linux-kernel - Re: [PATCH v1] regmap: introduce value tracing for regmap bulk operations

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Message-ID: <Yv5eMcmNOmyLmd++@sirena.org.uk>
Date:   Thu, 18 Aug 2022 16:43:45 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Dmitry Rokosov <DDRokosov@...rdevices.ru>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "linux@...musvillemoes.dk>" <linux@...musvillemoes.dk>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        kernel <kernel@...rdevices.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] regmap: introduce value tracing for regmap bulk
 operations

On Thu, Aug 18, 2022 at 02:49:20PM +0100, Marc Zyngier wrote:

> I don't care much about regmap as a MMIO backend, but it strikes me as
> odd that you end up with multiple ways of logging the same stuff (with
> a memcpy in the middle of it).

> Why can't this be done with a small amount of trace post-processing?

At the minute we don't put the actual data for the bulk transfers into
the trace so the information simply isn't there.

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