linux-kernel - Re: Why preallocate pmd in x86 32-bit PAE?

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Message-ID: <473DC10B.5000702@zytor.com>
Date:	Fri, 16 Nov 2007 08:10:51 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...e.de>
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?

Andi Kleen wrote:
> On Friday 16 November 2007 16:45:16 H. Peter Anvin wrote:
>> Andi Kleen wrote:
>>>> 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.
>>>
>> Well, three with the kernel.
> 
> I didn't count kernel because it is always fixed anyways and about zero
> overhead for the normal setup case.
> 

Of course, but it was in the original list so...

	-hpa
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