Re: Problem with 1G RAM

David S. Miller (
Fri, 4 Dec 1998 15:09:18 -0800

From: Perry Harrington <>
Date: Fri, 4 Dec 1998 14:58:51 -0800 (PST)

Does any of this make sense? Or am I just off my rocker? I thought
of dynamicising PAGE_OFFSET for x86, but I figured that Linus, et
al, would have a fit over performance.

Look at the BTFIXUP stuff we do on sparc32 to see another idea of how
to taper off most of the performance problems assosciated with a
dynamic PAGE_OFFSET. (TASK_UNMAPPED_BASE was a real killer before we
added the BTFIXUP stuff, it put a divide into a critical path).

David S. Miller

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