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

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Date:	Sun, 11 Mar 2007 20:04:02 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Thomas Meyer <thomas@...3r.de>, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>
Subject: Re: SwSusp to disk doesn't work - Try 2

Rafael J. Wysocki napsal(a):
> On Sunday, 11 March 2007 19:08, Thomas Meyer wrote:
>> Suspend to disk doesn't work on my laptop.
>>
>> The suspend seems to hang while enabling the non-boot cpus again.
>>
>> with platform = "test" and state = "disk" i get this:

>> Enabling non-boot CPUs ...
...
> 
> Could you please put some printk()s in kernel/cpu.c:_cpu_up() to see where
> it gets stuck?  I bet one of the notifiers goes to sleep (cpufreq, maybe).

Hi,
I see the same problem - 2.6.21-rc3 with NO_HZ set (tickless), 
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)


Milan


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