Messages in this thread |  | | Date | Tue, 30 Oct 2001 08:38:31 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: please revert bogus patch to vmscan.c |
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On Tue, 30 Oct 2001, Rik van Riel wrote: > > Only on architectures where the TLB (or equivalent) is > small and only capable of holding entries for one address > space at a time. > > It's simply not true on eg PPC.
Now, it's not true on _all_ PPC's.
The sane PPC setups actually have a regular soft-filled TLB, and last I saw that actually performed _better_ than the stupid architected hash- chains. And for the broken OS's (ie AIX) that wants the hash-chains, you can always make the soft-fill TLB do the stupid thing..
(Yeah, yeah, I'm sure you can find code where the hash-chains are faster, especially big Fortran programs that have basically no tear-down and build-up overhead. Which was why those things were designed that way, of course. But it _looks_ like at least parts of IBM may finally be wising up to the fact that hashed TLB's are a stupid idea).
Linus
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