linux-kernel - Re: brk patches..

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Message-ID: <49AB3377.40904@goop.org>
Date:	Sun, 01 Mar 2009 17:16:39 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: brk patches..

H. Peter Anvin wrote:
> If the brk is bounded-size on the same order or smaller as the kernel,
> we should just mark it as an unallocated (bss) section in the ELF image
> and be done with it... there really is no point in trying to be smarter
> (we'd be subject to failures to load the kernel proper.)  If the brk is
> significantly bigger, then yes, we need to be smarter.  However, that is
> not my current understanding of the requirements.
>   

Yes, right.  And in my case I actually need it to generate an 
appropriate e820 table, so adding a dependency on e820 would be circular...

(To be specific: I reshape the guest e820 table so that it doesn't have 
memory in any forbidden areas of the host e820 table.  That may require 
moving the pseudo-physical address of pages into a new overflow e820 
entry, which would also require allocating pages for the p2m radix tree.)

    J
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