[PATCH v2 3/5] percpu-refcount: add ref_trace_final_put trace
From: Eugene Mavick via B4 Relay <devnull+m.mavick.dev@kernel.org>
Date: 2026-07-10 05:31:22
Also in:
b4-sent, linux-mm, lkml
Subsystem:
per-cpu memory allocator, the rest · Maintainers:
Dennis Zhou, Tejun Heo, Christoph Lameter, Linus Torvalds
From: Eugene Mavick <redacted> 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 <redacted> --- 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..f870ac0e8c06 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))) { + do_trace_ref_final_put(ref); ref->data->release(ref); + } rcu_read_unlock(); }
--
2.51.2