linux-kernel - Re: /proc/vmcore mmap() failure issue

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Date:	Wed, 13 Nov 2013 14:44:45 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	Baoquan He <bhe@...hat.com>, WANG Chao <chaowang@...hat.com>,
	Dave Young <dyoung@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: /proc/vmcore mmap() failure issue

On 11/13/2013 02:41 PM, Vivek Goyal wrote:
> 
> Hi Peter,
> 
> I noticed we seem to be trimming away partial pages in memblock.
> 
> memblock_x86_fill() {
> 	/* throw away partial pages */
>         memblock_trim_memory(PAGE_SIZE);
> }
> 
> But not in e820 hence they show up in /proc/iomem.
> 

Why does /proc/iomem matter?

> How about something along the lines as below patch. This fixes my
> /proc/vmcore mmap() issue.

I'm not sure if what you're seeing is something that is better handled
in userspace.

	-hpa


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