struct srcu_struct srcu_atomic_ctlp;
+
+static int srcu_scale_atomic_read_lock(void)
+{
+ return srcu_read_lock_atomic(&srcu_atomic_ctlp);
+}
+
+static void srcu_scale_atomic_read_unlock(int idx)
+{
+ srcu_read_unlock_atomic(&srcu_atomic_ctlp, idx);
+}
+
+static void srcu_scale_atomic_synchronize(void)
+{
+ synchronize_srcu_atomic(&srcu_atomic_ctlp);
+}
+
+static void srcu_atomic_scale_init(void)
+{
+ init_srcu_struct_atomic(&srcu_atomic_ctlp);
+}
+
+static void srcu_atomic_scale_cleanup(void)
+{
+ cleanup_srcu_struct(&srcu_atomic_ctlp);
+}
+
+static unsigned long srcu_atomic_scale_completed(void)
+{
+ return srcu_batches_completed(&srcu_atomic_ctlp);
+}
+
+static struct rcu_scale_ops srcu_atomic_ops = {
+ .ptype = SRCU_FLAVOR,
+ .init = srcu_atomic_scale_init,
+ .cleanup = srcu_atomic_scale_cleanup,
+ .readlock = srcu_scale_atomic_read_lock,
+ .readunlock = srcu_scale_atomic_read_unlock,
+ .get_gp_seq = srcu_atomic_scale_completed,
+ .gp_diff = rcu_seq_diff,
+ .exp_completed = srcu_atomic_scale_completed,
+ .sync = srcu_scale_atomic_synchronize,
+ .name = "srcu_atomic"
+};
+
static struct srcu_struct srcud;
static void srcu_sync_scale_init(void)
@@ -1176,7 +1221,7 @@ rcu_scale_init(void)
long i;
long j;
static struct rcu_scale_ops *scale_ops[] = {
- &rcu_ops, &srcu_ops, &srcud_ops,
+ &rcu_ops, &srcu_ops, &srcu_atomic_ops, &srcud_ops,
TASKS_OPS TASKS_RUDE_OPS TASKS_TRACING_OPS
HAZPTR_SCALE_OPS
};
--
2.43.0
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] rcuscale: add srcu_atomic scale type
2026-09-27 10:03 [PATCH] rcuscale: add srcu_atomic scale type Kunwu Chan
@ 2026-09-27 20:00 ` Bradley Morgan
0 siblings, 0 replies; 2+ messages in thread
From: Bradley Morgan @ 2026-09-27 20:00 UTC (permalink / raw)
To: kunwu.chan
Cc: boqun, dave, frederic, jiangshanlai, joelagnelf, josh,
linux-kernel, mathieu.desnoyers, neeraj.upadhyay, paulmck,
qiang.zhang, rcu, rostedt, urezki
On 27 September 2026 11:03:59 BST, Kunwu Chan <kunwu.chan@gmail.com> wrote:
>Add support for scaling atomic SRCU grace periods using
>srcu_read_lock_atomic()/srcu_read_unlock_atomic() and
>synchronize_srcu_atomic().
>
Ummm. Ok then!
Reviewed-by: Bradley Morgan <brads@mainlining.org>
>Signed-off-by: Kunwu Chan <kunwu.chan@gmail.com>
>---
> kernel/rcu/rcuscale.c | 47 ++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 46 insertions(+), 1 deletion(-)
>
>diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c
>index 5aca31c3c01d..86f1a912ebee 100644
>--- a/kernel/rcu/rcuscale.c
>+++ b/kernel/rcu/rcuscale.c
>@@ -264,6 +264,51 @@ static struct rcu_scale_ops srcu_ops = {
> .name = "srcu"
> };
>
>+static struct srcu_struct srcu_atomic_ctlp;
>+
>+static int srcu_scale_atomic_read_lock(void)
>+{
>+ return srcu_read_lock_atomic(&srcu_atomic_ctlp);
>+}
>+
>+static void srcu_scale_atomic_read_unlock(int idx)
>+{
>+ srcu_read_unlock_atomic(&srcu_atomic_ctlp, idx);
>+}
>+
>+static void srcu_scale_atomic_synchronize(void)
>+{
>+ synchronize_srcu_atomic(&srcu_atomic_ctlp);
>+}
>+
>+static void srcu_atomic_scale_init(void)
>+{
>+ init_srcu_struct_atomic(&srcu_atomic_ctlp);
>+}
>+
>+static void srcu_atomic_scale_cleanup(void)
>+{
>+ cleanup_srcu_struct(&srcu_atomic_ctlp);
>+}
>+
>+static unsigned long srcu_atomic_scale_completed(void)
>+{
>+ return srcu_batches_completed(&srcu_atomic_ctlp);
>+}
>+
>+static struct rcu_scale_ops srcu_atomic_ops = {
>+ .ptype = SRCU_FLAVOR,
>+ .init = srcu_atomic_scale_init,
>+ .cleanup = srcu_atomic_scale_cleanup,
>+ .readlock = srcu_scale_atomic_read_lock,
>+ .readunlock = srcu_scale_atomic_read_unlock,
>+ .get_gp_seq = srcu_atomic_scale_completed,
>+ .gp_diff = rcu_seq_diff,
>+ .exp_completed = srcu_atomic_scale_completed,
>+ .sync = srcu_scale_atomic_synchronize,
>+ .name = "srcu_atomic"
>+};
>+
> static struct srcu_struct srcud;
>
> static void srcu_sync_scale_init(void)
>@@ -1176,7 +1221,7 @@ rcu_scale_init(void)
> long i;
> long j;
> static struct rcu_scale_ops *scale_ops[] = {
>- &rcu_ops, &srcu_ops, &srcud_ops,
>+ &rcu_ops, &srcu_ops, &srcu_atomic_ops, &srcud_ops,
> TASKS_OPS TASKS_RUDE_OPS TASKS_TRACING_OPS
> HAZPTR_SCALE_OPS
> };
>
--- Thanks!
"I'm not a very positive person" - Linus torvalds
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-09-27 20:00 ` Bradley Morgan
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