linux-kernel - Re: [PATCH 07/10] bootmem: add free_bootmem

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Date:	Mon, 16 Nov 2009 11:27:14 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Pekka Enberg <penberg@...helsinki.fi>, Tejun Heo <tj@...nel.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, chrisw@...s-sol.org,
	dwmw2@...radead.org, Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH 07/10] bootmem: add free_bootmem_late

On Sun, Nov 08, 2009 at 10:57:19AM +0100, Ingo Molnar wrote:

> Page tables is the main dependency. x86 boots with a limited set of page 
> tables, the real ones are set up later.
> 
> We'd need to see what bootmem allocations are done before page table 
> init in practice. I think i did such tests a few years ago and i think 
> it's rather limited (if it happens at all).
> 
> If that's mapped out we can just convert x86 to an 'emulated' bootmem 
> allocator: buddy and slab is set up right when pagetables are set up, 
> and bootmem can just use kmalloc.

That sounds like a good idea. But keep in mind that support for 1GB
pages currently depends on the bootmem allocator because the buddy
system can not allocate 1GB of physically contiguous memory.
But I think this could also be handled from x86 arch code without the
bootmem allocator.

	Joerg


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