linux-kernel - Re: [Xen-devel] [PATCH] mmap_vmcore: skip non-ram pages reported by hypervisors

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Message-ID: <20140709101215.GA31182@aepfle.de>
Date:	Wed, 9 Jul 2014 12:12:15 +0200
From:	Olaf Hering <olaf@...fle.de>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, xen-devel@...ts.xenproject.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH] mmap_vmcore: skip non-ram pages reported by
 hypervisors

On Wed, Jul 09, Vitaly Kuznetsov wrote:

> > Also I am wondering why it was not done as part of copy_oldmem_page()
> > so that respective arch could hide all the details.
> Afaiac that wouldn't solve the mmap issue I'm trying to address but we
> can ask Olaf why he preferred pfn_is_ram() path.

Every copy_oldmem_page would need to know about the pfn_is_ram function,
so I think its better to keep that part of the code private to
fs/proc/vmcore.c

Perhaps pfn_is_ram could be named pfn_is_backed_by_ram, but the comments
make it clear what the function does.


Olaf
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