* [PATCH 2/4] refcount: add ref_trace_final_put tracepoint
[not found] <20260704-refcount-final-put-trace-v1-0-b48746da1f27@mavick.dev>
@ 2026-07-04 11:34 ` Eugene Mavick
2026-07-04 11:34 ` [PATCH 3/4] percpu-refcount: add ref_trace_final_put trace Eugene Mavick
1 sibling, 0 replies; 5+ messages in thread
From: Eugene Mavick @ 2026-07-04 11:34 UTC (permalink / raw)
To: Will Deacon, Peter Zijlstra, Boqun Feng, Mark Rutland, Gary Guo,
Steven Rostedt, Masami Hiramatsu, Mathieu Desnoyers,
Andrew Morton, Dennis Zhou, Tejun Heo, Christoph Lameter
Cc: linux-kernel, linux-trace-kernel, linux-mm, Eugene Mavick
Add the ref_trace_final_put tracepoint to __refcount_sub_and_test().
This fires when a refcount_t reaches zero, capturing the caller
address, the function name, and the refcount_t address.
Signed-off-by: Eugene Mavick <m@mavick.dev>
---
include/linux/refcount.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/linux/refcount.h b/include/linux/refcount.h
index ba7657ced281..7b1fbf326a21 100644
--- a/include/linux/refcount.h
+++ b/include/linux/refcount.h
@@ -107,6 +107,7 @@
#include <linux/limits.h>
#include <linux/refcount_types.h>
#include <linux/spinlock_types.h>
+#include <linux/ref_trace.h>
struct mutex;
@@ -393,6 +394,7 @@ bool __refcount_sub_and_test(int i, refcount_t *r, int *oldp)
if (old > 0 && old == i) {
smp_acquire__after_ctrl_dep();
+ trace_ref_final_put(r);
return true;
}
--
2.51.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 3/4] percpu-refcount: add ref_trace_final_put trace
[not found] <20260704-refcount-final-put-trace-v1-0-b48746da1f27@mavick.dev>
2026-07-04 11:34 ` [PATCH 2/4] refcount: add ref_trace_final_put tracepoint Eugene Mavick
@ 2026-07-04 11:34 ` Eugene Mavick
1 sibling, 0 replies; 5+ messages in thread
From: Eugene Mavick @ 2026-07-04 11:34 UTC (permalink / raw)
To: Will Deacon, Peter Zijlstra, Boqun Feng, Mark Rutland, Gary Guo,
Steven Rostedt, Masami Hiramatsu, Mathieu Desnoyers,
Andrew Morton, Dennis Zhou, Tejun Heo, Christoph Lameter
Cc: linux-kernel, linux-trace-kernel, linux-mm, Eugene Mavick
Add the ref_trace_final_put tracepoint to percpu_ref_put_many().
The tracepoint fires when the atomic counter reaches zero in the
atomic fallback path (after percpu_ref_kill() has been called).
Signed-off-by: Eugene Mavick <m@mavick.dev>
---
include/linux/percpu-refcount.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index d73a1c08c3e3..55543ecdf60c 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -55,6 +55,7 @@
#include <linux/rcupdate.h>
#include <linux/types.h>
#include <linux/gfp.h>
+#include <linux/ref_trace.h>
struct percpu_ref;
typedef void (percpu_ref_func_t)(struct percpu_ref *);
@@ -331,8 +332,10 @@ static inline void percpu_ref_put_many(struct percpu_ref *ref, unsigned long nr)
if (__ref_is_percpu(ref, &percpu_count))
this_cpu_sub(*percpu_count, nr);
- else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count)))
+ else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count))) {
+ trace_ref_final_put(ref);
ref->data->release(ref);
+ }
rcu_read_unlock();
}
--
2.51.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 3/4] percpu-refcount: add ref_trace_final_put trace
2026-07-04 23:19 [PATCH 0/4] tracing: add ref_trace_final_put tracing Eugene Mavick
@ 2026-07-04 23:19 ` Eugene Mavick
0 siblings, 0 replies; 5+ messages in thread
From: Eugene Mavick @ 2026-07-04 23:19 UTC (permalink / raw)
To: Will Deacon, Peter Zijlstra, Boqun Feng, Mark Rutland, Gary Guo,
Steven Rostedt, Masami Hiramatsu, Mathieu Desnoyers,
Andrew Morton, Dennis Zhou, Tejun Heo, Christoph Lameter
Cc: linux-kernel, linux-trace-kernel, linux-mm, Eugene Mavick
Add the ref_trace_final_put tracepoint to percpu_ref_put_many().
The tracepoint fires when the atomic counter reaches zero in the
atomic fallback path (after percpu_ref_kill() has been called).
