Speed up trace mode (GSoC Project)

[Mihir Luthra]

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> From what I understand from the stackoverflow post you're right that
> cmxpchg16b will not give a consistent view of the 16 bytes of memory
> across multiple NUMA nodes. However, maybe two 4 byte values right next
> to each other would be sufficient for your use case and could then be
> casted to a 8 byte values for CAS?
>

Thats a great idea. The offset shall never go out of range of 4 byte but
still I will put a check there for ensuring. I will update you when I am
done with testing on main base code.

Regards,
Mihir
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