linux-kernel - Re: [2.6.21.1] resume doesn't run suspended kernel?

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Date:	Mon, 28 May 2007 09:21:10 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Pavel Machek <pavel@....cz>
CC:	Bill Davidsen <davidsen@....com>,
	Linux Kernel M/L <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.21.1] resume doesn't run suspended kernel?

Bill Davidsen wrote:
> Pavel Machek wrote:
>> On Sat 2007-05-26 18:42:37, Bill Davidsen wrote:
>>  
>>> I was testing susp2disk in 2.6.21.1 under FC6, to support reliable 
>>> computing environment (RCE) needs. The idea is that if power fails, 
>>> after some short time on UPS the system does susp2disk with a time 
>>> set, and boots back every so often to see if power is stable.
>>>
>>> No, I don't want susp2mem until I debug it, console come up in 
>>> useless mode, console as kalidescope is not what I need.
>>>
>>> Anyway, I pulled the plug on the UPS, and the system shut down. But 
>>> when it powered up, it booted the default kernel rather than the 
>>> test kernel, decided that it couldn't resume, and then did a cold boot.
>>>
>>> I can bypass this by making the debug kernel the default, but WHY?     
>>
>> HELL YES :-). We do not save kernel code into image.
>>
>>   
> That's clear, I'll have to use xen or kvm or similar which restores 
> the system as suspended. Thanks for the clarification of the limitations.
>
Sorry, I wrote that late at night and quickly. I should have said 
"design decision" rather than "limitation," For systems which don't do 
multiple kernels it's not an issue.

I certainly would not have made the same decision, but I didn't write 
the code. It seems more robust to save everything than to try to 
identify what has and hasn't changed in a modular kernel.

-- 
Bill Davidsen <davidsen@....com>
  "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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