Avoid reading /sys/kernel/mm/transparent_hugepage/?

[Florian Weimer]

* H. J. Lu:

> To enable THP segment load, ld.so opens and reads 2 files under
> /sys/kernel/mm/transparent_hugepage/.   This requires mounting
> /sys and is expensive.   Is it possible to put such info in vDSO?

Alexey Dobriyan proposed adding AT_PAGE_SHIFT_LIST to the auxiliary
vector a while back, but I don't know the status of that.

Thanks,
Florian