Answers to the questions about r39721 and r39723

[Dmitry Gorbachev]

Hi,
Alex Ionescu wrote:
>   This new hack directly slows down every context switch
> instead of every
>  page fault -- the latter is a less important perf hit. 
This slowdown is very small, especially when comparing with other
"Hack of Doom".
I just want to see, is it the only raison d'être of that old hack or not.
Aleksey Bragin wrote:
>   Why so, Dmitry? Looks like a hack? 
IopEnumerateDevice() loads drivers, but link in ArcName directory for
a boot device
should exist for it.