Re: [PATCH] more i386 head.S cleanups

[Brian Gerst]

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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