linux-kernel - Re: Documentation on /sys/power/resume

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Message-Id: <200705271253.03396.rjw@sisk.pl>
Date:	Sun, 27 May 2007 12:53:02 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Bill Davidsen <davidsen@....com>
Cc:	Linux Kernel M/L <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: Documentation on /sys/power/resume

Hi,

On Sunday, 27 May 2007 01:51, Bill Davidsen wrote:
> Not in the ABI doc, is there and doc at all, and if not could someone 
> who knows where it's used might give me a hint, as a quick look didn't 
> bring enlightenment. Or is it a future hook which doesn't work yet?

That's something that in theory may allow you to resume the system from
and initrd script.

Basically, you write your resume device's major and minor numbers
into it as the "MAJ:MIN" string (eg. "8:3" for /dev/sda3 on my box) and the
kernel will try to read the image from this device and restore it.

It only works with partitions and the use of it us discouraged, so it's
deliberately undocumented.

Greetings,
Rafael


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