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

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Message-ID: <20150729113249.GL2673@pathway.suse.cz>
Date:	Wed, 29 Jul 2015 13:32:49 +0200
From:	Petr Mladek <pmladek@...e.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Borislav Petkov <bp@...e.de>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>,
	live-patching@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 07/14] mm/huge_page: Convert khugepaged() into
 kthread worker API

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
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