linux-kernel - Re: Back to the future.

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Message-ID: <Pine.LNX.4.63.0704261545100.9674@qynat.qvtvafvgr.pbz>
Date:	Thu, 26 Apr 2007 15:49:51 -0700 (PDT)
From:	David Lang <david.lang@...italinsight.com>
To:	Pavel Machek <pavel@....cz>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pekka Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Back to the future.

On Fri, 27 Apr 2007, Pavel Machek wrote:

> Hi!
>
>>> This is basically the loop above, made complex by the fact that we do
>>> not want to have separate partition for snapshot; we just want to
>>> reuse free space in swap partition.
>>
>> with the size of drives today is it really that bad to require a seperate
>> partition for this?
>
> Yes. You want uswsusp to work in situations where swsusp worked.
>
>> I also don't like the idea of storing this in the swap partition for a
>> couple of reasons.
>>
>> 1. on many modern linux systems the swap partition is not large enough.
>>
>> for example, on my boxes with 16G or ram I only allocate 2G of swap
>> space
>
> WTF? So allocate larger swap partition. You just told me disks are big
> enough.

swap partitions are limited to 2G (or at least they were a couple of months ago 
when I last checked). I also don't want to run the risk of having a box try to 
_use_ 16G worth of swap. I'd rather have the box hit OOM first.

>> 2. it's too easy for other things to stomp on your swap partition.
>>
>>   for example: booting from a live CD that finds and uses swap
>> partitions
>
> That's a feature. If you are booting from live CD, you _want_ to erase
> any hibernation image.

why?

it's been stated that doing a std and booting another OS (including windows) is 
a valid and common useage. saying that if you boot another OS you trash your 
suspended image doesn't sound reasonable.

David Lang
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