From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AEA08407CC2; Wed, 20 May 2026 18:49:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779303003; cv=none; b=ikXzCI04cAdqe2/iDDIcl2fHAQ7eyLYdINCM1oY0e0rH1YvtW4AX84Wyj4mIzV7u9OKejOdW8EsWoEt3ElYA7Nhj8+RWW/2MGDwZyDo9VzzhkDo+OTIL2ZT3WdaIspi//+ZF4MAUhwAxE33P8Vri+QJj38UeV2J8U6Uk9F1ychY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779303003; c=relaxed/simple; bh=z5SVxvOPWouWAEsykNXiPrhwQD4I2e6zBCMpbO6NQ9A=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=tcDxdO4J8mUX1sauIcaTRkh9vFpXUiUlmkaVJoC2z253LtoKzNcm6gOA4jgYmfGHcHyyUWhjzLVue6u4wXJeNpOSMJmDUUEdhu5VWrqozu/0Zdu5TWDMWW6L8Gf9r21qdVJIizIPmfbBiiuf0B/msqffWk+ZDrv56wE0fW371lo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ozSb5z9q; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ozSb5z9q" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1BF1C1F00896; Wed, 20 May 2026 18:49:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779302998; bh=+qxY6XO6xH+KHvQWKy6geEKa64zKIpoMCS+55NWFVSc=; h=Date:From:To:Cc:Subject:References; b=ozSb5z9q16eUCBHQB6MbRFTNnaxfl/aNu8zF1u4eFQD0k0p/rz3LQnVg2ezUINV08 Se0JfWZd/eXjEbvPKD4B2u0sZCGN6M/kyhQZneP4uYyRPOdkKj14oKp+DuZiXhaKKZ SXfXtrwkPBAYHnGAMEmFH/CkwVcrAPCyX7B90/XoGH6MSS3+tRA9QtV5F9FNZLj6F7 eX/Ywb5DTfnQVpHBBaEm2LrAdpWNPbZvOZ+kWBV7E71oCBipETqV9ITVoOQPW2KJon rxOJZTSwBBmAM1mnon9Z1DBzXWAjuA2eWI985d/RltgDIMOjK3vCUduUwSLPRnpZJq izxLZllN+jNDA== Received: from rostedt by gandalf with local (Exim 4.99.2) (envelope-from ) id 1wPlzl-00000004qSK-32du; Wed, 20 May 2026 14:50:17 -0400 Message-ID: <20260520185017.589985000@kernel.org> User-Agent: quilt/0.69 Date: Wed, 20 May 2026 14:49:42 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mathieu Desnoyers , Catalin Marinas , Will Deacon , Ian Rogers Subject: [PATCH v20 04/10] ring-buffer: Show commit numbers in buffer_meta file References: <20260520184938.749337513@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 From: "Masami Hiramatsu (Google)" In addition to the index number, show the commit numbers of each data page in the per_cpu buffer_meta file. This is useful for understanding the current status of the persistent ring buffer. (Note that this file is shown only for persistent ring buffer and its backup instance) Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt --- kernel/trace/ring_buffer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index ce645ca8425d..695398d72fbb 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2224,6 +2224,7 @@ static int rbm_show(struct seq_file *m, void *v) struct ring_buffer_per_cpu *cpu_buffer = m->private; struct ring_buffer_cpu_meta *meta = cpu_buffer->ring_meta; unsigned long val = (unsigned long)v; + struct buffer_data_page *dpage; if (val == 1) { seq_printf(m, "head_buffer: %d\n", @@ -2236,7 +2237,9 @@ static int rbm_show(struct seq_file *m, void *v) } val -= 2; - seq_printf(m, "buffer[%ld]: %d\n", val, meta->buffers[val]); + dpage = rb_range_buffer(cpu_buffer, val); + seq_printf(m, "buffer[%ld]: %d (commit: %ld)\n", + val, meta->buffers[val], dpage ? local_read(&dpage->commit) : -1); return 0; } -- 2.53.0