Re: Voyager subarchitecture for 2.5.46

Pavel Machek (pavel@suse.cz)
Sun, 10 Nov 2002 20:42:04 +0100


Hi!

> > I believe you need to *store* last value given to userland.
>
> But that's trivially done: it doesn't even have to be thread-specific, so
> it can be just a global entry anywhere in the process data
> structures.

> This is just a random sanity check thing, after all. It doesn't have to be
> system-global or even per-cpu. The only really important thing is that
> "gettimeofday()" should return monotonically increasing data - and if it
> doesn't, the vsyscall would have to ask why (sometimes it's fine, if
> somebody did a settimeofday, but usually it's a sign of trouble).

I believe you need it system-global. If task A tells task B "its
10:30:00" and than task B does gettimeofday and gets "10:29:59", it
will be confused for sure.
Pavel

-- 
Casualities in World Trade Center: ~3k dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.
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