linux-kernel - Re: [tip:timers/core] time: Add timekeeping_inject

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Message-ID: <alpine.LFD.2.02.1104300220040.3005@ionos>
Date:	Sat, 30 Apr 2011 02:23:54 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Arve Hjønnevåg <arve@...roid.com>
cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	john.stultz@...aro.org, arnd@...db.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/core] time: Add timekeeping_inject_sleeptime

On Fri, 29 Apr 2011, Arve Hjønnevåg wrote:
> On Fri, Apr 29, 2011 at 10:31 AM, tip-bot for John Stultz
> <john.stultz@...aro.org> wrote:
> > -       set_normalized_timespec(&time,
> > -                               newtime + delta.tv_sec,
> > -                               (NSEC_PER_SEC >> 1) + delta.tv_nsec);
> > -       do_settimeofday(&time);
> > +       /* subtract kernel time between rtc_suspend to rtc_resume */
> > +       time = timespec_sub(time, timespec_sub(newts, oldts));
> 
> The delta you got from the rtc can be almost a second to long or
> short. Do you do anything to prevent these errors from accumulating?

By using the the magic crystal ball to avoid it or what do you have in
mind ?

Thanks,

	tglx