linux-kernel - Re: [PATCH v2 20/20] x86, mm, numa: Put pagetable on local node ram for 64bit

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Message-ID: <CAE9FiQXKxnx5kiuz6zfcfS4pKJJu6GOR6CWso-wKcZuHBaAzbQ@mail.gmail.com>
Date:	Sun, 10 Mar 2013 23:29:49 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Thomas Renninger <trenn@...e.de>,
	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Jacob Shin <jacob.shin@....com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v2 20/20] x86, mm, numa: Put pagetable on local node ram
 for 64bit

On Sun, Mar 10, 2013 at 10:49 PM, Tang Chen <tangchen@...fujitsu.com> wrote:
> On 03/10/2013 02:44 PM, Yinghai Lu wrote:
>>
>> Calling init_mem_mapping in early_initmem_init for every node.
>> alloc_low_pages will alloc page table in following order:
>>         BRK, local node, low range
>> So page table will be on low range or local nodes.
...
> IIUC, we call init_mem_mapping() for each node ranges. In the first time,
>         local_max_pfn_mapped = begin >> PAGE_SHIFT;
>         local_min_pfn_mapped = real_end >> PAGE_SHIFT;
> which means
>         local_min_pfn_mapped >= local_max_pfn_mapped
> right ?
>
> So, the first page allocated by alloc_low_pages() is not on local node,
> right ?

It is from BRK with kernel code.

> Furthermore, the first page of pagetable is not on local node, right ?

It is in BRK for node with start = 0.

Other node, it is from low_range aka node with start = 0.

Thanks

Yinghai
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