linux-kernel - Re: [PATCH 1/1] hung_task: Change hung_task.c to use for_each_process

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Message-ID: <20150317171832.GE6831@atomlin.usersys.redhat.com>
Date:	Tue, 17 Mar 2015 17:18:32 +0000
From:	Aaron Tomlin <atomlin@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	akpm@...ux-foundation.org, rientjes@...gle.com,
	dwysocha@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] hung_task: Change hung_task.c to use
 for_each_process_thread()

On Tue 2015-03-17 18:09 +0100, Oleg Nesterov wrote:
> On 03/17, Aaron Tomlin wrote:
> >
> > --- a/kernel/hung_task.c
> > +++ b/kernel/hung_task.c
> > @@ -169,7 +169,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
> >  		return;
> >  
> >  	rcu_read_lock();
> > -	do_each_thread(g, t) {
> > +	for_each_process_thread(g, t) {
> >  		if (!max_count--)
> >  			goto unlock;
> >  		if (!--batch_count) {
> > @@ -180,7 +180,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
> >  		/* use "==" to skip the TASK_KILLABLE tasks waiting on NFS */
> >  		if (t->state == TASK_UNINTERRUPTIBLE)
> >  			check_hung_task(t, timeout);
> > -	} while_each_thread(g, t);
> > +	}
> 
> 
> Acked-by: Oleg Nesterov <oleg@...hat.com>
> 
> 
> 
> Perhaps it also makes sense to improve this rcu_lock_break a bit...
> For example, if 't' is dead but 'g' is alive we can continue the
> "for_each_process" part of this double loop. And if 't' is still
> alive then we can find the new leader and continue...

OK - I'll incorporate that in a separate patch.

Thanks,

-- 
Aaron Tomlin
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