Date: Tue, 10 Jan 2006 15:21:51 +0100
From: Jens Axboe <axboe@suse.de>
To: Gerd Hoffmann <kraxel@suse.de>
Cc: Mikael Pettersson <mikpe@csd.uu.se>, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>
Subject: Re: 2G memory split
Message-ID: <20060110142151.GI3389@suse.de>
References: <20060110125852.GA3389@suse.de> <17347.47882.735057.154898@alkaid.it.uu.se> <20060110135404.GF3389@suse.de> <43C3C023.9040308@suse.de>
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On Tue, Jan 10 2006, Gerd Hoffmann wrote:
>   Hi,
> 
> >0xb0000000 is a much better default, but I didn't think that would fly
> >as a patch.
> 
> I think that will not fly with CONFIG_X86_PAE.  In PAE mode the 3rd pmd 
>  (for the 0xc0000000 => 0xffffffff kernel address range) is shared, 
> anything but 0xc000000 most likely needs some more hackery than just 
> changing PAGE_OFFSET.  As the whole point of this split patchery is to 
> avoid highmem in the first place it maybe makes sense to have some 
> "optimize for 1/2/4/more GB main memory" config option which in turn 
> picks sane PAGE_OFFSET+HIGHMEM+PAE settings?

The patch depends on NOHIGHMEM atm, so you can't select PAE and move the
page offset anyways.

-- 
Jens Axboe

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