linux-kernel - Re: [RFC][patch 10/12] move NTP adjusted clock multiplier to struct timekeeper

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Message-ID: <20090803100209.29431638@skybase>
Date:	Mon, 3 Aug 2009 10:02:09 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	john stultz <johnstul@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Walker <dwalker@...o99.com>
Subject: Re: [RFC][patch 10/12] move NTP adjusted clock multiplier to struct
 timekeeper

On Fri, 31 Jul 2009 16:32:58 -0700
john stultz <johnstul@...ibm.com> wrote:

> On Fri, 2009-07-31 at 11:00 +0200, Martin Schwidefsky wrote:
> > How about this definition for struct timekeeper?
> > 
> > /* Structure holding internal timekeeping values. */
> > struct timekeeper {
> >         /* Current clocksource used for timekeeping. */
> >         struct clocksource *clock;
> >         /* The shift value of the current clocksource. */
> >         int     shift;
> > 
> >         /* Number of clock cycles in one NTP interval. */
> >         cycle_t cycle_interval;
> >         /* Number of clock shifted nano seconds in one NTP interval. */
> >         u64     xtime_interval;
> >         /* Raw nano seconds accumulated per NTP interval. */
> 
> I might just use the term "accumulation interval"  instead of NTP
> interval. This isn't something that's strictly connected to NTP, other
> then they both just need to have some chunk of time that we use as an
> comparative interval.

Acuumulation interval is more generic but it IS the NTP interval, no?
Do we plan to ever use something different than the NTP interval? 

> >         u32     raw_interval;
> > 
> >         /* Clock shifted nano seconds remainder not stored in xtime.tv_nsec. */
> >         u64     xtime_nsec;
> >         /* Difference between accumulated time and NTP time in ntp
> >          * shifted nano seconds. */
> >         s64     ntp_error;
> >         /* Shift conversion between clock shifted nano seconds and
> >          * ntp shifted nano seconds. */
> >         int     ntp_error_shift;
> >         /* NTP adjusted clock multiplier */
> >         u32     mult;
> > };
> 
> Other then that it looks good to me!

Ok, I'll update the patches.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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