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Message-Id: <200711161216.46733.ak@suse.de>
Date: Fri, 16 Nov 2007 12:16:46 +0100
From: Andi Kleen <ak@...e.de>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: William Lee Irwin III <wli@...omorphy.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>,
Nick Piggin <nickpiggin@...oo.com.au>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Why preallocate pmd in x86 32-bit PAE?
> I think Jeremy's question was due to trying to reduce the 32/64-bit
> differences. Performance-wise, it might add a small amount to user
> setup time (a typical 32-bit process will need all four, for the main
> binary, libraries, stack and kernel, respectively)
With the new top down mmap layout and standard 3:1 split it should typically
only need two.
-Andi
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