Message-ID: <406F3F2D.20301@quark.didntduck.org>
Date: Sat, 03 Apr 2004 17:48:13 -0500
From: Brian Gerst <bgerst@didntduck.org>
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To: Matt Mackall <mpm@selenic.com>
CC: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org,
       Zwane Mwaikambo <zwane@linuxpower.ca>
Subject: Re: [PATCH] more i386 head.S cleanups
References: <406ECAE7.1020407@quark.didntduck.org> <20040403160226.GY6248@waste.org>
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Matt Mackall wrote:
> On Sat, Apr 03, 2004 at 09:32:07AM -0500, Brian Gerst wrote:
> 
>>- Move empty_zero_page and swapper_pg_dir to BSS.  This requires that 
>>BSS is cleared earlier, but reclaims over 3k that was lost due to page 
>>alignment.
>>- Move stack_start, ready, and int_msg, boot_gdt_descr, idt_descr, and 
>>cpu_gdt_descr to .data.  They were interfering with disassembly while in 
>>.text.
> 
> 
> Nice. Do you mean 3k here or 0x3000? 

3 kilobytes apporiximately.  Most of the first page was wasted because 
swapper_pg_dir aligns to the start of the next page.

> 
> On a related note, I've been sitting on this patch which reorders the
> bootstrap code so we can free most of it once we're up:
> 

The bootstrap page tables can easily be reclaimed if large pages are 
used, but the bootstrap code needs more care, especially with hotplug cpus.

--
				Brian Gerst
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