Re: [PATCH 4/10] alternate 4-level page tables patches

[Linus Torvalds <torvalds@osdl.org>]

On Sat, 18 Dec 2004, William Lee Irwin III wrote:
> 
> On Sat, Dec 18, 2004 at 09:23:06PM -0800, Linus Torvalds wrote:
> > We need to (and do) flush the TLB on ASID re-use, regardless. That's true
> > in any case. 
> 
> If it's already been audited and there's nothing to do, all the better.

It's more an issue of "if they don't, it won't work". 

That should be true at least for the "traditional" kind of ASI's, where
the ASI space is smaller than the process space, and ASI's get re-used
while a process is live anyway.

Of course, who knows what evil things the ppc external hash does with the 
thing. 

Anyway, I don't think we should necessariyl remove the flush entirely, and
the simple one-liner only did the "immediate free" thing without the
complex "batch things up and free them only after a flush".

		Linus
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