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SubjectRe: [PATCH] time : SMP friendly alignment of struct clocksource
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On Tue, 2007-03-20 at 10:58 -0700, john stultz wrote:

> > /* timekeeping specific data, ignore */
> > - cycle_t cycle_last, cycle_interval;
> > - u64 xtime_nsec, xtime_interval;
> > + cycle_t cycle_interval;
> > + u64 xtime_interval;
> > + /*
> > + * Second part is written at each timer interrupt
> > + * Keep it in a different cache line to dirty no
> > + * more than one cache line.
> > + */
> > + cycle_t cycle_last ____cacheline_aligned_in_smp;
> > + u64 xtime_nsec;
> > s64 error;

What was the motivation for having these (cycle_last for example) in the
clocksource structure. I recall them being added in there at one point,
but I'm not sure why.. Specifically the ones that are updated often.

Daniel

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