Re: [PATCH] per-cpu areas for 2.5.3-pre6

[Linus Torvalds]

On Tue, 29 Jan 2002, Oliver Xymoron wrote:
>
> Seems like we could do slightly better to have these local areas mapped to
> the same virtual address on each processor, which does away with the need
> for an entire level of indirection.

No no no.

That is a really stupid idea, even though every single OS developer has at
some time thought that it was the great idea (and it shows up in a lot of
OS's).

The reason it is a stupid idea is that if you do it, you can no longer
share page tables between CPU's (unless all CPU's you support have TLB
fill in software).

		Linus