On Thursday 01 February 2007 12:46, Ingo Molnar wrote:
>
> * [email protected] <[email protected]> wrote:
>
> > Inter-CPU monotonicity can not, however, be guaranteed in a vsyscall,
> > so vsyscall is not used by default. [...]
>
> note that this is not actually the case. My patch below, ontop of -mm,
> implements a fully monotonic gettimeofday as an optional vsyscall
> feature.
>
> The 'price' paid for it is lower resolution - but it's still good for
> those benchmarking TPC-C runs - and /alot/ simpler. It's also quite a
> bit faster than any TSC based vgettimeofday, because it doesnt have to
> do an RDTSC (or RDTSCP) instruction nor any approximation of the time.
I believe that should be also a separate clock_gettime() CLOCK_
Global settings for these things are bad. Even if you run TPC-C you don't
want your other programs that rely on monotonic time to break.
-Andi
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