Messages in this thread | | | Date | Tue, 26 Jun 2007 16:58:25 +0200 | From | Ingo Molnar <> | Subject | Re: [patch, v2.6.22-rc6] sys_time() speedup |
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* Mark Lord <lkml@rtr.ca> wrote:
> Ingo Molnar wrote: > >Subject: [patch] sys_time() speedup > >From: Ingo Molnar <mingo@elte.hu> > > > >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.
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