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

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Date:	Fri, 16 Mar 2007 13:55:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	clameter@....com
Cc:	andi@...stfloor.org, rostedt@...dmis.org,
	torvalds@...ux-foundation.org, mbligh@...igh.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	chrisw@...s-sol.org, rusty@...tcorp.com.au, glommer@...il.com
Subject: Re: [PATCH 00/18] Make common x86 arch area for i386 and x86_64 -
 Take 2

From: Christoph Lameter <clameter@....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.
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