Re: [PATCH 00/18] Make common x86 arch area for i386 and x86_64 - Take 2

David Miller
2007-03-16T20:55:48Z

From: Christoph Lameter <clameter@sgi.com>
Date: Fri, 16 Mar 2007 13:52:18 -0700 (PDT)

> Virtual mmap allows holes in the same way as page tables do.

I don't want to take expensive TLB misses to lookup a page.

Don't force a virtual mapping solution down my throat if that
is not what I believe as a platform maintainer works best
for me.

TLB misses are extremely expensive on some platforms, that's why
I try to make all the critical structures go through the 4MB
locked TLB entry for the kernel image, or failing that the
4MB linear mappings at PAGE_OFFSET on sparc64.