linux-kernel - Re: [PATCH v2 1/2] ring-buffer: Introducing ring-buffer mapping functions

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Message-ID: <20230329091429.03d52dcc@rorschach.local.home>
Date:   Wed, 29 Mar 2023 09:14:29 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Vincent Donnefort <vdonnefort@...gle.com>
Cc:     mhiramat@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH v2 1/2] ring-buffer: Introducing ring-buffer mapping
 functions

On Wed, 29 Mar 2023 14:10:09 +0100
Vincent Donnefort <vdonnefort@...gle.com> wrote:

> The v2 of this series only updates the head page in the update ioctl
> (ring_buffer_update_meta_page()) Couldn't find a nice way around that as it can
> be either updated by the reader or the writer. So the best solution seemed a
> call to set_head_page().

Yes, the update will race between readers and writers. Let's not worry
about this at the moment and not expose it yet. I'm looking at other
ways around this too.

-- Steve