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SubjectRe: [PATCH RFC] sched: add notifier for process migration
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On Sat, 2009-10-10 at 11:05 +0200, Avi Kivity wrote:
> On 10/10/2009 09:14 AM, Peter Zijlstra wrote:
> > Why not do something like:
> >
> > struct {
> > u64 tsc;
> > u32 aux;
> > } tscp = rdtscp();
> >
> > local_time_info = timeinfo[tscp_cpu(tscp)];
> >
> > /* yay, consistent tsc and timeinfo !! */
> >
>
> First, not all processors support rdtscp.

Is that a real issue? If its not supported by the early hardware virt
chips, tough luck, they sucked anyway :-)

> Second, timeinfo might change
> at any time due to cpu frequency changes or the entire cpu being
> migrated, so we need to loop in any case.

Sure.


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