linux-kernel - Re: [PATCH] [30/30] x86_64: Add missing !X86

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Message-ID: <20070501051155.GS19966@holomorphy.com>
Date:	Mon, 30 Apr 2007 22:11:55 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <ak@...e.de>, Mark Lord <lkml@....ca>,
	ebiederm@...ssion.com, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [30/30] x86_64: Add missing !X86_PAE dependincy to the 2G/2G split.

William Lee Irwin III a ?crit :
>> There's some sort of insanity going on here. Since when is 0x78000000
>> a 2GB/2GB split? Mark, dare I ask what you were thinking? That should
>> be VMSPLIT_2G_OPT for 2GB laptops analogously to VMSPLIT_3G_OPT, if
>> nothing else, as it's certainly not 2GB/2GB.

On Tue, May 01, 2007 at 06:57:19AM +0200, Eric Dumazet wrote:
> Please could you stop saying others are insane ?
> They are like you and can fail sometime. Apparently when the patch came, 
> nobody (including you) commented.
> It's not that difficult to think about VMALLOC space (I might be wrong 
> about this, but I feel this explains 78000000 vs 80000000)

I'm obviously aware of vmallocspace. Read carefully:

    >> a 2GB/2GB split? Mark, dare I ask what you were thinking? That should
    >> be VMSPLIT_2G_OPT for 2GB laptops analogously to VMSPLIT_3G_OPT, if
    >> nothing else, as it's certainly not 2GB/2GB.

The meaning of "for laptops" is that it's carving out a chunk of
user virtualspace to use for vmallocspace in lieu of carving out a
piece of the 1:1 mapping of physical memory for the same purpose.


-- wli
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