linux-kernel - Re: [PATCH 6/8] sched: Reschedule task on preferred NUMA node once selected

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Date:	Fri, 28 Jun 2013 14:54:54 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/8] sched: Reschedule task on preferred NUMA node once
 selected

On Thu, Jun 27, 2013 at 04:54:58PM +0200, Peter Zijlstra wrote:
> On Wed, Jun 26, 2013 at 03:38:05PM +0100, Mel Gorman wrote:
> > +static int
> > +find_idlest_cpu_node(int this_cpu, int nid)
> > +{
> > +	unsigned long load, min_load = ULONG_MAX;
> > +	int i, idlest_cpu = this_cpu;
> > +
> > +	BUG_ON(cpu_to_node(this_cpu) == nid);
> > +
> > +	for_each_cpu(i, cpumask_of_node(nid)) {
> > +		load = weighted_cpuload(i);
> > +
> > +		if (load < min_load) {
> > +			struct task_struct *p;
> > +
> > +			/* Do not preempt a task running on its preferred node */
> > +			struct rq *rq = cpu_rq(i);
> > +			local_irq_disable();
> > +			raw_spin_lock(&rq->lock);
> 
> raw_spin_lock_irq() ?
> 

/me slaps self

Fixed. Thanks.

> > +			p = rq->curr;
> > +			if (p->numa_preferred_nid != nid) {
> > +				min_load = load;
> > +				idlest_cpu = i;
> > +			}
> > +			raw_spin_unlock(&rq->lock);
> > +			local_irq_disable();
> > +		}
> > +	}
> > +
> > +	return idlest_cpu;
> > +}

-- 
Mel Gorman
SUSE Labs
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