linux-kernel - Re: SwSusp to disk doesn't work

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Date:	Sun, 11 Mar 2007 22:02:55 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	Milan Broz <mbroz@...hat.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: SwSusp to disk doesn't work - Try 2

Milan Broz schrieb:
> Thomas Meyer napsal(a):
>   
>> Rafael J. Wysocki schrieb:
>>     
>>> On Sunday, 11 March 2007 21:23, Milan Broz wrote:
>>>   
>>>       
>>>> Rafael J. Wysocki:
>>>>     
>>>>         
>>>>> Ah, NO_HZ.  Thomas Gleixner's address added to the Cc list.
>>>>>
>>>>>       
>>>>>           
>>>>>> short printk trace 
>>>>>>
>>>>>> enable_nonboot_cpus
>>>>>>  _cpu_up
>>>>>>   raw_notifier_callchain (CPU_UP_PREPARE)
>>>>>>     ...
>>>>>>     update_sched_domains
>>>>>>      detach_destroy_domains
>>>>>>        [waits here] --> synchronize_sched (==synchronize_rcu)
>>>>>>         
>>>>>>             
>>>>> Well, I think the call to wait_for_completion() does not return, probably
>>>>> because the task supposed to complete the completion is frozen at this
>>>>> point.  Can you please try to confirm that it gets stuck on
>>>>> wait_for_completion() in synchronize_rcu()?
>>>>>       
>>>>>           
>>>> Yes, it's in wait_for_completion() in synchronize_rcu().
>>>> As noted in some previous mail, it will wake up after
>>>> event - key press etc.
>>>>
>>>> Patch in http://lkml.org/lkml/2007/3/7/255 solves different problem.
>>>> I added it to my quilt and applied anyway -> no change.
>>>>     
>>>>         
>>> Does the problem go away if NO_HZ is unset?
>>>   
>>>       
>> i tried to boot with nohz=off, but the problem did persist.
>>     
>
> Hmmmm, both variants (nohz=off or recompiled kernel without NO_HZ) works for me.
>
> Milan
>   

I got a working config:

Without hrtimers and without nohz it is working!

With hrtimers and without nohz it is not working
With hrtimers and with nohz it is not working

Now i want to test: without hrtimers and with nohz.





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