Messages in this thread | | | Date | Sun, 10 Nov 2002 11:31:45 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: Voyager subarchitecture for 2.5.46 |
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On Sun, 10 Nov 2002, Pavel Machek wrote: > > 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).
But yes, it's certainly a lot more complex than just doing it in a controlled system call environment. Which is why I think vsyscalls are eventually not worth it.
Linus
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