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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH -mm] swsusp: Freeze filesystems during suspend (rev. 2)
Date: Wed, 1 Nov 2006 21:27:17 +0100
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Cc: Pavel Machek <pavel@ucw.cz>, LKML <linux-kernel@vger.kernel.org>,
       Nigel Cunningham <ncunningham@linuxmail.org>,
       Christoph Hellwig <hch@infradead.org>
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On Wednesday, 1 November 2006 20:45, Andrew Morton wrote:
> On Wed, 1 Nov 2006 18:53:07 +0100
> "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
> 
> > +void thaw_processes(void)
> > +{
> > +	printk("Restarting tasks ... ");
> > +	__thaw_tasks(FREEZER_KERNEL_THREADS);
> > +	thaw_filesystems();
> > +	__thaw_tasks(FREEZER_USER_SPACE);
> > +	schedule();
> > +	printk("done.\n");
> > +}
> >  
> > -	read_unlock(&tasklist_lock);
> > +void thaw_kernel_threads(void)
> > +{
> > +	printk("Restarting kernel threads ... ");
> > +	__thaw_tasks(FREEZER_KERNEL_THREADS);
> >  	schedule();
> >  	printk("done.\n");
> >  }
> 
> what do these random-looking schedule()s do??

My understanding is that they allow the thawed tasks to actually exit
the refrigerator, because __thaw_tasks() only changes their states.