From: Andi Kleen <ak@suse.de>
Organization: SUSE Linux Products GmbH, Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg)
To: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Why preallocate pmd in x86 32-bit PAE?
Date: Fri, 16 Nov 2007 12:16:46 +0100
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Cc: William Lee Irwin III <wli@holomorphy.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Jeremy Fitzhardinge <jeremy@goop.org>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>,
       Nick Piggin <nickpiggin@yahoo.com.au>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <473CC0AC.3020500@goop.org> <20071116004012.GE1806@holomorphy.com> <473CE72C.4060209@zytor.com>
In-Reply-To: <473CE72C.4060209@zytor.com>
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> 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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