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

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Message-ID: <20130729101059.GC3008@twins.programming.kicks-ass.net>
Date:	Mon, 29 Jul 2013 12:10:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
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 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.

> +		if (!p->numa_faults)
> +			return;
> +	}
>  
>  	/*
>  	 * If pages are properly placed (did not migrate) then scan slower.
--
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