linux-kernel - Re: [PATCH v3 1/2] tracing: ring_buffer: Rewind persistent ring buffer when reboot

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Message-ID: <20250527094849.49e56eaa@gandalf.local.home>
Date: Tue, 27 May 2025 09:48:49 -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: [PATCH v3 1/2] tracing: ring_buffer: Rewind persistent ring
 buffer when reboot

On Mon, 26 May 2025 12:44:03 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> > 
> > Now the question is, can this affect the persistent ring buffer too? I'll
> > memory map the buffer and see if it causes the same issue.  
> 
> Yeah, it can happen, but I didn't hit that.
> Let me test it too.
> 
> Hmm, BTW, is there any possible solution? records the consumed
> bytes in meta data?

After memory mapping the main buffer, I found a couple of bugs. I'll have
the fixes out shortly.

-- Steve