linux-kernel - Re: mem_map array on NUMA

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Message-ID: <alpine.DEB.2.00.1011121033340.5830@chino.kir.corp.google.com>
Date:	Fri, 12 Nov 2010 10:36:14 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Artur Baruchi <mail.baruchi@...il.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: mem_map array on NUMA

On Fri, 12 Nov 2010, Artur Baruchi wrote:

> Hi David.
> 
> Thanks for your answer.
> 
> Basically, I would like to get information about memory pages, without
> "worry" about which zone its owned. I tried to use the code you've send, but
> some macros are not beeing exported by the Kernel (I cannot use it in
> drivers/modules). Im facing the follow errors:
> 
> *WARNING: "next_zone" [/root/DRIVER/xxxxxxxx.ko] undefined!
> WARNING: "first_online_pgdat" [/root/DRIVER/**xxxxxxxx.ko**] undefined!*
> 
> Do you have any idea about how can I handle this error?
> 

For your use-case, you can simply iterate through each pfn without 
worrying about their zones, something like:

	unsigned long pfn;

	for (pfn = 0; pfn < max_pfn; pfn++) {
		struct page *page;

		if (!pfn_valid(pfn))
			continue;
		page = pfn_to_page(pfn);
		/* do something with page */
	}		

> Thanks in advance.
> 
> Att.
> Artur Baruchi
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