linux-kernel - Re: [PATCH 2/2] drivers/clocksource/fttmr010: Implement delay timer

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Message-ID: <CACRpkdZwDpS_GrWTpZYK56YyTMnWjmEU_7fg-mPp3AA3+k6mMQ@mail.gmail.com>
Date:   Tue, 13 Jun 2017 11:18:21 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Jonas Jensen <jonas.jensen@...il.com>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joel Stanley <joel@....id.au>,
        Janos Laube <janos.dev@...il.com>,
        Paulius Zaleckas <paulius.zaleckas@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>
Subject: Re: [PATCH 2/2] drivers/clocksource/fttmr010: Implement delay timer

On Mon, Jun 12, 2017 at 2:41 PM, Jonas Jensen <jonas.jensen@...il.com> wrote:

> I stumbled upon boot time savings (going from next-20170518 to
> next-20170609) which seem to shave off more than a second ([1]
> compared to [2]) so I also booted without patches ([3]).
> There seems to be improvement when these patches are applied.

Oh yes, using delay timers saves us the loop calibration time.

Actually I should mention that, it's pretty nice.

Thanks for testing!

Yours,
Linus Walleij