> Linus Torvalds wrote:
> > So I've considered having a magic user-mapped page for quite some time,
> > because we have several of these cases where the kernel can generate code
> > at run-time to its own advantage. The sysenter thing is just an obvious
> > extension to this - allowing the kernel to generate whatever entry
> > sequence is the best for that particular CPU.
>
> Talking about "magic user-mapped pages": Some things like "getpid ()"
> are horrendously more inefficient than they need be. If there was a
> magic kernel-page that the user-app has read access to, then these
> calls would become enormously more efficient.
And there goes any talk about not screwing TLB over this thing...
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