linux-kernel - Re: Question on timekeeping subsystem

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Message-Id: <200802140237.51499.zippel@linux-m68k.org>
Date:	Thu, 14 Feb 2008 02:37:51 +0100
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	"Francis Moreau" <francis.moro@...il.com>
Cc:	linux-kernel@...r.kernel.org, johnstul@...ibm.com
Subject: Re: Question on timekeeping subsystem

Hi,

On Wednesday 13. February 2008, Francis Moreau wrote:

> First I tried to find some documentation on the current implementation
> but haven't found any thing really usefull. Specially there's nothing about
> it in Documentation/ directory. Please correct me if I'm already wrong.
>
> Actually I read the implementation of update_wall_time() and I really fail
> to understand how it works. This is probably because I don't know
> what "xtime_nsec" and "error" fields in clocksource struct are for.
> These fields are not documented anywhere in the source code so it
> should be obvious but unfortunately not for me.

These mails should help to understand, what this code does:

http://lkml.org/lkml/2006/3/4/61
http://lkml.org/lkml/2006/4/3/205

bye, Roman
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