linux-kernel - Re: [RFC] Reverting NUMA-affine page table allocation

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Message-ID: <AANLkTinW-nQV4tL-_PicOb-N6imv3gtWuG-J69-6VUQd@mail.gmail.com>
Date:	Tue, 1 Mar 2011 14:41:55 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Reverting NUMA-affine page table allocation

On Sat, Feb 26, 2011 at 6:37 AM, Tejun Heo <tj@...nel.org> wrote:
> Hello,
>
> I've been looking through NUMA-affine page table allocation code and
> the proposed changes, and there currently are the a couple of
> problems.
>
> 1. Holes or misaligned nodes will force use of smaller sized mappings.
>   Patches to fix the problem have been posted by Yinghai[1].

	git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-2.6-yinghai.git
memblock

>
> 2. find_early_table_space() always calculates the amount of the needed
>   space from 0 to the specified @end.  As nodes are registered, each
>   node would try to allocate accumulative amount of space for page
>   table.  This probably wouldn't cause any actual problem (may affect
>   emulated configurations a bit tho).

interesting.

Yinghai
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