linux-kernel - Re: [RFC PATCH] tracing: ring_buffer: Rewind persistent ring buffer when reboot

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Message-ID: <20250513203647.524b1331@gandalf.local.home>
Date: Tue, 13 May 2025 20:36:47 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] tracing: ring_buffer: Rewind persistent ring buffer
 when reboot

On Tue, 13 May 2025 20:32:37 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> @@ -9628,6 +9636,14 @@ static void setup_trace_scratch(struct trace_array *tr,
>  
>  	/* Scan modules to make text delta for modules. */
>  	module_for_each_mod(make_mod_delta, tr);
> +
> +	/* Set trace_clock as the same of the previous boot. */
> +	if (tscratch->clock_id != tr->clock_id) {
> +		if (tracing_set_clock(tr, trace_clocks[tscratch->clock_id].name) < 0) {
> +			pr_info("the previous trace_clock info is not valid.");
> +			goto reset;
> +		}
> +	}
>  	return;
>   reset:
>  	/* Invalid trace modules */


Hmm, somehow I got your other patch in here :-D

-- Steve