linux-kernel - Re: [tip:sched/core] sched/numa: Move task_numa_free() to __put_task

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Message-ID: <20140407081644.GD11096@twins.programming.kicks-ass.net>
Date:	Mon, 7 Apr 2014 10:16:44 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	Sasha Levin <sasha.levin@...cle.com>, mingo@...nel.org,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, mgorman@...e.com,
	akpm@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org, Dave Jones <davej@...hat.com>
Subject: Re: [tip:sched/core] sched/numa: Move task_numa_free() to
 __put_task_struct()

On Mon, Apr 07, 2014 at 09:30:30AM +0200, Mike Galbraith wrote:
> -	double_lock(&my_grp->lock, &grp->lock);
> +	BUG_ON(irqs_disabled());
> +	double_lock_irq(&my_grp->lock, &grp->lock);

So either make this:

	local_irq_disable();
	double_lock();

or

>  
>  	for (i = 0; i < NR_NUMA_HINT_FAULT_STATS * nr_node_ids; i++) {
>  		my_grp->faults[i] -= p->numa_faults_memory[i];
> @@ -1692,6 +1693,7 @@ static void task_numa_group(struct task_
>  
>  	spin_unlock(&my_grp->lock);
>  	spin_unlock(&grp->lock);
> +	local_irq_enable();

use:
	spin_unlock()
	spin_unlock_irq()

or so, but this imbalance is making my itch :-)


>  
>  	rcu_assign_pointer(p->numa_group, grp);
>  
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