linux-kernel - Re: [PATCH v6 1/4] tracing: Reset last_boot

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Message-ID: <20260204204049.0f7dc697@robin>
Date: Wed, 4 Feb 2026 20:40:49 -0500
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: [PATCH v6 1/4] tracing: Reset last_boot_info if ring buffer is
 reset

On Sun,  1 Feb 2026 12:29:07 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> @@ -8036,6 +8042,7 @@ tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt,
>  				tracing_reset_online_cpus(&tr->max_buffer);
>  			else
>  				tracing_reset_cpu(&tr->max_buffer, iter->cpu_file);
> +			update_last_data_if_empty(tr);

Is this needed? Memory mapped buffers (which the persistent ring buffer
is) do not have snapshot buffers.

-- Steve


>  		}
>  		break;
>  	}