Speed up trace mode

[Mihir Luthra]

>
> Hi Clemens,

I have added a readme to the repository with the latest updates.[1]
I have attempted to explain the code the best I could.

The code functions correctly in the macports-base for the 57 ports that I
tested.[2]
The speed improvements are decent as per me. In real I don’t know the
expectations so can’t comment on how good it is.

Also, if there is anything I can do other than readme, please let me know.

[1] https://github.com/MihirLuthra/dtsharedmemory
[2] https://github.com/MihirLuthra/macports-base/tree/dtsm-darwintrace

Regards,
Mihir
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