* Mark Lord <[email protected]> wrote:
> Ingo Molnar wrote:
> >Subject: [patch] sys_time() speedup
> >From: Ingo Molnar <[email protected]>
> >
> >improve performance of sys_time(). sys_time() returns time in seconds,
> >but it does so by calling do_gettimeofday() and then returning the
> >tv_sec portion of the GTOD time. But the data structure "xtime", which
> >is updated by every timer/scheduler tick, already offers HZ granularity
> >time.
>
> How well synchronized is xtime with real-time ?
it's updated by every jiffy.
> Programs invoking sys_time() do expect it to be as accurate as
> gettimeofday(), even if only at 1-second boundaries.
yes.
Ingo
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