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

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Message-ID: <45F46D33.1050808@redhat.com>
Date:	Sun, 11 Mar 2007 21:57:23 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Thomas Meyer <thomas@...3r.de>
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

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


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