Signed-off-by: Eugene Mavick <m@mavick.dev>
---
include/linux/percpu-refcount.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index d73a1c08c3e3..55543ecdf60c 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -55,6 +55,7 @@
#include <linux/rcupdate.h>
#include <linux/types.h>
#include <linux/gfp.h>
+#include <linux/ref_trace.h>
struct percpu_ref;
typedef void (percpu_ref_func_t)(struct percpu_ref *);
@@ -331,8 +332,10 @@ static inline void percpu_ref_put_many(struct percpu_ref *ref, unsigned long nr)
if (__ref_is_percpu(ref, &percpu_count))
this_cpu_sub(*percpu_count, nr);
- else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count)))
+ else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count))) {
+ trace_ref_final_put(ref);
ref->data->release(ref);
+ }
rcu_read_unlock();
}
--
2.51.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 3/4] percpu-refcount: add ref_trace_final_put trace
2026-07-05 0:36 [PATCH 0/4] tracing: add ref_trace_final_put tracing Eugene Mavick
@ 2026-07-05 0:36 ` Eugene Mavick
0 siblings, 0 replies; 5+ messages in thread
From: Eugene Mavick @ 2026-07-05 0:36 UTC (permalink / raw)
To: Will Deacon, Peter Zijlstra, Boqun Feng, Mark Rutland, Gary Guo,
Steven Rostedt, Masami Hiramatsu, Mathieu Desnoyers,
Andrew Morton, Dennis Zhou, Tejun Heo, Christoph Lameter
Cc: linux-kernel, linux-trace-kernel, linux-mm, Eugene Mavick
Add the ref_trace_final_put tracepoint to percpu_ref_put_many().
The tracepoint fires when the atomic counter reaches zero in the
atomic fallback path (after percpu_ref_kill() has been called).
Signed-off-by: Eugene Mavick <m@mavick.dev>
---
include/linux/percpu-refcount.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index d73a1c08c3e3..55543ecdf60c 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -55,6 +55,7 @@
#include <linux/rcupdate.h>
#include <linux/types.h>
#include <linux/gfp.h>
+#include <linux/ref_trace.h>
struct percpu_ref;
typedef void (percpu_ref_func_t)(struct percpu_ref *);
@@ -331,8 +332,10 @@ static inline void percpu_ref_put_many(struct percpu_ref *ref, unsigned long nr)
if (__ref_is_percpu(ref, &percpu_count))
this_cpu_sub(*percpu_count, nr);
- else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count)))
+ else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count))) {
+ trace_ref_final_put(ref);
ref->data->release(ref);
+ }
rcu_read_unlock();
}
--
2.51.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 3/4] percpu-refcount: add ref_trace_final_put trace
2026-07-05 1:20 [PATCH 0/4] tracing: add ref_trace_final_put tracing Eugene Mavick via B4 Relay
@ 2026-07-05 1:20 ` Eugene Mavick via B4 Relay
0 siblings, 0 replies; 5+ messages in thread
From: Eugene Mavick via B4 Relay @ 2026-07-05 1:20 UTC (permalink / raw)
To: Will Deacon, Peter Zijlstra, Boqun Feng, Mark Rutland, Gary Guo,
Steven Rostedt, Masami Hiramatsu, Mathieu Desnoyers,
Andrew Morton, Dennis Zhou, Tejun Heo, Christoph Lameter
Cc: linux-kernel, linux-trace-kernel, linux-mm, Eugene Mavick
From: Eugene Mavick <m@mavick.dev>
Add the ref_trace_final_put tracepoint to percpu_ref_put_many().
The tracepoint fires when the atomic counter reaches zero in the
atomic fallback path (after percpu_ref_kill() has been called).
Signed-off-by: Eugene Mavick <m@mavick.dev>
---
include/linux/percpu-refcount.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index d73a1c08c3e3..55543ecdf60c 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -55,6 +55,7 @@
#include <linux/rcupdate.h>
#include <linux/types.h>
#include <linux/gfp.h>
+#include <linux/ref_trace.h>
struct percpu_ref;
typedef void (percpu_ref_func_t)(struct percpu_ref *);
@@ -331,8 +332,10 @@ static inline void percpu_ref_put_many(struct percpu_ref *ref, unsigned long nr)
if (__ref_is_percpu(ref, &percpu_count))
this_cpu_sub(*percpu_count, nr);
- else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count)))
+ else if (unlikely(atomic_long_sub_and_test(nr, &ref->data->count))) {
+ trace_ref_final_put(ref);
ref->data->release(ref);
+ }
rcu_read_unlock();
}
--
2.51.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
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Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2026-07-04 11:34 ` [PATCH 2/4] refcount: add ref_trace_final_put tracepoint Eugene Mavick
2026-07-04 11:34 ` [PATCH 3/4] percpu-refcount: add ref_trace_final_put trace Eugene Mavick
2026-07-04 23:19 [PATCH 0/4] tracing: add ref_trace_final_put tracing Eugene Mavick
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2026-07-05 0:36 [PATCH 0/4] tracing: add ref_trace_final_put tracing Eugene Mavick
2026-07-05 0:36 ` [PATCH 3/4] percpu-refcount: add ref_trace_final_put trace Eugene Mavick
2026-07-05 1:20 [PATCH 0/4] tracing: add ref_trace_final_put tracing Eugene Mavick via B4 Relay
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