linux-kernel - Re: [PATCH 02/18] sched: Track NUMA hinting faults on per-node basis

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Message-ID: <20130731075451.GE2296@suse.de>
Date:	Wed, 31 Jul 2013 08:54:51 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	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 02/18] sched: Track NUMA hinting faults on per-node basis

On Mon, Jul 29, 2013 at 12:10:59PM +0200, Peter Zijlstra wrote:
> On Mon, Jul 15, 2013 at 04:20:04PM +0100, Mel Gorman wrote:
> > +++ b/kernel/sched/fair.c
> > @@ -815,7 +815,14 @@ void task_numa_fault(int node, int pages, bool migrated)
> >  	if (!sched_feat_numa(NUMA))
> >  		return;
> >  
> > -	/* FIXME: Allocate task-specific structure for placement policy here */
> > +	/* Allocate buffer to track faults on a per-node basis */
> > +	if (unlikely(!p->numa_faults)) {
> > +		int size = sizeof(*p->numa_faults) * nr_node_ids;
> > +
> > +		p->numa_faults = kzalloc(size, GFP_KERNEL);
> 
> We should probably stick a __GFP_NOWARN in there.
> 

Yes.

-- 
Mel Gorman
SUSE Labs
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