X86_DS config option needs better help text

[Roland Dreier]

Noticed while building a new kernel from latest git:

    Debug Store support (X86_DS) [Y/n/?] (NEW) ?

and asking for help just gives

    Add support for Debug Store.
    This allows the kernel to provide a memory buffer to the hardware
    to store various profiling and tracing events.

This doesn't really let me decide if I want it or not.  Is there a cost
to enabling this, and if so what?  What new feature does this give me?

Is there even a point to making this a user-visible option at all, or
should it just be an internal config variable selected by X86_PTRACE_BTS
and any future users of this?

X86_PTRACE_BTS also could use an improved help text.

No patch, sorry, since I don't actually know for sure what this does.

Thanks,
  Roland
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