linux-kernel - Re: [PATCH] serial: max310x: rework RX interrupt handling

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Message-ID: <CAHp75VdU5N6dBKgDudod+0cHumAreHCHgi1+xGqXtvpkiLNz0Q@mail.gmail.com>
Date:   Wed, 30 Sep 2020 17:54:15 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jan Kundrát <jan.kundrat@...net.cz>,
        Mark Brown <broonie@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH] serial: max310x: rework RX interrupt handling

On Wed, Sep 30, 2020 at 5:50 PM Thomas Petazzoni
<thomas.petazzoni@...tlin.com> wrote:
> On Wed, 30 Sep 2020 17:24:48 +0300
> Andy Shevchenko <andy.shevchenko@...il.com> wrote:

> > > On a Microchip SAMA5D3 platform that is receiving 20 bytes every 16ms
> > > over one MAX310X UART, this patch has allowed to reduce the CPU
> > > consumption of the interrupt handler thread from ~25% to 6-7%.
> >
> > Was it always like this?
>
> As far as I can see, yes. I guess you were thinking about a Fixes: tag
> perhaps? I don't think a Fixes: tag really applies here, as we're not
> fixing a performance regression.

Thanks for elaboration.

...

> > > +       /* Reset FIFOs*/
> >
> > Add a space before the asterisk.
>
> Indeed. Let me know if a v2 is needed, or if this small typo can be
> fixed when applying.

Greg usually doesn't touch commits, so v2 would be better.

-- 
With Best Regards,
Andy Shevchenko