Date: Mon, 19 Sep 2005 15:03:58 -0700 (PDT)
From: Christoph Lameter <clameter@engr.sgi.com>
To: tglx@linutronix.de
cc: linux-kernel@vger.kernel.org, mingo@elte.hu, akpm@osdl.org,
       george@mvista.com, johnstul@us.ibm.com, paulmck@us.ibm.com
Subject: Re: [ANNOUNCE] ktimers subsystem
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References: <20050919184834.1.patchmail@tglx.tec.linutronix.de>
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On Mon, 19 Sep 2005 tglx@linutronix.de wrote:

> sources. Another astonishing implementation detail of the current time 
> keeping is the fact that we get the monotonic clock (defined by POSIX as 
> a continous clock source which can not be set) by subtracting a variable 
> offset from the real time clock, which can be set by the user and 
> corrected by NTP or other mechanisms.

The benefit or drawback of that implementation depends which time is more 
important: realtime or monotonic time. I think the most used time value is 
realtime and not monotonic time. Having the real time value in xtime 
saves one addition when retrieving realtime. 
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