Re: [uml-devel] Re: [RFC] PATCH 0/4 - Time virtualization

[john stultz <johnstul@us.ibm.com>]

On Thu, 2006-04-13 at 21:53 -0400, Jeff Dike wrote:
> On Thu, Apr 13, 2006 at 05:31:27PM -0700, john stultz wrote:
> > Looks interesting. I've never quite understood the need for different
> > time domains, it only allows you to run one domain with the incorrect
> > time, but I'm sure there is some use case that is desired.
> 
> There are a few possible answers -
> 
> If when this virtualization stuff is done, no one has done anything with
> time, someone is going to moan.

Apparently its like painting a wall then, no? 
"You missed those spots over there!"  :)


> Once in a while, you want to fiddle your system clock to make sure that
> a cron job or something does what it's supposed to.
> 
> There was some extra infrastructure that UML needed in order to start using
> this stuff, so I chose a fairly simple virtualization case to accompany it.
> 
> > I'm not psyched about possible namespace vs nanosecond confusion w/
> > terms like "time_ns", but that's pretty minor.
> 
> Yeah, names can be changed.

Well, as long as its pretty isolated its not such a big deal. Just
figured I'd bring it up as a consideration.

> > Also I hope you're not wanting to deal w/ NTP adjustments between
> > domains that have the incorrect time? That would be very ugly.
> 
> No, the domain stores an offset from the system time, so it automatically
> gets the system's NTP adjustments.

Ok, as long as you don't intend to go down that path, these patches
looks pretty harmless.

thanks
-john



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