linux-kernel - Re: [PATCH 08/18] sched: Reschedule task on preferred NUMA node once selected

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Date:	Wed, 31 Jul 2013 10:07:27 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	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 08/18] sched: Reschedule task on preferred NUMA node once
 selected

On Wed, Jul 17, 2013 at 09:31:05AM +0800, Hillf Danton wrote:
> On Mon, Jul 15, 2013 at 11:20 PM, Mel Gorman <mgorman@...e.de> 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);
> > +
> > +       rcu_read_lock();
> > +       for_each_cpu(i, cpumask_of_node(nid)) {
> 
> Check allowed CPUs first if task is given?
> 

If the task is not allowed to run on the CPUs for that node then how
were the NUMA hinting faults recorded?

-- 
Mel Gorman
SUSE Labs
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