linux-kernel - Re: [PATCH 08/10] x86, xen, mm: fix mapping_pagetable

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Date:	Tue, 09 Oct 2012 22:15:02 +0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH 08/10] x86, xen, mm: fix mapping_pagetable_reserve logic

On 10/09/2012 08:22 PM, Stefano Stabellini wrote:
> 
> I can give some hints: find_early_table_space allocates more memory than
> needed for pagetable pages, the allocated range is
> pgt_buf_start-pgt_buf_top.
> 

This is why I keep telling you that we should *get rid of*
find_early_table_space and instead build the page tables incrementally.
 There simply is no sane way to make find_early_table_space or anything
else that requires pre-calculating the page table sizes to work and be
robust.

	-hpa

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