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s=MBO0001; t=1783744880; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+WpDJUffFYkGym8OqsSvgqtunStF+Lue8wI1l/VKbI4=; b=Q09mZMDBC3SL2Aw+Qz9LF/nU3tBPOXtA6NdSL96a1e8e8dmySvxy5+Cfav+dkJpUXt22Pi JeN7JHaUTsAqERdODP154c/17aUIO4dKH5MAOuelbkZ5GEFW/i/NKgj/6WlHcW5FpM7uhO i5rLjrNn5a1pz1g3kA1r7mTnhShvmN8lxPAHrUDN+EQafdh5oIfunKkvPD2J+x563LjEOP JRPVKmM3yFLQFzjsRSNWLx2atapc2C4jCSyRqf8Rssc7+dM7+qz1NnnVqBitsri7r/WL+X jRVuFMDF3MjMzuovC779vCM5SA7B8CbytS+qTUxu67X96SFDqcx+jN4JTGBedg== From: Eugene Mavick Date: Sat, 11 Jul 2026 12:40:21 +0800 Subject: [PATCH v3 3/5] percpu-refcount: add ref_trace_final_put trace MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260711-refcount-final-put-trace-v3-3-674c8f03d9f9@mavick.dev> References: <20260711-refcount-final-put-trace-v3-0-674c8f03d9f9@mavick.dev> In-Reply-To: <20260711-refcount-final-put-trace-v3-0-674c8f03d9f9@mavick.dev> 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@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, Eugene Mavick X-Developer-Signature: v=1; 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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 --- 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 #include #include +#include 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