Re: [RFC PATCH 07/14] mm/huge_page: Convert khugepaged() into kthread worker API

[Petr Mladek <pmladek-IBi9RG/b67k@public.gmane.org>]

On Tue 2015-07-28 13:36:35, Tejun Heo wrote:
> Hello,
> 
> On Tue, Jul 28, 2015 at 04:39:24PM +0200, Petr Mladek wrote:
> > -static void khugepaged_wait_work(void)
> > +static void khugepaged_wait_func(struct kthread_work *dummy)
> >  {
> >  	if (khugepaged_has_work()) {
> >  		if (!khugepaged_scan_sleep_millisecs)
> > -			return;
> > +			goto out;
> >  
> >  		wait_event_freezable_timeout(khugepaged_wait,
> > -					     kthread_should_stop(),
> > +					     !khugepaged_enabled(),
> >  			msecs_to_jiffies(khugepaged_scan_sleep_millisecs));
> > -		return;
> > +		goto out;
> >  	}
> >  
> >  	if (khugepaged_enabled())
> >  		wait_event_freezable(khugepaged_wait, khugepaged_wait_event());
> > +
> > +out:
> > +	if (khugepaged_enabled())
> > +		queue_kthread_work(&khugepaged_worker,
> > +				   &khugepaged_do_scan_work);
> >  }
> 
> There gotta be a better way to do this.  It's outright weird to
> convert it over to work item based interface and then handle idle
> periods by injecting wait work items.  If there's an external event
> which wakes up the worker, convert that to a queueing event.  If it's
> a timed event, implement a delayed work and queue that with delay.

I am going to give it a try.

Best Regards,
Petr