linux-kernel - Re: [PATCH] PM / hibernate: Introduce snapshot test mode for hibernation

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Message-ID: <20160713095005.GA27870@amd>
Date:	Wed, 13 Jul 2016 11:50:05 +0200
From:	Pavel Machek <pavel@....cz>
To:	Chen Yu <yu.c.chen@...el.com>
Cc:	linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / hibernate: Introduce snapshot test mode for
 hibernation

On Thu 2016-07-07 14:40:58, Chen Yu wrote:
> This mode is to verify if the snapshot data written to
> swap device can be successfully restored to memory. It
> is useful to ease the debugging process on hibernation,
> since this mode can not only bypass the BIOSen/bootloader,
> but also the system re-initialization.
> 
> For example:
> $ sudo echo snapshot > /sys/power/disk
> $ sudo echo disk > /sys/power/state
> 
> /* manual resume.*/
> $ sudo echo 8:3 > /sys/power/resume

Your examples will not work, will they?

This is also quite tricky/dangerous. If you do this with filesystems
mounted R/W, it is "good bye, filesystems".

I guess updating documentation would be welcome from my side,
otherwise it should be ok.

Acked-by: Pavel Machek <pavel@....cz>

Best regards,
								Pavel

-- 
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