From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: 30 Sep 2002 14:15:50 +0100
Because I was looking over the gettimeoffset code and forgot that
gettimeofday itself takes the xtime_lock 8)
It used to be possible to implement this lockless using a $(sizeof
xtime)-bit load. But once you start adding complications such as
wall_jiffies, it isn't feasible anymore.
The next idea is to have a tick cookie that could later be converted
to/from a full timeval. This trick doesn't work on things like Alpha
where the guarenteed life of the tick is only 6 seconds or something
like that.
Most of the time the timestamp isn't even used.
If someone can propose other ideas I'm ready and listening :-)
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