linux-kernel - Re: [linux-pm] what the patches do Re: [RFC 10/15] PM / Hibernate: user, implement user

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Message-ID: <20100402063644.GA14941@atrey.karlin.mff.cuni.cz>
Date:	Fri, 2 Apr 2010 08:36:45 +0200
From:	Pavel Machek <pavel@....cz>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	Jiri Slaby <jslaby@...e.cz>, jirislaby@...il.com,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] what the patches do Re: [RFC 10/15] PM / Hibernate:
	user, implement user_ops reader

Hi!

>>>> So what's your long term plan then?
>>>
>>> First, improve the in-kernel thing, second, switch people to it, _then_ remove
>>> the s2disk interface (after we're reasonably sure it's not used by any major
>>> distro) and _finally_ simplify things after it's been removed.
>>
>> I'd really prefer to keep s2disk interface. It allows advanced stuff
>> like internet suspend resume (yep someone is doing it), crazy stuff
>> like multiple resumes from same image for fast booting (yep, some
>> embedded people are doing that) and might-be-useful stuff like
>> s2both...
>
> Neither of those are impossible with in-kernel code, so I'd argue that  
> there's no need to keep the s2disk interface long-term. Userspace  

I disagree.

> helpers might be necessary for the first one (to manage the network  
> interface), but I already have multiple-resumes-from-the-same-image  
> support in TuxOnice (and more 'crazy stuff' like support for resuming a  
> different image after writing one - that can be used to switch to an  
> initramfs containing the binaries needed to power down a UPS).

The fact that it can be done in kernel -- anything can -- but whether
it should. I'd very much like to keep the 'crazy stuff' in userspace.
									Pavel

-- 
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