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TLB entries > 4kb

To: linux-kernel@vger.rutgers.edu, linux@cthulhu.engr.sgi.com
Subject: TLB entries > 4kb
From: ralf@uni-koblenz.de
Date: Thu, 12 Feb 1998 05:56:48 +0100
Sender: owner-linux@cthulhu.engr.sgi.com
Some architectures can use multiple page sizes in the TLB at the same time.
This would for example allow to map memory allocations > PAGE_SIZE using just
a single TLB entry if the circumstances are just right, thereby
reducing / eleminating TLB trashing.  This should improve the performance
for huge apps quite a bit.  Some architectures could partially get rid of
the sick effects of their virtual indexed primary caches as well.  All that
is needed for this to work is to have sufficiently large physical pages with
sufficient alignment at hand.

Has anybody ever looked into implementing that?  What architectures besides
MIPS could take advantage of such a feature?

  Ralf

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