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xen-ia64-devel
RE: [Xen-ia64-devel] Question about migration
Kouya Shimura wrote:
> Xu, Anthony writes:
>> You are right here, if migration happens in the same machine,
>> How about migrate to another physical machine?
>> There may be different ITC value in different machine.
>
> I tried it. Actually far ITC jumping has occurred.
> This could happen in domain save/restore also.
>
> But the monotonicity of system time (gettimeofday) is guaranteed.
> that seems to be done in:
> time_resume()@linux-2.6.18-xen.hg/arch/ia64/kernel/time.c.
If application uses gettimeofday , there is no issue.
While if application read ITC directly, (in theory, it can), we have
trouble.
Anthony
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