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Thank you @k82cn! Actually your issue reminded me of #4318 -- an issue that's still open, focused on how under-documented the syscall package is. I believe that if we had documented it, you'd easily get the answer.
If interested in helping to solve that issue, once you get some answers, please feel free to send some patches documenting syscall.SysInfo and the struct; it would be a great contribution for future self and to others, we'll be grateful.