linux-kernel - Re: [PATCH v2] Hibernate: check unsafe page should not in e820 reserved region

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Date:	Thu, 7 Aug 2014 18:17:34 +0800
From:	joeyli <jlee@...e.com>
To:	Pavel Machek <pavel@....cz>
Cc:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Takashi Iwai <tiwai@...e.de>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Hibernate: check unsafe page should not in e820
 reserved region

On Thu, Aug 07, 2014 at 11:39:57AM +0200, Pavel Machek wrote:
> > > Actually, if you are doing such a check... it makes sense to check for
> > > _all_ the regions, nosave or not. If e820 map changed at all, it is
> > > not safe to resume.
> > > 									Pavel
> > 
> > Currently nosave region only called register by e820 code, so hibernate's nosave region included e820
> > reserved, ACPI data and ACPI NVS region.
> > 
> > I thought hashing the start/end pfn of above regions is enough.
> 
> If ammount of memory changed, for example, it is unsafe to
> resume. So if you are doing the check, anyway, please hash
> whole e820 table.
> 						Pavel

There already have num_physpages in header for check the total physical page number.


Regards
Joey Lee
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