linux-kernel - Re: [PATCH] x86: put initial_pg

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Message-ID: <49B7164E.3020505@goop.org>
Date:	Tue, 10 Mar 2009 18:39:26 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: put initial_pg_tables into .bss -v4

H. Peter Anvin wrote:
> Yinghai Lu wrote:
>   
>> it just estimates initial_pg_tables size, and make _end a little bigger (1M), so boot loader could have idea of correct size of vmlinux aka the uncompressed size of in kernel.
>>
>> I assume brk patches could estimate the extra size that it needs too.
>>
>>     
>
> Yes, and I have made that point several times in this thread already.
>
> I really like the brk interface because it's a clean, general-purpose 
> allocator.
>
> We can create a brk segment in vmlinux (and even bound the brk to catch 
> overflows, instead of randomly failing) to advertise the presence of the 
> brk.
>   

I have a patchset to do exactly this in testing; I'll try to mail it out 
later this evening.  Its very similar (including reserving 1MB after the 
end of the bss variables, in the bss section).

    J
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