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SubjectHZ from userspace

I want to be able to convert starttime from /proc/#/stat to absolute
time and it seems that I need HZ to do that as it is measured in
jiffies. How can I get HZ? I have seen some discussion about this but
haven't found a definite answer. procps is using some hacks do it and
I would prefer to avoid them.
I only need a solution for modern kernels, say 2.6.20+ if that matters.

Best Regards,
Piotr Jaroszyński
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